Kubernetes使用命令行实现副本的管理

最新推荐文章于 2025-05-14 05:28:54 发布

你怎么穿品如的衣服

最新推荐文章于 2025-05-14 05:28:54 发布

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文章标签： kubernetes

本文链接：https://blog.youkuaiyun.com/tracert192/article/details/108297813

本文介绍了如何使用kubectl命令行工具进行Kubernetes资源管理，包括创建deployment和服务，增减副本，更新镜像，回滚操作，以及将服务类型从ClusterIP改为NodePort。适合初学者快速上手Kubernetes。

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前言：为了更好地的理解Kubernetes，我们平时在写yaml文件的时候可以直直接使用kubectl的一些命令直接创建，好处是能够快速的创建我们需要的资源类型，坏处是他的可定制性没有直接写yaml文件高。

step1创建deployment并创建service

[root@k8s-master ~]# kubectl run myapp --image=ikubernetes/myapp:v1 --replicas=2
[root@k8s-master ~]# kubectl expose deployment myapp --name=myapp --port=80
service/myapp exposed
[root@k8s-master ~]# kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP   39d
myapp        ClusterIP   10.96.88.100    <none>        80/TCP    5s
[root@k8s-master ~]# curl 10.96.88.100
Hello MyApp | Version: v1 | <a href="hostname.html">Pod Name</a>
[root@k8s-master ~]# curl 10.96.88.100/hostname.html
myapp-7c468db58f-xrmqx
[root@k8s-master ~]# curl 10.96.88.100/hostname.html
myapp-7c468db58f-rdpkq
[root@k8s-master ~]#

总结：clusterIP的service类型只能在集群内部访问，而且访问的方式是轮询

step2增加副本

[root@k8s-master ~]# kubectl scale --replicas=5 deployment myapp
deployment.apps/myapp scaled
[root@k8s-master ~]# kubectl get pod
NAME                         READY   STATUS    RESTARTS   AGE
myapp-7c468db58f-84c4k       1/1     Running   0          8s
myapp-7c468db58f-dvll2       1/1     Running   0          8s
myapp-7c468db58f-qx45d       1/1     Running   0          8s
myapp-7c468db58f-rdpkq       1/1     Running   0          11m
myapp-7c468db58f-xrmqx       1/1     Running   0          11m

step3减少副本

[root@k8s-master ~]# kubectl scale --replicas=3 deployment myapp
deployment.apps/myapp scaled
[root@k8s-master ~]# kubectl get pod
NAME                         READY   STATUS    RESTARTS   AGE
myapp-7c468db58f-dvll2       1/1     Running   0          60s
myapp-7c468db58f-rdpkq       1/1     Running   0          12m
myapp-7c468db58f-xrmqx       1/1     Running   0          12m

step4镜像的更新

[root@k8s-master ~]# kubectl set image deployments.apps myapp myapp=ikubernetes/myapp:v2
deployment.apps/myapp image updated
[root@k8s-master ~]# kubectl get pod
NAME                         READY   STATUS    RESTARTS   AGE
myapp-64758bffd4-7w2vc       1/1     Running   0          5s
myapp-64758bffd4-frgpq       1/1     Running   0          6s