docker - nginx反向代理到可能已脱机的docker

Question

我尝试生成一个Nginx docker ，它将我的请求重定向到其他 docker 。

但是其他Docker可能会脱机。

从我的nginx docker分层时，出现以下错误:

"host not found in upstream "es_dev" in "/etc/nginx/nginx.conf"

是否可以通过这种方式运行Nginx？并且，如果其中一个docker没有启动，则显示html-error-page？

这是我的配置文件:

http {

  server {
    listen      80;
    server_name XXXXXXXXXXXXX.de;
    rewrite     ^   https://$server_name$request_uri? permanent;
  }

  server {
    listen 443;
    ssl    on;
    ssl_certificate    /etc/ssl/XXXXXXXXXXXXX.crt;
    ssl_certificate_key    /etc/ssl/XXXXXXXXXXXXX.key;
    ssl_client_certificate /etc/ssl/XXXXXXXXXXXXX.crt;
    ssl_verify_client on;
    ssl_verify_depth 2;

    location /dev/ {
      proxy_pass http://dev:200/;
      resolver 127.0.0.11;
    }
    location /staging/ {
      proxy_pass http://staging:200/;
      resolver 127.0.0.11;
    }
    location /live/ {
      proxy_pass http://live:200/;  
      resolver 127.0.0.11;
    }
  }
}

2017:10.19:

首先我跑:

docker run --name nginx -v /var/run/docker.sock:/tmp/docker.sock -d -p 80:80 -p 443:443 nginx

然后:

docker run --link=nginx --name dev -d image1

结果:Nginx返回502-错误的网关

Answer 1

当您将解析器resolver 127.0.0.11;添加到您的位置时，当另一个容器不可用时，nginx将启动。

您的配置必须如下所示:

http {

  server {
    listen      80;
    server_name XXXXXXXXXXXXX.de;
    rewrite     ^   https://$server_name$request_uri? permanent;
  }

  server {
    listen 443;
    ssl    on;
    ssl_certificate    /etc/ssl/XXXXXXXXXXXXX.crt;
    ssl_certificate_key    /etc/ssl/XXXXXXXXXXXXX.key;
    ssl_client_certificate /etc/ssl/XXXXXXXXXXXXX.crt;
    ssl_verify_client on;
    ssl_verify_depth 2;

    location /dev/ {
      proxy_pass http://dev:200/;
      resolver 127.0.0.11;
    }
    location /staging/ {
      proxy_pass http://staging:200/;
      resolver 127.0.0.11;
    }
    location /live/ {
      proxy_pass http://live:200/;  
      resolver 127.0.0.11;
    }
  }
}

127.0.0.11是嵌入式docker DNS服务器