PHP load balanced demo

Demo of load balancing a PHP setup using redis to handle the PHP session. The purpose of this project is to play with a load balancer setup to serve a PHP application.

Containers

• 2 nginx nodes
• 2 php-fpm
• 1 nginx as load balancer
• 1 redis
• 1 mysql

About php-fpm

The docker/php8.0-nginx/Dockerfile installs the required modules, including the php-redis module.

The file docker/conf/php/php.ini configures PHP to handle session using redis, by pointing to the redis container.

Some ports

Accessible ports through localhost:

• redis-stack: 8003
• Load balancer: 8080

Structure

└── docker
   ├── conf
   │  ├── mysql
   │  └── initdb
   │  ├── nginx
   │  │   ├── node1
   │  │   └── node2
   │  └── php
   ├── php8.0-nginx
   └── volumes
       ├── app
       ├── backups
       ├── log
       │   ├── lb
       │   ├── node1-nginx
       │   └── node2-nginx
       ├── mysql-data
       ├── redis-data
       ├── www
       └── wwwdata

Known bugs

• Fallback to index.php is not working.

Running

After docker-compose up -d --build (on Windows you may use docker compose up -d --build) there will be 7 cotainers running. Browse to http://localhost:8080 . You should see a '1' on the page. Reload several times to increase to number shown.

Check the access nodeX-nginx access logs and half of the request must be shown on each file.

Also, http://localhost:8003 should show a PHPREDIS_SESSION containing the session data.

You can fire a second browser or an incognito tab to get another session.