Add option init container

Author: alantang888

docs/user/clusters.md

@@ -50,6 +50,30 @@ spec:
     name: mysql-root-user-secret
 ```
 
+### Create a cluster with initContainers
+
+The following example will create a MySQL Cluster with a containers.
+Format same as Kubernetes container.
+```yaml
+apiVersion: mysql.oracle.com/v1alpha1
+kind: Cluster
+metadata:
+  name: mysql-cluster-with-init-container
+spec:
+  members: 1
+  initContainers:
+  - name: sleep
+    image: busybox
+    command:
+    - echo
+    - "This is first init container"
+  - name: sleep
+    image: busybox
+    command:
+    - echo
+    - "This is second init container"
+```
+
 ### Create a cluster with a persistent volume
 
 The following example will create a MySQL Cluster with a persistent local volume.

examples/cluster/cluster-with-init-container.yaml

@@ -0,0 +1,17 @@
+apiVersion: mysql.oracle.com/v1alpha1
+kind: Cluster
+metadata:
+  name: mysql
+spec:
+  members: 1
+  initContainers:
+  - name: sleep
+    image: busybox
+    command:
+    - echo
+    - "This is first init container"
+  - name: sleep
+    image: busybox
+    command:
+    - echo
+    - "This is second init container"

pkg/apis/mysql/v1alpha1/types.go

@@ -76,6 +76,8 @@ type ClusterSpec struct {
 	Tolerations *[]corev1.Toleration `json:"tolerations,omitempty"`
 	// Resources holds ResourceRequirements for the MySQL Agent & Server Containers
 	Resources *Resources `json:"resources,omitempty"`
+	// Init containers
+	InitContainers []corev1.Container `json:"initContainers,omitempty"`
 }
 
 // ClusterConditionType represents a valid condition of a Cluster.

pkg/resources/statefulsets/statefulset.go

@@ -388,6 +388,7 @@ func NewForCluster(cluster *v1alpha1.Cluster, images operatoropts.Images, servic
 					ServiceAccountName: "mysql-agent",
 					NodeSelector:       cluster.Spec.NodeSelector,
 					Affinity:           cluster.Spec.Affinity,
+					InitContainers:     cluster.Spec.InitContainers,
 					Containers:         containers,
 					Volumes:            podVolumes,
 				},