5 k8s之deployment及Rs

一，rc 的局限性

1 如kubectl edit rc myweb 只有启动新的pod才会生效，或者删除老的pod，重新启动新的pod的才会生效，否则还是继续使用老的pod,无法自动生效

2 rc滚动升级之后，pod的标签也升级了，导致svc关联不上

[root@k8s-master ~]# kubectl rolling-update myweb -f nginx-rc1.15.yaml --update-period=1s
[root@k8s-master ~]# kubectl get all -o wide

二  deployment出现，为了弥补Rc的局限性
1 测试前删除rc,即对应的pod都删除了

[root@k8s-master ~]# kubectl delete rc mywebv2
replicationcontroller "mywebv2" deleted

2 deployment的yml配置文件示例

[root@k8s-master ~]# vim nginx-deploy.yaml 

apiVersion: extensions/v1beta1                  #版本
kind: Deployment                                #资源类型
metadata:
  name: nginx-deployment                        #定义deployment的名字
spec:
  replicas: 3                                   #副本数设置
  template:                                     #模板
    metadata:
      labels:
        app: nginx                              #标签设置为nginx
    spec:
      containers:
      - name: nginx                             # 镜像名称
        image: 192.168.31.50:5000/nginx:1.13        #使用的镜像
        ports:
        - containerPort: 80                     # 镜像端口

3 创建deployment

[root@k8s-master ~]# vim nginx-deploy.yaml 
[root@k8s-master ~]# kubectl create -f nginx-deploy.yaml 
deployment "nginx-deployment" created
[root@k8s-master ~]# kubectl get all -o wide

 3-1 由于创建deployment使用的标签是nginx,修改svc关联的标签为nginx即可，否则无法访问资源

[root@k8s-master ~]# kubectl edit svc myweb

　

 3 -2 测试通过deployment来实现升级

[root@k8s-master ~]# kubectl edit deployment nginx-deployment

升级成功

 4 创建depllyment会自动创建rs, rs有rc的95%的功能，rs由deployment自动创建

 5 通过rs实现回滚相关操作

 5-1 查看版本

[root@k8s-master ~]# kubectl rollout history deployment nginx-deployment 
deployments "nginx-deployment"
REVISION	CHANGE-CAUSE
1		<none>
2		<none>

5-2 回滚到老的版本1版本

[root@k8s-master ~]# kubectl rollout undo deployment nginx-deployment --to-revision=1
deployment "nginx-deployment" rolled back

5-3 查看是否成功回滚到nginx1.13版本

 6 通过命令创建deployment

[root@k8s-master ~]# kubectl run deploy-nginx2 --image=192.168.31.50:5000/nginx:1.13 --replicas=3 --record 
deployment "deploy-nginx2" created
[root@k8s-master ~]# 

6-1 查看历史版本

[root@k8s-master ~]# kubectl rollout history deployment deploy-nginx2 
deployments "deploy-nginx2"
REVISION	CHANGE-CAUSE
1		kubectl run deploy-nginx2 --image=192.168.31.50:5000/nginx:1.13 --replicas=3 --record

6-2 通过命令更改镜像版本

[root@k8s-master ~]# kubectl set image deployment deploy-nginx2 deploy-nginx2=192.168.31.50:5000/nginx:1.15
deployment "deploy-nginx2" image updated

6-3 查看命令操作记录的版本

[root@k8s-master ~]# kubectl rollout history deployment deploy-nginx2 
deployments "deploy-nginx2"
REVISION	CHANGE-CAUSE
1		kubectl run deploy-nginx2 --image=192.168.31.50:5000/nginx:1.13 --replicas=3 --record
2		kubectl set image deployment deploy-nginx2 deploy-nginx2=192.168.31.50:5000/nginx:1.15

6-3 创建开放端口

[root@k8s-master ~]# kubectl expose deployment deploy-nginx2 --port=80 --type=NodePort
service "deploy-nginx2" exposed

 7 查看pod的日志

kubectl logs pod名

[root@k8s-master ~]# kubectl logs nginx-deployment-3776102587-1h8br 
172.16.96.0 - - [20/Sep/2019:05:40:42 +0000] "HEAD / HTTP/1.1" 200 0 "-" "curl/7.29.0" "-"