Using Managed Service for Redis clusters as PHP session storage
You can use Managed Service for Redis clusters for storing PHP session data.
To configure a Managed Service for Redis cluster as PHP session storage:
- Configure PHP to use the Managed Service for Redis cluster as storage for sessions.
- Check whether PHP session data is saved to the Managed Service for Redis cluster.
If you no longer need the resources you created, delete them.
Getting started
Prepare the infrastructure
-
Create a virtual machine with LAMP/LEMP in Compute Cloud of any suitable configuration.
-
Create a Managed Service for Redis cluster with any suitable configuration.
Configure additional settings
-
Connect to the VM with the web server via SSH and configure it:
-
Install certificates:
sudo mkdir --parents /usr/local/share/ca-certificates/NebiusAI/ && \ sudo wget "https://storage.nemax.nebius.cloud/certs/CA.pem" \ --output-document /usr/local/share/ca-certificates/NebiusAI/NebiusAICA.crt
-
Prepare the environment and install the phpredis
library usingpecl
:sudo apt update && \ sudo apt install php-dev pkg-php-tools redis-tools --yes && \ sudo pecl channel-update pecl.php.net && \ sudo pecl install redis
-
Become the owner of the
/var/www/html/
directory and delete all its contents:sudo chown <username> /var/www/html/ --recursive && \ rm /var/www/html/*
-
Configure PHP to use the Managed Service for Redis cluster as storage for sessions
-
Make changes to the
php.ini
configuration file for your web server.The
php.ini
file is usually located in the following directory:/etc/php/7.2/apache2/
for Apache./etc/php/7.2/fpm/
for NGINX.
To find out the location of
php.ini
, run the commandsudo find /etc/ -name php.ini
.Note
There is no need to make any changes to
php.ini
for the PHP CLI.[PHP] ... extension = redis ... [Session] session.save_handler = redis session.save_path = "tcp://<FQDN of Redis master host>:6379?auth=<password>"
For more information about how to connect to clusters, see Preparing for connecting.
-
Restart the web server:
sudo systemctl restart apache2
for Apache.sudo systemctl restart php7.2-fpm
for NGINX.
Check whether PHP session data is saved to the Managed Service for Redis cluster
-
In the
/var/www/html/
directory, create a fileindex.php
that will output powers of2
:<?php session_start(); $count = isset($_SESSION['count']) ? $_SESSION['count'] : 1; echo $count; $_SESSION['count'] = $count * 2;
Each time the page is refreshed, the output value will increase. The
$count
variable value will be saved in the session data. A unique key will be created for each session in Redis. -
Connect to the Redis cluster from the VM via
redis-cli
:redis-cli -c -h <FQDN of master host> -a <password>
Enter the following command to see what keys are stored in Redis:
KEYS *
(empty list or set)
The returned result shows that no data is currently stored in Redis.
-
Check whether user sessions are saved when connecting to the web server:
- Enter the public IP of the VM hosting the web server in the browser address bar. The first time you open the page,
1
is output. - Refresh the page several times: the output value will increase.
- Open the page from a different browser: the count will start with
1
. - Refresh the page several times: the output value will increase, too.
The fact that the value of the
$count
variable is saved between browser page updates shows that the configured PHP session storage mechanism in the Managed Service for Redis cluster works properly. - Enter the public IP of the VM hosting the web server in the browser address bar. The first time you open the page,
-
Repeat the query to view the keys stored in Redis:
KEYS *
1) "PHPREDIS_SESSION:keb02haicgi0ijeju3ngqqnucq" 2) "PHPREDIS_SESSION:c5r0mbe1v84pn2b5kj1umun1sp"
The returned result shows that, for each session in Redis, its own key is created.
Delete the resources you created
Delete the resources you no longer need to avoid being charged for them: