How to configure the tomcat cluster under Nginx reverse proxy in Linux

nginx has the characteristics of reverse proxy (note the difference with forward proxy) and load balancing.

This time nginx is installed on the linux machine 192.168.1.108. To install nginx, you must first install the openssl library, gcc, pcre, zlib library, etc.

tomcat is installed on the two machines 192.168.1.168 and 192.168.1.178. The client accesses the project content deployed by tomcat in 192.168.1.168 and 192.168.1.178 by accessing the 192.168.1.108 reverse proxy.

1. Install nginx under linux (machine 192.168.1.108)

Install openssl library.

 yum install -y openssl openssl-devel

Need to install gcc: yum install gcc-c

##Install pcre yum install -y pcre pcre-devel

Install zlib library yum install -y zlib zlib-devel

Download nginx: wget

Installed under /usr/local/

Unzip tar -zxvf nginx-1.13.0.tar.gz

Enter the directory and run ./configure to generate makefile

At this time, there is an extra makefile in the directory

Compile make

Installation: make install

After completion, there will be an additional nginx in the local directory

Start nginx

Enter the sbin directory and execute ./nginx

View the startup results

window access 192.168.1.108 nginx default port is 80

Close ./nginx -s stop

After closing, the response will not work at this time. Visit

./nginx -s reload You can reload the configuration file after startup. It is suitable for modifying the configuration file during startup

2. Install tomcat under Linux (192.168.1.168 and 192.168.1.178 machines)

The installation process is very simple, I won’t go into details. Install tomcat on the other two Linux machines (192.168.1.168 and 192.168.1.178), and deploy any project nginxtest. One content is 1111.... The other is 22222....

At this time, the access is to a different IP address, and nginx has not been configured as a reverse proxy server.

3. nginx serves as a reverse proxy server

Mainly configure the contents in nginx.conf

a. Configure the server group in http{} Add upstream configuration between nodes.

192.168.1.168:9090 and 192.168.1.178:9191 are the tomcats of the other two Linux machines (see 2 above)

   upstream lxstest{ 

        server 192.168.1.168:9090;

        server 192.168.1.178:9191;

      }

b. 修改nginx监听的端口号80，改为7777(随便改个都行，不改也行)。 

 server {

  listen    7777;

  ......

}

c. 在location{}中，利用proxy_pass配置反向代理地址；此处“http://”不能少，后面的地址要和第一步upstream定义的名称保持一致。(上述的是  lxstest，所以)

 location / { 

      root  html;

      index index.html index.htm;

       proxy_pass http://lxstest; 

    }

上述修改完后，启动 192.168.1.108机器的nginx

最后访问 192.168.1.108:7777/nginxtest   同一个地址出来不同的页面，说明一会儿访问的是192.168.1.168，一会儿访问的是192.168.1.178

 

http://192.168.1.108:7777 

等同于====   

等同于===== 

最后就会找到对应的tomcat

再找到对应的nginxtest工程.

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