项目环境搭建【Docker+k8s】九 || kubernetes创建容器
目录
创建容器
命令中--replicas=2 启动2个实例,--port=80 运行在k8s的80端口上,没有进行映射端口
[ ~]# kubectl run nginx --image=nginx --replicas=2 --port=80 #输出如下: kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead. deployment.apps/nginx created
查看全部Pods状态
[ ~]# kubectl get pods #输出如下: NAME READY STATUS RESTARTS AGE nginx-5578584966-2tkmz 1/1 Running 0 79s nginx-5578584966-8r8jt 1/1 Running 0 79s
查看已部署的服务
[ ~]# kubectl get deployment #输出如下: NAME READY UP-TO-DATE AVAILABLE AGE nginx 2/2 2 2 2m17s
发布服务
使用负载均衡模式发布服务,让用户可以访问。暴露一个名称为nginx的deployment,暴露80端口,类型是负载均衡
[ ~]# kubectl expose deployment nginx --port=80 --type=LoadBalancer #输出如下: service/nginx exposed
查看已发布的服务
[ ~]# kubectl get service #输出如下 NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 9h nginx LoadBalancer 10.106.9.160 <pending> 80:31176/TCP 2m9s
其中nginx的port:80为k8s的端口,31176为暴露出来的端口
查看服务详情
[ ~]# kubectl get service #输出如下 NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 9h nginx LoadBalancer 10.106.9.160 <pending> 80:31176/TCP 2m9s #查看详情 [ ~]# kubectl describe service nginx Name: nginx Namespace: default Labels: run=nginx Annotations: <none> Selector: run=nginx Type: LoadBalancer IP: 10.106.9.160 #k8s内部ip地址 Port: <unset> 80/TCP #k8s内部端口 TargetPort: 80/TCP NodePort: <unset> 31176/TCP #node端口 Endpoints: 192.168.114.193:80,192.168.170.4:80 Session Affinity: None External Traffic Policy: Cluster Events: <none>
验证是否成功
master在默认情况下不会运行pod,所以在node节点访问nginx进行验证,也可使用docker ps查看运行的容器。
服务高可用测试:使用docker rm -f 容器id删除容器,删除后容器又自动创建。
#访问测试 http://192.168.101.31:31176/ http://192.168.101.32:31176/
停止服务
- service是服务,对外提供服务
- deployment是部署
- pod运行容器的单元
容器运行在pod上,pod运行在deployment上,停止服务,必须先停止deployment
删除已部署的服务
[ ~]# kubectl delete deployment nginx #输出如下: deployment.apps "nginx" deleted
删除已发布的服务
[ ~]# kubectl delete service nginx #输出如下: service "nginx" deleted
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