kubernetes集群发布 Pod 端口

kubernetes集群发布Pod 端口创建测试环境vi nginx.yamlapiVersion: apps/v1kind: Deploymentmetadata:  name: my-nginxspec:  selector:    matchLabels:      run: my-nginx  replicas: 2  template:    metadata:      labels:        run: my-nginx    spec:      containers:      - name: my-nginx        image: nginx        ports:        - containerPort: 80验证服务启动[root@kubm-02 ~]# kubectl get podsNAME                        READY   STATUS    RESTARTS   AGEmy-nginx-756fb87568-jwgp8   1/1     Running   0          64smy-nginx-756fb87568-vshxc   1/1     Running   0          64s[root@kubm-02 ~]# [root@kubm-02 ~]# kubectl get pods -l run=my-nginx -o wideNAME                        READY   STATUS    RESTARTS   AGE     IP             NODE         NOMINATED NODE   READINESS GATESmy-nginx-756fb87568-jwgp8   1/1     Running   0          2m12s   10.244.3.101   kubnode-01   <none>           <none>my-nginx-756fb87568-vshxc   1/1     Running   0          2m12s   10.244.4.123   kubnode-02   <none>           <none>检查 Pod 的 IP 地址：[root@kubm-02 ~]# kubectl get pods -l run=my-nginx -o yaml | grep podIP    podIP: 10.244.3.101    podIP: 10.244.4.123创建 ServiceKubernetes Service 从逻辑上定义了运行在集群中的一组 Pod，这些 Pod 提供了相同的功能。 当每个 Service 创建时，会被分配一个唯一的 IP 地址（也称为 clusterIP）。 这个 IP 地址与一个 Service 的生命周期绑定在一起，当 Service 存在的时候它也不会改变。 可以配置 Pod 使它与 Service 进行通信，Pod 知道与 Service 通信将被自动地负载均衡到该 Service 中的某些 Pod 上。
创建nginx 服务kubectl expose 命令为 2个 Nginx 副本创建一个 Service：
[root@kubm-02 ~]# kubectl expose deployment/my-nginxservice/my-nginx exposed验证服务启动[root@kubm-02 ~]# kubectl  get svcNAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGEmy-nginx     ClusterIP   10.245.206.203   <none>        80/TCP    2m36s查看详细信息[root@kubm-02 ~]# kubectl describe svc my-nginx Name:              my-nginxNamespace:         defaultLabels:            <none>Annotations:       <none>Selector:          run=my-nginxType:              ClusterIPIP:                10.245.206.203Port:              <unset>  80/TCPTargetPort:        80/TCPEndpoints:         10.244.3.101:80,10.244.4.123:80Session Affinity:  NoneEvents:            <none>kubectl describe po my-nginx # 查看my-nginx pod的详细状态kubectl describe rs my-nginx # 查看my-nginx replica set的详细状态kubectl describe deployment my-nginx # 查看my-nginx deployment的详细状态访问 ServiceKubernetes 支持两种主要的服务发现模式 —— 环境变量和 DNS。前者在单个节点上可用使用，然而后者必须使用 kube-dns 集群插件。
[root@kubm-02 ~]# kubectl get podsNAME                        READY   STATUS    RESTARTS   AGEmy-nginx-756fb87568-jwgp8   1/1     Running   0          23mmy-nginx-756fb87568-vshxc   1/1     Running   0          23m[root@kubm-02 ~]# kubectl exec my-nginx-756fb87568-jwgp8 -- printenv | grep SERVICE                         KUBERNETES_SERVICE_HOST=10.245.0.1KUBERNETES_SERVICE_PORT=443KUBERNETES_SERVICE_PORT_HTTPS=443DNS 解析测试Kubernetes 提供 DNS ，如果它在集群中处于运行状态，可以通过如下命令来检查：
[root@kubm-02 ~]# kubectl get services kube-dns --namespace=kube-systemNAME       TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)                  AGEkube-dns   ClusterIP   10.245.0.10   <none>        53/UDP,53/TCP,9153/TCP   11d验证服务解析启动一个安装有curl 的镜像[root@kubm-02 ~]# kubectl run curl --image=radial/busyboxplus:curl -i --tty测试解析 my-nginx[ root@curl-6bf6db5c4f-96nhg:/ ]$ nslookup my-nginxServer:    10.245.0.10                                          《==== dns 服务器Address 1: 10.245.0.10 kube-dns.kube-system.svc.cluster.localName:      my-nginxAddress 1: 10.245.206.203 my-nginx.default.svc.cluster.local    《==== my-nginx服务的集群IP地址[ root@curl-6bf6db5c4f-96nhg:/ ]$ curl 测试[ root@curl-6bf6db5c4f-96nhg:/ ]$ curl my-nginx ........<h2>Welcome to nginx!</h2>.........[ root@curl-6bf6db5c4f-96nhg:/ ]$ curl 10.245.206.203........<h2>Welcome to nginx!</h2>......服务资源扩容收缩服务[root@kubm-02 ~]# kubectl scale deployment my-nginx --replicas=0验证[root@kubm-02 ~]# kubectl get pods -o wideNo resources found.
扩容服务至2节点[root@kubm-02 ~]# kubectl scale deployment my-nginx --replicas=2deployment.extensions/my-nginx scaled验证[root@kubm-02 ~]# kubectl get pods -o wide                      NAME                        READY   STATUS              RESTARTS   AGE   IP       NODE         NOMINATED NODE   READINESS GATESmy-nginx-756fb87568-gmgfq   0/1     ContainerCreating   0          1s    <none>   kubnode-02   <none>           <none>my-nginx-756fb87568-gvhbm   0/1     ContainerCreating   0          1s    <none>   kubnode-01   <none>           <none>清理服务#直接使用配置文件删除[root@kubm-02 ~]# kubectl delete -f nginx.yaml    deployment.apps "my-nginx" deleted#删除服务[root@kubm-02 ~]# kubectl get svcNAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGEkubernetes   ClusterIP   10.245.0.1       <none>        443/TCP   11dmy-nginx     ClusterIP   10.245.206.203   <none>        80/TCP    48m[root@kubm-02 ~]# kubectl delete  svc my-nginx service "my-nginx" deleted[root@kubm-02 ~]# kubectl get svc              NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGEkubernetes   ClusterIP   10.245.0.1   <none>        443/TCP   11d  

使用互联网访问海外带宽网络，因中国的网民用户较多，总国际出口有限，因此很难保证每一个用户访问海外AWS都很快。