How to build a high-performance load balancing cluster of Nginx+Tomcat

nginx is a high-performance http server/reverse proxy server and email (imap/pop3) proxy server. It occupies less memory, has strong concurrency capabilities, and performs better among web servers of the same type. nginx can be compiled and run on most unix linux os, and there is a windows ported version. In general, for new sites, it is recommended to use the latest stable version as the production version.

The maximum number of online visits supported by a single tomcat is about 500. To support more visits, one tomcat cannot do it. Here we use cluster deployment, use multiple tomcats, and use nginx as the reverse proxy.

The architecture is as follows:

Preparation work

apache-tomcat-7.0.61

nginx-1.12.2

redis-x64-3.2.100

To simplify the example, here we only talk about the deployment and integration of nginx tomcat.

nginx installation

(1) Go to the official website to download the latest stable version of nigx for windows (I use version 1.12.2).

(2) Unzip to any directory on the disk. Here I unzip it in f:\nginx-1.12.2

(3) Start the service: start nginx.exe

Stop the service: nginx -s stop

Reload the configuration : nginx -s reload

Modify nginx.conf

1. Number of processes and the maximum number of connections per process

• nginx process number, it is recommended to set it equal to the total number of cpu cores

• The maximum number of connections for a single process. Then the maximum number of connections to the server = number of connections * number of processes

2. Basic configuration of nginx

• The listening port is generally the http port: 80

• There can be multiple domain names, separated by spaces. For example, server_name www.sohu.com baidu,com

##3. Basic configuration of load balancing list

• location / {}: What kind of suffix is ​​required for load balancing? If we want to load balance all files with aspx suffix, we can write like this: location ~.*\.aspx${}

• proxy_pass: Requests are directed to a custom server list. Here we redirect all requests to the load balancing server list identified as http://joannayan.com.

• weight weight, the higher the weight, the greater the chance of being assigned. The weight can be defined based on the machine configuration (if a server's hardware configuration is very good and can handle more requests, then a higher weight can be set for it; and if a server's hardware configuration is poor, then the previous weight can be set. The weight configuration of one unit is weight=2, and the weight configuration of the latter unit is weight=1).

Test

Deploy the testnginx.war web project to the tomcat servers of the two machines respectively (In order to distinguish that different web servers are accessed, the testnginx project deployed in the two machines has slightly different page display).

Start tomcat on both machines and start nginx.

Access nginx: http://localhost/testnginx

Refresh and visit again:

#Due to different weights, the possibility of displaying "5.20 Server" will increase during the process of continuously refreshing the page. Bigger.

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