1012 lines
32 KiB
Go
1012 lines
32 KiB
Go
package agent
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import (
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"flag"
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"fmt"
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"io"
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"net"
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"os"
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"os/signal"
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"path/filepath"
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"regexp"
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"runtime"
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"strings"
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"syscall"
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"time"
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"github.com/armon/go-metrics"
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"github.com/armon/go-metrics/datadog"
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"github.com/hashicorp/consul/lib"
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"github.com/hashicorp/consul/watch"
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"github.com/hashicorp/go-checkpoint"
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"github.com/hashicorp/go-reap"
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"github.com/hashicorp/go-syslog"
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"github.com/hashicorp/logutils"
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scada "github.com/hashicorp/scada-client"
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"github.com/mitchellh/cli"
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)
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// gracefulTimeout controls how long we wait before forcefully terminating
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var gracefulTimeout = 5 * time.Second
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// validDatacenter is used to validate a datacenter
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var validDatacenter = regexp.MustCompile("^[a-zA-Z0-9_-]+$")
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// Command is a Command implementation that runs a Consul agent.
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// The command will not end unless a shutdown message is sent on the
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// ShutdownCh. If two messages are sent on the ShutdownCh it will forcibly
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// exit.
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type Command struct {
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Revision string
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Version string
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VersionPrerelease string
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Ui cli.Ui
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ShutdownCh <-chan struct{}
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args []string
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logFilter *logutils.LevelFilter
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logOutput io.Writer
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agent *Agent
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rpcServer *AgentRPC
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httpServers []*HTTPServer
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dnsServer *DNSServer
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scadaProvider *scada.Provider
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scadaHttp *HTTPServer
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}
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// readConfig is responsible for setup of our configuration using
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// the command line and any file configs
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func (c *Command) readConfig() *Config {
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var cmdConfig Config
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var configFiles []string
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var retryInterval string
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var retryIntervalWan string
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var dnsRecursors []string
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var dev bool
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cmdFlags := flag.NewFlagSet("agent", flag.ContinueOnError)
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cmdFlags.Usage = func() { c.Ui.Output(c.Help()) }
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cmdFlags.Var((*AppendSliceValue)(&configFiles), "config-file", "json file to read config from")
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cmdFlags.Var((*AppendSliceValue)(&configFiles), "config-dir", "directory of json files to read")
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cmdFlags.Var((*AppendSliceValue)(&dnsRecursors), "recursor", "address of an upstream DNS server")
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cmdFlags.BoolVar(&dev, "dev", false, "development server mode")
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cmdFlags.StringVar(&cmdConfig.LogLevel, "log-level", "", "log level")
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cmdFlags.StringVar(&cmdConfig.NodeName, "node", "", "node name")
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cmdFlags.StringVar(&cmdConfig.Datacenter, "dc", "", "node datacenter")
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cmdFlags.StringVar(&cmdConfig.DataDir, "data-dir", "", "path to the data directory")
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cmdFlags.BoolVar(&cmdConfig.EnableUi, "ui", false, "enable the built-in web UI")
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cmdFlags.StringVar(&cmdConfig.UiDir, "ui-dir", "", "path to the web UI directory")
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cmdFlags.StringVar(&cmdConfig.PidFile, "pid-file", "", "path to file to store PID")
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cmdFlags.StringVar(&cmdConfig.EncryptKey, "encrypt", "", "gossip encryption key")
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cmdFlags.BoolVar(&cmdConfig.Server, "server", false, "run agent as server")
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cmdFlags.BoolVar(&cmdConfig.Bootstrap, "bootstrap", false, "enable server bootstrap mode")
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cmdFlags.IntVar(&cmdConfig.BootstrapExpect, "bootstrap-expect", 0, "enable automatic bootstrap via expect mode")
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cmdFlags.StringVar(&cmdConfig.Domain, "domain", "", "domain to use for DNS interface")
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cmdFlags.StringVar(&cmdConfig.ClientAddr, "client", "", "address to bind client listeners to (DNS, HTTP, HTTPS, RPC)")
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cmdFlags.StringVar(&cmdConfig.BindAddr, "bind", "", "address to bind server listeners to")
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cmdFlags.IntVar(&cmdConfig.Ports.HTTP, "http-port", 0, "http port to use")
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cmdFlags.StringVar(&cmdConfig.AdvertiseAddr, "advertise", "", "address to advertise instead of bind addr")
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cmdFlags.StringVar(&cmdConfig.AdvertiseAddrWan, "advertise-wan", "", "address to advertise on wan instead of bind or advertise addr")
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cmdFlags.StringVar(&cmdConfig.AtlasInfrastructure, "atlas", "", "infrastructure name in Atlas")
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cmdFlags.StringVar(&cmdConfig.AtlasToken, "atlas-token", "", "authentication token for Atlas")
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cmdFlags.BoolVar(&cmdConfig.AtlasJoin, "atlas-join", false, "auto-join with Atlas")
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cmdFlags.StringVar(&cmdConfig.AtlasEndpoint, "atlas-endpoint", "", "endpoint for Atlas integration")
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cmdFlags.IntVar(&cmdConfig.Protocol, "protocol", -1, "protocol version")
