Detailed introduction to TOMCAT cluster under NGINX reverse proxy in LINUX

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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 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

##Installed under /usr/local/

Extract tar -zxvf nginx-1.13.0.tar.gz

##Enter the directory and run ./configure to generate makefile

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 sbin directory execution./nginx

##View startup results

Window access 192.168.1.108 nginx default port is 80

Close ./nginx -s s

top

After closing, the corresponding data cannot be accessed at this time.

./nginx -s reload can reload the

configuration file after startup 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 and will not be described. . 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... and the other is 22222...

At this time, I am accessing a different IP address, and I have not yet configured Nginx as a reverse proxy server.

3. Nginx serves as a reverse proxy server

Mainly configure the contents of nginx.confa.

Configure server

group, add upstream configuration between http{} nodes.

192.168.1.168:9090 and 192.168.1.178:9191 are Tomcat 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http://lxstest)

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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