package command

import (
	"context"
	"crypto/sha256"
	"encoding/base64"
	"encoding/hex"
	"fmt"
	"go.uber.org/atomic"
	"io"
	"io/ioutil"
	"net"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"sync"
	"time"

	monitoring "cloud.google.com/go/monitoring/apiv3"
	"github.com/armon/go-metrics"
	"github.com/armon/go-metrics/circonus"
	"github.com/armon/go-metrics/datadog"
	"github.com/armon/go-metrics/prometheus"
	stackdriver "github.com/google/go-metrics-stackdriver"
	"github.com/hashicorp/errwrap"
	log "github.com/hashicorp/go-hclog"
	"github.com/hashicorp/go-multierror"
	"github.com/hashicorp/go-sockaddr"
	"github.com/hashicorp/vault/audit"
	"github.com/hashicorp/vault/command/server"
	serverseal "github.com/hashicorp/vault/command/server/seal"
	"github.com/hashicorp/vault/helper/builtinplugins"
	gatedwriter "github.com/hashicorp/vault/helper/gated-writer"
	"github.com/hashicorp/vault/helper/metricsutil"
	"github.com/hashicorp/vault/helper/namespace"
	"github.com/hashicorp/vault/helper/reload"
	vaulthttp "github.com/hashicorp/vault/http"
	"github.com/hashicorp/vault/sdk/helper/jsonutil"
	"github.com/hashicorp/vault/sdk/helper/logging"
	"github.com/hashicorp/vault/sdk/helper/mlock"
	"github.com/hashicorp/vault/sdk/helper/parseutil"
	"github.com/hashicorp/vault/sdk/helper/useragent"
	"github.com/hashicorp/vault/sdk/logical"
	"github.com/hashicorp/vault/sdk/physical"
	"github.com/hashicorp/vault/sdk/version"
	"github.com/hashicorp/vault/vault"
	vaultseal "github.com/hashicorp/vault/vault/seal"
	shamirseal "github.com/hashicorp/vault/vault/seal/shamir"
	"github.com/mitchellh/cli"
	"github.com/mitchellh/go-testing-interface"
	"github.com/posener/complete"
	"golang.org/x/net/http/httpproxy"
	"google.golang.org/api/option"
	"google.golang.org/grpc/grpclog"
)

var _ cli.Command = (*ServerCommand)(nil)
var _ cli.CommandAutocomplete = (*ServerCommand)(nil)

var memProfilerEnabled = false

var enableFourClusterDev = func(c *ServerCommand, base *vault.CoreConfig, info map[string]string, infoKeys []string, devListenAddress, tempDir string) int {
	c.logger.Error("-dev-four-cluster only supported in enterprise Vault")
	return 1
}

const storageMigrationLock = "core/migration"

type ServerCommand struct {
	*BaseCommand

	AuditBackends      map[string]audit.Factory
	CredentialBackends map[string]logical.Factory
	LogicalBackends    map[string]logical.Factory
	PhysicalBackends   map[string]physical.Factory

	ShutdownCh chan struct{}
	SighupCh   chan struct{}
	SigUSR2Ch  chan struct{}

	WaitGroup *sync.WaitGroup

	logWriter io.Writer
	logGate   *gatedwriter.Writer
	logger    log.Logger

	cleanupGuard sync.Once

	reloadFuncsLock *sync.RWMutex
	reloadFuncs     *map[string][]reload.ReloadFunc
	startedCh       chan (struct{}) // for tests
	reloadedCh      chan (struct{}) // for tests

	// new stuff
	flagConfigs          []string
	flagLogLevel         string
	flagLogFormat        string
	flagRecovery         bool
	flagDev              bool
	flagDevRootTokenID   string
	flagDevListenAddr    string
	flagDevNoStoreToken  bool
	flagDevPluginDir     string
	flagDevPluginInit    bool
	flagDevHA            bool
	flagDevLatency       int
	flagDevLatencyJitter int
	flagDevLeasedKV      bool
	flagDevKVV1          bool
	flagDevSkipInit      bool
	flagDevThreeNode     bool
	flagDevFourCluster   bool
	flagDevTransactional bool
	flagDevAutoSeal      bool
	flagTestVerifyOnly   bool
	flagCombineLogs      bool
	flagTestServerConfig bool
	flagDevConsul        bool
}

type ServerListener struct {
	net.Listener
	config                       map[string]interface{}
	maxRequestSize               int64
	maxRequestDuration           time.Duration
	unauthenticatedMetricsAccess bool
}

func (c *ServerCommand) Synopsis() string {
	return "Start a Vault server"
}

func (c *ServerCommand) Help() string {
	helpText := `
Usage: vault server [options]

  This command starts a Vault server that responds to API requests. By default,
  Vault will start in a "sealed" state. The Vault cluster must be initialized
  before use, usually by the "vault operator init" command. Each Vault server must
  also be unsealed using the "vault operator unseal" command or the API before the
  server can respond to requests.

  Start a server with a configuration file:

      $ vault server -config=/etc/vault/config.hcl

  Run in "dev" mode:

      $ vault server -dev -dev-root-token-id="root"

  For a full list of examples, please see the documentation.

` + c.Flags().Help()
	return strings.TrimSpace(helpText)
}

func (c *ServerCommand) Flags() *FlagSets {
	set := c.flagSet(FlagSetHTTP)

	f := set.NewFlagSet("Command Options")

	f.StringSliceVar(&StringSliceVar{
		Name:   "config",
		Target: &c.flagConfigs,
		Completion: complete.PredictOr(
			complete.PredictFiles("*.hcl"),
			complete.PredictFiles("*.json"),
			complete.PredictDirs("*"),
		),
		Usage: "Path to a configuration file or directory of configuration " +
			"files. This flag can be specified multiple times to load multiple " +
			"configurations. If the path is a directory, all files which end in " +
			".hcl or .json are loaded.",
	})

	f.StringVar(&StringVar{
		Name:       "log-level",
		Target:     &c.flagLogLevel,
		Default:    notSetValue,
		EnvVar:     "VAULT_LOG_LEVEL",
		Completion: complete.PredictSet("trace", "debug", "info", "warn", "err"),
		Usage: "Log verbosity level. Supported values (in order of detail) are " +
			"\"trace\", \"debug\", \"info\", \"warn\", and \"err\".",
	})

	f.StringVar(&StringVar{
		Name:    "log-format",
		Target:  &c.flagLogFormat,
		Default: notSetValue,
		// EnvVar can't be just "VAULT_LOG_FORMAT", because more than one env var name is supported
		// for backwards compatibility reasons.
		// See github.com/hashicorp/vault/sdk/helper/logging.ParseEnvLogFormat()
		Completion: complete.PredictSet("standard", "json"),
		Usage:      `Log format. Supported values are "standard" and "json".`,
	})

	f.BoolVar(&BoolVar{
		Name:   "recovery",
		Target: &c.flagRecovery,
		Usage: "Enable recovery mode. In this mode, Vault is used to perform recovery actions." +
			"Using a recovery operation token, \"sys/raw\" API can be used to manipulate the storage.",
	})

	f = set.NewFlagSet("Dev Options")

	f.BoolVar(&BoolVar{
		Name:   "dev",
		Target: &c.flagDev,
		Usage: "Enable development mode. In this mode, Vault runs in-memory and " +
			"starts unsealed. As the name implies, do not run \"dev\" mode in " +
			"production.",
	})

	f.StringVar(&StringVar{
		Name:    "dev-root-token-id",
		Target:  &c.flagDevRootTokenID,
		Default: "",
		EnvVar:  "VAULT_DEV_ROOT_TOKEN_ID",
		Usage: "Initial root token. This only applies when running in \"dev\" " +
			"mode.",
	})

	f.StringVar(&StringVar{
		Name:    "dev-listen-address",
		Target:  &c.flagDevListenAddr,
		Default: "127.0.0.1:8200",
		EnvVar:  "VAULT_DEV_LISTEN_ADDRESS",
		Usage:   "Address to bind to in \"dev\" mode.",
	})
	f.BoolVar(&BoolVar{
		Name:    "dev-no-store-token",
		Target:  &c.flagDevNoStoreToken,
		Default: false,
		Usage: "Do not persist the dev root token to the token helper " +
			"(usually the local filesystem) for use in future requests. " +
			"The token will only be displayed in the command output.",
	})

	// Internal-only flags to follow.
	//
	// Why hello there little source code reader! Welcome to the Vault source
	// code. The remaining options are intentionally undocumented and come with
	// no warranty or backwards-compatibility promise. Do not use these flags
	// in production. Do not build automation using these flags. Unless you are
	// developing against Vault, you should not need any of these flags.

	f.StringVar(&StringVar{
		Name:       "dev-plugin-dir",
		Target:     &c.flagDevPluginDir,
		Default:    "",
		Completion: complete.PredictDirs("*"),
		Hidden:     true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-plugin-init",
		Target:  &c.flagDevPluginInit,
		Default: true,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-ha",
		Target:  &c.flagDevHA,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-transactional",
		Target:  &c.flagDevTransactional,
		Default: false,
		Hidden:  true,
	})

	f.IntVar(&IntVar{
		Name:   "dev-latency",
		Target: &c.flagDevLatency,
		Hidden: true,
	})

	f.IntVar(&IntVar{
		Name:   "dev-latency-jitter",
		Target: &c.flagDevLatencyJitter,
		Hidden: true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-leased-kv",
		Target:  &c.flagDevLeasedKV,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-kv-v1",
		Target:  &c.flagDevKVV1,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-auto-seal",
		Target:  &c.flagDevAutoSeal,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-skip-init",
		Target:  &c.flagDevSkipInit,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-three-node",
		Target:  &c.flagDevThreeNode,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-four-cluster",
		Target:  &c.flagDevFourCluster,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "dev-consul",
		Target:  &c.flagDevConsul,
		Default: false,
		Hidden:  true,
	})

	// TODO: should the below flags be public?
	f.BoolVar(&BoolVar{
		Name:    "combine-logs",
		Target:  &c.flagCombineLogs,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "test-verify-only",
		Target:  &c.flagTestVerifyOnly,
		Default: false,
		Hidden:  true,
	})

	f.BoolVar(&BoolVar{
		Name:    "test-server-config",
		Target:  &c.flagTestServerConfig,
		Default: false,
		Hidden:  true,
	})

	// End internal-only flags.