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cmdFlags.BoolVar(&cmdConfig.EnableSyslog, "syslog", false,
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"enable logging to syslog facility")
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cmdFlags.BoolVar(&cmdConfig.RejoinAfterLeave, "rejoin", false,
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"enable re-joining after a previous leave")
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cmdFlags.Var((*AppendSliceValue)(&cmdConfig.StartJoin), "join",
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"address of agent to join on startup")
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cmdFlags.Var((*AppendSliceValue)(&cmdConfig.StartJoinWan), "join-wan",
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"address of agent to join -wan on startup")
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cmdFlags.Var((*AppendSliceValue)(&cmdConfig.RetryJoin), "retry-join",
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"address of agent to join on startup with retry")
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cmdFlags.IntVar(&cmdConfig.RetryMaxAttempts, "retry-max", 0,
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"number of retries for joining")
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cmdFlags.StringVar(&retryInterval, "retry-interval", "",
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"interval between join attempts")
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cmdFlags.Var((*AppendSliceValue)(&cmdConfig.RetryJoinWan), "retry-join-wan",
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"address of agent to join -wan on startup with retry")
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cmdFlags.IntVar(&cmdConfig.RetryMaxAttemptsWan, "retry-max-wan", 0,
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"number of retries for joining -wan")
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cmdFlags.StringVar(&retryIntervalWan, "retry-interval-wan", "",
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"interval between join -wan attempts")
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if err := cmdFlags.Parse(c.args); err != nil {
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return nil
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}
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if retryInterval != "" {
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dur, err := time.ParseDuration(retryInterval)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error: %s", err))
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return nil
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}
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cmdConfig.RetryInterval = dur
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}
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if retryIntervalWan != "" {
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dur, err := time.ParseDuration(retryIntervalWan)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error: %s", err))
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return nil
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}
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cmdConfig.RetryIntervalWan = dur
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}
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var config *Config
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if dev {
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config = DevConfig()
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} else {
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config = DefaultConfig()
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}
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if len(configFiles) > 0 {
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fileConfig, err := ReadConfigPaths(configFiles)
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if err != nil {
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c.Ui.Error(err.Error())
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return nil
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}
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config = MergeConfig(config, fileConfig)
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}
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cmdConfig.DNSRecursors = append(cmdConfig.DNSRecursors, dnsRecursors...)
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config = MergeConfig(config, &cmdConfig)
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if config.NodeName == "" {
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hostname, err := os.Hostname()
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error determining hostname: %s", err))
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return nil
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}
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config.NodeName = hostname
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}
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// Ensure we have a data directory
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if config.DataDir == "" && !dev {
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c.Ui.Error("Must specify data directory using -data-dir")
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return nil
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}
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// Check the data dir for signs of an un-migrated Consul 0.5.x or older
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// server. Consul refuses to start if this is present to protect a server
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// with existing data from starting on a fresh data set.
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if config.Server {
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mdbPath := filepath.Join(config.DataDir, "mdb")
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if _, err := os.Stat(mdbPath); !os.IsNotExist(err) {
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c.Ui.Error(fmt.Sprintf("CRITICAL: Deprecated data folder found at %q!", mdbPath))
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c.Ui.Error("Consul will refuse to boot with this directory present.")
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c.Ui.Error("See https://www.consul.io/docs/upgrade-specific.html for more information.")
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return nil
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}
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}
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if config.EncryptKey != "" {
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if _, err := config.EncryptBytes(); err != nil {
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c.Ui.Error(fmt.Sprintf("Invalid encryption key: %s", err))
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return nil
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}
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keyfileLAN := filepath.Join(config.DataDir, serfLANKeyring)
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if _, err := os.Stat(keyfileLAN); err == nil {
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c.Ui.Error("WARNING: LAN keyring exists but -encrypt given, using keyring")
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}
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if config.Server {
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keyfileWAN := filepath.Join(config.DataDir, serfWANKeyring)
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if _, err := os.Stat(keyfileWAN); err == nil {
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c.Ui.Error("WARNING: WAN keyring exists but -encrypt given, using keyring")
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}
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}
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}
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// Ensure the datacenter is always lowercased. The DNS endpoints automatically
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// lowercase all queries, and internally we expect DC1 and dc1 to be the same.
