双nginx在一个Kubernetes荚中的应用

Question

我正在做一个关于google云中kubernetes的实验室，所以我的任务是在一个荚中部署两个nginx服务器，但是我有一个问题。

由于端口或IP正在使用购买另一个nginx容器，我需要在yaml文件中更改它，请给我一个解决方案，谢谢

apiVersion: v1
kind: Pod
metadata:
  name: two-containers
spec:

  restartPolicy: Never

  volumes:
  - name: shared-data
    emptyDir: {}

  containers:

  - name: first-container
    image: nginx
  - name: second-container
    image: nginx

E  nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

E  2019/01/21 11:04:47 [emerg] 1#1: bind() to 0.0.0.0:80 failed (98: Address already in use)

E  nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

E  2019/01/21 11:04:47 [emerg] 1#1: bind() to 0.0.0.0:80 failed (98: Address already in use)

E  nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

E  2019/01/21 11:04:47 [emerg] 1#1: bind() to 0.0.0.0:80 failed (98: Address already in use)

E  nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

E  2019/01/21 11:04:47 [emerg] 1#1: bind() to 0.0.0.0:80 failed (98: Address already in use)

E  nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

E  2019/01/21 11:04:47 [emerg] 1#1: still could not bind()

E  nginx: [emerg] still could not bind()

Answer 1

在kubernetes中，pods中的容器共享单个网络命名空间。为了简化，两个容器不能听同一个港口，在同一个吊舱。

因此，为了使两个nginx容器位于同一个吊舱内，您需要在不同的端口上运行它们。一个nginx可以在80上运行，另一个可以在81上运行。

因此，我们将使用默认的nginx配置运行first-container，对于second-container，我们将使用下面的配置运行。

• default.conf

server {
    listen       81;
    server_name  localhost;
    #charset koi8-r;
    #access_log  /var/log/nginx/host.access.log  main;

    location / {
    root   /usr/share/nginx/html;
    index  index.html index.htm;
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
    root   /usr/share/nginx/html;
    }

    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #    root           html;
    #    fastcgi_pass   127.0.0.1:9000;
    #    fastcgi_index  index.php;
    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    #    include        fastcgi_params;
    #}

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}

• 从这个default.conf创建一个configmap

kubectl create configmap nginx-conf --from-file default.conf

• 创建一个吊舱如下所示。

apiVersion: v1
kind: Pod
metadata:
  name: two-containers
spec:
  restartPolicy: Never
  volumes:
  - name: config
    configMap:
      name: nginx-conf
  containers:
  - name: first-container
    image: nginx
    ports:
    - containerPort: 80
  - name: second-container
    image: nginx
    ports:
    - containerPort: 81
    volumeMounts:
    - name: config
      mountPath: /etc/nginx/conf.d

• 展开吊舱。
• 现在，执行人员进入吊舱，并尝试在localhost:80和localhost:81上切换，它将工作。如果你需要更多的帮助，请告诉我。