	return set
}

func (c *ServerCommand) AutocompleteArgs() complete.Predictor {
	return complete.PredictNothing
}

func (c *ServerCommand) AutocompleteFlags() complete.Flags {
	return c.Flags().Completions()
}

func (c *ServerCommand) parseConfig() (*server.Config, error) {
	// Load the configuration
	var config *server.Config
	for _, path := range c.flagConfigs {
		current, err := server.LoadConfig(path)
		if err != nil {
			return nil, errwrap.Wrapf(fmt.Sprintf("error loading configuration from %s: {{err}}", path), err)
		}

		if config == nil {
			config = current
		} else {
			config = config.Merge(current)
		}
	}
	return config, nil
}

func (c *ServerCommand) runRecoveryMode() int {
	config, err := c.parseConfig()
	if err != nil {
		c.UI.Error(err.Error())
		return 1
	}

	// Ensure at least one config was found.
	if config == nil {
		c.UI.Output(wrapAtLength(
			"No configuration files found. Please provide configurations with the " +
				"-config flag. If you are supplying the path to a directory, please " +
				"ensure the directory contains files with the .hcl or .json " +
				"extension."))
		return 1
	}

	level, logLevelString, logLevelWasNotSet, logFormat, err := c.processLogLevelAndFormat(config)
	if err != nil {
		c.UI.Error(err.Error())
		return 1
	}

	c.logger = log.New(&log.LoggerOptions{
		Output: c.logWriter,
		Level:  level,
		// Note that if logFormat is either unspecified or standard, then
		// the resulting logger's format will be standard.
		JSONFormat: logFormat == logging.JSONFormat,
	})

	logLevelStr, err := c.adjustLogLevel(config, logLevelWasNotSet)
	if err != nil {
		c.UI.Error(err.Error())
		return 1
	}
	if logLevelStr != "" {
		logLevelString = logLevelStr
	}

	// create GRPC logger
	namedGRPCLogFaker := c.logger.Named("grpclogfaker")
	grpclog.SetLogger(&grpclogFaker{
		logger: namedGRPCLogFaker,
		log:    os.Getenv("VAULT_GRPC_LOGGING") != "",
	})

	if config.Storage == nil {
		c.UI.Output("A storage backend must be specified")
		return 1
	}

	if config.DefaultMaxRequestDuration != 0 {
		vault.DefaultMaxRequestDuration = config.DefaultMaxRequestDuration
	}

	proxyCfg := httpproxy.FromEnvironment()
	c.logger.Info("proxy environment", "http_proxy", proxyCfg.HTTPProxy,
		"https_proxy", proxyCfg.HTTPSProxy, "no_proxy", proxyCfg.NoProxy)

	// Initialize the storage backend
	factory, exists := c.PhysicalBackends[config.Storage.Type]
	if !exists {
		c.UI.Error(fmt.Sprintf("Unknown storage type %s", config.Storage.Type))
		return 1
	}
	if config.Storage.Type == "raft" {
		if envCA := os.Getenv("VAULT_CLUSTER_ADDR"); envCA != "" {
			config.ClusterAddr = envCA
		}

		if len(config.ClusterAddr) == 0 {
			c.UI.Error("Cluster address must be set when using raft storage")
			return 1
		}
	}

	namedStorageLogger := c.logger.Named("storage." + config.Storage.Type)
	backend, err := factory(config.Storage.Config, namedStorageLogger)
	if err != nil {
		c.UI.Error(fmt.Sprintf("Error initializing storage of type %s: %s", config.Storage.Type, err))
		return 1
	}

	infoKeys := make([]string, 0, 10)
	info := make(map[string]string)
	info["log level"] = logLevelString
	infoKeys = append(infoKeys, "log level")

	var barrierSeal vault.Seal
	var sealConfigError error

	if len(config.Seals) == 0 {
		config.Seals = append(config.Seals, &server.Seal{Type: vaultseal.Shamir})
	}

	if len(config.Seals) > 1 {
		c.UI.Error("Only one seal block is accepted in recovery mode")
		return 1
	}

	configSeal := config.Seals[0]
	sealType := vaultseal.Shamir
	if !configSeal.Disabled && os.Getenv("VAULT_SEAL_TYPE") != "" {
		sealType = os.Getenv("VAULT_SEAL_TYPE")
		configSeal.Type = sealType
	} else {
		sealType = configSeal.Type
	}

	var seal vault.Seal
	sealLogger := c.logger.Named(sealType)
	seal, sealConfigError = serverseal.ConfigureSeal(configSeal, &infoKeys, &info, sealLogger, vault.NewDefaultSeal(shamirseal.NewSeal(c.logger.Named("shamir"))))
	if sealConfigError != nil {
		if !errwrap.ContainsType(sealConfigError, new(logical.KeyNotFoundError)) {
			c.UI.Error(fmt.Sprintf(
				"Error parsing Seal configuration: %s", sealConfigError))
			return 1
		}
	}
	if seal == nil {
		c.UI.Error(fmt.Sprintf(
			"After configuring seal nil returned, seal type was %s", sealType))
		return 1
	}

	barrierSeal = seal

	// Ensure that the seal finalizer is called, even if using verify-only
	defer func() {
		err = seal.Finalize(context.Background())
		if err != nil {
			c.UI.Error(fmt.Sprintf("Error finalizing seals: %v", err))
		}
	}()

	coreConfig := &vault.CoreConfig{
		Physical:     backend,
		StorageType:  config.Storage.Type,
		Seal:         barrierSeal,
		Logger:       c.logger,
		DisableMlock: config.DisableMlock,
		RecoveryMode: c.flagRecovery,
		ClusterAddr:  config.ClusterAddr,
	}

	core, newCoreError := vault.NewCore(coreConfig)
	if newCoreError != nil {
		if vault.IsFatalError(newCoreError) {
			c.UI.Error(fmt.Sprintf("Error initializing core: %s", newCoreError))
			return 1
		}
	}

	if err := core.InitializeRecovery(context.Background()); err != nil {
		c.UI.Error(fmt.Sprintf("Error initializing core in recovery mode: %s", err))
		return 1
	}

	// Compile server information for output later
	infoKeys = append(infoKeys, "storage")
	info["storage"] = config.Storage.Type

	if coreConfig.ClusterAddr != "" {
		info["cluster address"] = coreConfig.ClusterAddr
		infoKeys = append(infoKeys, "cluster address")
	}

	// Initialize the listeners
	lns := make([]ServerListener, 0, len(config.Listeners))
	for _, lnConfig := range config.Listeners {
		ln, _, _, err := server.NewListener(lnConfig.Type, lnConfig.Config, c.logWriter, c.UI)
		if err != nil {
			c.UI.Error(fmt.Sprintf("Error initializing listener of type %s: %s", lnConfig.Type, err))
			return 1
		}

		lns = append(lns, ServerListener{
			Listener: ln,
			config:   lnConfig.Config,
		})
	}

	listenerCloseFunc := func() {
		for _, ln := range lns {
			ln.Listener.Close()
		}
	}

	defer c.cleanupGuard.Do(listenerCloseFunc)

	infoKeys = append(infoKeys, "version")
	verInfo := version.GetVersion()
	info["version"] = verInfo.FullVersionNumber(false)
	if verInfo.Revision != "" {
		info["version sha"] = strings.Trim(verInfo.Revision, "'")
		infoKeys = append(infoKeys, "version sha")
	}

	infoKeys = append(infoKeys, "recovery mode")
	info["recovery mode"] = "true"

	// Server configuration output
	padding := 24
	sort.Strings(infoKeys)
	c.UI.Output("==> Vault server configuration:\n")
	for _, k := range infoKeys {
		c.UI.Output(fmt.Sprintf(
			"%s%s: %s",
			strings.Repeat(" ", padding-len(k)),
			strings.Title(k),
			info[k]))
	}
	c.UI.Output("")

	for _, ln := range lns {
		handler := vaulthttp.Handler(&vault.HandlerProperties{
			Core:                  core,
			MaxRequestSize:        ln.maxRequestSize,
			MaxRequestDuration:    ln.maxRequestDuration,
			DisablePrintableCheck: config.DisablePrintableCheck,
			RecoveryMode:          c.flagRecovery,
			RecoveryToken:         atomic.NewString(""),
		})

		server := &http.Server{
			Handler:           handler,
			ReadHeaderTimeout: 10 * time.Second,
			ReadTimeout:       30 * time.Second,
			IdleTimeout:       5 * time.Minute,
			ErrorLog:          c.logger.StandardLogger(nil),
		}

		go server.Serve(ln.Listener)
	}

	if sealConfigError != nil {
		init, err := core.Initialized(context.Background())
		if err != nil {
			c.UI.Error(fmt.Sprintf("Error checking if core is initialized: %v", err))
			return 1
		}
		if init {
			c.UI.Error("Vault is initialized but no Seal key could be loaded")
			return 1
		}
	}

	if newCoreError != nil {
		c.UI.Warn(wrapAtLength(
			"WARNING! A non-fatal error occurred during initialization. Please " +
				"check the logs for more information."))
		c.UI.Warn("")
	}

	if !c.flagCombineLogs {
		c.UI.Output("==> Vault server started! Log data will stream in below:\n")
	}

	c.logGate.Flush()

	for {
		select {
		case <-c.ShutdownCh:
			c.UI.Output("==> Vault shutdown triggered")

			c.cleanupGuard.Do(listenerCloseFunc)

			if err := core.Shutdown(); err != nil {
				c.UI.Error(fmt.Sprintf("Error with core shutdown: %s", err))
			}

			return 0

		case <-c.SigUSR2Ch:
			buf := make([]byte, 32*1024*1024)
			n := runtime.Stack(buf[:], true)
			c.logger.Info("goroutine trace", "stack", string(buf[:n]))
		}
	}

	return 0
}

func (c *ServerCommand) adjustLogLevel(config *server.Config, logLevelWasNotSet bool) (string, error) {
	var logLevelString string
	if config.LogLevel != "" && logLevelWasNotSet {
		configLogLevel := strings.ToLower(strings.TrimSpace(config.LogLevel))
		logLevelString = configLogLevel
		switch configLogLevel {
		case "trace":
			c.logger.SetLevel(log.Trace)
		case "debug":
			c.logger.SetLevel(log.Debug)
		case "notice", "info", "":
			c.logger.SetLevel(log.Info)
		case "warn", "warning":
			c.logger.SetLevel(log.Warn)
		case "err", "error":
			c.logger.SetLevel(log.Error)
		default:
			return "", fmt.Errorf("unknown log level: %s", config.LogLevel)
		}
	}
	return logLevelString, nil
}

