How to install Redis on CentOS

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In this tutorial we will learn to install Redis on CentOS server.

What is Redis?

Redis is an open source (BSD licensed), in-memory data structure store, used as database, cache and message broker.
redis.io

Note! By default Redis will run on port number 6379

So, lets get started with the installation process. Open terminal and login to your server as root user.

Step 1: Clean up and update yum

Its a best practice to first clean up and update yum and then perform installation.

Clean up yum by typing the following in terminal.

# sudo yum clean all

Now perform the update

# sudo yum -y update

Once the update is done we are ready to install redis.

Step 2: Install Redis

Use the following command to install redis.

# yum install redis php-pecl-redis

Once redis is installed successfully you can check about it using the following command.

# redis-cli -v
redis-cli 2.8.19

Step 3: Start Redis

Now that you have installed redis its time to start it. For this use the following command.

# sudo systemctl start redis.service

Note!

To check the redis status using the following command

# sudo systemctl status redis.service
● redis.service - Redis persistent key-value database
   Loaded: loaded (/usr/lib/systemd/system/redis.service; disabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/redis.service.d
           └─limit.conf
   Active: active (running) since Sun 2016-02-14 10:55:14 UTC; 9s ago
 Main PID: 17531 (redis-server)
   CGroup: /system.slice/redis.service
           └─17531 /usr/bin/redis-server 127.0.0.1:6379

To stop redis use the following command

# sudo systemctl stop redis.service

Step 4: Checking Redis

Once the redis server starts running you can check that it is configured correctly by using the ping command in redis client. For this you have to enter into redis client by typing redis-cli in the terminal then type in ping. If everything is working fine the redis server will respond back PONG.

# redis-cli
127.0.0.1:6379> ping
PONG
127.0.0.1:6379>

To exit from redis-cli using the exit command.

Conclusion

Congratulation you have successfully installed redis. Have fun coding!

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