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init.go
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init.go
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package swarm
import (
"errors"
"fmt"
"strings"
"golang.org/x/net/context"
"github.com/docker/docker/api/client"
"github.com/docker/docker/cli"
"github.com/docker/engine-api/types/swarm"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
const (
generatedSecretEntropyBytes = 16
generatedSecretBase = 36
// floor(log(2^128-1, 36)) + 1
maxGeneratedSecretLength = 25
)
type initOptions struct {
swarmOptions
listenAddr NodeAddrOption
// Not a NodeAddrOption because it has no default port.
advertiseAddr string
forceNewCluster bool
}
func newInitCommand(dockerCli *client.DockerCli) *cobra.Command {
opts := initOptions{
listenAddr: NewListenAddrOption(),
}
cmd := &cobra.Command{
Use: "init [OPTIONS]",
Short: "Initialize a swarm",
Args: cli.NoArgs,
RunE: func(cmd *cobra.Command, args []string) error {
return runInit(dockerCli, cmd.Flags(), opts)
},
}
flags := cmd.Flags()
flags.Var(&opts.listenAddr, flagListenAddr, "Listen address (format: <ip|interface>[:port])")
flags.StringVar(&opts.advertiseAddr, flagAdvertiseAddr, "", "Advertised address (format: <ip|interface>[:port])")
flags.BoolVar(&opts.forceNewCluster, "force-new-cluster", false, "Force create a new cluster from current state.")
addSwarmFlags(flags, &opts.swarmOptions)
return cmd
}
func runInit(dockerCli *client.DockerCli, flags *pflag.FlagSet, opts initOptions) error {
client := dockerCli.Client()
ctx := context.Background()
req := swarm.InitRequest{
ListenAddr: opts.listenAddr.String(),
AdvertiseAddr: opts.advertiseAddr,
ForceNewCluster: opts.forceNewCluster,
Spec: opts.swarmOptions.ToSpec(),
}
nodeID, err := client.SwarmInit(ctx, req)
if err != nil {
if strings.Contains(err.Error(), "could not choose an IP address to advertise") || strings.Contains(err.Error(), "could not find the system's IP address") {
return errors.New(err.Error() + " - specify one with --advertise-addr")
}
return err
}
fmt.Fprintf(dockerCli.Out(), "Swarm initialized: current node (%s) is now a manager.\n\n", nodeID)
if err := printJoinCommand(ctx, dockerCli, nodeID, true, false); err != nil {
return err
}
fmt.Fprint(dockerCli.Out(), "To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.\n\n")
return nil
}