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config.Datacenter = strings.ToLower(config.Datacenter)
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// Verify datacenter is valid
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if !validDatacenter.MatchString(config.Datacenter) {
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c.Ui.Error("Datacenter must be alpha-numeric with underscores and hypens only")
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return nil
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}
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// Only allow bootstrap mode when acting as a server
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if config.Bootstrap && !config.Server {
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c.Ui.Error("Bootstrap mode cannot be enabled when server mode is not enabled")
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return nil
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}
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// Expect can only work when acting as a server
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if config.BootstrapExpect != 0 && !config.Server {
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c.Ui.Error("Expect mode cannot be enabled when server mode is not enabled")
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return nil
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}
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// Expect & Bootstrap are mutually exclusive
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if config.BootstrapExpect != 0 && config.Bootstrap {
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c.Ui.Error("Bootstrap cannot be provided with an expected server count")
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return nil
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}
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// Compile all the watches
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for _, params := range config.Watches {
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// Parse the watches, excluding the handler
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wp, err := watch.ParseExempt(params, []string{"handler"})
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to parse watch (%#v): %v", params, err))
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return nil
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}
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// Get the handler
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if err := verifyWatchHandler(wp.Exempt["handler"]); err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to setup watch handler (%#v): %v", params, err))
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return nil
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}
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// Store the watch plan
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config.WatchPlans = append(config.WatchPlans, wp)
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}
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// Warn if we are in expect mode
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if config.BootstrapExpect == 1 {
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c.Ui.Error("WARNING: BootstrapExpect Mode is specified as 1; this is the same as Bootstrap mode.")
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config.BootstrapExpect = 0
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config.Bootstrap = true
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} else if config.BootstrapExpect > 0 {
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c.Ui.Error(fmt.Sprintf("WARNING: Expect Mode enabled, expecting %d servers", config.BootstrapExpect))
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}
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// Warn if we are in bootstrap mode
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if config.Bootstrap {
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c.Ui.Error("WARNING: Bootstrap mode enabled! Do not enable unless necessary")
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}
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// Warn if using windows as a server
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if config.Server && runtime.GOOS == "windows" {
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c.Ui.Error("WARNING: Windows is not recommended as a Consul server. Do not use in production.")
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}
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// Set the version info
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config.Revision = c.Revision
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config.Version = c.Version
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config.VersionPrerelease = c.VersionPrerelease
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return config
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}
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// setupLoggers is used to setup the logGate, logWriter, and our logOutput
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func (c *Command) setupLoggers(config *Config) (*GatedWriter, *logWriter, io.Writer) {
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// Setup logging. First create the gated log writer, which will
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// store logs until we're ready to show them. Then create the level
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// filter, filtering logs of the specified level.
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logGate := &GatedWriter{
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Writer: &cli.UiWriter{Ui: c.Ui},
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}
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c.logFilter = LevelFilter()
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c.logFilter.MinLevel = logutils.LogLevel(strings.ToUpper(config.LogLevel))
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c.logFilter.Writer = logGate
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if !ValidateLevelFilter(c.logFilter.MinLevel, c.logFilter) {
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c.Ui.Error(fmt.Sprintf(
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"Invalid log level: %s. Valid log levels are: %v",
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c.logFilter.MinLevel, c.logFilter.Levels))
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return nil, nil, nil
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}
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// Check if syslog is enabled
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var syslog io.Writer
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if config.EnableSyslog {
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l, err := gsyslog.NewLogger(gsyslog.LOG_NOTICE, config.SyslogFacility, "consul")
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Syslog setup failed: %v", err))
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return nil, nil, nil
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}
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syslog = &SyslogWrapper{l, c.logFilter}
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}
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// Create a log writer, and wrap a logOutput around it
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logWriter := NewLogWriter(512)
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var logOutput io.Writer
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if syslog != nil {
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logOutput = io.MultiWriter(c.logFilter, logWriter, syslog)
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} else {
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logOutput = io.MultiWriter(c.logFilter, logWriter)
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}
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c.logOutput = logOutput
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return logGate, logWriter, logOutput
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}
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// setupAgent is used to start the agent and various interfaces
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func (c *Command) setupAgent(config *Config, logOutput io.Writer, logWriter *logWriter) error {
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c.Ui.Output("Starting Consul agent...")
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agent, err := Create(config, logOutput)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error starting agent: %s", err))
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return err
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}
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c.agent = agent
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// Setup the RPC listener
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rpcAddr, err := config.ClientListener(config.Addresses.RPC, config.Ports.RPC)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Invalid RPC bind address: %s", err))
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return err
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}
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// Clear the domain socket file if it exists
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socketPath, isSocket := unixSocketAddr(config.Addresses.RPC)
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if isSocket {
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if _, err := os.Stat(socketPath); !os.IsNotExist(err) {
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agent.logger.Printf("[WARN] agent: Replacing socket %q", socketPath)
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}
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if err := os.Remove(socketPath); err != nil && !os.IsNotExist(err) {
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c.Ui.Output(fmt.Sprintf("Error removing socket file: %s", err))
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return err
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}
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}
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rpcListener, err := net.Listen(rpcAddr.Network(), rpcAddr.String())
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if err != nil {
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agent.Shutdown()
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c.Ui.Error(fmt.Sprintf("Error starting RPC listener: %s", err))
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return err
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}
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// Set up ownership/permission bits on the socket file
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if isSocket {
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if err := setFilePermissions(socketPath, config.UnixSockets); err != nil {
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agent.Shutdown()
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c.Ui.Error(fmt.Sprintf("Error setting up socket: %s", err))
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return err
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}
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}
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// Start the IPC layer
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c.Ui.Output("Starting Consul agent RPC...")
