Nginx Configuration of loading balance

最新推荐文章于 2024-12-18 17:26:35 发布

yexianyi

最新推荐文章于 2024-12-18 17:26:35 发布

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分类专栏： Nginx 文章标签： Nginx Load balance Docker

本文链接：https://blog.youkuaiyun.com/yexianyi/article/details/81252972

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本文介绍如何使用Docker快速部署四个Spring Boot应用服务器，并通过Nginx实现Round-Robin轮询策略进行负载均衡。文章详细展示了配置过程，包括设置四个节点服务器、配置Nginx上游服务器池以及测试负载均衡效果。

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Abstract:

This example will show how to config a simple Nginx loading balance with Round-Robin policy, which involves 4 node servers to run web app and 1 nginx server to do load balance. Now, I will demonstrate this case with Docker.

Configuration:

1. Setup 4 app servers

Since I already programmed a simple web app with Springboot and published it as Docker Image, it is quite easy to launch the 4 node servers by calling following commands in 4 times.

docker run -it -d yexianyi/chukonu-springboot

If we exec to these nodes, we will get their service urls:

http://172.17.0.3:9000
http://172.17.0.4:9000
http://172.17.0.5:9000
http://172.17.0.6:9000

2. Setup and config Nginx

1) The installation process will be ignored and you may refer to my pervious blog for details.

2) config /etc/nginx/nginx.conf

2.1) create upstream under http section:

upstream tomcat-pool {
      server 172.17.0.3:9000;
      server 172.17.0.4:9000;
      server 172.17.0.5:9000;
      server 172.17.0.6:9000;
}

Note that underline "_" is not supported, so we use dash "-" instead.

2.2) Config Server Section

server {
        listen  8080;
        server_name localhost;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        location / {
                proxy_pass http://tomcat-pool;
        }

    #Other config are ignored
    #...

}

listen: the port number will be used for access service.

server_name: the server address will be used for access service.

proxy_pass: the upstream name we create in step 2.1.

2.3) Save above update

2.4) Refresh config by invoking following command

/usr/sbin/nginx -s reload

3. Testing

Now, there is a rest service published on endpoint http://<server_ip>:<port>/function/local_ip, which will display the underlying server address. For example, if we call http://localhost:8080/function/local_ip several times, the result should be populated from 172.17.0.3 to 172.17.0.6 in a RR way, such as

{"address":"172.17.0.3"}
{"address":"172.17.0.4"}
{"address":"172.17.0.5"}
{"address":"172.17.0.6"}
{"address":"172.17.0.3"}
{"address":"172.17.0.4"}
{"address":"172.17.0.5"}
{"address":"172.17.0.6"}
{"address":"172.17.0.3"}