func (c *ServerCommand) processLogLevelAndFormat(config *server.Config) (log.Level, string, bool, logging.LogFormat, error) {
	// Create a logger. We wrap it in a gated writer so that it doesn't
	// start logging too early.
	c.logGate = &gatedwriter.Writer{Writer: os.Stderr}
	c.logWriter = c.logGate
	if c.flagCombineLogs {
		c.logWriter = os.Stdout
	}
	var level log.Level
	var logLevelWasNotSet bool
	logFormat := logging.UnspecifiedFormat
	logLevelString := c.flagLogLevel
	c.flagLogLevel = strings.ToLower(strings.TrimSpace(c.flagLogLevel))
	switch c.flagLogLevel {
	case notSetValue, "":
		logLevelWasNotSet = true
		logLevelString = "info"
		level = log.Info
	case "trace":
		level = log.Trace
	case "debug":
		level = log.Debug
	case "notice", "info":
		level = log.Info
	case "warn", "warning":
		level = log.Warn
	case "err", "error":
		level = log.Error
	default:
		return level, logLevelString, logLevelWasNotSet, logFormat, fmt.Errorf("unknown log level: %s", c.flagLogLevel)
	}

	if c.flagLogFormat != notSetValue {
		var err error
		logFormat, err = logging.ParseLogFormat(c.flagLogFormat)
		if err != nil {
			return level, logLevelString, logLevelWasNotSet, logFormat, err
		}
	}
	if logFormat == logging.UnspecifiedFormat {
		logFormat = logging.ParseEnvLogFormat()
	}
	if logFormat == logging.UnspecifiedFormat {
		var err error
		logFormat, err = logging.ParseLogFormat(config.LogFormat)
		if err != nil {
			return level, logLevelString, logLevelWasNotSet, logFormat, err
		}
	}

	return level, logLevelString, logLevelWasNotSet, logFormat, nil
}

func (c *ServerCommand) Run(args []string) int {
	f := c.Flags()

	if err := f.Parse(args); err != nil {
		c.UI.Error(err.Error())
		return 1
	}

	if c.flagRecovery {
		return c.runRecoveryMode()
	}

	// Automatically enable dev mode if other dev flags are provided.
	if c.flagDevHA || c.flagDevTransactional || c.flagDevLeasedKV || c.flagDevThreeNode || c.flagDevFourCluster || c.flagDevAutoSeal || c.flagDevKVV1 {
		c.flagDev = true
	}

	// Validation
	if !c.flagDev {
		switch {
		case len(c.flagConfigs) == 0:
			c.UI.Error("Must specify at least one config path using -config")
			return 1
		case c.flagDevRootTokenID != "":
			c.UI.Warn(wrapAtLength(
				"You cannot specify a custom root token ID outside of \"dev\" mode. " +
					"Your request has been ignored."))
			c.flagDevRootTokenID = ""
		}
	}

	// Load the configuration
	var config *server.Config
	if c.flagDev {
		var devStorageType string
		switch {
		case c.flagDevConsul:
			devStorageType = "consul"
		case c.flagDevHA && c.flagDevTransactional:
			devStorageType = "inmem_transactional_ha"
		case !c.flagDevHA && c.flagDevTransactional:
			devStorageType = "inmem_transactional"
		case c.flagDevHA && !c.flagDevTransactional:
			devStorageType = "inmem_ha"
		default:
			devStorageType = "inmem"
		}
		config = server.DevConfig(devStorageType)
		if c.flagDevListenAddr != "" {
			config.Listeners[0].Config["address"] = c.flagDevListenAddr
		}
	}

	parsedConfig, err := c.parseConfig()
	if err != nil {
		c.UI.Error(err.Error())
		return 1
	}
	if config == nil {
		config = parsedConfig
	} else {
		config = config.Merge(parsedConfig)
	}

	// Ensure at least one config was found.
	if config == nil {
		c.UI.Output(wrapAtLength(
			"No configuration files found. Please provide configurations with the " +
				"-config flag. If you are supplying the path to a directory, please " +
				"ensure the directory contains files with the .hcl or .json " +
				"extension."))
		return 1
	}

	level, logLevelString, logLevelWasNotSet, logFormat, err := c.processLogLevelAndFormat(config)
	if err != nil {
		c.UI.Error(err.Error())
		return 1
	}

	if c.flagDevThreeNode || c.flagDevFourCluster {
		c.logger = log.New(&log.LoggerOptions{
			Mutex:  &sync.Mutex{},
			Output: c.logWriter,
			Level:  log.Trace,
		})
	} else {
		c.logger = log.New(&log.LoggerOptions{
			Output: c.logWriter,
			Level:  level,
			// Note that if logFormat is either unspecified or standard, then
			// the resulting logger's format will be standard.
			JSONFormat: logFormat == logging.JSONFormat,
		})
	}

	allLoggers := []log.Logger{c.logger}

	logLevelStr, err := c.adjustLogLevel(config, logLevelWasNotSet)
	if err != nil {
		c.UI.Error(err.Error())
		return 1
	}
	if logLevelStr != "" {
		logLevelString = logLevelStr
	}

	// create GRPC logger
	namedGRPCLogFaker := c.logger.Named("grpclogfaker")
	allLoggers = append(allLoggers, namedGRPCLogFaker)
	grpclog.SetLogger(&grpclogFaker{
		logger: namedGRPCLogFaker,
		log:    os.Getenv("VAULT_GRPC_LOGGING") != "",
	})

	if memProfilerEnabled {
		c.startMemProfiler()
	}

	// Ensure that a backend is provided
	if config.Storage == nil {
		c.UI.Output("A storage backend must be specified")
		return 1
	}

	if config.DefaultMaxRequestDuration != 0 {
		vault.DefaultMaxRequestDuration = config.DefaultMaxRequestDuration
	}

	// log proxy settings
	proxyCfg := httpproxy.FromEnvironment()
	c.logger.Info("proxy environment", "http_proxy", proxyCfg.HTTPProxy,
		"https_proxy", proxyCfg.HTTPSProxy, "no_proxy", proxyCfg.NoProxy)

	// If mlockall(2) isn't supported, show a warning. We disable this in dev
	// because it is quite scary to see when first using Vault. We also disable
	// this if the user has explicitly disabled mlock in configuration.
	if !c.flagDev && !config.DisableMlock && !mlock.Supported() {
		c.UI.Warn(wrapAtLength(
			"WARNING! mlock is not supported on this system! An mlockall(2)-like " +
				"syscall to prevent memory from being swapped to disk is not " +
				"supported on this system. For better security, only run Vault on " +
				"systems where this call is supported. If you are running Vault " +
				"in a Docker container, provide the IPC_LOCK cap to the container."))
	}

	metricsHelper, err := c.setupTelemetry(config)
	if err != nil {
		c.UI.Error(fmt.Sprintf("Error initializing telemetry: %s", err))
		return 1
	}

	// Initialize the backend
	factory, exists := c.PhysicalBackends[config.Storage.Type]
	if !exists {
		c.UI.Error(fmt.Sprintf("Unknown storage type %s", config.Storage.Type))
		return 1
	}

	if config.Storage.Type == "raft" {
		if envCA := os.Getenv("VAULT_CLUSTER_ADDR"); envCA != "" {
			config.ClusterAddr = envCA
		}

		if len(config.ClusterAddr) == 0 {
			c.UI.Error("Cluster address must be set when using raft storage")
			return 1
		}
	}

	namedStorageLogger := c.logger.Named("storage." + config.Storage.Type)
	allLoggers = append(allLoggers, namedStorageLogger)
	backend, err := factory(config.Storage.Config, namedStorageLogger)
	if err != nil {
		c.UI.Error(fmt.Sprintf("Error initializing storage of type %s: %s", config.Storage.Type, err))
		return 1
	}

	// Prevent server startup if migration is active
	if c.storageMigrationActive(backend) {
		return 1
	}

	infoKeys := make([]string, 0, 10)
	info := make(map[string]string)
	info["log level"] = logLevelString
	infoKeys = append(infoKeys, "log level")

	var barrierSeal vault.Seal
	var unwrapSeal vault.Seal

	var sealConfigError error
	if c.flagDevAutoSeal {
		barrierSeal = vault.NewAutoSeal(vaultseal.NewTestSeal(nil))
	} else {
		// Handle the case where no seal is provided
		switch len(config.Seals) {
		case 0:
			config.Seals = append(config.Seals, &server.Seal{Type: vaultseal.Shamir})
		case 1:
			// If there's only one seal and it's disabled assume they want to
			// migrate to a shamir seal and simply didn't provide it
			if config.Seals[0].Disabled {
				config.Seals = append(config.Seals, &server.Seal{Type: vaultseal.Shamir})
			}
		}
		for _, configSeal := range config.Seals {
			sealType := vaultseal.Shamir
			if !configSeal.Disabled && os.Getenv("VAULT_SEAL_TYPE") != "" {
				sealType = os.Getenv("VAULT_SEAL_TYPE")
				configSeal.Type = sealType
			} else {
				sealType = configSeal.Type
			}

			var seal vault.Seal
			sealLogger := c.logger.Named(sealType)
			allLoggers = append(allLoggers, sealLogger)
			seal, sealConfigError = serverseal.ConfigureSeal(configSeal, &infoKeys, &info, sealLogger, vault.NewDefaultSeal(shamirseal.NewSeal(c.logger.Named("shamir"))))
			if sealConfigError != nil {
				if !errwrap.ContainsType(sealConfigError, new(logical.KeyNotFoundError)) {
					c.UI.Error(fmt.Sprintf(
						"Error parsing Seal configuration: %s", sealConfigError))
					return 1
				}
			}
			if seal == nil {
				c.UI.Error(fmt.Sprintf(
					"After configuring seal nil returned, seal type was %s", sealType))
				return 1
			}

			if configSeal.Disabled {
				unwrapSeal = seal
			} else {
				barrierSeal = seal
			}

			// Ensure that the seal finalizer is called, even if using verify-only
			defer func() {
				err = seal.Finalize(context.Background())
				if err != nil {
					c.UI.Error(fmt.Sprintf("Error finalizing seals: %v", err))
				}
			}()

		}
	}

	if barrierSeal == nil {
		c.UI.Error(fmt.Sprintf("Could not create barrier seal! Most likely proper Seal configuration information was not set, but no error was generated."))
		return 1
	}

