Adding the hostname option to docker service command

Signed-off-by: Nikolay Milovanov <nmil@itransformers.net>

command/service/create.go

@@ -33,6 +33,7 @@ func newCreateCommand(dockerCli *command.DockerCli) *cobra.Command {
 
 	flags.VarP(&opts.labels, flagLabel, "l", "Service labels")
 	flags.Var(&opts.containerLabels, flagContainerLabel, "Container labels")
+	flags.StringVar(&opts.hostname, flagHostname, "", "Container hostname")
 	flags.VarP(&opts.env, flagEnv, "e", "Set environment variables")
 	flags.Var(&opts.envFile, flagEnvFile, "Read in a file of environment variables")
 	flags.Var(&opts.mounts, flagMount, "Attach a mount to the service")

command/service/opts.go

@@ -455,6 +455,7 @@ type serviceOptions struct {
 	containerLabels opts.ListOpts
 	image           string
 	args            []string
+	hostname        string
 	env             opts.ListOpts
 	envFile         opts.ListOpts
 	workdir         string
@@ -526,6 +527,7 @@ func (opts *serviceOptions) ToService() (swarm.ServiceSpec, error) {
 				Image:           opts.image,
 				Args:            opts.args,
 				Env:             currentEnv,
+				Hostname:        opts.hostname,
 				Labels:          runconfigopts.ConvertKVStringsToMap(opts.containerLabels.GetAll()),
 				Dir:             opts.workdir,
 				User:            opts.user,
@@ -625,6 +627,7 @@ const (
 	flagContainerLabelRemove  = "container-label-rm"
 	flagContainerLabelAdd     = "container-label-add"
 	flagEndpointMode          = "endpoint-mode"
+	flagHostname              = "hostname"
 	flagEnv                   = "env"
 	flagEnvFile               = "env-file"
 	flagEnvRemove             = "env-rm"