kubectl命令实践(4) --- 部署管理

命令	解释
kubectl scale	实现水平扩展或收缩
kubectl rollout status	部署状态变更，状态检查
kubectl rollout history	部署的历史
kubectl rollout undo	回滚部署到最近或者某个版本

实际操作：

1. 执行命令: kubectl scale deployment nginx  --replicas=3

deployment.extensions/nginx scaled

2.执行命令:kubectl get deployments

NAME    DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx   3         3         3            3           50m

3.kubectl describe rs nginx-65899c769f

Name:           nginx-65899c769f
Namespace:      default
Selector:       pod-template-hash=2145573259,run=nginx
Labels:         pod-template-hash=2145573259
                run=nginx
Annotations:    deployment.kubernetes.io/desired-replicas: 3
                deployment.kubernetes.io/max-replicas: 4
                deployment.kubernetes.io/revision: 1
Controlled By:  Deployment/nginx
Replicas:       3 current / 3 desired
Pods Status:    3 Running / 0 Waiting / 0 Succeeded / 0 Failed
Pod Template:
  Labels:  pod-template-hash=2145573259
           run=nginx
  Containers:
   nginx:
    Image:        nginx
    Port:         
    Host Port:    
    Environment:  
    Mounts:       
  Volumes:        
Events:
  Type    Reason            Age   From                   Message
  ----    ------            ----  ----                   -------
  Normal  SuccessfulCreate  51m   replicaset-controller  Created pod: nginx-65899c769f-qjlfj
  Normal  SuccessfulCreate  2m6s  replicaset-controller  Created pod: nginx-65899c769f-qptcl
  Normal  SuccessfulCreate  2m6s  replicaset-controller  Created pod: nginx-65899c769f-6pzwn

4. kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-65899c769f-6pzwn   1/1     Running   0          3m
nginx-65899c769f-qjlfj   1/1     Running   0          52m
nginx-65899c769f-qptcl   1/1     Running   0          3m

5.kubectl describe services nginx
Name:                     nginx
Namespace:                default
Labels:                   app=nginx
Annotations:              
Selector:                 run=nginx
Type:                     NodePort
IP:                       10.102.111.71
Port:                     http  8888/TCP
TargetPort:               80/TCP
NodePort:                 http  30001/TCP
Endpoints:                172.17.0.5:80,172.17.0.6:80,172.17.0.7:80
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   

5.kubectl get endpoints 
NAME         ENDPOINTS                                   AGE
kubernetes   192.168.99.100:8443                         23h
nginx        172.17.0.5:80,172.17.0.6:80,172.17.0.7:80   20m
nginx-wls    172.17.0.5:80,172.17.0.6:80,172.17.0.7:80   9m

6. kubectl get pods
NAME                     READY   STATUS        RESTARTS   AGE
nginx-65899c769f-6pzwn   0/1     Terminating   0          6m
nginx-65899c769f-qjlfj   1/1     Running       0          56m
nginx-65899c769f-qptcl   1/1     Running       0          6m
[root@wls yaml]# kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-65899c769f-qjlfj   1/1     Running   0          56m
nginx-65899c769f-qptcl   1/1     Running   0          6m

7. kubectl set image deploy nginx nginx=nginx:1.9.1
deployment.extensions/nginx image updated

8.  kubectl rollout history deployment nginx 
deployment.extensions/nginx 
REVISION  CHANGE-CAUSE
1         
2         

9.kubectl describe deployments nginx

Name:                   nginx
Namespace:              default
CreationTimestamp:      Sun, 28 Oct 2018 21:46:00 +0800
Labels:                 run=nginx
Annotations:            deployment.kubernetes.io/revision: 2
Selector:               run=nginx
Replicas:               2 desired | 2 updated | 2 total | 2 available | 0 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  25% max unavailable, 25% max surge
Pod Template:
  Labels:  run=nginx
  Containers:
   nginx:
    Image:        nginx:1.9.1
    Port:         
    Host Port:    
    Environment:  
    Mounts:       
  Volumes:        
Conditions:
  Type           Status  Reason
  ----           ------  ------
  Available      True    MinimumReplicasAvailable
  Progressing    True    NewReplicaSetAvailable
OldReplicaSets:  
NewReplicaSet:   nginx-76bc854778 (2/2 replicas created)
Events:
  Type    Reason             Age    From                   Message
  ----    ------             ----   ----                   -------
  Normal  ScalingReplicaSet  11m    deployment-controller  Scaled up replica set nginx-65899c769f to 3
  Normal  ScalingReplicaSet  5m19s  deployment-controller  Scaled down replica set nginx-65899c769f to 2
  Normal  ScalingReplicaSet  70s    deployment-controller  Scaled up replica set nginx-76bc854778 to 1
  Normal  ScalingReplicaSet  30s    deployment-controller  Scaled down replica set nginx-65899c769f to 1
  Normal  ScalingReplicaSet  30s    deployment-controller  Scaled up replica set nginx-76bc854778 to 2
  Normal  ScalingReplicaSet  24s    deployment-controller  Scaled down replica set nginx-65899c769f to 0

11. kubectl rollout undo deployment nginx   回滚
      deployment.extensions/nginx