	// prepare a secure random reader for core
	secureRandomReader, err := createSecureRandomReaderFunc(config, &barrierSeal)
	if err != nil {
		c.UI.Error(err.Error())
		return 1
	}

	coreConfig := &vault.CoreConfig{
		RawConfig:                 config,
		Physical:                  backend,
		RedirectAddr:              config.Storage.RedirectAddr,
		StorageType:               config.Storage.Type,
		HAPhysical:                nil,
		Seal:                      barrierSeal,
		AuditBackends:             c.AuditBackends,
		CredentialBackends:        c.CredentialBackends,
		LogicalBackends:           c.LogicalBackends,
		Logger:                    c.logger,
		DisableCache:              config.DisableCache,
		DisableMlock:              config.DisableMlock,
		MaxLeaseTTL:               config.MaxLeaseTTL,
		DefaultLeaseTTL:           config.DefaultLeaseTTL,
		ClusterName:               config.ClusterName,
		CacheSize:                 config.CacheSize,
		PluginDirectory:           config.PluginDirectory,
		EnableUI:                  config.EnableUI,
		EnableRaw:                 config.EnableRawEndpoint,
		DisableSealWrap:           config.DisableSealWrap,
		DisablePerformanceStandby: config.DisablePerformanceStandby,
		DisableIndexing:           config.DisableIndexing,
		AllLoggers:                allLoggers,
		BuiltinRegistry:           builtinplugins.Registry,
		DisableKeyEncodingChecks:  config.DisablePrintableCheck,
		MetricsHelper:             metricsHelper,
		SecureRandomReader:        secureRandomReader,
	}
	if c.flagDev {
		coreConfig.DevToken = c.flagDevRootTokenID
		if c.flagDevLeasedKV {
			coreConfig.LogicalBackends["kv"] = vault.LeasedPassthroughBackendFactory
		}
		if c.flagDevPluginDir != "" {
			coreConfig.PluginDirectory = c.flagDevPluginDir
		}
		if c.flagDevLatency > 0 {
			injectLatency := time.Duration(c.flagDevLatency) * time.Millisecond
			if _, txnOK := backend.(physical.Transactional); txnOK {
				coreConfig.Physical = physical.NewTransactionalLatencyInjector(backend, injectLatency, c.flagDevLatencyJitter, c.logger)
			} else {
				coreConfig.Physical = physical.NewLatencyInjector(backend, injectLatency, c.flagDevLatencyJitter, c.logger)
			}
		}
	}

	if c.flagDevThreeNode {
		return c.enableThreeNodeDevCluster(coreConfig, info, infoKeys, c.flagDevListenAddr, os.Getenv("VAULT_DEV_TEMP_DIR"))
	}

	if c.flagDevFourCluster {
		return enableFourClusterDev(c, coreConfig, info, infoKeys, c.flagDevListenAddr, os.Getenv("VAULT_DEV_TEMP_DIR"))
	}

	var disableClustering bool

	// Initialize the separate HA storage backend, if it exists
	var ok bool
	if config.HAStorage != nil {
		factory, exists := c.PhysicalBackends[config.HAStorage.Type]
		if !exists {
			c.UI.Error(fmt.Sprintf("Unknown HA storage type %s", config.HAStorage.Type))
			return 1

		}
		habackend, err := factory(config.HAStorage.Config, c.logger)
		if err != nil {
			c.UI.Error(fmt.Sprintf(
				"Error initializing HA storage of type %s: %s", config.HAStorage.Type, err))
			return 1

		}

		if coreConfig.HAPhysical, ok = habackend.(physical.HABackend); !ok {
			c.UI.Error("Specified HA storage does not support HA")
			return 1
		}

		if !coreConfig.HAPhysical.HAEnabled() {
			c.UI.Error("Specified HA storage has HA support disabled; please consult documentation")
			return 1
		}

		coreConfig.RedirectAddr = config.HAStorage.RedirectAddr
		disableClustering = config.HAStorage.DisableClustering
		if !disableClustering {
			coreConfig.ClusterAddr = config.HAStorage.ClusterAddr
		}
	} else {
		if coreConfig.HAPhysical, ok = backend.(physical.HABackend); ok {
			coreConfig.RedirectAddr = config.Storage.RedirectAddr
			disableClustering = config.Storage.DisableClustering
			if !disableClustering {
				coreConfig.ClusterAddr = config.Storage.ClusterAddr
			}
		}
	}

	if envRA := os.Getenv("VAULT_API_ADDR"); envRA != "" {
		coreConfig.RedirectAddr = envRA
	} else if envRA := os.Getenv("VAULT_REDIRECT_ADDR"); envRA != "" {
		coreConfig.RedirectAddr = envRA
	} else if envAA := os.Getenv("VAULT_ADVERTISE_ADDR"); envAA != "" {
		coreConfig.RedirectAddr = envAA
	}

	// Attempt to detect the redirect address, if possible
	if coreConfig.RedirectAddr == "" {
		c.logger.Warn("no `api_addr` value specified in config or in VAULT_API_ADDR; falling back to detection if possible, but this value should be manually set")
	}
	var detect physical.RedirectDetect
	if coreConfig.HAPhysical != nil && coreConfig.HAPhysical.HAEnabled() {
		detect, ok = coreConfig.HAPhysical.(physical.RedirectDetect)
	} else {
		detect, ok = coreConfig.Physical.(physical.RedirectDetect)
	}
	if ok && coreConfig.RedirectAddr == "" {
		redirect, err := c.detectRedirect(detect, config)
		if err != nil {
			c.UI.Error(fmt.Sprintf("Error detecting api address: %s", err))
		} else if redirect == "" {
			c.UI.Error("Failed to detect api address")
		} else {
			coreConfig.RedirectAddr = redirect
		}
	}
	if coreConfig.RedirectAddr == "" && c.flagDev {
		coreConfig.RedirectAddr = fmt.Sprintf("http://%s", config.Listeners[0].Config["address"])
	}

	// After the redirect bits are sorted out, if no cluster address was
	// explicitly given, derive one from the redirect addr
	if disableClustering {
		coreConfig.ClusterAddr = ""
	} else if envCA := os.Getenv("VAULT_CLUSTER_ADDR"); envCA != "" {
		coreConfig.ClusterAddr = envCA
	} else {
		var addrToUse string
		switch {
		case coreConfig.ClusterAddr == "" && coreConfig.RedirectAddr != "":
			addrToUse = coreConfig.RedirectAddr
		case c.flagDev:
			addrToUse = fmt.Sprintf("http://%s", config.Listeners[0].Config["address"])
		default:
			goto CLUSTER_SYNTHESIS_COMPLETE
		}
		u, err := url.ParseRequestURI(addrToUse)
		if err != nil {
			c.UI.Error(fmt.Sprintf(
				"Error parsing synthesized cluster address %s: %v", addrToUse, err))
			return 1
		}
		host, port, err := net.SplitHostPort(u.Host)
		if err != nil {
			// This sucks, as it's a const in the function but not exported in the package
			if strings.Contains(err.Error(), "missing port in address") {
				host = u.Host
				port = "443"
			} else {
				c.UI.Error(fmt.Sprintf("Error parsing api address: %v", err))
				return 1
			}
		}
		nPort, err := strconv.Atoi(port)
		if err != nil {
			c.UI.Error(fmt.Sprintf(
				"Error parsing synthesized address; failed to convert %q to a numeric: %v", port, err))
			return 1
		}
		u.Host = net.JoinHostPort(host, strconv.Itoa(nPort+1))
		// Will always be TLS-secured
		u.Scheme = "https"
		coreConfig.ClusterAddr = u.String()
	}

CLUSTER_SYNTHESIS_COMPLETE:

	if coreConfig.RedirectAddr == coreConfig.ClusterAddr && len(coreConfig.RedirectAddr) != 0 {
		c.UI.Error(fmt.Sprintf(
			"Address %q used for both API and cluster addresses", coreConfig.RedirectAddr))
		return 1
	}

	if coreConfig.ClusterAddr != "" {
		// Force https as we'll always be TLS-secured
		u, err := url.ParseRequestURI(coreConfig.ClusterAddr)
		if err != nil {
			c.UI.Error(fmt.Sprintf("Error parsing cluster address %s: %v", coreConfig.ClusterAddr, err))
			return 11
		}
		u.Scheme = "https"
		coreConfig.ClusterAddr = u.String()
	}

	// Override the UI enabling config by the environment variable
	if enableUI := os.Getenv("VAULT_UI"); enableUI != "" {
		var err error
		coreConfig.EnableUI, err = strconv.ParseBool(enableUI)
		if err != nil {
			c.UI.Output("Error parsing the environment variable VAULT_UI")
			return 1
		}
	}

	// Initialize the core
	core, newCoreError := vault.NewCore(coreConfig)
	if newCoreError != nil {
		if vault.IsFatalError(newCoreError) {
			c.UI.Error(fmt.Sprintf("Error initializing core: %s", newCoreError))
			return 1
		}
	}

	// Copy the reload funcs pointers back
	c.reloadFuncs = coreConfig.ReloadFuncs
	c.reloadFuncsLock = coreConfig.ReloadFuncsLock

	// Compile server information for output later
	info["storage"] = config.Storage.Type
	info["mlock"] = fmt.Sprintf(
		"supported: %v, enabled: %v",
		mlock.Supported(), !config.DisableMlock && mlock.Supported())
	infoKeys = append(infoKeys, "mlock", "storage")

	if coreConfig.ClusterAddr != "" {
		info["cluster address"] = coreConfig.ClusterAddr
		infoKeys = append(infoKeys, "cluster address")
	}
	if coreConfig.RedirectAddr != "" {
		info["api address"] = coreConfig.RedirectAddr
		infoKeys = append(infoKeys, "api address")
	}

	if config.HAStorage != nil {
		info["HA storage"] = config.HAStorage.Type
		infoKeys = append(infoKeys, "HA storage")
	} else {
		// If the storage supports HA, then note it
		if coreConfig.HAPhysical != nil {
			if coreConfig.HAPhysical.HAEnabled() {
				info["storage"] += " (HA available)"
			} else {
				info["storage"] += " (HA disabled)"
			}
		}
	}

	clusterAddrs := []*net.TCPAddr{}

	// Initialize the listeners
	lns := make([]ServerListener, 0, len(config.Listeners))
	c.reloadFuncsLock.Lock()
	for i, lnConfig := range config.Listeners {
		ln, props, reloadFunc, err := server.NewListener(lnConfig.Type, lnConfig.Config, c.logWriter, c.UI)
		if err != nil {
			c.UI.Error(fmt.Sprintf("Error initializing listener of type %s: %s", lnConfig.Type, err))
			return 1
		}

		if reloadFunc != nil {
			relSlice := (*c.reloadFuncs)["listener|"+lnConfig.Type]
			relSlice = append(relSlice, reloadFunc)
			(*c.reloadFuncs)["listener|"+lnConfig.Type] = relSlice
		}

