Qiming
9bf026e951
There are many YAML manifests sneaking into the `zh/docs/` directory. These files should go to the `zh/examples` directory instead. Having these "garbage" files (not referenced anywhere) is creating confusion for the release meister when merging branches. For example, some YAML files found in the 'master' branch are no longer there in the release-1.16 branch. It is tedious, if possible at all, to solve all this kind of conflicts during a rebase. The PR cleanses the zh/docs directory for all dangling YAML files.
145 lines
4.4 KiB
Markdown
145 lines
4.4 KiB
Markdown
---
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title: 使用Deployment运行一个无状态应用
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content_template: templates/tutorial
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---
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{{% capture overview %}}
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本文介绍通过Kubernetes Deployment对象如何去运行一个应用.
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{{% /capture %}}
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{{% capture objectives %}}
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* 创建一个nginx deployment.
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* 使用kubectl列举关于deployment信息.
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* 更新deployment.
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{{% /capture %}}
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{{% capture prerequisites %}}
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{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
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{{% /capture %}}
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{{% capture lessoncontent %}}
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## 创建和探究一个nginx deployment
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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:
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{{< codenew file="application/deployment.yaml" >}}
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1. 通过YAML文件创建一个Deployment:
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kubectl apply -f https://k8s.io/examples/application/deployment.yaml
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1. 展示Deployment相关信息:
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kubectl describe deployment nginx-deployment
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user@computer:~/website$ kubectl describe deployment nginx-deployment
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Name: nginx-deployment
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Namespace: default
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CreationTimestamp: Tue, 30 Aug 2016 18:11:37 -0700
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Labels: app=nginx
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Annotations: deployment.kubernetes.io/revision=1
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Selector: app=nginx
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Replicas: 2 desired | 2 updated | 2 total | 2 available | 0 unavailable
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StrategyType: RollingUpdate
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MinReadySeconds: 0
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RollingUpdateStrategy: 1 max unavailable, 1 max surge
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Pod Template:
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Labels: app=nginx
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Containers:
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nginx:
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Image: nginx:1.7.9
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Port: 80/TCP
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Environment: <none>
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Mounts: <none>
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Volumes: <none>
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Conditions:
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Type Status Reason
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---- ------ ------
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Available True MinimumReplicasAvailable
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Progressing True NewReplicaSetAvailable
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OldReplicaSets: <none>
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NewReplicaSet: nginx-deployment-1771418926 (2/2 replicas created)
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No events.
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1. 列出deployment创建的pods:
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kubectl get pods -l app=nginx
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NAME READY STATUS RESTARTS AGE
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nginx-deployment-1771418926-7o5ns 1/1 Running 0 16h
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nginx-deployment-1771418926-r18az 1/1 Running 0 16h
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1. 展示某一个pod信息:
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kubectl describe pod <pod-name>
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该处 `<pod-name>` 指某一pod的名称.
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## 更新deployment
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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.
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{{< codenew file="application/deployment-update.yaml" >}}
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1. 应用新的YAML:
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kubectl apply -f https://k8s.io/examples/application/deployment-update.yaml
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1. 查看该deployment创建的pods以新的名称同时删除旧的pods:
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kubectl get pods -l app=nginx
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## 通过增加副本数来弹缩应用
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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:
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{{< codenew file="application/deployment-scale.yaml" >}}
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1. 应用新的YAML文件:
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kubectl apply -f https://k8s.io/examples/application/deployment-scale.yaml
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1. 验证Deployment有4个pods:
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kubectl get pods -l app=nginx
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输出的结果类似于:
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NAME READY STATUS RESTARTS AGE
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nginx-deployment-148880595-4zdqq 1/1 Running 0 25s
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nginx-deployment-148880595-6zgi1 1/1 Running 0 25s
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nginx-deployment-148880595-fxcez 1/1 Running 0 2m
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nginx-deployment-148880595-rwovn 1/1 Running 0 2m
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## 删除deployment
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通过名称删除deployment:
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kubectl delete deployment nginx-deployment
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## ReplicationControllers -- 旧的方式
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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.
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{{% /capture %}}
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{{% capture whatsnext %}}
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* 了解更多 [Deployment objects](/docs/concepts/workloads/controllers/deployment/).
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{{% /capture %}}
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