k8s initContainers demo pod依赖

apiVersion: v1
kind: Service
metadata:
name: mysql
spec:
clusterIP: None
ports:

• name: mysql
  port: 3306
  selector:
  app: mysql

apiVersion: v1
kind: Service
metadata:
name: wordpress
spec:
ports:

• name: wordpress
  port: 80
  targetPort: 80
  selector:
  app: wordpress
  type: NodePort

apiVersion: apps/v1
kind: StatefulSet
metadata:
name: mysql
spec:
selector:
matchLabels:
app: mysql
serviceName: mysql
replicas: 1
template:
metadata:
labels:
app: mysql
spec:
containers:
- name: mysql
image: mysql:5.7
env:
- name: MYSQL_ALLOW_EMPTY_PASSWORD
value: "true"
livenessProbe:
exec:
command: ["mysqladmin", "ping"]
initialDelaySeconds: 30
periodSeconds: 10
timeoutSeconds: 5
readinessProbe:
exec:
# Check we can execute queries over TCP (skip-networking is off).
command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"]
initialDelaySeconds: 5
periodSeconds: 2
timeoutSeconds: 1

apiVersion: apps/v1
kind: Deployment
metadata:
name: wordpress
spec:
replicas: 1
selector:
matchLabels:
app: wordpress
template:
metadata:
labels:
app: wordpress
spec:
containers:
- name: wordpress
image: wordpress:4
ports:
- containerPort: 80
env:
- name: WORDPRESS_DB_HOST
value: mysql
- name: WORDPRESS_DB_PASSWORD
value: ""
initContainers:
- name: init-mysql
image: busybox
command: ['sh', '-c', 'until nslookup mysql; do echo waiting for mysql; sleep 2; done;']