439 lines
12 KiB
Go
439 lines
12 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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"log"
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"os"
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"os/signal"
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"path/filepath"
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"strings"
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"syscall"
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"time"
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"github.com/hashicorp/consul/agent"
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"github.com/hashicorp/consul/agent/config"
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"github.com/hashicorp/consul/command/flags"
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"github.com/hashicorp/consul/lib"
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"github.com/hashicorp/consul/logger"
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"github.com/hashicorp/consul/service_os"
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"github.com/hashicorp/go-checkpoint"
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multierror "github.com/hashicorp/go-multierror"
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"github.com/hashicorp/logutils"
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"github.com/mitchellh/cli"
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"google.golang.org/grpc/grpclog"
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)
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func New(ui cli.Ui, revision, version, versionPre, versionHuman string, shutdownCh <-chan struct{}) *cmd {
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ui = &cli.PrefixedUi{
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OutputPrefix: "==> ",
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InfoPrefix: " ",
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ErrorPrefix: "==> ",
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Ui: ui,
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}
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c := &cmd{
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UI: ui,
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revision: revision,
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version: version,
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versionPrerelease: versionPre,
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versionHuman: versionHuman,
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shutdownCh: shutdownCh,
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}
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c.init()
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return c
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}
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// AgentCommand 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 cmd struct {
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UI cli.Ui
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flags *flag.FlagSet
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http *flags.HTTPFlags
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help string
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revision string
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version string
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versionPrerelease string
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versionHuman string
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shutdownCh <-chan struct{}
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flagArgs config.Flags
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logFilter *logutils.LevelFilter
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logOutput io.Writer
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logger *log.Logger
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}
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func (c *cmd) init() {
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c.flags = flag.NewFlagSet("", flag.ContinueOnError)
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config.AddFlags(c.flags, &c.flagArgs)
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c.help = flags.Usage(help, c.flags)
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}
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func (c *cmd) Run(args []string) int {
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code := c.run(args)
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if c.logger != nil {
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c.logger.Println("[INFO] agent: Exit code:", code)
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}
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return code
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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 *cmd) readConfig() *config.RuntimeConfig {
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b, err := config.NewBuilder(c.flagArgs)
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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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cfg, err := b.BuildAndValidate()
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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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for _, w := range b.Warnings {
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c.UI.Warn(w)
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}
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return &cfg
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}
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// checkpointResults is used to handler periodic results from our update checker
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func (c *cmd) checkpointResults(results *checkpoint.CheckResponse, err error) {
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if err != nil {
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c.UI.Error(fmt.Sprintf("Failed to check for updates: %v", err))
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return
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}
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if results.Outdated {
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c.UI.Error(fmt.Sprintf("Newer Consul version available: %s (currently running: %s)", results.CurrentVersion, c.version))
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}
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for _, alert := range results.Alerts {
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switch alert.Level {
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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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func (c *cmd) startupUpdateCheck(config *config.RuntimeConfig) {
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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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// 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
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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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// startupJoin is invoked to handle any joins specified to take place at start time
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func (c *cmd) startupJoin(agent *agent.Agent, cfg *config.RuntimeConfig) error {
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if len(cfg.StartJoinAddrsLAN) == 0 {
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return nil
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}
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c.UI.Output("Joining cluster...")
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n, err := agent.JoinLAN(cfg.StartJoinAddrsLAN)
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if err != nil {
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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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}
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// startupJoinWan is invoked to handle any joins -wan specified to take place at start time
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func (c *cmd) startupJoinWan(agent *agent.Agent, cfg *config.RuntimeConfig) error {
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if len(cfg.StartJoinAddrsWAN) == 0 {
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return nil
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}
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c.UI.Output("Joining -wan cluster...")