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c.rpcServer = NewAgentRPC(agent, rpcListener, logOutput, logWriter)
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// Enable the SCADA integration
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if err := c.setupScadaConn(config); err != nil {
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agent.Shutdown()
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c.Ui.Error(fmt.Sprintf("Error starting SCADA connection: %s", err))
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return err
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}
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if config.Ports.HTTP > 0 || config.Ports.HTTPS > 0 {
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servers, err := NewHTTPServers(agent, config, logOutput)
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if err != nil {
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agent.Shutdown()
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c.Ui.Error(fmt.Sprintf("Error starting http servers: %s", err))
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return err
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}
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c.httpServers = servers
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}
|
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|
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if config.Ports.DNS > 0 {
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dnsAddr, err := config.ClientListener(config.Addresses.DNS, config.Ports.DNS)
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if err != nil {
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agent.Shutdown()
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c.Ui.Error(fmt.Sprintf("Invalid DNS bind address: %s", err))
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return err
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}
|
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server, err := NewDNSServer(agent, &config.DNSConfig, logOutput,
|
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config.Domain, dnsAddr.String(), config.DNSRecursors)
|
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if err != nil {
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agent.Shutdown()
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c.Ui.Error(fmt.Sprintf("Error starting dns server: %s", err))
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return err
|
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}
|
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c.dnsServer = server
|
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}
|
|
|
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// Setup update checking
|
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if !config.DisableUpdateCheck {
|
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version := config.Version
|
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if config.VersionPrerelease != "" {
|
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version += fmt.Sprintf("-%s", config.VersionPrerelease)
|
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}
|
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updateParams := &checkpoint.CheckParams{
|
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Product: "consul",
|
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Version: version,
|
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}
|
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if !config.DisableAnonymousSignature {
|
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updateParams.SignatureFile = filepath.Join(config.DataDir, "checkpoint-signature")
|
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}
|
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|
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// Schedule a periodic check with expected interval of 24 hours
|
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checkpoint.CheckInterval(updateParams, 24*time.Hour, c.checkpointResults)
|
|
|
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// Do an immediate check within the next 30 seconds
|
|
go func() {
|
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time.Sleep(lib.RandomStagger(30 * time.Second))
|
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c.checkpointResults(checkpoint.Check(updateParams))
|
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}()
|
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}
|
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return nil
|
|
}
|
|
|
|
// checkpointResults is used to handler periodic results from our update checker
|
|
func (c *Command) checkpointResults(results *checkpoint.CheckResponse, err error) {
|
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if err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed to check for updates: %v", err))
|
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return
|
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}
|
|
if results.Outdated {
|
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c.Ui.Error(fmt.Sprintf("Newer Consul version available: %s", results.CurrentVersion))
|
|
}
|
|
for _, alert := range results.Alerts {
|
|
switch alert.Level {
|
|
case "info":
|
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c.Ui.Info(fmt.Sprintf("Bulletin [%s]: %s (%s)", alert.Level, alert.Message, alert.URL))
|
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default:
|
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c.Ui.Error(fmt.Sprintf("Bulletin [%s]: %s (%s)", alert.Level, alert.Message, alert.URL))
|
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}
|
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}
|
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}
|
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|
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// startupJoin is invoked to handle any joins specified to take place at start time
|
|
func (c *Command) startupJoin(config *Config) error {
|
|
if len(config.StartJoin) == 0 {
|
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return nil
|
|
}
|
|
|
|
c.Ui.Output("Joining cluster...")
|
|
n, err := c.agent.JoinLAN(config.StartJoin)
|
|
if err != nil {
|
|
return err
|
|
}
|
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|
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c.Ui.Info(fmt.Sprintf("Join completed. Synced with %d initial agents", n))
|
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return nil
|
|
}
|
|
|
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// startupJoinWan is invoked to handle any joins -wan specified to take place at start time
|
|
func (c *Command) startupJoinWan(config *Config) error {
|
|
if len(config.StartJoinWan) == 0 {
|
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return nil
|
|
}
|
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|
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c.Ui.Output("Joining -wan cluster...")
|
|
n, err := c.agent.JoinWAN(config.StartJoinWan)
|
|
if err != nil {
|
|
return err
|
|
}
|
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|
|
c.Ui.Info(fmt.Sprintf("Join -wan completed. Synced with %d initial agents", n))
|
|
return nil
|
|
}
|
|
|
|
// retryJoin is used to handle retrying a join until it succeeds or all
|
|
// retries are exhausted.
|
|
func (c *Command) retryJoin(config *Config, errCh chan<- struct{}) {
|
|
if len(config.RetryJoin) == 0 {
|
|
return
|
|
}
|
|
|
|
logger := c.agent.logger
|
|
logger.Printf("[INFO] agent: Joining cluster...")
|
|
|
|
attempt := 0
|
|
for {
|
|
n, err := c.agent.JoinLAN(config.RetryJoin)
|
|
if err == nil {
|
|
logger.Printf("[INFO] agent: Join completed. Synced with %d initial agents", n)
|
|
return
|
|
}
|
|
|
|
attempt++
|
|
if config.RetryMaxAttempts > 0 && attempt > config.RetryMaxAttempts {
|
|
logger.Printf("[ERROR] agent: max join retry exhausted, exiting")
|
|
close(errCh)
|
|
return
|
|
}
|
|
|
|
logger.Printf("[WARN] agent: Join failed: %v, retrying in %v", err,
|
|
config.RetryInterval)
|
|
time.Sleep(config.RetryInterval)
|
|
}
|
|
}
|
|
|
|
// retryJoinWan is used to handle retrying a join -wan until it succeeds or all
|
|
// retries are exhausted.
