package client import ( "encoding/json" "fmt" "strings" Cli "github.com/docker/docker/cli" flag "github.com/docker/docker/pkg/mflag" "github.com/docker/docker/pkg/nat" ) // CmdPort lists port mappings for a container. // If a private port is specified, it also shows the public-facing port that is NATed to the private port. // // Usage: docker port CONTAINER [PRIVATE_PORT[/PROTO]] func (cli *DockerCli) CmdPort(args ...string) error { cmd := Cli.Subcmd("port", []string{"CONTAINER [PRIVATE_PORT[/PROTO]]"}, Cli.DockerCommands["port"].Description, true) cmd.Require(flag.Min, 1) cmd.ParseFlags(args, true) serverResp, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/json", nil, nil) if err != nil { return err } defer serverResp.body.Close() var c struct { NetworkSettings struct { Ports nat.PortMap } } if err := json.NewDecoder(serverResp.body).Decode(&c); err != nil { return err } if cmd.NArg() == 2 { var ( port = cmd.Arg(1) proto = "tcp" parts = strings.SplitN(port, "/", 2) ) if len(parts) == 2 && len(parts[1]) != 0 { port = parts[0] proto = parts[1] } natPort := port + "/" + proto newP, err := nat.NewPort(proto, port) if err != nil { return err } if frontends, exists := c.NetworkSettings.Ports[newP]; exists && frontends != nil { for _, frontend := range frontends { fmt.Fprintf(cli.out, "%s:%s\n", frontend.HostIP, frontend.HostPort) } return nil } return fmt.Errorf("Error: No public port '%s' published for %s", natPort, cmd.Arg(0)) } for from, frontends := range c.NetworkSettings.Ports { for _, frontend := range frontends { fmt.Fprintf(cli.out, "%s -> %s:%s\n", from, frontend.HostIP, frontend.HostPort) } } return nil }