feat(singleNode): Support running single node. radondb#361

api/v1alpha1/mysqlcluster_types.go

@@ -31,7 +31,7 @@ type MysqlClusterSpec struct {
 
 	// Replicas is the number of pods.
 	// +optional
-	// +kubebuilder:validation:Enum=0;2;3;5
+	// +kubebuilder:validation:Enum=0;1;2;3;5
 	// +kubebuilder:default:=3
 	Replicas *int32 `json:"replicas,omitempty"`
 

charts/mysql-operator/crds/mysql.radondb.com_mysqlclusters.yaml

@@ -1259,6 +1259,7 @@ spec:
                 description: Replicas is the number of pods.
                 enum:
                 - 0
+                - 1
                 - 2
                 - 3
                 - 5

config/crd/bases/mysql.radondb.com_mysqlclusters.yaml

@@ -1259,6 +1259,7 @@ spec:
                 description: Replicas is the number of pods.
                 enum:
                 - 0
+                - 1
                 - 2
                 - 3
                 - 5

mysqlcluster/container/xenon.go

@@ -43,7 +43,11 @@ func (c *xenon) getImage() string {
 
 // getCommand get the container command.
 func (c *xenon) getCommand() []string {
-	return nil
+	if *c.Spec.Replicas == 1 {
+		return []string{"xenon", "-c", "/etc/xenon/xenon.json", "-r", "LEADER"}
+	}
+	// If return nil, statefulset never update command , And I don't know why.
+	return []string{"xenon", "-c", "/etc/xenon/xenon.json"}
 }
 
 // getEnvVars get the container env.