|
|
func (c *Command) retryJoinWan(config *Config, errCh chan<- struct{}) {
|
|
if len(config.RetryJoinWan) == 0 {
|
|
return
|
|
}
|
|
|
|
logger := c.agent.logger
|
|
logger.Printf("[INFO] agent: Joining WAN cluster...")
|
|
|
|
attempt := 0
|
|
for {
|
|
n, err := c.agent.JoinWAN(config.RetryJoinWan)
|
|
if err == nil {
|
|
logger.Printf("[INFO] agent: Join -wan completed. Synced with %d initial agents", n)
|
|
return
|
|
}
|
|
|
|
attempt++
|
|
if config.RetryMaxAttemptsWan > 0 && attempt > config.RetryMaxAttemptsWan {
|
|
logger.Printf("[ERROR] agent: max join -wan retry exhausted, exiting")
|
|
close(errCh)
|
|
return
|
|
}
|
|
|
|
logger.Printf("[WARN] agent: Join -wan failed: %v, retrying in %v", err,
|
|
config.RetryIntervalWan)
|
|
time.Sleep(config.RetryIntervalWan)
|
|
}
|
|
}
|
|
|
|
// gossipEncrypted determines if the consul instance is using symmetric
|
|
// encryption keys to protect gossip protocol messages.
|
|
func (c *Command) gossipEncrypted() bool {
|
|
if c.agent.config.EncryptKey != "" {
|
|
return true
|
|
}
|
|
|
|
server := c.agent.server
|
|
if server != nil {
|
|
return server.KeyManagerLAN() != nil || server.KeyManagerWAN() != nil
|
|
}
|
|
|
|
client := c.agent.client
|
|
return client != nil && client.KeyManagerLAN() != nil
|
|
}
|
|
|
|
func (c *Command) Run(args []string) int {
|
|
c.Ui = &cli.PrefixedUi{
|
|
OutputPrefix: "==> ",
|
|
InfoPrefix: " ",
|
|
ErrorPrefix: "==> ",
|
|
Ui: c.Ui,
|
|
}
|
|
|
|
// Parse our configs
|
|
c.args = args
|
|
config := c.readConfig()
|
|
if config == nil {
|
|
return 1
|
|
}
|
|
|
|
// Setup the log outputs
|
|
logGate, logWriter, logOutput := c.setupLoggers(config)
|
|
if logWriter == nil {
|
|
return 1
|
|
}
|
|
|
|
/* 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)
|
|
metricsConf := metrics.DefaultConfig(config.Telemetry.StatsitePrefix)
|
|
metricsConf.EnableHostname = !config.Telemetry.DisableHostname
|
|
|
|
// Configure the statsite sink
|
|
var fanout metrics.FanoutSink
|
|
if config.Telemetry.StatsiteAddr != "" {
|
|
sink, err := metrics.NewStatsiteSink(config.Telemetry.StatsiteAddr)
|
|
if err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed to start statsite sink. Got: %s", err))
|
|
return 1
|
|
}
|
|
fanout = append(fanout, sink)
|
|
}
|
|
|
|
// Configure the statsd sink
|
|
if config.Telemetry.StatsdAddr != "" {
|
|
sink, err := metrics.NewStatsdSink(config.Telemetry.StatsdAddr)
|
|
if err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed to start statsd sink. Got: %s", err))
|
|
return 1
|
|
}
|
|
fanout = append(fanout, sink)
|
|
}
|
|
|
|
// Configure the DogStatsd sink
|
|
if config.Telemetry.DogStatsdAddr != "" {
|
|
var tags []string
|
|
|
|
if config.Telemetry.DogStatsdTags != nil {
|
|
tags = config.Telemetry.DogStatsdTags
|
|
}
|
|
|
|
sink, err := datadog.NewDogStatsdSink(config.Telemetry.DogStatsdAddr, metricsConf.HostName)
|
|
if err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed to start DogStatsd sink. Got: %s", err))
|
|
return 1
|
|
}
|
|
sink.SetTags(tags)
|
|
fanout = append(fanout, sink)
|
|
}
|
|
|
|
// Initialize the global sink
|
|
if len(fanout) > 0 {
|
|
fanout = append(fanout, inm)
|
|
metrics.NewGlobal(metricsConf, fanout)
|
|
} else {
|
|
metricsConf.EnableHostname = false
|
|
metrics.NewGlobal(metricsConf, inm)
|
|
}
|
|
|
|
// Create the agent
|
|
if err := c.setupAgent(config, logOutput, logWriter); err != nil {
|
|
return 1
|
|
}
|
|
defer c.agent.Shutdown()
|
|
if c.rpcServer != nil {
|
|
defer c.rpcServer.Shutdown()
|
|
}
|
|
if c.dnsServer != nil {
|
|
defer c.dnsServer.Shutdown()
|
|
}
|
|
for _, server := range c.httpServers {
|
|
defer server.Shutdown()
|
|
}
|
|
|
|
// Enable child process reaping
|
|
if (config.Reap != nil && *config.Reap) || (config.Reap == nil && os.Getpid() == 1) {
|
|
if !reap.IsSupported() {
|
|
c.Ui.Error("Child process reaping is not supported on this platform (set reap=false)")
|
|
return 1
|
|
} else {
|
|
logger := c.agent.logger
|
|
