k8s之容器迁移 [jenkins为例]

迁移步骤

• 容器内数据目录备份
• 修改yaml配置文件
• 重新创建容器
• 将备份文件拷贝到容器中

---

一、数据备份
1.找到需要迁移的容器名称

待迁移的容器

2.找到迁移容器的数据目录

[root@k8s-master01 jenkins]# cat jenkins-deployment.yaml 
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: jenkins
...
 volumeMounts:
        - name: jenkins-home
          mountPath: /var/jenkins_home
...

3. 备份容器中数据目录到本机

[root@k8s-master01 jenkins]# kubectl -n kube-public cp jenkins-4163869451-kkxpc:/var/jenkins_home jenkins-dir/

二、修改yaml配置文件

1. pvc 修改点：namespace、storageClassName

[root@k8s-master01 jenkins]# cat jenkins-pvc.yaml 
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: jenkins-pvc
  namespace: pp100
spec:
  storageClassName: heketi-usage
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 50Gi

2. deployment.yaml修改点：namespace

[root@k8s-master01 jenkins]# cat jenkins-deployment.yaml 
kind: Deployment
metadata:
  name: jenkins
  namespace: pp100
  labels:
    app-name: jenkins
spec:
  replicas: 1
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  template:
    metadata:
      labels:
        app-name: jenkins
    spec:
      containers:
      - name: jenkins
        image: docker.io/jenkins:latest
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 8080
          name: web
          protocol: TCP
        - containerPort: 50000
          name: agent
          protocol: TCP
        volumeMounts:
        - name: jenkins-home
          mountPath: /var/jenkins_home
        env:
        - name: JAVA_OPTS
          value: "-Duser.timezone=Asia/Shanghai -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap -XX:MaxRAMFraction=1 -Dhudson.slaves.NodeProvisioner.MARGIN=50 -Dhudson.slaves.NodeProvisioner.MARGIN0=0.85"
      volumes:
      - name: jenkins-home
        persistentVolumeClaim:
          claimName: jenkins-pvc
      dnsPolicy: ClusterFirst

3.svc.yaml 主要修改点：namespace

[root@k8s-master01 jenkins]# cat jenkins-service.yaml 
kind: Service
apiVersion: v1
metadata:
  labels:
    app-name: jenkins
  name: jenkins
  namespace: pp100
spec:
  ports:
  - port: 8080
    targetPort: 8080
    name: web
  - port: 50000
    targetPort: 50000
    name: agent
  selector:
    app-name: jenkins

4.ingress 的修改点：namespace、host

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: jenkins
  namespace: pp100
spec:
  rules:
  - host: k8s-jenkins100.pp100.net
    http:
      paths:
      - path: /
        backend:
          serviceName: jenkins
          servicePort: 8080

三、创建一个新的容器
1.创建并查看状态

[root@k8s-master01 jenkins]# kubectl create -f jenkins-pvc.yaml    
[root@k8s-master01 jenkins]# kubectl create -f jenkins-deployment.yaml      
[root@k8s-master01 jenkins]# kubectl create -f jenkins-service.yaml         
[root@k8s-master01 jenkins]# kubectl create -f jenkins-ingress.yaml
[root@k8s-master01 jenkins]# kubectl get pod -n pp100  -o  wide 
[root@k8s-master01 jenkins]# kubectl get pvc  -n pp100  -o  wide 
[root@k8s-master01 jenkins]# kubectl get svc   -n pp100  -o  wide 
[root@k8s-master01 jenkins]# kubectl get ing   -n pp100  -o  wide 

四、登录到容器中清空数据文件

[root@k8s-master01 jenkins]# kubectl -n pp100  exec -it  jenkins-4163869451-kkxpc  bash

五、拷贝备份的数据文件到容器中

[root@k8s-master01 jenkins]# kubectl -n pp100   cp ./jenkins-dir/   jenkins-4163869451-3r1nx:/var/jenkins_home/

六、重启容器

[root@k8s-master01 jenkins]# kubectl -n pp100 delete  pod jenkins-4163869451-kkxpc 

七、根据实际情况修改容器中目录权限等问题