Guide to Porting and Configuring Nginx on OKMX6ULx Embedded Linux (Kernel 4.1.15)

Nginx (engine x) is an open-source, high-performance Web server, reverse proxy server, load balancer, and HTTP cache server. It is characterized by low memory usage and strong concurrency ability. In fact, Nginx performs well in terms of concurrency among web servers of the same type. It is developed using the C programming language.

Nginx is specifically developed for performance optimization. Performance is an important consideration in its design. It focuses highly on efficiency in implementation and can withstand high-load tests, supporting up to 50,000 concurrent connections.

1.1 Compile nginx-1.8 in Yocto

Execute the following commands for compilation:

During the compilation process, the following errors appeared:

Solution:

Modify the build_x11/conf/bblayers.conf file and add the source code path of Nginx to the file. build_x11 is the installation and compilation path defined by yourself.

Modify the content as follows:

After adding, execute bitbake nginx again for compilation.

1.2 Package the Image

After compilation, go to the

path to package the image.

1.3 Transplant

Extract the image packaged in the previous step to the root path of the system.

2.1 Reverse Proxy

2.1.1 Tomcat Installation

① Install the JDK environment

Download address: Oracle JDK 8 Downloads

Download the following two files:

and

Extract them to the development board:

Extract the above two compressed packages to /home/root/jdk1.8.0_151.

Modify the environment variables:

Add the following content at the end of the /etc/profile file:

Execute the following command to make the environment variables take effect immediately:

Verify whether the installation is successful:

Enter the following command to check the Java version:

② Install Tomcat

Download the source code: Tomcat 9.0 Downloads. Here, download version 9.0.108.

Extract the downloaded

to the

path on the development board.

Start the Tomcat service:

After starting, enter 192.168.1.13:8080 in the browser, and the Tomcat interface will be displayed.

2.1.2 Modify Nginx Configuration

Modify the /etc/nginx/nginx.conf file:

1. listen: It indicates that the port 80 is monitored.
2. server_name: The access domain name is defined here.
3. proxy_pass: It is a proxy forwarding module. Its main function is to forward www.123.com requests to http://192.168.1.13:8080/.

Start the Nginx service:

Modify the hosts file in Windows:

Press Win + S, run Notepad as an administrator, open the hosts file under C:\Windows\System32\drivers\etc, and add the mapping.

Test:

Enter www.123.com in the browser, and you can access the Tomcat interface via Nginx.

2.2 Load Balancing

1. Setup Service 8080:

Rename the above-mentioned apache-tomcat to apache-tomcat8080, and create a test file:

2. Setup Service 8081:

Extract another Tomcat package and rename it as apache-tomcat8081. Modify its server.xml port settings:

Create the test page for 8081:

3. Modify Nginx for Load Balancing:

Add the upstream block to nginx.conf:

Result:

Restart the nginx service. When accessing www.123.com/test/test.html and opening multiple web pages, you will find that the page content alternates between the services on ports 8080 and 8081. This realizes load balancing.