		if !disableClustering && lnConfig.Type == "tcp" {
			var addrRaw interface{}
			var addr string
			var ok bool
			if addrRaw, ok = lnConfig.Config["cluster_address"]; ok {
				addr = addrRaw.(string)
				tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
				if err != nil {
					c.UI.Error(fmt.Sprintf("Error resolving cluster_address: %s", err))
					return 1
				}
				clusterAddrs = append(clusterAddrs, tcpAddr)
			} else {
				tcpAddr, ok := ln.Addr().(*net.TCPAddr)
				if !ok {
					c.UI.Error("Failed to parse tcp listener")
					return 1
				}
				clusterAddr := &net.TCPAddr{
					IP:   tcpAddr.IP,
					Port: tcpAddr.Port + 1,
				}
				clusterAddrs = append(clusterAddrs, clusterAddr)
				addr = clusterAddr.String()
			}
			props["cluster address"] = addr
		}

		var maxRequestSize int64 = vaulthttp.DefaultMaxRequestSize
		if valRaw, ok := lnConfig.Config["max_request_size"]; ok {
			val, err := parseutil.ParseInt(valRaw)
			if err != nil {
				c.UI.Error(fmt.Sprintf("Could not parse max_request_size value %v", valRaw))
				return 1
			}

			if val >= 0 {
				maxRequestSize = val
			}
		}
		props["max_request_size"] = fmt.Sprintf("%d", maxRequestSize)

		maxRequestDuration := vault.DefaultMaxRequestDuration
		if valRaw, ok := lnConfig.Config["max_request_duration"]; ok {
			val, err := parseutil.ParseDurationSecond(valRaw)
			if err != nil {
				c.UI.Error(fmt.Sprintf("Could not parse max_request_duration value %v", valRaw))
				return 1
			}

			if val >= 0 {
				maxRequestDuration = val
			}
		}
		props["max_request_duration"] = fmt.Sprintf("%s", maxRequestDuration.String())

		var unauthenticatedMetricsAccess bool
		if telemetryRaw, ok := lnConfig.Config["telemetry"]; ok {
			telemetry, ok := telemetryRaw.([]map[string]interface{})
			if !ok {
				c.UI.Error(fmt.Sprintf("Could not parse telemetry sink value %v", telemetryRaw))
				return 1
			}

			for _, item := range telemetry {
				if valRaw, ok := item["unauthenticated_metrics_access"]; ok {
					unauthenticatedMetricsAccess, err = parseutil.ParseBool(valRaw)
					if err != nil {
						c.UI.Error(fmt.Sprintf("Could not parse unauthenticated_metrics_access value %v", valRaw))
						return 1
					}
				}
			}
		}

		lns = append(lns, ServerListener{
			Listener:                     ln,
			config:                       lnConfig.Config,
			maxRequestSize:               maxRequestSize,
			maxRequestDuration:           maxRequestDuration,
			unauthenticatedMetricsAccess: unauthenticatedMetricsAccess,
		})

		// Store the listener props for output later
		key := fmt.Sprintf("listener %d", i+1)
		propsList := make([]string, 0, len(props))
		for k, v := range props {
			propsList = append(propsList, fmt.Sprintf(
				"%s: %q", k, v))
		}
		sort.Strings(propsList)
		infoKeys = append(infoKeys, key)
		info[key] = fmt.Sprintf(
			"%s (%s)", lnConfig.Type, strings.Join(propsList, ", "))

	}
	c.reloadFuncsLock.Unlock()
	if !disableClustering {
		if c.logger.IsDebug() {
			c.logger.Debug("cluster listener addresses synthesized", "cluster_addresses", clusterAddrs)
		}
	}

	// Make sure we close all listeners from this point on
	listenerCloseFunc := func() {
		for _, ln := range lns {
			ln.Listener.Close()
		}
	}

	defer c.cleanupGuard.Do(listenerCloseFunc)

	infoKeys = append(infoKeys, "version")
	verInfo := version.GetVersion()
	info["version"] = verInfo.FullVersionNumber(false)
	if verInfo.Revision != "" {
		info["version sha"] = strings.Trim(verInfo.Revision, "'")
		infoKeys = append(infoKeys, "version sha")
	}
	infoKeys = append(infoKeys, "cgo")
	info["cgo"] = "disabled"
	if version.CgoEnabled {
		info["cgo"] = "enabled"
	}

	infoKeys = append(infoKeys, "recovery mode")
	info["recovery mode"] = "false"

	// Server configuration output
	padding := 24
	sort.Strings(infoKeys)
	c.UI.Output("==> Vault server configuration:\n")
	for _, k := range infoKeys {
		c.UI.Output(fmt.Sprintf(
			"%s%s: %s",
			strings.Repeat(" ", padding-len(k)),
			strings.Title(k),
			info[k]))
	}
	c.UI.Output("")

	// Tests might not want to start a vault server and just want to verify
	// the configuration.
	if c.flagTestVerifyOnly {
		return 0
	}

	// This needs to happen before we first unseal, so before we trigger dev
	// mode if it's set
	core.SetClusterListenerAddrs(clusterAddrs)
	core.SetClusterHandler(vaulthttp.Handler(&vault.HandlerProperties{
		Core: core,
	}))

	// Before unsealing with stored keys, setup seal migration if needed
	if err := adjustCoreForSealMigration(c.logger, core, barrierSeal, unwrapSeal); err != nil {
		c.UI.Error(err.Error())
		return 1
	}

	// Attempt unsealing in a background goroutine. This is needed for when a
	// Vault cluster with multiple servers is configured with auto-unseal but is
	// uninitialized. Once one server initializes the storage backend, this
	// goroutine will pick up the unseal keys and unseal this instance.
	if !core.IsInSealMigration() {
		go func() {
			for {
				err := core.UnsealWithStoredKeys(context.Background())
				if err == nil {
					return
				}

				if vault.IsFatalError(err) {
					c.logger.Error("error unsealing core", "error", err)
					return
				} else {
					c.logger.Warn("failed to unseal core", "error", err)
				}

				select {
				case <-c.ShutdownCh:
					return
				case <-time.After(5 * time.Second):
				}
			}
		}()
	}

	// Perform service discovery registrations and initialization of
	// HTTP server after the verifyOnly check.

	// Instantiate the wait group
	c.WaitGroup = &sync.WaitGroup{}

	// If the backend supports service discovery, run service discovery
	if coreConfig.HAPhysical != nil && coreConfig.HAPhysical.HAEnabled() {
		sd, ok := coreConfig.HAPhysical.(physical.ServiceDiscovery)
		if ok {
			activeFunc := func() bool {
				if isLeader, _, _, err := core.Leader(); err == nil {
					return isLeader
				}
				return false
			}

			if err := sd.RunServiceDiscovery(c.WaitGroup, c.ShutdownCh, coreConfig.RedirectAddr, activeFunc, core.Sealed, core.PerfStandby); err != nil {
				c.UI.Error(fmt.Sprintf("Error initializing service discovery: %v", err))
				return 1
			}
		}
	}

	// If we're in Dev mode, then initialize the core
	if c.flagDev && !c.flagDevSkipInit {
		init, err := c.enableDev(core, coreConfig)
		if err != nil {
			c.UI.Error(fmt.Sprintf("Error initializing Dev mode: %s", err))
			return 1
		}

		var plugins, pluginsNotLoaded []string
		if c.flagDevPluginDir != "" && c.flagDevPluginInit {

			f, err := os.Open(c.flagDevPluginDir)
			if err != nil {
				c.UI.Error(fmt.Sprintf("Error reading plugin dir: %s", err))
				return 1
			}

			list, err := f.Readdirnames(0)
			f.Close()
			if err != nil {
				c.UI.Error(fmt.Sprintf("Error listing plugins: %s", err))
				return 1
			}

			for _, name := range list {
				path := filepath.Join(f.Name(), name)
				if err := c.addPlugin(path, init.RootToken, core); err != nil {
					if !errwrap.Contains(err, vault.ErrPluginBadType.Error()) {
						c.UI.Error(fmt.Sprintf("Error enabling plugin %s: %s", name, err))
						return 1
					}
					pluginsNotLoaded = append(pluginsNotLoaded, name)
					continue
				}
				plugins = append(plugins, name)
			}

			sort.Strings(plugins)
		}

		// Print the big dev mode warning!
		c.UI.Warn(wrapAtLength(
			"WARNING! dev mode is enabled! In this mode, Vault runs entirely " +
				"in-memory and starts unsealed with a single unseal key. The root " +
				"token is already authenticated to the CLI, so you can immediately " +
				"begin using Vault."))
		c.UI.Warn("")
		c.UI.Warn("You may need to set the following environment variable:")
		c.UI.Warn("")

		endpointURL := "http://" + config.Listeners[0].Config["address"].(string)
		if runtime.GOOS == "windows" {
			c.UI.Warn("PowerShell:")
			c.UI.Warn(fmt.Sprintf("    $env:VAULT_ADDR=\"%s\"", endpointURL))
			c.UI.Warn("cmd.exe:")
			c.UI.Warn(fmt.Sprintf("    set VAULT_ADDR=%s", endpointURL))
		} else {
			c.UI.Warn(fmt.Sprintf("    $ export VAULT_ADDR='%s'", endpointURL))
		}

		// Unseal key is not returned if stored shares is supported
		if len(init.SecretShares) > 0 {
			c.UI.Warn("")
			c.UI.Warn(wrapAtLength(
				"The unseal key and root token are displayed below in case you want " +
					"to seal/unseal the Vault or re-authenticate."))
			c.UI.Warn("")
			c.UI.Warn(fmt.Sprintf("Unseal Key: %s", base64.StdEncoding.EncodeToString(init.SecretShares[0])))
		}

		if len(init.RecoveryShares) > 0 {
			c.UI.Warn("")
			c.UI.Warn(wrapAtLength(
				"The recovery key and root token are displayed below in case you want " +
					"to seal/unseal the Vault or re-authenticate."))
			c.UI.Warn("")
			c.UI.Warn(fmt.Sprintf("Recovery Key: %s", base64.StdEncoding.EncodeToString(init.RecoveryShares[0])))
		}

		c.UI.Warn(fmt.Sprintf("Root Token: %s", init.RootToken))

		if len(plugins) > 0 {
			c.UI.Warn("")
			c.UI.Warn(wrapAtLength(
				"The following dev plugins are registered in the catalog:"))
			for _, p := range plugins {
				c.UI.Warn(fmt.Sprintf("    - %s", p))
			}
		}

		if len(pluginsNotLoaded) > 0 {
			c.UI.Warn("")
			c.UI.Warn(wrapAtLength(
				"The following dev plugins FAILED to be registered in the catalog due to unknown type:"))
			for _, p := range pluginsNotLoaded {
				c.UI.Warn(fmt.Sprintf("    - %s", p))
			}
		}

		c.UI.Warn("")
		c.UI.Warn(wrapAtLength(
			"Development mode should NOT be used in production installations!"))
		c.UI.Warn("")
	}

