Add configuration option for containerd cri

Disable cri plugin by default in containerd and
allows an option to enable the plugin. This only
has an effect on containerd when supervised by
dockerd. When containerd is managed outside of
dockerd, the configuration is not effected.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>
Upstream-commit: 8fb5f4d5c9b4933be31bf5371d65a95edb037261
Component: engine

components/engine/cmd/dockerd/config.go

@@ -29,6 +29,7 @@ func installCommonConfigFlags(conf *config.Config, flags *pflag.FlagSet) {
 	flags.StringVarP(&conf.Root, "graph", "g", defaultDataRoot, "Root of the Docker runtime")
 	flags.StringVar(&conf.ExecRoot, "exec-root", defaultExecRoot, "Root directory for execution state files")
 	flags.StringVar(&conf.ContainerdAddr, "containerd", "", "containerd grpc address")
+	flags.BoolVar(&conf.CriContainerd, "cri-containerd", false, "start containerd with cri")
 
 	// "--graph" is "soft-deprecated" in favor of "data-root". This flag was added
 	// before Docker 1.0, so won't be removed, only hidden, to discourage its usage.

components/engine/cmd/dockerd/daemon_unix.go

@@ -56,6 +56,9 @@ func (cli *DaemonCli) getPlatformRemoteOptions() ([]libcontainerd.RemoteOption,
 	} else {
 		opts = append(opts, libcontainerd.WithStartDaemon(true))
 	}
+	if !cli.Config.CriContainerd {
+		opts = append(opts, libcontainerd.WithPlugin("cri", nil))
+	}
 
 	return opts, nil
 }