nginx implements reverse proxy and load balancing

This article mainly introduces the implementation of reverse proxy and load balancing by nginx. It has certain reference value. Now I share it with you. Friends in need can refer to it.

Because it is simulated in a stand-alone environment Multiple server environment, so multiple tomcats open different ports to achieve

1. Reverse proxy

Goal: (When no port number is added, port 80 is accessed by default, so in one To achieve access to two domain names on a server, a reverse proxy is required)

1. Create tomcats directory

mkdir /usr/local/tomcats
tar -zxf apache-tomcat-7.0.47.tar.gz 
mv apache-tomcat-7.0.47 /usr/local/tomcats/tomcat1
cp -r tomcat1/ tomcat2
...

2. Modify the port

Involves three ports Modification: HTTP default port 8080 Remote server port 8005 AJP port 8009

vim conf/server.xml 
分别修改为8081  8006  8009
...

3. Simulate access to different domain names by modifying the host

这里有个小工具switchhsot可以方便的进行修改
(将ip+端口   分别与域名关联)

4. Modify nginx configuration

cd /usr/local/nginx/conf
vim nginx.conf

 upstream tomcatserver1{

server 47.94.14.93:8081;

   }
 upstream tomcatserver2{

    server 47.94.14.93:8082;

   } 
   server {
    listen       80;
    server_name  8081.kaka.com;

    #charset koi8-r;

    #access_log  logs/host.access.log  main;

    location / {
        proxy_pass http://tomcatserver1;
        index  index.html index.htm;
    }
}
  server {
    listen       80;
    server_name  8082.kaka.com;

    #charset koi8-r;

    #access_log  logs/host.access.log  main;

    location / {
        proxy_pass http://tomcatserver2;
        index  index.html index.htm;
    }
}

5. Visit the domain name set earlier and find that you can all access

2. Load balancing

1. Under the same domain name, one server can no longer meet our needs. You need multiple servers to distribute multiple requests to different servers to reduce the pressure on the server. At this time, you need load balancing

    （1）只需要在上面的反向代理的upstream中添加相应的server即可实现平均分配

    （2）有时候我们负载均衡服务器的性能不同，所以分配请求的权重不同

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