Install Redis 6 on CentOS 7 to improve the performance of Cache objects, the content generated by PHP and the database.
Before going into the installation article, let’s learn about Redis 6.
This version of Redis 6 can be divided into several different categories such as security, performance, ease of use and even some completely new functions such as:
- Client side caching
- Threaded I/O
- Cluster support in Redis-benchmark and improved redis-cli cluster
- Supports multiple redis modules
- Redis Cluster Proxy
- RDB deletes itself when no longer in use
- Psync2 optimized replication protocol
- Support timeout setting
- RDB loading is 20-30% faster
See more about Redis 6 here and redislabs.com
II. Steps to install Redis 6 on CentOS 7
Step 1: SSH into the Linux server
To install Redis 6.2 on a CentOS 7 server, you need to SSH into the server. If you don’t know how to SSH, please refer to the following article:
Because the installation steps will take a long time, so to be safe, you should create a screen and run it on a backup screen when suddenly shutting down or losing an internet connection.
Step 2: Update the system
First, update the system with the following command:
yum update -y yum install gcc make wget tcl
Step 3: Install Redis 6 on CentOS 7
To install, you need to download redis source from the homepage and extract the installation.
cd /usr/local/src wget https://github.com/redis/redis/archive/6.2-rc2.tar.gz tar xf 6.2-rc2.tar.gz cd redis-6.2-rc2
After you have extracted and moved into the directory, start compiling with the
The build may take some time, depending on your server resources. Once completed, you will receive a message as follows:
Now run the
make test command to make sure the build is correct.
Next, install Redis binaries with the make install command:
Step 4: Create Redis User
groupadd redis adduser --system -g redis --no-create-home redis
Create a directory to store the database for redis.
mkdir -p /var/lib/redis chown redis: /var/lib/redis chmod 770 /var/lib/redis
Step 5: Create a Redis configuration file
After installing Redis, you need to configure Redis.
mkdir /etc/redis cp /usr/local/src/redis-6.2-rc2/redis.conf /etc/redis/
Then you find the
supervised line and change it to
supervised systemd as shown below:
Step 6: Create the Redis system file
Now that Redis is installed and configured, the final step is to create a systemd unit file so you can manage Redis services like a regular systemd service.
[Unit] [Unit] Description=Redis Data Store After=network.target [Service] User=redis Group=redis ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf ExecStop=/usr/local/bin/redis-cli shutdown Restart=always [Install] WantedBy=multi-user.target
#Kích hoạt cùng hệ thống systemctl enable redis #Khởi động Redis systemctl start redis #Kiểm tra trạng thái systemctl status redis
To verify Redis is up and running, run the following command:
[root@template redis-6.2-rc2]# redis-cli PING Output: PONG [root@template redis-6.2-rc2]# [root@template ~]# redis-cli monitor OK
Step 7: Check the Redis version
To check the Redis version, use the command
redis-server --version in the Terminal window.
As the picture below, I tested on 2 servers. One server uses
Redis server v=3.2.12 and the other server uses
Redis server v=6.1.241
III. Install Redis PHP Extension
Step 1: Install Redis PHP Extension
To connect the communication between the Redis server and the website, you need to install the Redis PHP Extension. If you do not install the Extension, you can still connect through
Predis. To install, you do it quickly with the following command:
yum install php-pear php-devel yum install php-redis -y
Step 2: Configure Redis as Cache Server
Please find and edit the following:
maxmemory 256mb maxmemory-policy allkeys-lru
Step 3: Install Redis cache on WordPress
After installing Redis, you can configure Redis on your website to work. Each source code will have a different configuration. In this article, I will guide you to configure it on WordPress using the Redis developer’s dedicated plugin.
I will use the Redis Object Cache Plugin to configure it.
Before installing, open
wp-config.php file and add the following code to authenticate the key:
define('WP_CACHE_KEY_SALT', 'string'); define('WP_CACHE', true);
Next, install the Redis Object Cache plugin. It installs a PHP script that helps WordPress communicate with Redis
After installing the plugin, you need to enable it by navigating to Cài đặt => Redis => click “Enable Object Cache” and the Status show “Connected”. If not, ensure you have added the configuration to the
wp-config.php file as above.
IV. Redis comparison table
I will use the available redis-benchmark tool to measure between Redis 6 and Redis 3 with the following criteria.
First, I will ping online to check the latency. Here frame 1 is Redis 6 and frame 2 is Redis you will see send 100000 requests and complete them in 4.26s and 3.25s, but in terms of latency (time out), Redis 6 lower than Redis 3.
See more comparisons at the following link:
So AZDIGI has completed the guide to install Redis 6 on CentOS 7. Hope this article will be helpful to you and can help you set up to improve the performance of your server and website.
If you need assistance, you can contact support in the ways below: