How to implement Nginx reverse proxy for multiple servers

Nginx reverse proxy multiple servers, which means that when we initiate different requests to nginx, nginx will forward them to different servers according to the different requests. As shown in the figure below, when we access resource a through port 8000, nginx will forward the request to server 8080, and when accessing resource b, it will forward it to server 8081.

Let's do some preparation first. First, prepare two tomcat servers, port 8080 and port 8081. Port 8080 is the default. Here we modify port 8081. First, we go to the conf directory under tomcat, enter the server.xml file and make the following two changes:

1. Change the shutdown port number to 8015

2. Change the start port number to 8081

Now we have two tomcats. Next, we start the two tomcats to see if they can be accessed. If not, it may be a problem with your firewall. systemctl stop firewalld can shut down the firewall. If still not accessible, it may be that Alibaba Cloud has not opened the port.

When your tomcat can be accessed normally, we deploy resource a on server 8080 and resource b on server 8081. The specific deployment is to create directories a and b respectively in the webapps directory under tomcat, and create index.html, write 8080 and 8081 respectively in it, for the convenience of testing later. Here is resource a

OK, the next step is to configure nginx. Go to the conf directory of nginx, open the nginx.conf file, and manually configure a server block

The server means:

• listen 8000: listen to port 8000, which is the nginx port we directly access
• server_name localhost: is the domain name
• location ~ /a/: all requests to access resource a will be forwarded through the following proxy
• http://39.106.231.3:8080; means the proxy forwards to the 8080 server under the host with the IP address 39.106.231.3

After configuration, execute ./nginx -s reload in the sbin directory to reload the configuration file.

Access: 39.106.231.3:8000/a

Access: 39.106.231.3:8000/b

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