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将 glusterfs 存储同时挂载到 initContainer 和 container 的指定目录上，如：/var/data/
在 initContainer 中拉取资源放到 /var/data/，也就推到了分布式存储 glusterfs 上，如：
wget -P /var/data/ http://127.0.0.1:8081/repository/k8s/kubectl/kubectl-v1.10.0-linux-amd64.tar.gz
这样当业务容器启动后，就可以在指定目录 /var/data 下看到 initContainer 拉取到的资源
在 initContainer 中，最好增加一部检测指定资源是否存在，以防重复拉取，如：
if [! -f “/var/data/kubectl-v1.10.0-linux-amd64.tar.gz”]; then wget -P /var/data/ http://127.0.0.1:8081/repository/k8s/kubectl/kubectl-v1.10.0-linux-amd64.tar.gz; fi
apiVersion: apps/v1
kind: Deployment
metadata:
name: mysql
spec:
replicas: 1
selector:
matchLabels:
name: mysql
template:
metadata:
labels:
name: mysql
spec:
initContainers:
– name: getresource
image: busybox:v0.1.0
command: [‘sh’, ‘-c’, ‘wget -P /var/data/ http://127.0.0.1:8081/repository/k8s/kubectl/kubectl-v1.10.0-linux-amd64.tar.gz ‘]
volumeMounts:
– name: mysql-pvc
mountPath: /var/data
containers:
– name: mysql
image: percona:5.7.22
imagePullPolicy: Always
ports:
– containerPort: 3306
resources:
limits:
memory: “500Mi”
cpu: “500m”
requests:
memory: “500Mi”
cpu: “250m”
env:
– name: MYSQL_ROOT_PASSWORD
value: “mysql”
volumeMounts:
– name: mysql-pvc
mountPath: /var/data
volumes:
– name: mysql-pvc
persistentVolumeClaim:
claimName: mysql
—
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql
spec:
accessModes:
– ReadWriteMany
resources:
requests:
storage: “5Gi”
volumeName:
storageClassName: glusterfs
—
kind: Service
apiVersion: v1
metadata:
name: mysql
spec:
type: ClusterIP
ports:
– name: mysql
port: 3306
targetPort: 3306
protocol: TCP
selector:
name: mysql