	// Initialize the HTTP servers
	for _, ln := range lns {
		handler := vaulthttp.Handler(&vault.HandlerProperties{
			Core:                         core,
			MaxRequestSize:               ln.maxRequestSize,
			MaxRequestDuration:           ln.maxRequestDuration,
			DisablePrintableCheck:        config.DisablePrintableCheck,
			UnauthenticatedMetricsAccess: ln.unauthenticatedMetricsAccess,
			RecoveryMode:                 c.flagRecovery,
		})

		// We perform validation on the config earlier, we can just cast here
		if _, ok := ln.config["x_forwarded_for_authorized_addrs"]; ok {
			hopSkips := ln.config["x_forwarded_for_hop_skips"].(int)
			authzdAddrs := ln.config["x_forwarded_for_authorized_addrs"].([]*sockaddr.SockAddrMarshaler)
			rejectNotPresent := ln.config["x_forwarded_for_reject_not_present"].(bool)
			rejectNonAuthz := ln.config["x_forwarded_for_reject_not_authorized"].(bool)
			if len(authzdAddrs) > 0 {
				handler = vaulthttp.WrapForwardedForHandler(handler, authzdAddrs, rejectNotPresent, rejectNonAuthz, hopSkips)
			}
		}

		// server defaults
		server := &http.Server{
			Handler:           handler,
			ReadHeaderTimeout: 10 * time.Second,
			ReadTimeout:       30 * time.Second,
			IdleTimeout:       5 * time.Minute,
			ErrorLog:          c.logger.StandardLogger(nil),
		}

		// override server defaults with config values for read/write/idle timeouts if configured
		if readHeaderTimeoutInterface, ok := ln.config["http_read_header_timeout"]; ok {
			readHeaderTimeout, err := parseutil.ParseDurationSecond(readHeaderTimeoutInterface)
			if err != nil {
				c.UI.Error(fmt.Sprintf("Could not parse a time value for http_read_header_timeout %v", readHeaderTimeout))
				return 1
			}
			server.ReadHeaderTimeout = readHeaderTimeout
		}

		if readTimeoutInterface, ok := ln.config["http_read_timeout"]; ok {
			readTimeout, err := parseutil.ParseDurationSecond(readTimeoutInterface)
			if err != nil {
				c.UI.Error(fmt.Sprintf("Could not parse a time value for http_read_timeout %v", readTimeout))
				return 1
			}
			server.ReadTimeout = readTimeout
		}

		if writeTimeoutInterface, ok := ln.config["http_write_timeout"]; ok {
			writeTimeout, err := parseutil.ParseDurationSecond(writeTimeoutInterface)
			if err != nil {
				c.UI.Error(fmt.Sprintf("Could not parse a time value for http_write_timeout %v", writeTimeout))
				return 1
			}
			server.WriteTimeout = writeTimeout
		}

		if idleTimeoutInterface, ok := ln.config["http_idle_timeout"]; ok {
			idleTimeout, err := parseutil.ParseDurationSecond(idleTimeoutInterface)
			if err != nil {
				c.UI.Error(fmt.Sprintf("Could not parse a time value for http_idle_timeout %v", idleTimeout))
				return 1
			}
			server.IdleTimeout = idleTimeout
		}

		// server config tests can exit now
		if c.flagTestServerConfig {
			continue
		}

		go server.Serve(ln.Listener)
	}

	if c.flagTestServerConfig {
		return 0
	}

	if sealConfigError != nil {
		init, err := core.Initialized(context.Background())
		if err != nil {
			c.UI.Error(fmt.Sprintf("Error checking if core is initialized: %v", err))
			return 1
		}
		if init {
			c.UI.Error("Vault is initialized but no Seal key could be loaded")
			return 1
		}
	}

	if newCoreError != nil {
		c.UI.Warn(wrapAtLength(
			"WARNING! A non-fatal error occurred during initialization. Please " +
				"check the logs for more information."))
		c.UI.Warn("")
	}

	// Output the header that the server has started
	if !c.flagCombineLogs {
		c.UI.Output("==> Vault server started! Log data will stream in below:\n")
	}

	// Inform any tests that the server is ready
	select {
	case c.startedCh <- struct{}{}:
	default:
	}

	// Release the log gate.
	c.logGate.Flush()

	// Write out the PID to the file now that server has successfully started
	if err := c.storePidFile(config.PidFile); err != nil {
		c.UI.Error(fmt.Sprintf("Error storing PID: %s", err))
		return 1
	}

	defer func() {
		if err := c.removePidFile(config.PidFile); err != nil {
			c.UI.Error(fmt.Sprintf("Error deleting the PID file: %s", err))
		}
	}()

	// Wait for shutdown
	shutdownTriggered := false

	for !shutdownTriggered {
		select {
		case <-c.ShutdownCh:
			c.UI.Output("==> Vault shutdown triggered")

			// Stop the listeners so that we don't process further client requests.
			c.cleanupGuard.Do(listenerCloseFunc)

			// Shutdown will wait until after Vault is sealed, which means the
			// request forwarding listeners will also be closed (and also
			// waited for).
			if err := core.Shutdown(); err != nil {
				c.UI.Error(fmt.Sprintf("Error with core shutdown: %s", err))
			}

			shutdownTriggered = true

		case <-c.SighupCh:
			c.UI.Output("==> Vault reload triggered")

			// Check for new log level
			var config *server.Config
			var level log.Level
			for _, path := range c.flagConfigs {
				current, err := server.LoadConfig(path)
				if err != nil {
					c.logger.Error("could not reload config", "path", path, "error", err)
					goto RUNRELOADFUNCS
				}

				if config == nil {
					config = current
				} else {
					config = config.Merge(current)
				}
			}

			// Ensure at least one config was found.
			if config == nil {
				c.logger.Error("no config found at reload time")
				goto RUNRELOADFUNCS
			}

			core.SetConfig(config)

			if config.LogLevel != "" {
				configLogLevel := strings.ToLower(strings.TrimSpace(config.LogLevel))
				switch configLogLevel {
				case "trace":
					level = log.Trace
				case "debug":
					level = log.Debug
				case "notice", "info", "":
					level = log.Info
				case "warn", "warning":
					level = log.Warn
				case "err", "error":
					level = log.Error
				default:
					c.logger.Error("unknown log level found on reload", "level", config.LogLevel)
					goto RUNRELOADFUNCS
				}
				core.SetLogLevel(level)
			}

		RUNRELOADFUNCS:
			if err := c.Reload(c.reloadFuncsLock, c.reloadFuncs, c.flagConfigs); err != nil {
				c.UI.Error(fmt.Sprintf("Error(s) were encountered during reload: %s", err))
			}

		case <-c.SigUSR2Ch:
			buf := make([]byte, 32*1024*1024)
			n := runtime.Stack(buf[:], true)
			c.logger.Info("goroutine trace", "stack", string(buf[:n]))
		}
	}

	// Wait for dependent goroutines to complete
	c.WaitGroup.Wait()
	return 0
}

func (c *ServerCommand) enableDev(core *vault.Core, coreConfig *vault.CoreConfig) (*vault.InitResult, error) {
	ctx := namespace.ContextWithNamespace(context.Background(), namespace.RootNamespace)

	var recoveryConfig *vault.SealConfig
	barrierConfig := &vault.SealConfig{
		SecretShares:    1,
		SecretThreshold: 1,
	}

	if core.SealAccess().RecoveryKeySupported() {
		recoveryConfig = &vault.SealConfig{
			SecretShares:    1,
			SecretThreshold: 1,
		}
	}

	if core.SealAccess().StoredKeysSupported() {
		barrierConfig.StoredShares = 1
	}

	// Initialize it with a basic single key
	init, err := core.Initialize(ctx, &vault.InitParams{
		BarrierConfig:  barrierConfig,
		RecoveryConfig: recoveryConfig,
	})
	if err != nil {
		return nil, err
	}

	// Handle unseal with stored keys
	if core.SealAccess().StoredKeysSupported() {
		err := core.UnsealWithStoredKeys(ctx)
		if err != nil {
			return nil, err
		}
	} else {
		// Copy the key so that it can be zeroed
		key := make([]byte, len(init.SecretShares[0]))
		copy(key, init.SecretShares[0])

		// Unseal the core
		unsealed, err := core.Unseal(key)
		if err != nil {
			return nil, err
		}
		if !unsealed {
			return nil, fmt.Errorf("failed to unseal Vault for dev mode")
		}
	}

	isLeader, _, _, err := core.Leader()
	if err != nil && err != vault.ErrHANotEnabled {
		return nil, errwrap.Wrapf("failed to check active status: {{err}}", err)
	}
	if err == nil {
		leaderCount := 5
		for !isLeader {
			if leaderCount == 0 {
				buf := make([]byte, 1<<16)
				runtime.Stack(buf, true)
				return nil, fmt.Errorf("failed to get active status after five seconds; call stack is\n%s\n", buf)
			}
			time.Sleep(1 * time.Second)
			isLeader, _, _, err = core.Leader()
			if err != nil {
				return nil, errwrap.Wrapf("failed to check active status: {{err}}", err)
			}
			leaderCount--
		}
	}

	// Generate a dev root token if one is provided in the flag
	if coreConfig.DevToken != "" {
		req := &logical.Request{
			ID:          "dev-gen-root",
			Operation:   logical.UpdateOperation,
			ClientToken: init.RootToken,
			Path:        "auth/token/create",
			Data: map[string]interface{}{
				"id":                coreConfig.DevToken,
				"policies":          []string{"root"},
				"no_parent":         true,
				"no_default_policy": true,
			},
		}
		resp, err := core.HandleRequest(ctx, req)
		if err != nil {
			return nil, errwrap.Wrapf(fmt.Sprintf("failed to create root token with ID %q: {{err}}", coreConfig.DevToken), err)
		}
		if resp == nil {
			return nil, fmt.Errorf("nil response when creating root token with ID %q", coreConfig.DevToken)
		}
		if resp.Auth == nil {
			return nil, fmt.Errorf("nil auth when creating root token with ID %q", coreConfig.DevToken)
		}

		init.RootToken = resp.Auth.ClientToken

		req.ID = "dev-revoke-init-root"
		req.Path = "auth/token/revoke-self"
		req.Data = nil
		resp, err = core.HandleRequest(ctx, req)
		if err != nil {
			return nil, errwrap.Wrapf("failed to revoke initial root token: {{err}}", err)
		}
	}

