kubernetes 学习笔记3

时间：2017-03-01 19:45:49 阅读：350 评论：0 收藏：0 [点我收藏+]

标签：失败 blog set tor 学习 images wait 升级 time

kubernetes 自动发布和回滚

deployment 引入的目的是为了更好的解决pod的编排问题。

创建一个deployment对象来生成对应的replica set 并完成 pod副本的创建过程
检查deployment的状态来看部署动作是否完成（pod副本的数量是否达到预期的值）
更新deployment以创建新的pod（比如镜像升级）
如果当前deployment不稳定，则回滚至一个早先的deployment版本

创建deployment

$ kubectl create -f docs/user-guide/nginx-deployment.yaml --record
deployment "nginx-deployment” created

查看正在创建或者正在更新的deplyment

$ kubectl get deployments
NAME               DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3         0         0            0           1s

$ kubectl get deployments
NAME               DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3         3         3            3           18s

查看replica set 和 pod

$ kubectl get rs
NAME                          DESIRED   CURRENT   AGE
nginx-deployment-2035384211   3         3         18s

查看生成的各个pod的归属关系

$ kubectl get pods --show-labels
NAME                                READY     STATUS    RESTARTS   AGE       LABELS
nginx-deployment-2035384211-7ci7o   1/1       Running   0          18s       app=nginx,pod-template-hash=2035384211
nginx-deployment-2035384211-kzszj   1/1       Running   0          18s       app=nginx,pod-template-hash=2035384211
nginx-deployment-2035384211-qqcnn   1/1       Running   0          18s       app=nginx,pod-template-hash=2035384211

查看deployment的状态

$ kubectl rollout status deployment/nginx-deployment
deployment "nginx-deployment" successfully rolled out

更新deployment

当deployment 里面的pod模版更改了

label更新了

容器镜像改变了，那么会触发deployment重新发布，如果deployment进行扩展，那么不会触发deployment

可以直接写命令进行更改

kubectl set image deployment/nginx-deployment nginx=nginx:1.9.1
deployment "nginx-deployment" image updated

也可以进行编辑进行更改

$ kubectl edit deployment/nginx-deployment
deployment "nginx-deployment" edited

查看发布的状态

$ kubectl rollout status deployment/nginx-deployment
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
deployment "nginx-deployment" successfully rolled out

如果发布成功

$ kubectl get deployments
NAME               DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3         3         3            3           36s

$ kubectl get rs
NAME                          DESIRED   CURRENT   AGE
nginx-deployment-1564180365   3         3         6s
nginx-deployment-2035384211   0         0         36s

$ kubectl get pods
NAME                                READY     STATUS    RESTARTS   AGE
nginx-deployment-1564180365-khku8   1/1       Running   0          14s
nginx-deployment-1564180365-nacti   1/1       Running   0          14s
nginx-deployment-1564180365-z9gth   1/1       Running   0          14s

更新pod，我们只需更新deployment里面的templement

当我们更新deployment时候，当有合适的pod产生的时候，k8s才会删除老的pod，当老的pod被删除足够多时，才会继续产生新的pod

deployment 回滚

查看deployment详细信息

$ kubectl describe deployment

查看deployment的发布历史

$ kubectl rollout history deployment/nginx-deployment

可以回滚至任一个之前的版本

$ kubectl rollout undo deployment/nginx-deployment
deployment "nginx-deployment" rolled back

$ kubectl rollout undo deployment/nginx-deployment --to-revision=2
deployment "nginx-deployment" rolled back

扩展deployment

ou can scale a Deployment by using the following command:

$ kubectl scale deployment nginx-deployment --replicas 10
deployment "nginx-deployment" scaled

$ kubectl autoscale deployment nginx-deployment --min=10 --max=15 --cpu-percent=80
deployment "nginx-deployment" autoscaled

暂停或者回复一个deployment

$ kubectl set image deployment/nginx-deployment nginx=nginx:1.9.1; kubectl rollout pause deployment/nginx-deployment
deployment "nginx-deployment" image updated
deployment "nginx-deployment" paused

deployment的状态

deployment为processing状态的情况为：

1.deployment正在创建rs

2.deployment正在扩展或者删除rs

deploymen为什么会失败

Insufficient quota
Readiness probe failures
Image pull errors
Insufficient permissions
Limit ranges
Application runtime misconfiguration

kubernetes 学习笔记3

标签：失败 blog set tor 学习 images wait 升级 time

原文地址：http://www.cnblogs.com/leidaxia/p/6485618.html

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