expose¶

expose用于创建一个service，将deployment管理的pod的端口给映射到service上。

这里我们先创建一个deployment

$ kubectl run nginx-deploy --image=nginx:1.14-alpine --port=80 --replicas=2

然后我们将这个名为nginx-deploy的deployment给暴露出来，放到service里。

以下命令中，–target-port=80 表示目标deployment里的pod提供服务的端口是80， –port=8000 表示service这里提供服务的端口是8000.

$ kubectl expose deployment nginx-deploy --name=nginx --port=8000 --target-port=80 --protocol=TCP

然后我们查看一下，确认service创建完成，而且可以访问。

[root@k8s1 ~]# kubectl get service
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP    5h
nginx        ClusterIP   10.110.69.178   <none>        8000/TCP   1m
[root@k8s1 ~]# curl 10.110.69.178:8000
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>