diff --git a/cn/docs/tasks/run-application/run-stateless-application-deployment.md b/cn/docs/tasks/run-application/run-stateless-application-deployment.md new file mode 100644 index 0000000000..ef228f9d66 --- /dev/null +++ b/cn/docs/tasks/run-application/run-stateless-application-deployment.md @@ -0,0 +1,143 @@ +--- +title: 使用Deployment运行一个无状态应用 +--- + +{% capture overview %} + +本文介绍通过Kubernetes Deployment对象如何去运行一个应用. + +{% endcapture %} + + +{% capture objectives %} + +* 创建一个nginx deployment. +* 使用kubectl列举关于deployment信息. +* 更新deployment. + +{% endcapture %} + + +{% capture prerequisites %} + +{% include task-tutorial-prereqs.md %} + +{% endcapture %} + + +{% capture lessoncontent %} + +## 创建和探究一个nginx deployment + +你可以通过创建一个Kubernetes Deployment对象来运行一个应用, 可以在一个YAML文件中描述Deployment. 例如, 下面这个YAML文件描述了一个运行nginx:1.7.9 Docker镜像的Deployment: + +{% include code.html language="yaml" file="deployment.yaml" ghlink="/cn/docs/tasks/run-application/deployment.yaml" %} + + +1. 通过YAML文件创建一个Deployment: + + kubectl create -f https://k8s.io/docs/tasks/run-application/deployment.yaml + +1. 展示Deployment相关信息: + + kubectl describe deployment nginx-deployment + + user@computer:~/kubernetes.github.io$ kubectl describe deployment nginx-deployment + Name: nginx-deployment + Namespace: default + CreationTimestamp: Tue, 30 Aug 2016 18:11:37 -0700 + Labels: app=nginx + Annotations: deployment.kubernetes.io/revision=1 + Selector: app=nginx + Replicas: 2 desired | 2 updated | 2 total | 2 available | 0 unavailable + StrategyType: RollingUpdate + MinReadySeconds: 0 + RollingUpdateStrategy: 1 max unavailable, 1 max surge + Pod Template: + Labels: app=nginx + Containers: + nginx: + Image: nginx:1.7.9 + Port: 80/TCP + Environment: + Mounts: + Volumes: + Conditions: + Type Status Reason + ---- ------ ------ + Available True MinimumReplicasAvailable + Progressing True NewReplicaSetAvailable + OldReplicaSets: + NewReplicaSet: nginx-deployment-1771418926 (2/2 replicas created) + No events. + +1. 列出deployment创建的pods: + + kubectl get pods -l app=nginx + + NAME READY STATUS RESTARTS AGE + nginx-deployment-1771418926-7o5ns 1/1 Running 0 16h + nginx-deployment-1771418926-r18az 1/1 Running 0 16h + +1. 展示某一个pod信息: + + kubectl describe pod + + 该处 `` 指某一pod的名称. + +## 更新deployment + +你可以通过更新一个新的YAML文件来更新deployment. 下面的YAML文件指定该deployment镜像更新为nginx 1.8. + +{% include code.html language="yaml" file="deployment-update.yaml" ghlink="/cn/docs/tutorials/stateless-application/deployment-update.yaml" %} + +1. 应用新的YAML: + + kubectl apply -f https://k8s.io/docs/tutorials/stateless-application/deployment-update.yaml + +1. 查看该deployment创建的pods以新的名称同时删除旧的pods: + + kubectl get pods -l app=nginx + +## 通过增加副本数来弹缩应用 + +你可以通过应用新的YAML文件来增加Deployment中pods的数量. 该YAML文件将`replicas`设置为4, 指定该Deployment应有4个pods: + +{% include code.html language="yaml" file="deployment-scale.yaml" ghlink="/cn/docs/tutorials/stateless-application/deployment-scale.yaml" %} + +1. 应用新的YAML文件: + + kubectl apply -f https://k8s.io/docs/tutorials/stateless-application/deployment-scale.yaml + +1. 验证Deployment有4个pods: + + kubectl get pods -l app=nginx + + 输出的结果类似于: + + NAME READY STATUS RESTARTS AGE + nginx-deployment-148880595-4zdqq 1/1 Running 0 25s + nginx-deployment-148880595-6zgi1 1/1 Running 0 25s + nginx-deployment-148880595-fxcez 1/1 Running 0 2m + nginx-deployment-148880595-rwovn 1/1 Running 0 2m + +## 删除deployment + +通过名称删除deployment: + + kubectl delete deployment nginx-deployment + +## ReplicationControllers -- 旧的方式 + +创建一个多副本应用首选方法是使用Deployment,反过来使用ReplicaSet. 在Deployment和ReplicaSet加入到Kubernetes之前, 多副本应用通过[ReplicationController](/docs/concepts/workloads/controllers/replicationcontroller/)来配置. + +{% endcapture %} + + +{% capture whatsnext %} + +* 了解更多 [Deployment objects](/docs/concepts/workloads/controllers/deployment/). + +{% endcapture %} + +{% include templates/tutorial.md %}