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n, err := agent.JoinWAN(cfg.StartJoinAddrsWAN)
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if err != nil {
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return err
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}
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c.UI.Info(fmt.Sprintf("Join -wan completed. Synced with %d initial agents", n))
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return nil
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}
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func (c *cmd) run(args []string) int {
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// Parse our configs
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if err := c.flags.Parse(args); err != nil {
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if !strings.Contains(err.Error(), "help requested") {
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c.UI.Error(fmt.Sprintf("error parsing flags: %v", err))
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}
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return 1
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}
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c.flagArgs.Args = c.flags.Args()
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config := c.readConfig()
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if config == nil {
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return 1
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}
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// Setup the log outputs
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logConfig := &logger.Config{
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LogLevel: config.LogLevel,
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EnableSyslog: config.EnableSyslog,
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SyslogFacility: config.SyslogFacility,
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LogFilePath: config.LogFile,
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LogRotateDuration: config.LogRotateDuration,
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LogRotateBytes: config.LogRotateBytes,
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LogRotateMaxFiles: config.LogRotateMaxFiles,
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}
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logFilter, logGate, logWriter, logOutput, ok := logger.Setup(logConfig, c.UI)
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if !ok {
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return 1
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}
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c.logFilter = logFilter
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c.logOutput = logOutput
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c.logger = log.New(logOutput, "", log.LstdFlags)
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// Setup gRPC logger to use the same output/filtering
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grpclog.SetLoggerV2(logger.NewGRPCLogger(logConfig, c.logger))
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memSink, err := lib.InitTelemetry(config.Telemetry)
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if err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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// Create the agent
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c.UI.Output("Starting Consul agent...")
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agent, err := agent.New(config, c.logger)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error creating agent: %s", err))
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return 1
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}
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agent.LogOutput = logOutput
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agent.LogWriter = logWriter
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agent.MemSink = memSink
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segment := config.SegmentName
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if config.ServerMode {
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segment = "<all>"
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}
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c.UI.Info(fmt.Sprintf(" Version: '%s'", c.versionHuman))
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c.UI.Info(fmt.Sprintf(" Node ID: '%s'", config.NodeID))
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c.UI.Info(fmt.Sprintf(" Node name: '%s'", config.NodeName))
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c.UI.Info(fmt.Sprintf(" Datacenter: '%s' (Segment: '%s')", config.Datacenter, segment))
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c.UI.Info(fmt.Sprintf(" Server: %v (Bootstrap: %v)", config.ServerMode, config.Bootstrap))
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c.UI.Info(fmt.Sprintf(" Client Addr: %v (HTTP: %d, HTTPS: %d, gRPC: %d, DNS: %d)", config.ClientAddrs,
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config.HTTPPort, config.HTTPSPort, config.GRPCPort, config.DNSPort))
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c.UI.Info(fmt.Sprintf(" Cluster Addr: %v (LAN: %d, WAN: %d)", config.AdvertiseAddrLAN,
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config.SerfPortLAN, config.SerfPortWAN))
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c.UI.Info(fmt.Sprintf(" Encrypt: Gossip: %v, TLS-Outgoing: %v, TLS-Incoming: %v, Auto-Encrypt-TLS: %t",
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config.EncryptKey != "", config.VerifyOutgoing, config.VerifyIncoming, config.AutoEncryptTLS || config.AutoEncryptAllowTLS))
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// Enable log streaming
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c.UI.Info("")
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c.UI.Output("Log data will now stream in as it occurs:\n")
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logGate.Flush()
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// wait for signal
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signalCh := make(chan os.Signal, 10)
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stopCh := make(chan struct{})
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signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGPIPE)
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go func() {
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for {
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var sig os.Signal
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select {
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case s := <-signalCh:
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sig = s
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case <-stopCh:
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return
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}
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switch sig {
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case syscall.SIGPIPE:
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continue
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case syscall.SIGHUP:
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err := fmt.Errorf("cannot reload before agent started")
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c.logger.Printf("[ERR] agent: Caught signal: %s err: %s\n", sig, err)
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default:
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c.logger.Println("[INFO] agent: Caught signal: ", sig)
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agent.InterruptStartCh <- struct{}{}
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return
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}
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}
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}()
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err = agent.Start()
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signal.Stop(signalCh)
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select {
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case stopCh <- struct{}{}:
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default:
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}
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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 1
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}
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// shutdown agent before endpoints
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defer agent.ShutdownEndpoints()
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defer agent.ShutdownAgent()
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if !config.DisableUpdateCheck && !config.DevMode {
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c.startupUpdateCheck(config)
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}
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if err := c.startupJoin(agent, config); err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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if err := c.startupJoinWan(agent, config); err != nil {
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c.UI.Error(err.Error())
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return 1
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}
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// Let the agent know we've finished registration
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agent.StartSync()
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c.UI.Output("Consul agent running!")