	// Set the token
	if !c.flagDevNoStoreToken {
		tokenHelper, err := c.TokenHelper()
		if err != nil {
			return nil, err
		}
		if err := tokenHelper.Store(init.RootToken); err != nil {
			return nil, err
		}
	}

	kvVer := "2"
	if c.flagDevKVV1 || c.flagDevLeasedKV {
		kvVer = "1"
	}
	req := &logical.Request{
		Operation:   logical.UpdateOperation,
		ClientToken: init.RootToken,
		Path:        "sys/mounts/secret",
		Data: map[string]interface{}{
			"type":        "kv",
			"path":        "secret/",
			"description": "key/value secret storage",
			"options": map[string]string{
				"version": kvVer,
			},
		},
	}
	resp, err := core.HandleRequest(ctx, req)
	if err != nil {
		return nil, errwrap.Wrapf("error creating default K/V store: {{err}}", err)
	}
	if resp.IsError() {
		return nil, errwrap.Wrapf("failed to create default K/V store: {{err}}", resp.Error())
	}

	return init, nil
}

func (c *ServerCommand) enableThreeNodeDevCluster(base *vault.CoreConfig, info map[string]string, infoKeys []string, devListenAddress, tempDir string) int {
	testCluster := vault.NewTestCluster(&testing.RuntimeT{}, base, &vault.TestClusterOptions{
		HandlerFunc:       vaulthttp.Handler,
		BaseListenAddress: c.flagDevListenAddr,
		Logger:            c.logger,
		TempDir:           tempDir,
	})
	defer c.cleanupGuard.Do(testCluster.Cleanup)

	info["cluster parameters path"] = testCluster.TempDir
	infoKeys = append(infoKeys, "cluster parameters path")

	for i, core := range testCluster.Cores {
		info[fmt.Sprintf("node %d api address", i)] = fmt.Sprintf("https://%s", core.Listeners[0].Address.String())
		infoKeys = append(infoKeys, fmt.Sprintf("node %d api address", i))
	}

	infoKeys = append(infoKeys, "version")
	verInfo := version.GetVersion()
	info["version"] = verInfo.FullVersionNumber(false)
	if verInfo.Revision != "" {
		info["version sha"] = strings.Trim(verInfo.Revision, "'")
		infoKeys = append(infoKeys, "version sha")
	}
	infoKeys = append(infoKeys, "cgo")
	info["cgo"] = "disabled"
	if version.CgoEnabled {
		info["cgo"] = "enabled"
	}

	// Server configuration output
	padding := 24
	sort.Strings(infoKeys)
	c.UI.Output("==> Vault server configuration:\n")
	for _, k := range infoKeys {
		c.UI.Output(fmt.Sprintf(
			"%s%s: %s",
			strings.Repeat(" ", padding-len(k)),
			strings.Title(k),
			info[k]))
	}
	c.UI.Output("")

	for _, core := range testCluster.Cores {
		core.Server.Handler = vaulthttp.Handler(&vault.HandlerProperties{
			Core: core.Core,
		})
		core.SetClusterHandler(core.Server.Handler)
	}

	testCluster.Start()

	ctx := namespace.ContextWithNamespace(context.Background(), namespace.RootNamespace)

	if base.DevToken != "" {
		req := &logical.Request{
			ID:          "dev-gen-root",
			Operation:   logical.UpdateOperation,
			ClientToken: testCluster.RootToken,
			Path:        "auth/token/create",
			Data: map[string]interface{}{
				"id":                base.DevToken,
				"policies":          []string{"root"},
				"no_parent":         true,
				"no_default_policy": true,
			},
		}
		resp, err := testCluster.Cores[0].HandleRequest(ctx, req)
		if err != nil {
			c.UI.Error(fmt.Sprintf("failed to create root token with ID %s: %s", base.DevToken, err))
			return 1
		}
		if resp == nil {
			c.UI.Error(fmt.Sprintf("nil response when creating root token with ID %s", base.DevToken))
			return 1
		}
		if resp.Auth == nil {
			c.UI.Error(fmt.Sprintf("nil auth when creating root token with ID %s", base.DevToken))
			return 1
		}

		testCluster.RootToken = resp.Auth.ClientToken

		req.ID = "dev-revoke-init-root"
		req.Path = "auth/token/revoke-self"
		req.Data = nil
		resp, err = testCluster.Cores[0].HandleRequest(ctx, req)
		if err != nil {
			c.UI.Output(fmt.Sprintf("failed to revoke initial root token: %s", err))
			return 1
		}
	}

	// Set the token
	tokenHelper, err := c.TokenHelper()
	if err != nil {
		c.UI.Error(fmt.Sprintf("Error getting token helper: %s", err))
		return 1
	}
	if err := tokenHelper.Store(testCluster.RootToken); err != nil {
		c.UI.Error(fmt.Sprintf("Error storing in token helper: %s", err))
		return 1
	}

	if err := ioutil.WriteFile(filepath.Join(testCluster.TempDir, "root_token"), []byte(testCluster.RootToken), 0755); err != nil {
		c.UI.Error(fmt.Sprintf("Error writing token to tempfile: %s", err))
		return 1
	}

	c.UI.Output(fmt.Sprintf(
		"==> Three node dev mode is enabled\n\n" +
			"The unseal key and root token are reproduced below in case you\n" +
			"want to seal/unseal the Vault or play with authentication.\n",
	))

	for i, key := range testCluster.BarrierKeys {
		c.UI.Output(fmt.Sprintf(
			"Unseal Key %d: %s",
			i+1, base64.StdEncoding.EncodeToString(key),
		))
	}

	c.UI.Output(fmt.Sprintf(
		"\nRoot Token: %s\n", testCluster.RootToken,
	))

	c.UI.Output(fmt.Sprintf(
		"\nUseful env vars:\n"+
			"VAULT_TOKEN=%s\n"+
			"VAULT_ADDR=%s\n"+
			"VAULT_CACERT=%s/ca_cert.pem\n",
		testCluster.RootToken,
		testCluster.Cores[0].Client.Address(),
		testCluster.TempDir,
	))

	// Output the header that the server has started
	c.UI.Output("==> Vault server started! Log data will stream in below:\n")

	// Inform any tests that the server is ready
	select {
	case c.startedCh <- struct{}{}:
	default:
	}

	// Release the log gate.
	c.logGate.Flush()

	// Wait for shutdown
	shutdownTriggered := false

	for !shutdownTriggered {
		select {
		case <-c.ShutdownCh:
			c.UI.Output("==> Vault shutdown triggered")

			// Stop the listeners so that we don't process further client requests.
			c.cleanupGuard.Do(testCluster.Cleanup)

			// Shutdown will wait until after Vault is sealed, which means the
			// request forwarding listeners will also be closed (and also
			// waited for).
			for _, core := range testCluster.Cores {
				if err := core.Shutdown(); err != nil {
					c.UI.Error(fmt.Sprintf("Error with core shutdown: %s", err))
				}
			}

			shutdownTriggered = true

		case <-c.SighupCh:
			c.UI.Output("==> Vault reload triggered")
			for _, core := range testCluster.Cores {
				if err := c.Reload(core.ReloadFuncsLock, core.ReloadFuncs, nil); err != nil {
					c.UI.Error(fmt.Sprintf("Error(s) were encountered during reload: %s", err))
				}
			}
		}
	}

	return 0
}

// addPlugin adds any plugins to the catalog
func (c *ServerCommand) addPlugin(path, token string, core *vault.Core) error {
	// Get the sha256 of the file at the given path.
	pluginSum := func(p string) (string, error) {
		hasher := sha256.New()
		f, err := os.Open(p)
		if err != nil {
			return "", err
		}
		defer f.Close()
		if _, err := io.Copy(hasher, f); err != nil {
			return "", err
		}
		return hex.EncodeToString(hasher.Sum(nil)), nil
	}

	// Mount any test plugins. We do this explicitly before we inform tests of
	// a completely booted server intentionally.
	sha256sum, err := pluginSum(path)
	if err != nil {
		return err
	}

	// Default the name to the basename of the binary
	name := filepath.Base(path)

	// File a request against core to enable the plugin
	req := &logical.Request{
		Operation:   logical.UpdateOperation,
		ClientToken: token,
		Path:        fmt.Sprintf("sys/plugins/catalog/%s", name),
		Data: map[string]interface{}{
			"sha256":  sha256sum,
			"command": name,
		},
	}
	ctx := namespace.ContextWithNamespace(context.Background(), namespace.RootNamespace)
	if _, err := core.HandleRequest(ctx, req); err != nil {
		return err
	}

	return nil
}

// detectRedirect is used to attempt redirect address detection
func (c *ServerCommand) detectRedirect(detect physical.RedirectDetect,
	config *server.Config) (string, error) {
	// Get the hostname
	host, err := detect.DetectHostAddr()
	if err != nil {
		return "", err
	}

	// set [] for ipv6 addresses
	if strings.Contains(host, ":") && !strings.Contains(host, "]") {
		host = "[" + host + "]"
	}

	// Default the port and scheme
	scheme := "https"
	port := 8200

	// Attempt to detect overrides
	for _, list := range config.Listeners {
		// Only attempt TCP
		if list.Type != "tcp" {
			continue
		}

		// Check if TLS is disabled
		if val, ok := list.Config["tls_disable"]; ok {
			disable, err := parseutil.ParseBool(val)
			if err != nil {
				return "", errwrap.Wrapf("tls_disable: {{err}}", err)
			}

			if disable {
				scheme = "http"
			}
		}

		// Check for address override
		var addr string
		addrRaw, ok := list.Config["address"]
		if !ok {
			addr = "127.0.0.1:8200"
		} else {
			addr = addrRaw.(string)
		}

		// Check for localhost
		hostStr, portStr, err := net.SplitHostPort(addr)
		if err != nil {
			continue
		}
		if hostStr == "127.0.0.1" {
			host = hostStr
		}

		// Check for custom port
		listPort, err := strconv.Atoi(portStr)
		if err != nil {
			continue
		}
		port = listPort
	}

	// Build a URL
	url := &url.URL{
		Scheme: scheme,
		Host:   fmt.Sprintf("%s:%d", host, port),
	}

