Add configuration for specifying cgroup manager

Signed-off-by: Mrunal Patel <mpatel@redhat.com>

cmd/server/config.go

@@ -16,6 +16,7 @@ const (
 	pausePath           = "/usr/libexec/ocid/pause"
 	seccompProfilePath  = "/etc/ocid/seccomp.json"
 	apparmorProfileName = "ocid-default"
+	cgroupManager       = "cgroupfs"
 )
 
 var commentedConfigTemplate = template.Must(template.New("config").Parse(`
@@ -69,6 +70,10 @@ seccomp_profile = "{{ .SeccompProfile }}"
 # default for the runtime.
 apparmor_profile = "{{ .ApparmorProfile }}"
 
+# cgroup_manager is the cgroup management implementation to be used
+# for the runtime.
+cgroup_manager = "{{ .CgroupManager }}"
+
 # The "ocid.image" table contains settings pertaining to the
 # management of OCI images.
 [ocid.image]
@@ -102,6 +107,7 @@ func DefaultConfig() *server.Config {
 			SELinux:         selinux.SelinuxEnabled(),
 			SeccompProfile:  seccompProfilePath,
 			ApparmorProfile: apparmorProfileName,
+			CgroupManager:   cgroupManager,
 		},
 		ImageConfig: server.ImageConfig{
 			Pause:    pausePath,

cmd/server/main.go

@@ -63,6 +63,9 @@ func mergeConfig(config *server.Config, ctx *cli.Context) error {
 	if ctx.GlobalIsSet("apparmor-profile") {
 		config.ApparmorProfile = ctx.GlobalString("apparmor-profile")
 	}
+	if ctx.GlobalIsSet("cgroup-manager") {
+		config.CgroupManager = ctx.GlobalString("cgroup-manager")
+	}
 	return nil
 }
 
@@ -150,6 +153,10 @@ func main() {
 			Name:  "selinux",
 			Usage: "enable selinux support",
 		},
+		cli.StringFlag{
+			Name:  "cgroup-manager",
+			Usage: "cgroup manager (cgroupfs or systemd)",
+		},
 	}
 
 	// remove once https://github.com/urfave/cli/pull/544 lands

server/config.go

@@ -72,6 +72,10 @@ type RuntimeConfig struct {
 	// ApparmorProfile is the apparmor profile name which is used as the
 	// default for the runtime.
 	ApparmorProfile string `toml:"apparmor_profile"`
+
+	// CgroupManager is the manager implementation name which is used to
+	// handle cgroups for containers.
+	CgroupManager string `toml:"cgroup_manager"`
 }
 
 // ImageConfig represents the "ocid.image" TOML config table.