nginx负载均衡器-Docker撰写 [英] nginx load balancer - Docker compose

问题描述

我有一个简单的flask应用程序运行在容器内的端口5000上，并且我试图添加nginx负载平衡来缩放该应用程序（3个实例）

I have a simple flask app running on port 5000 inside the container , and i'm trying to add nginx load balance to scale the app(3 instances)

这是我的 docker-compose 文件：

version: "3.7"

services: 
    chat-server:
        image: chat-server
        build: 
            context: .
            dockerfile: Dockerfile
        volumes: 
            - './chat_history:/src/app/chat_history'
        networks: 
            - "chat_net"

    ngnix-server:
        image: nginx:1.13
        ports: 
            - "8080:80"
        volumes: 
            - './ngnix.conf:/etc/ngnix/nginx.conf'
        networks: 
            - "chat_net"
        depends_on: 
            - chat-server

networks: 
    chat_net:

这是我的 nginx.conf 文件：

events { worker_connections 1024;}

http {
    upstream app {
        server chat-server_1:5000;
        server chat-server_2:5000;
        server chat-server_3:5000;

    }
}

server {
    listen 80;
    location / {
        proxy_pass http://app;
    }
}

两个服务都位于同一 chat_net 网络，但是当我在浏览器中点击 localhost：8080 时，却得到了nginx默认页面，为什么呢？我缺少什么？

both services are on the same chat_net network , but when i hit localhost:8080 on my browser im getting the nginx default page , why is that? what am i missing ?

推荐答案

您有错字，没有安装在 nginx.conf 文件正确。

You have a typo and are not mounting in your nginx.conf file correctly.

您在卷部分的几个位置将其拼写为 ngnix 并且该容器使用默认配置运行（因此使用默认主页）。

You spell it ngnix in a couple of places in your volumes section and the container runs with the default config (hence default home page).

一旦解决，您可能会遇到@Federkun提到的错误（ nginx 将无法解析这3个域名

Once you fix that, you will probably hit the error mentioned by @Federkun (nginx won't be able to resolve the 3 domain names you're proxying).

您还将 server 指令放置在错误的位置（它必须位于 http 部分）。

You also have your server directive in the wrong place (it needs to be within the http section).

这应该是文件的修改版本：

This should be the modified version of your file:

events { worker_connections 1024;}

http {
    upstream app {
        server chat-server:5000;
    }
    server {
        listen 80;
        location / {
            proxy_pass http://app;
        }
    }
}

请注意，这比需要更好 nginx 注意副本数。您可以使用-scale chat-server = N 运行 docker-compose up 并通过运行相同的命令随时调整大小不使用停机的其他 N 命令。

Notice this is better than needing nginx to be aware of the replica count. You can run docker-compose up with --scale chat-server=N and resize at anytime by running the same command with a different N without downtime.

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