Deployment

1.Deployment概念

用于部署无状态的服务，这个最常用的控制器。一般用于管理维护企业内部无状态的微服务，比如configserver、zuul、springboot。他可以管理多个副本的Pod实现无缝迁移、自动扩容缩容、自动灾难恢复、一键回滚等功能。

2.创建一个Deployment

1.命令行创建
[root@k8s-master01 ~]# kubectl create deployment nginx --image=nginx:1.15.2
2.导出yaml文件
[root@k8s-master01 ~]# kubectl get deployment nginx -o yaml > nginx-deploy.yaml、
3.查看yaml文件
[root@k8s-master01 ~]# cat -n nginx-deploy.yaml     #### 这是删减修改后的
     1	apiVersion: apps/v1
     2	kind: Deployment
     3	metadata:
     4	  annotations:
     5	    deployment.kubernetes.io/revision: "1"
     6	  creationTimestamp: "2020-09-19T02:41:11Z"
     7	  generation: 1
     8	  labels:
     9	    app: nginx
    10	  name: nginx
    11	  namespace: default
    12	spec:
    13	  progressDeadlineSeconds: 600
    14	  replicas: 2 #副本数,默认是1
    15	  revisionHistoryLimit: 10 # 历史记录保留的个数
    16	  selector:
    17	    matchLabels:
    18	      app: nginx
    19	  strategy:
    20	    rollingUpdate:
    21	      maxSurge: 25%
    22	      maxUnavailable: 25%
    23	    type: RollingUpdate
    24	  template:
    25	    metadata:
    26	      creationTimestamp: null
    27	      labels:
    28	        app: nginx
    29	    spec:
    30	      containers:
    31	      - image: nginx:1.15.2
    32	        imagePullPolicy: IfNotPresent
    33	        name: nginx
    34	        resources: {}
    35	        terminationMessagePath: /dev/termination-log
    36	        terminationMessagePolicy: File
    37	      dnsPolicy: ClusterFirst
    38	      restartPolicy: Always
    39	      schedulerName: default-scheduler
    40	      securityContext: {}
    41	      terminationGracePeriodSeconds: 30

3.replace下

[root@k8s-master01 ~]# kubectl replace -f nginx-deploy.yaml  # 通过文件管理我们的deployment

4.查看

[root@k8s-master01 ~]# kubectl get deployment nginx
NAME    READY   UP-TO-DATE   AVAILABLE   AGE
nginx   2/2     2            2           11m
[root@k8s-master01 ~]#  kubectl get deploy -owide
NAME    READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES         SELECTOR
nginx   2/2     2            2           12m   nginx        nginx:1.15.2   app=nginx
	NAME： Deployment名称
	READY：Pod的状态，已经Ready的个数
	UP-TO-DATE：已经达到期望状态的被更新的副本数
	AVAILABLE：已经可以用的副本数
	AGE：显示应用程序运行的时间
	CONTAINERS：容器名称
	IMAGES：容器的镜像
	SELECTOR：管理的Pod的标签
[root@k8s-master01 ~]# kubectl get po -owide 查看部署在哪个节点

5.edit管理

[root@k8s-master01 ~]# kubectl edit deploy nginx  ### 副本数修改为1
deployment.apps/nginx edited
[root@k8s-master01 ~]# kubectl get po        # 会先有个pod会进入Terminating
NAME                     READY   STATUS        RESTARTS   AGE
nginx-66bbc9fdc5-jmgwq   1/1     Running       0          15m
nginx-66bbc9fdc5-l2lfn   0/1     Terminating   0          10m
[root@k8s-master01 ~]# kubectl get po
NAME                     READY   STATUS    RESTARTS   AGE
nginx-66bbc9fdc5-jmgwq   1/1     Running   0          16m