logger.Printf("[DEBUG] Automatically reaping child processes")
|
|
|
|
pids := make(reap.PidCh, 1)
|
|
errors := make(reap.ErrorCh, 1)
|
|
go func() {
|
|
for {
|
|
select {
|
|
case pid := <-pids:
|
|
logger.Printf("[DEBUG] Reaped child process %d", pid)
|
|
case err := <-errors:
|
|
logger.Printf("[ERR] Error reaping child process: %v", err)
|
|
case <-c.agent.shutdownCh:
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
go reap.ReapChildren(pids, errors, c.agent.shutdownCh, &c.agent.reapLock)
|
|
}
|
|
}
|
|
|
|
// Check and shut down the SCADA listeners at the end
|
|
defer func() {
|
|
if c.scadaHttp != nil {
|
|
c.scadaHttp.Shutdown()
|
|
}
|
|
if c.scadaProvider != nil {
|
|
c.scadaProvider.Shutdown()
|
|
}
|
|
}()
|
|
|
|
// Join startup nodes if specified
|
|
if err := c.startupJoin(config); err != nil {
|
|
c.Ui.Error(err.Error())
|
|
return 1
|
|
}
|
|
|
|
// Join startup nodes if specified
|
|
if err := c.startupJoinWan(config); err != nil {
|
|
c.Ui.Error(err.Error())
|
|
return 1
|
|
}
|
|
|
|
// Get the new client http listener addr
|
|
httpAddr, err := config.ClientListener(config.Addresses.HTTP, config.Ports.HTTP)
|
|
if err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed to determine HTTP address: %v", err))
|
|
}
|
|
|
|
// Register the watches
|
|
for _, wp := range config.WatchPlans {
|
|
go func(wp *watch.WatchPlan) {
|
|
wp.Handler = makeWatchHandler(logOutput, wp.Exempt["handler"], &c.agent.reapLock)
|
|
wp.LogOutput = c.logOutput
|
|
if err := wp.Run(httpAddr.String()); err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Error running watch: %v", err))
|
|
}
|
|
}(wp)
|
|
}
|
|
|
|
// Figure out if gossip is encrypted
|
|
var gossipEncrypted bool
|
|
if config.Server {
|
|
gossipEncrypted = c.agent.server.Encrypted()
|
|
} else {
|
|
gossipEncrypted = c.agent.client.Encrypted()
|
|
}
|
|
|
|
// Determine the Atlas cluster
|
|
atlas := "<disabled>"
|
|
if config.AtlasInfrastructure != "" {
|
|
atlas = fmt.Sprintf("(Infrastructure: '%s' Join: %v)", config.AtlasInfrastructure, config.AtlasJoin)
|
|
}
|
|
|
|
// Let the agent know we've finished registration
|
|
c.agent.StartSync()
|
|
|
|
c.Ui.Output("Consul agent running!")
|
|
c.Ui.Info(fmt.Sprintf(" Node name: '%s'", config.NodeName))
|
|
c.Ui.Info(fmt.Sprintf(" Datacenter: '%s'", config.Datacenter))
|
|
c.Ui.Info(fmt.Sprintf(" Server: %v (bootstrap: %v)", config.Server, config.Bootstrap))
|
|
c.Ui.Info(fmt.Sprintf(" Client Addr: %v (HTTP: %d, HTTPS: %d, DNS: %d, RPC: %d)", config.ClientAddr,
|
|
config.Ports.HTTP, config.Ports.HTTPS, config.Ports.DNS, config.Ports.RPC))
|
|
c.Ui.Info(fmt.Sprintf(" Cluster Addr: %v (LAN: %d, WAN: %d)", config.AdvertiseAddr,
|
|
config.Ports.SerfLan, config.Ports.SerfWan))
|
|
c.Ui.Info(fmt.Sprintf("Gossip encrypt: %v, RPC-TLS: %v, TLS-Incoming: %v",
|
|
gossipEncrypted, config.VerifyOutgoing, config.VerifyIncoming))
|
|
c.Ui.Info(fmt.Sprintf(" Atlas: %s", atlas))
|
|
|
|
// Enable log streaming
|
|
c.Ui.Info("")
|
|
c.Ui.Output("Log data will now stream in as it occurs:\n")
|
|
logGate.Flush()
|
|
|
|
// Start retry join process
|
|
errCh := make(chan struct{})
|
|
go c.retryJoin(config, errCh)
|
|
|
|
// Start retry -wan join process
|
|
errWanCh := make(chan struct{})
|
|
go c.retryJoinWan(config, errWanCh)
|
|
|
|
// Wait for exit
|
|
return c.handleSignals(config, errCh, errWanCh)
|
|
}
|
|
|
|
// handleSignals blocks until we get an exit-causing signal
|
|
func (c *Command) handleSignals(config *Config, retryJoin <-chan struct{}, retryJoinWan <-chan struct{}) int {
|
|
signalCh := make(chan os.Signal, 4)
|
|
signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP)
|
|
|
|
// Wait for a signal
|
|
WAIT:
|
|
var sig os.Signal
|
|
select {
|
|
case s := <-signalCh:
|
|
sig = s
|
|
case <-c.rpcServer.ReloadCh():
|
|
sig = syscall.SIGHUP
|
|
case <-c.ShutdownCh:
|
|
sig = os.Interrupt
|
|
case <-retryJoin:
|
|
return 1
|
|
case <-retryJoinWan:
|
|
return 1
|
|
case <-c.agent.ShutdownCh():
|
|
// Agent is already shutdown!
