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join.go
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join.go
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package swarm
import (
"context"
"fmt"
"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 joinOptions struct {
remote string
listenAddr NodeAddrOption
// Not a NodeAddrOption because it has no default port.
advertiseAddr string
dataPathAddr string
token string
availability string
}
func newJoinCommand(dockerCli command.Cli) *cobra.Command {
opts := joinOptions{
listenAddr: NewListenAddrOption(),
}
cmd := &cobra.Command{
Use: "join [OPTIONS] HOST:PORT",
Short: "Join a swarm as a node and/or manager",
Args: cli.ExactArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
opts.remote = args[0]
return runJoin(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.StringVar(&opts.dataPathAddr, flagDataPathAddr, "", "Address or interface to use for data path traffic (format: <ip|interface>)")
flags.SetAnnotation(flagDataPathAddr, "version", []string{"1.31"})
flags.StringVar(&opts.token, flagToken, "", "Token for entry into the swarm")
flags.StringVar(&opts.availability, flagAvailability, "active", `Availability of the node ("active"|"pause"|"drain")`)
return cmd
}
func runJoin(dockerCli command.Cli, flags *pflag.FlagSet, opts joinOptions) error {
client := dockerCli.Client()
ctx := context.Background()
req := swarm.JoinRequest{
JoinToken: opts.token,
ListenAddr: opts.listenAddr.String(),
AdvertiseAddr: opts.advertiseAddr,
DataPathAddr: opts.dataPathAddr,
RemoteAddrs: []string{opts.remote},
}
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)
}
}
err := client.SwarmJoin(ctx, req)
if err != nil {
return err
}
info, err := client.Info(ctx)
if err != nil {
return err
}
if info.Swarm.ControlAvailable {
fmt.Fprintln(dockerCli.Out(), "This node joined a swarm as a manager.")
} else {
fmt.Fprintln(dockerCli.Out(), "This node joined a swarm as a worker.")
}
return nil
}