	// Return the URL string
	return url.String(), nil
}

// setupTelemetry is used to setup the telemetry sub-systems and returns the in-memory sink to be used in http configuration
func (c *ServerCommand) setupTelemetry(config *server.Config) (*metricsutil.MetricsHelper, error) {
	/* Setup telemetry
	Aggregate on 10 second intervals for 1 minute. Expose the
	metrics over stderr when there is a SIGUSR1 received.
	*/
	inm := metrics.NewInmemSink(10*time.Second, time.Minute)
	metrics.DefaultInmemSignal(inm)

	var telConfig *server.Telemetry
	if config.Telemetry != nil {
		telConfig = config.Telemetry
	} else {
		telConfig = &server.Telemetry{}
	}

	metricsConf := metrics.DefaultConfig("vault")
	metricsConf.EnableHostname = !telConfig.DisableHostname

	// Configure the statsite sink
	var fanout metrics.FanoutSink
	var prometheusEnabled bool

	// Configure the Prometheus sink
	if telConfig.PrometheusRetentionTime != 0 {
		prometheusEnabled = true
		prometheusOpts := prometheus.PrometheusOpts{
			Expiration: telConfig.PrometheusRetentionTime,
		}

		sink, err := prometheus.NewPrometheusSinkFrom(prometheusOpts)
		if err != nil {
			return nil, err
		}
		fanout = append(fanout, sink)
	}

	metricHelper := metricsutil.NewMetricsHelper(inm, prometheusEnabled)

	if telConfig.StatsiteAddr != "" {
		sink, err := metrics.NewStatsiteSink(telConfig.StatsiteAddr)
		if err != nil {
			return nil, err
		}
		fanout = append(fanout, sink)
	}

	// Configure the statsd sink
	if telConfig.StatsdAddr != "" {
		sink, err := metrics.NewStatsdSink(telConfig.StatsdAddr)
		if err != nil {
			return nil, err
		}
		fanout = append(fanout, sink)
	}

	// Configure the Circonus sink
	if telConfig.CirconusAPIToken != "" || telConfig.CirconusCheckSubmissionURL != "" {
		cfg := &circonus.Config{}
		cfg.Interval = telConfig.CirconusSubmissionInterval
		cfg.CheckManager.API.TokenKey = telConfig.CirconusAPIToken
		cfg.CheckManager.API.TokenApp = telConfig.CirconusAPIApp
		cfg.CheckManager.API.URL = telConfig.CirconusAPIURL
		cfg.CheckManager.Check.SubmissionURL = telConfig.CirconusCheckSubmissionURL
		cfg.CheckManager.Check.ID = telConfig.CirconusCheckID
		cfg.CheckManager.Check.ForceMetricActivation = telConfig.CirconusCheckForceMetricActivation
		cfg.CheckManager.Check.InstanceID = telConfig.CirconusCheckInstanceID
		cfg.CheckManager.Check.SearchTag = telConfig.CirconusCheckSearchTag
		cfg.CheckManager.Check.DisplayName = telConfig.CirconusCheckDisplayName
		cfg.CheckManager.Check.Tags = telConfig.CirconusCheckTags
		cfg.CheckManager.Broker.ID = telConfig.CirconusBrokerID
		cfg.CheckManager.Broker.SelectTag = telConfig.CirconusBrokerSelectTag

		if cfg.CheckManager.API.TokenApp == "" {
			cfg.CheckManager.API.TokenApp = "vault"
		}

		if cfg.CheckManager.Check.DisplayName == "" {
			cfg.CheckManager.Check.DisplayName = "Vault"
		}

		if cfg.CheckManager.Check.SearchTag == "" {
			cfg.CheckManager.Check.SearchTag = "service:vault"
		}

		sink, err := circonus.NewCirconusSink(cfg)
		if err != nil {
			return nil, err
		}
		sink.Start()
		fanout = append(fanout, sink)
	}

	if telConfig.DogStatsDAddr != "" {
		var tags []string

		if telConfig.DogStatsDTags != nil {
			tags = telConfig.DogStatsDTags
		}

		sink, err := datadog.NewDogStatsdSink(telConfig.DogStatsDAddr, metricsConf.HostName)
		if err != nil {
			return nil, errwrap.Wrapf("failed to start DogStatsD sink: {{err}}", err)
		}
		sink.SetTags(tags)
		fanout = append(fanout, sink)
	}

	// Configure the stackdriver sink
	if telConfig.StackdriverProjectID != "" {
		client, err := monitoring.NewMetricClient(context.Background(), option.WithUserAgent(useragent.String()))
		if err != nil {
			return nil, fmt.Errorf("Failed to create stackdriver client: %v", err)
		}
		sink := stackdriver.NewSink(client, &stackdriver.Config{
			ProjectID: telConfig.StackdriverProjectID,
			Location:  telConfig.StackdriverLocation,
			Namespace: telConfig.StackdriverNamespace,
		})
		fanout = append(fanout, sink)
	}

	// Initialize the global sink
	if len(fanout) > 1 {
		// Hostname enabled will create poor quality metrics name for prometheus
		if !telConfig.DisableHostname {
			c.UI.Warn("telemetry.disable_hostname has been set to false. Recommended setting is true for Prometheus to avoid poorly named metrics.")
		}
	} else {
		metricsConf.EnableHostname = false
	}
	fanout = append(fanout, inm)
	_, err := metrics.NewGlobal(metricsConf, fanout)

	if err != nil {
		return nil, err
	}

	return metricHelper, nil
}

func (c *ServerCommand) Reload(lock *sync.RWMutex, reloadFuncs *map[string][]reload.ReloadFunc, configPath []string) error {
	lock.RLock()
	defer lock.RUnlock()

	var reloadErrors *multierror.Error

	for k, relFuncs := range *reloadFuncs {
		switch {
		case strings.HasPrefix(k, "listener|"):
			for _, relFunc := range relFuncs {
				if relFunc != nil {
					if err := relFunc(nil); err != nil {
						reloadErrors = multierror.Append(reloadErrors, errwrap.Wrapf("error encountered reloading listener: {{err}}", err))
					}
				}
			}

		case strings.HasPrefix(k, "audit_file|"):
			for _, relFunc := range relFuncs {
				if relFunc != nil {
					if err := relFunc(nil); err != nil {
						reloadErrors = multierror.Append(reloadErrors, errwrap.Wrapf(fmt.Sprintf("error encountered reloading file audit device at path %q: {{err}}", strings.TrimPrefix(k, "audit_file|")), err))
					}
				}
			}
		}
	}

	// Send a message that we reloaded. This prevents "guessing" sleep times
	// in tests.
	select {
	case c.reloadedCh <- struct{}{}:
	default:
	}

	return reloadErrors.ErrorOrNil()
}

// storePidFile is used to write out our PID to a file if necessary
func (c *ServerCommand) storePidFile(pidPath string) error {
	// Quit fast if no pidfile
	if pidPath == "" {
		return nil
	}

	// Open the PID file
	pidFile, err := os.OpenFile(pidPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
	if err != nil {
		return errwrap.Wrapf("could not open pid file: {{err}}", err)
	}
	defer pidFile.Close()

	// Write out the PID
	pid := os.Getpid()
	_, err = pidFile.WriteString(fmt.Sprintf("%d", pid))
	if err != nil {
		return errwrap.Wrapf("could not write to pid file: {{err}}", err)
	}
	return nil
}

// removePidFile is used to cleanup the PID file if necessary
func (c *ServerCommand) removePidFile(pidPath string) error {
	if pidPath == "" {
		return nil
	}
	return os.Remove(pidPath)
}

// storageMigrationActive checks and warns against in-progress storage migrations.
// This function will block until storage is available.
func (c *ServerCommand) storageMigrationActive(backend physical.Backend) bool {
	first := true

	for {
		migrationStatus, err := CheckStorageMigration(backend)
		if err == nil {
			if migrationStatus != nil {
				startTime := migrationStatus.Start.Format(time.RFC3339)
				c.UI.Error(wrapAtLength(fmt.Sprintf("ERROR! Storage migration in progress (started: %s). "+
					"Server startup is prevented until the migration completes. Use 'vault operator migrate -reset' "+
					"to force clear the migration lock.", startTime)))
				return true
			}
			return false
		}
		if first {
			first = false
			c.UI.Warn("\nWARNING! Unable to read storage migration status.")

			// unexpected state, so stop buffering log messages
			c.logGate.Flush()
		}
		c.logger.Warn("storage migration check error", "error", err.Error())

		select {
		case <-time.After(2 * time.Second):
		case <-c.ShutdownCh:
			return true
		}
	}
}

type StorageMigrationStatus struct {
	Start time.Time `json:"start"`
}

func CheckStorageMigration(b physical.Backend) (*StorageMigrationStatus, error) {
	entry, err := b.Get(context.Background(), storageMigrationLock)

	if err != nil {
		return nil, err
	}

	if entry == nil {
		return nil, nil
	}

	var status StorageMigrationStatus
	if err := jsonutil.DecodeJSON(entry.Value, &status); err != nil {
		return nil, err
	}

	return &status, nil
}

func SetStorageMigration(b physical.Backend, active bool) error {
	if !active {
		return b.Delete(context.Background(), storageMigrationLock)
	}

	status := StorageMigrationStatus{
		Start: time.Now(),
	}

	enc, err := jsonutil.EncodeJSON(status)
	if err != nil {
		return err
	}

	entry := &physical.Entry{
		Key:   storageMigrationLock,
		Value: enc,
	}

	return b.Put(context.Background(), entry)
}

type grpclogFaker struct {
	logger log.Logger
	log    bool
}

func (g *grpclogFaker) Fatal(args ...interface{}) {
	g.logger.Error(fmt.Sprint(args...))
	os.Exit(1)
}

func (g *grpclogFaker) Fatalf(format string, args ...interface{}) {
	g.logger.Error(fmt.Sprintf(format, args...))
	os.Exit(1)
}

func (g *grpclogFaker) Fatalln(args ...interface{}) {
	g.logger.Error(fmt.Sprintln(args...))
	os.Exit(1)
}

func (g *grpclogFaker) Print(args ...interface{}) {
	if g.log && g.logger.IsDebug() {
		g.logger.Debug(fmt.Sprint(args...))
	}
}

func (g *grpclogFaker) Printf(format string, args ...interface{}) {
	if g.log && g.logger.IsDebug() {
		g.logger.Debug(fmt.Sprintf(format, args...))
	}
}

func (g *grpclogFaker) Println(args ...interface{}) {
	if g.log && g.logger.IsDebug() {
		g.logger.Debug(fmt.Sprintln(args...))
	}
}