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// wait for signal
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signalCh = make(chan os.Signal, 10)
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signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGPIPE)
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for {
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var sig os.Signal
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var reloadErrCh chan error
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select {
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case s := <-signalCh:
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sig = s
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case ch := <-agent.ReloadCh():
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sig = syscall.SIGHUP
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reloadErrCh = ch
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case <-service_os.Shutdown_Channel():
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sig = os.Interrupt
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case <-c.shutdownCh:
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sig = os.Interrupt
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case err := <-agent.RetryJoinCh():
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c.logger.Println("[ERR] agent: Retry join failed: ", err)
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return 1
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case <-agent.ShutdownCh():
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// agent is already down!
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return 0
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}
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switch sig {
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case syscall.SIGPIPE:
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continue
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case syscall.SIGHUP:
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c.logger.Println("[INFO] agent: Caught signal: ", sig)
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conf, err := c.handleReload(agent, config)
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if conf != nil {
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config = conf
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}
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if err != nil {
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c.logger.Println("[ERR] agent: Reload config failed: ", err)
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}
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// Send result back if reload was called via HTTP
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if reloadErrCh != nil {
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reloadErrCh <- err
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}
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default:
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c.logger.Println("[INFO] agent: Caught signal: ", sig)
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graceful := (sig == os.Interrupt && !(config.SkipLeaveOnInt)) || (sig == syscall.SIGTERM && (config.LeaveOnTerm))
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if !graceful {
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c.logger.Println("[INFO] agent: Graceful shutdown disabled. Exiting")
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return 1
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}
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c.logger.Println("[INFO] agent: Gracefully shutting down agent...")
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gracefulCh := make(chan struct{})
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go func() {
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if err := agent.Leave(); err != nil {
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c.logger.Println("[ERR] agent: Error on leave:", err)
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return
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}
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close(gracefulCh)
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}()
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gracefulTimeout := 15 * time.Second
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select {
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case <-signalCh:
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c.logger.Printf("[INFO] agent: Caught second signal %v. Exiting\n", sig)
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return 1
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case <-time.After(gracefulTimeout):
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c.logger.Println("[INFO] agent: Timeout on graceful leave. Exiting")
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return 1
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case <-gracefulCh:
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c.logger.Println("[INFO] agent: Graceful exit completed")
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return 0
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}
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}
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}
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}
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// handleReload is invoked when we should reload our configs, e.g. SIGHUP
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func (c *cmd) handleReload(agent *agent.Agent, cfg *config.RuntimeConfig) (*config.RuntimeConfig, error) {
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c.logger.Println("[INFO] agent: Reloading configuration...")
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var errs error
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newCfg := c.readConfig()
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if newCfg == nil {
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errs = multierror.Append(errs, fmt.Errorf("Failed to reload configs"))
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return cfg, errs
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}
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// Change the log level
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minLevel := logutils.LogLevel(strings.ToUpper(newCfg.LogLevel))
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if logger.ValidateLevelFilter(minLevel, c.logFilter) {
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c.logFilter.SetMinLevel(minLevel)
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} else {
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errs = multierror.Append(fmt.Errorf(
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"Invalid log level: %s. Valid log levels are: %v",
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minLevel, c.logFilter.Levels))
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// Keep the current log level
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newCfg.LogLevel = cfg.LogLevel
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}
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if err := agent.ReloadConfig(newCfg); err != nil {
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errs = multierror.Append(fmt.Errorf(
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"Failed to reload configs: %v", err))
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}
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return newCfg, errs
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}
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func (c *cmd) Synopsis() string {
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return synopsis
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}
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func (c *cmd) Help() string {
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return c.help
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}
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const synopsis = "Runs a Consul agent"
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const help = `
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Usage: consul agent [options]
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Starts the Consul agent and runs until an interrupt is received. The
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agent represents a single node in a cluster.
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`
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