|
|
return 0
|
|
}
|
|
c.Ui.Output(fmt.Sprintf("Caught signal: %v", sig))
|
|
|
|
// Check if this is a SIGHUP
|
|
if sig == syscall.SIGHUP {
|
|
if conf := c.handleReload(config); conf != nil {
|
|
config = conf
|
|
}
|
|
goto WAIT
|
|
}
|
|
|
|
// Check if we should do a graceful leave
|
|
graceful := false
|
|
if sig == os.Interrupt && !config.SkipLeaveOnInt {
|
|
graceful = true
|
|
} else if sig == syscall.SIGTERM && config.LeaveOnTerm {
|
|
graceful = true
|
|
}
|
|
|
|
// Bail fast if not doing a graceful leave
|
|
if !graceful {
|
|
return 1
|
|
}
|
|
|
|
// Attempt a graceful leave
|
|
gracefulCh := make(chan struct{})
|
|
c.Ui.Output("Gracefully shutting down agent...")
|
|
go func() {
|
|
if err := c.agent.Leave(); err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Error: %s", err))
|
|
return
|
|
}
|
|
close(gracefulCh)
|
|
}()
|
|
|
|
// Wait for leave or another signal
|
|
select {
|
|
case <-signalCh:
|
|
return 1
|
|
case <-time.After(gracefulTimeout):
|
|
return 1
|
|
case <-gracefulCh:
|
|
return 0
|
|
}
|
|
}
|
|
|
|
// handleReload is invoked when we should reload our configs, e.g. SIGHUP
|
|
func (c *Command) handleReload(config *Config) *Config {
|
|
c.Ui.Output("Reloading configuration...")
|
|
newConf := c.readConfig()
|
|
if newConf == nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed to reload configs"))
|
|
return config
|
|
}
|
|
|
|
// Change the log level
|
|
minLevel := logutils.LogLevel(strings.ToUpper(newConf.LogLevel))
|
|
if ValidateLevelFilter(minLevel, c.logFilter) {
|
|
c.logFilter.SetMinLevel(minLevel)
|
|
} else {
|
|
c.Ui.Error(fmt.Sprintf(
|
|
"Invalid log level: %s. Valid log levels are: %v",
|
|
minLevel, c.logFilter.Levels))
|
|
|
|
// Keep the current log level
|
|
newConf.LogLevel = config.LogLevel
|
|
}
|
|
|
|
// Bulk update the services and checks
|
|
c.agent.PauseSync()
|
|
defer c.agent.ResumeSync()
|
|
|
|
// Snapshot the current state, and restore it afterwards
|
|
snap := c.agent.snapshotCheckState()
|
|
defer c.agent.restoreCheckState(snap)
|
|
|
|
// First unload all checks and services. This lets us begin the reload
|
|
// with a clean slate.
|
|
if err := c.agent.unloadServices(); err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed unloading services: %s", err))
|
|
return nil
|
|
}
|
|
if err := c.agent.unloadChecks(); err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed unloading checks: %s", err))
|
|
return nil
|
|
}
|
|
|
|
// Reload services and check definitions.
|
|
if err := c.agent.loadServices(newConf); err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed reloading services: %s", err))
|
|
return nil
|
|
}
|
|
if err := c.agent.loadChecks(newConf); err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed reloading checks: %s", err))
|
|
return nil
|
|
}
|
|
|
|
// Get the new client listener addr
|
|
httpAddr, err := newConf.ClientListener(config.Addresses.HTTP, config.Ports.HTTP)
|
|
if err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed to determine HTTP address: %v", err))
|
|
}
|
|
|
|
// Deregister the old watches
|
|
for _, wp := range config.WatchPlans {
|
|
wp.Stop()
|
|
}
|
|
|
|
// Register the new watches
|
|
for _, wp := range newConf.WatchPlans {
|
|
go func(wp *watch.WatchPlan) {
|
|
wp.Handler = makeWatchHandler(c.logOutput, wp.Exempt["handler"], &c.agent.reapLock)
|
|
wp.LogOutput = c.logOutput
|
|
if err := wp.Run(httpAddr.String()); err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Error running watch: %v", err))
|
|
}
|
|
}(wp)
|
|
}
|
|
|
|
// Reload SCADA client if we have a change
|
|
if newConf.AtlasInfrastructure != config.AtlasInfrastructure ||
|
|
newConf.AtlasToken != config.AtlasToken ||
|
|
newConf.AtlasEndpoint != config.AtlasEndpoint {
|
|
if err := c.setupScadaConn(newConf); err != nil {
|
|
c.Ui.Error(fmt.Sprintf("Failed reloading SCADA client: %s", err))
|
|
return nil
|
|
}
|
|
}
|
|
|
|
return newConf
|
|
}
|
|
|
|
// startScadaClient is used to start a new SCADA provider and listener,
|
|
// replacing any existing listeners.
