package swarm import ( "context" "fmt" "net" "strings" "github.com/docker/cli/cli" "github.com/docker/cli/cli/command" "github.com/docker/docker/api/types/swarm" "github.com/pkg/errors" "github.com/spf13/cobra" "github.com/spf13/pflag" ) type initOptions struct { swarmOptions listenAddr NodeAddrOption // Not a NodeAddrOption because it has no default port. advertiseAddr string dataPathAddr string forceNewCluster bool availability string defaultAddrPools []net.IPNet DefaultAddrPoolMaskLength uint32 } func newInitCommand(dockerCli command.Cli) *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: [:port])") flags.StringVar(&opts.advertiseAddr, flagAdvertiseAddr, "", "Advertised address (format: [:port])") flags.StringVar(&opts.dataPathAddr, flagDataPathAddr, "", "Address or interface to use for data path traffic (format: )") flags.SetAnnotation(flagDataPathAddr, "version", []string{"1.31"}) flags.BoolVar(&opts.forceNewCluster, "force-new-cluster", false, "Force create a new cluster from current state") flags.BoolVar(&opts.autolock, flagAutolock, false, "Enable manager autolocking (requiring an unlock key to start a stopped manager)") flags.StringVar(&opts.availability, flagAvailability, "active", `Availability of the node ("active"|"pause"|"drain")`) flags.IPNetSliceVar(&opts.defaultAddrPools, flagDefaultAddrPool, []net.IPNet{}, "default address pool in CIDR format") flags.SetAnnotation(flagDefaultAddrPool, "version", []string{"1.39"}) flags.Uint32Var(&opts.DefaultAddrPoolMaskLength, flagDefaultAddrPoolMaskLength, 24, "default address pool subnet mask length") flags.SetAnnotation(flagDefaultAddrPoolMaskLength, "version", []string{"1.39"}) addSwarmFlags(flags, &opts.swarmOptions) return cmd } func runInit(dockerCli command.Cli, flags *pflag.FlagSet, opts initOptions) error { var defaultAddrPool []string client := dockerCli.Client() ctx := context.Background() for _, p := range opts.defaultAddrPools { defaultAddrPool = append(defaultAddrPool, p.String()) } req := swarm.InitRequest{ ListenAddr: opts.listenAddr.String(), AdvertiseAddr: opts.advertiseAddr, DataPathAddr: opts.dataPathAddr, DefaultAddrPool: defaultAddrPool, ForceNewCluster: opts.forceNewCluster, Spec: opts.swarmOptions.ToSpec(flags), AutoLockManagers: opts.swarmOptions.autolock, SubnetSize: opts.DefaultAddrPoolMaskLength, } if flags.Changed(flagAvailability) { availability := swarm.NodeAvailability(strings.ToLower(opts.availability)) switch availability { case swarm.NodeAvailabilityActive, swarm.NodeAvailabilityPause, swarm.NodeAvailabilityDrain: req.Availability = availability default: return errors.Errorf("invalid availability %q, only active, pause and drain are supported", opts.availability) } } 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") if req.AutoLockManagers { unlockKeyResp, err := client.SwarmGetUnlockKey(ctx) if err != nil { return errors.Wrap(err, "could not fetch unlock key") } printUnlockCommand(dockerCli.Out(), unlockKeyResp.UnlockKey) } return nil }