Support disable plugins.

Signed-off-by: Lantao Liu <lantaol@google.com>

server/config.go

@@ -18,6 +18,9 @@ type Config struct {
 	Debug Debug `toml:"debug"`
 	// Metrics and monitoring settings
 	Metrics MetricsConfig `toml:"metrics"`
+	// DisabledPlugins are IDs of plugins to disable. Disabled plugins won't be
+	// initialized and started.
+	DisabledPlugins []string `toml:"disabled_plugins"`
 	// Plugins provides plugin specific configuration for the initialization of a plugin
 	Plugins map[string]toml.Primitive `toml:"plugins"`
 	// OOMScore adjust the containerd's oom score

server/server.go

@@ -242,7 +242,7 @@ func LoadPlugins(config *Config) ([]*plugin.Registration, error) {
 	})
 
 	// return the ordered graph for plugins
-	return plugin.Graph(), nil
+	return plugin.Graph(config.DisabledPlugins), nil
 }
 
 func trapClosedConnErr(err error) error {