|
|
func (c *Command) setupScadaConn(config *Config) error {
|
|
// Shut down existing SCADA listeners
|
|
if c.scadaProvider != nil {
|
|
c.scadaProvider.Shutdown()
|
|
}
|
|
if c.scadaHttp != nil {
|
|
c.scadaHttp.Shutdown()
|
|
}
|
|
|
|
// No-op if we don't have an infrastructure
|
|
if config.AtlasInfrastructure == "" {
|
|
return nil
|
|
}
|
|
|
|
// Create the new provider and listener
|
|
c.Ui.Output("Connecting to Atlas: " + config.AtlasInfrastructure)
|
|
provider, list, err := NewProvider(config, c.logOutput)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
c.scadaProvider = provider
|
|
c.scadaHttp = newScadaHttp(c.agent, list)
|
|
return nil
|
|
}
|
|
|
|
func (c *Command) Synopsis() string {
|
|
return "Runs a Consul agent"
|
|
}
|
|
|
|
func (c *Command) Help() string {
|
|
helpText := `
|
|
Usage: consul agent [options]
|
|
|
|
Starts the Consul agent and runs until an interrupt is received. The
|
|
agent represents a single node in a cluster.
|
|
|
|
Options:
|
|
|
|
-advertise=addr Sets the advertise address to use
|
|
-advertise-wan=addr Sets address to advertise on wan instead of advertise addr
|
|
-atlas=org/name Sets the Atlas infrastructure name, enables SCADA.
|
|
-atlas-join Enables auto-joining the Atlas cluster
|
|
-atlas-token=token Provides the Atlas API token
|
|
-atlas-endpoint=1.2.3.4 The address of the endpoint for Atlas integration.
|
|
-bootstrap Sets server to bootstrap mode
|
|
-bind=0.0.0.0 Sets the bind address for cluster communication
|
|
-http-port=8500 Sets the HTTP API port to listen on
|
|
-bootstrap-expect=0 Sets server to expect bootstrap mode.
|
|
-client=127.0.0.1 Sets the address to bind for client access.
|
|
This includes RPC, DNS, HTTP and HTTPS (if configured)
|
|
-config-file=foo Path to a JSON file to read configuration from.
|
|
This can be specified multiple times.
|
|
-config-dir=foo Path to a directory to read configuration files
|
|
from. This will read every file ending in ".json"
|
|
as configuration in this directory in alphabetical
|
|
order. This can be specified multiple times.
|
|
-data-dir=path Path to a data directory to store agent state
|
|
-recursor=1.2.3.4 Address of an upstream DNS server.
|
|
Can be specified multiple times.
|
|
-dc=east-aws Datacenter of the agent
|
|
-encrypt=key Provides the gossip encryption key
|
|
-join=1.2.3.4 Address of an agent to join at start time.
|
|
Can be specified multiple times.
|
|
-join-wan=1.2.3.4 Address of an agent to join -wan at start time.
|
|
Can be specified multiple times.
|
|
-retry-join=1.2.3.4 Address of an agent to join at start time with
|
|
retries enabled. Can be specified multiple times.
|
|
-retry-interval=30s Time to wait between join attempts.
|
|
-retry-max=0 Maximum number of join attempts. Defaults to 0, which
|
|
will retry indefinitely.
|
|
-retry-join-wan=1.2.3.4 Address of an agent to join -wan at start time with
|
|
retries enabled. Can be specified multiple times.
|
|
-retry-interval-wan=30s Time to wait between join -wan attempts.
|
|
-retry-max-wan=0 Maximum number of join -wan attempts. Defaults to 0, which
|
|
will retry indefinitely.
|
|
-log-level=info Log level of the agent.
|
|
-node=hostname Name of this node. Must be unique in the cluster
|
|
-protocol=N Sets the protocol version. Defaults to latest.
|
|
-rejoin Ignores a previous leave and attempts to rejoin the cluster.
|
|
-server Switches agent to server mode.
|
|
-syslog Enables logging to syslog
|
|
-ui Enables the built-in static web UI server
|
|
-ui-dir=path Path to directory containing the Web UI resources
|
|
-pid-file=path Path to file to store agent PID
|
|
|
|
`
|
|
return strings.TrimSpace(helpText)
|
|
}
|