Merge pull request #5514 from jianglingxia/jlx-less

ZTE-SH-CN-run-application-run-stateless-application-deployment-pr-201…

cn/docs/tasks/run-application/run-stateless-application-deployment.md

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+---
+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:        <none>
+            Mounts:             <none>
+          Volumes:              <none>
+        Conditions:
+          Type          Status  Reason
+          ----          ------  ------
+          Available     True    MinimumReplicasAvailable
+          Progressing   True    NewReplicaSetAvailable
+        OldReplicaSets:   <none>
+        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 <pod-name>
+
+    该处 `<pod-name>` 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 %}