Nginx Plus 无法使用 Docker 嵌入式 DNS 服务器解析服务

Question

我在 windows 10 上的 docker 集群模式下有一个 nginxplus 容器和一个演示服务运行。

我将端点模式用作演示服务的 dnsrr，以便 nginx 可以使用 docker DNS 服务器作为演示服务的解析器。

但是我在 nginxplus 日志中收到一条错误消息 "service http of demosvcalias could not be resolved (3: Host not found)"

Docker resolv.conf 将 127.0.0.11 显示为看起来正确的名称服务器。

  **docker exec -it b7665155d8e0 cat /etc/resolv.conf**
  search xxx.com dev.xxx.com
  nameserver 127.0.0.11
  options ndots:0

docker-撰写演示服务

version: "3.3"
services:
  demosvc:
    image: demo:latest
    deploy:
      endpoint_mode: dnsrr
      replicas: 1
      resources:
        limits:
          cpus: "0.1"
          memory: 5000M
      restart_policy:
        condition: on-failure
    #ports:
      #- "8081:8080"
    networks:
      my-swarm-network : 
           aliases:
             - demosvcalias
networks:
  my-swarm-network:
    external: true

docker-compose for nginx plus

version: "3"
services:
  nginxp:        
    image: nginxp:latest
    deploy:
      replicas: 1
      resources:
        limits:
          cpus: "0.1"
          memory: 5000M
      restart_policy:
        condition: on-failure
    ports:
      - "80:80"
    networks:
      - my-swarm-network
networks:
  my-swarm-network:
    external: true

nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
    resolver 127.0.0.11 valid=60s ipv6=off;

    server {        
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index index.html;
        }
        location /demo {        
            proxy_pass http://demobackend;       
        }

    }
    upstream demobackend {
            zone backend 32k;
            server demosvcalias service=http resolve;           
    }



}

我还可以使用 docker exec 实用程序从 nginx 容器中卷曲 http://demosvscalias:8080/demo.html。但是 nginx 解析器无法使用 Docker 嵌入式 DNS 服务器 (127.0.0.11) 解析 demosvc。

我在这里遗漏了什么吗？

更新：在以下更新后，负载平衡在 docker 嵌入式 DNS 服务器作为解析器时工作正常。

在nginx.conf

server demosvcalias service=http resolve ==> server demosvcalias:8080 resolve;

已更新nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    log_format upstreamlog '[$time_local] $remote_addr - $remote_user - $server_name  to: $upstream_addr: $request upstream_response_time $upstream_response_time msec $msec request_time $request_time';
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
    resolver 127.0.0.11 valid=60s ipv6=off;
    resolver_timeout      10s;

    server {        
        access_log /var/log/nginx/access.log upstreamlog;
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index index.html;
        }
        location /demo {        
            proxy_pass http://demobackend;       
        }

    }
    upstream demobackend {
            zone backend 32k;
            server demosvcalias:8080 resolve;           
    }

}

Answer 1

以下更新后，负载平衡在 docker 嵌入式 DNS 服务器作为解析器时工作正常。

在nginx.conf

server demosvcalias service=http resolve ==> server demosvcalias:8080 resolve;

已更新nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    log_format upstreamlog '[$time_local] $remote_addr - $remote_user - $server_name  to: $upstream_addr: $request upstream_response_time $upstream_response_time msec $msec request_time $request_time';
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
    resolver 127.0.0.11 valid=60s ipv6=off;
    resolver_timeout      10s;

    server {        
        access_log /var/log/nginx/access.log upstreamlog;
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index index.html;
        }
        location /demo {        
            proxy_pass http://demobackend;       
        }

    }
    upstream demobackend {
            zone backend 32k;
            server demosvcalias:8080 resolve;           
    }

}

我将不得不详细了解 service=http 导致问题的原因。不确定是由于我使用的 Nginxplus 版本还是其他原因。如果我发现任何东西会更新

Nginx Plus 无法使用 Docker 嵌入式 DNS 服务器解析服务

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