How To Install Redis On CentOS 8

How to install Redis on CentOS 8

Install Redis on CentOS 8

Redis is an in-memory key-value data structure store used primarily as a database, message broker, or cache. Redis supports a wide range of languages with flexibility and high performance. It supports various data structures, such as strings, lists, sets, maps, spatial indexes, and bitmaps. In this tutorial, you will learn how to install Redis on CentOS 8.

Prerequisites

Before you start installing Redis on CentOS 8, you need a non-root user account on the server with sudo privileges and enable IPv6 on the server. Otherwise, the Redis service will not start.

Install Redis

Update the dnf package manager index by entering the following command:

                      sudo dnf update

To install Redis, execute the following command.

                      sudo dnf install redis

After installing Redis, the Redis service is not started automatically, so execute the following command to start the redis service.

                      sudo systemctl start redis

Then, enable the Redis service so that it will start automatically when you run the following command after startup.

                      sudo systemctl enable redis

Execute the following command to check the status of the Redis service.

                      sudo systemctl status redis-server

The output looks like this:

                      ● redis.service - Redis persistent key-value database
Loaded: loaded (/usr/lib/systemd/system/redis.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/redis.service.d
        └─limit.conf
Active: active (running) since Sat 2019-12-21 15:12:03 PST; 39s ago
Main PID: 2157 (redis-server)
CGroup: /system.slice/redis.service
        └─2157 /usr/bin/redis-server 127.0.0.1:6379

Redis Binding

By default, Redis is not accessible from another host because it is bound by default localhost only. To check the binding to localhost (127.0.0.1), follow these steps:

First, execute the following command to open the Redis configuration file.

                      sudo nano /etc/redis.conf

Uncomment now bind 127.0.0.1 Line by removing # From the beginning. Currently bound only to localhost.

                      bind 127.0.0.1

If you access Redis from a remote host, you can replace it YOUR_IP_ADDRESS Server IP address:

                      bind 127.0.0.1 YOUR_IP_ADDRESS

Save and close CTRL+x .

For the changes to take effect, restart the Redis server by running the following command:

                      sudo systemctl restart redis-server

Run the following command to confirm the above changes:

                      tcp        0      0 127.0.0.1:6379          0.0.0.0:*               LISTEN      14222/redis-server  
tcp6       0      0 153.168.93.106:6379           *:*               LISTEN      14222/redis-server

Next, set up FirewallD to access Redis from a remote host.

Create the zone name redis using the following command.

                      sudo firewall-cmd --new-zone=redis --permanent

Use the following command to permanently open port 6379:

                      sudo firewall-cmd --zone=redis --add-port=6379/tcp --permanent

Replace and run the following command YOUR_CLIENT_IP_ADDRESS The IP address of the machine accessing Redis:

                      sudo firewall-cmd --zone=redis --add-source=YOUR_CLIENT_IP_ADDRESS --permanent

Finally, reload FirewallD to see the effect of the change.

                      sudo firewall-cmd --reload

Now start to make sure everything is fine redis-cli Use the following command:

                      redis-cli

The above command is started redis-cli shell. So, to make sure everything works, run the following command:

                      ping

The following output is displayed exactly:

                      PONG

Exit the redis-cli shell using the following command.

                      exit

Test using redis-client

To start testing Redis, run redis-cli Use the following command:

                      redis-cli

redis-cli shell opens and saves value with key myname Worthwhile John Execute the following command internally:

                      set myname "John"

The output looks like this:

OK

Execute the following command to check the value of myname :

                      get myname

The following output is displayed.

                      John

Ends redis-cli Shell using the following command:

                      exit

Conclusion

You have learned how to install Redis on CentOS 8. If you have any questions, don’t forget to comment them out.