/
main.go
198 lines (173 loc) · 5.25 KB
/
main.go
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package main
import (
_ "expvar"
"fmt"
"net"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"github.com/Sirupsen/logrus"
engineapi "github.com/docker/engine-api/client"
"github.com/docker/swarmkit/agent"
"github.com/docker/swarmkit/agent/exec/container"
"github.com/docker/swarmkit/cli"
"github.com/docker/swarmkit/log"
"github.com/docker/swarmkit/version"
"github.com/spf13/cobra"
"golang.org/x/net/context"
)
var externalCAOpt cli.ExternalCAOpt
func main() {
if err := mainCmd.Execute(); err != nil {
log.L.Fatal(err)
}
}
var (
mainCmd = &cobra.Command{
Use: os.Args[0],
Short: "Run a swarm control process",
SilenceUsage: true,
PersistentPreRun: func(cmd *cobra.Command, _ []string) {
logrus.SetOutput(os.Stderr)
flag, err := cmd.Flags().GetString("log-level")
if err != nil {
log.L.Fatal(err)
}
level, err := logrus.ParseLevel(flag)
if err != nil {
log.L.Fatal(err)
}
logrus.SetLevel(level)
v, err := cmd.Flags().GetBool("version")
if err != nil {
log.L.Fatal(err)
}
if v {
version.PrintVersion()
os.Exit(0)
}
},
RunE: func(cmd *cobra.Command, args []string) error {
ctx := context.Background()
hostname, err := cmd.Flags().GetString("hostname")
if err != nil {
return err
}
addr, err := cmd.Flags().GetString("listen-remote-api")
if err != nil {
return err
}
addrHost, _, err := net.SplitHostPort(addr)
if err == nil {
ip := net.ParseIP(addrHost)
if ip != nil && (ip.IsUnspecified() || ip.IsLoopback()) {
fmt.Println("Warning: Specifying a valid address with --listen-remote-api may be necessary for other managers to reach this one.")
}
}
unix, err := cmd.Flags().GetString("listen-control-api")
if err != nil {
return err
}
debugAddr, err := cmd.Flags().GetString("listen-debug")
if err != nil {
return err
}
managerAddr, err := cmd.Flags().GetString("join-addr")
if err != nil {
return err
}
forceNewCluster, err := cmd.Flags().GetBool("force-new-cluster")
if err != nil {
return err
}
hb, err := cmd.Flags().GetUint32("heartbeat-tick")
if err != nil {
return err
}
election, err := cmd.Flags().GetUint32("election-tick")
if err != nil {
return err
}
stateDir, err := cmd.Flags().GetString("state-dir")
if err != nil {
return err
}
joinToken, err := cmd.Flags().GetString("join-token")
if err != nil {
return err
}
engineAddr, err := cmd.Flags().GetString("engine-addr")
if err != nil {
return err
}
// Create a context for our GRPC call
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
client, err := engineapi.NewClient(engineAddr, "", nil, nil)
if err != nil {
return err
}
executor := container.NewExecutor(client)
if debugAddr != "" {
go func() {
// setup listening to give access to pprof, expvar, etc.
if err := http.ListenAndServe(debugAddr, nil); err != nil {
panic(err)
}
}()
}
n, err := agent.NewNode(&agent.NodeConfig{
Hostname: hostname,
ForceNewCluster: forceNewCluster,
ListenControlAPI: unix,
ListenRemoteAPI: addr,
JoinAddr: managerAddr,
StateDir: stateDir,
JoinToken: joinToken,
ExternalCAs: externalCAOpt.Value(),
Executor: executor,
HeartbeatTick: hb,
ElectionTick: election,
})
if err != nil {
return err
}
if err := n.Start(ctx); err != nil {
return err
}
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
<-c
n.Stop(ctx)
}()
go func() {
select {
case <-n.Ready():
case <-ctx.Done():
}
if ctx.Err() == nil {
logrus.Info("node is ready")
}
}()
return n.Err(context.Background())
},
}
)
func init() {
mainCmd.Flags().BoolP("version", "v", false, "Display the version and exit")
mainCmd.Flags().StringP("log-level", "l", "info", "Log level (options \"debug\", \"info\", \"warn\", \"error\", \"fatal\", \"panic\")")
mainCmd.Flags().StringP("state-dir", "d", "./swarmkitstate", "State directory")
mainCmd.Flags().StringP("join-token", "", "", "Specifies the secret token required to join the cluster")
mainCmd.Flags().String("engine-addr", "unix:///var/run/docker.sock", "Address of engine instance of agent.")
mainCmd.Flags().String("hostname", "", "Override reported agent hostname")
mainCmd.Flags().String("listen-remote-api", "0.0.0.0:4242", "Listen address for remote API")
mainCmd.Flags().String("listen-control-api", "./swarmkitstate/swarmd.sock", "Listen socket for control API")
mainCmd.Flags().String("listen-debug", "", "Bind the Go debug server on the provided address")
mainCmd.Flags().String("join-addr", "", "Join cluster with a node at this address")
mainCmd.Flags().Bool("force-new-cluster", false, "Force the creation of a new cluster from data directory")
mainCmd.Flags().Uint32("heartbeat-tick", 1, "Defines the heartbeat interval (in seconds) for raft member health-check")
mainCmd.Flags().Uint32("election-tick", 3, "Defines the amount of ticks (in seconds) needed without a Leader to trigger a new election")
mainCmd.Flags().Var(&externalCAOpt, "external-ca", "Specifications of one or more certificate signing endpoints")
}