Redis is an open-source (BSD licensed), in-memory key-value data structure store used as a database, cache, and message broker. Redis supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyper log logs, geospatial indexes, and streams. Redis also provides high availability with Redis Sentinel software logic, creating automatic partitioning across Redis nodes with Redis Cluster.
In the following tutorial, you will learn how to install Redis on Fedora 36 Linux workstation or server using the terminal command line and some basic setup instructions to get you started using the command line terminal.
Table of Contents
Before installing Redis, start by making sure your packages on your system are up-to-date to avoid any conflicts during the installation using the following command.
sudo dnf upgrade --refresh
The Fedora repository, by default, contains the latest version of Redis, making the installation straightforward.
Use the following command to install.
sudo dnf install redis -y
Next, verify the status and make sure Redis is running and, more importantly, with no errors.
systemctl status redis
Note that Reddis actively listens to localhost on the default port 6379. To confirm this type, the following:
ps -ef | grep redis
While testing, everything is working and operational, connecting to your Redis service is good, and then performing a ping test.
To perform the test, enter the following command:
Once connected, your terminal will display (127.0.0.1:6379). Now ping the Redis service as follows:
Type the following to exit the Redis instance:
Congratulations, you have installed Redis on your Fedora 36 workstation or server and verified it is operational.
Next, you can configure Redis.
How to Configure Redis
Redis can be configured in a few ways. The most notable action of why people use Redis is for caching purposes. To do this, you need to open the “/etc/redis/redis.conf” file using nano editor.
sudo nano /etc/redis.conf
Configure Max Memory
Now, add the following to the end of the file. Note that you can change the memory value to whatever you like or, more importantly, optimal for your web application and server hardware.
maxmemory 500mb maxmemory-policy allkeys-lru
As you can see, the setting in the guide has 500MB dedicated to Redis as it is on a dedicated host with lots of RAM to spare. Once the 500MB is exhausted, Redis removes any key as per the LRU algorithm.
Configure Network Access
Another option is to listen to all services or set an IP address/subnet if you like your Redis service.
First, find line 69 in the configuration file.
First, to listen to all network interfaces, Comment “#” the line bind to IP.
# bind 127.0.0.1 ::1
Note, make sure your internal network is trustworthy and has appropriate security controls.
To bind to an IP address, make sure it is a static IP address.
To bind a network subnet.
Note, it is highly suggested to set a password when using subnet or access to all interfaces to listen to.
Another security feature to further harden Redis is to set a password on the Redis instance.
Navigate to line 507, uncomment the “# requiredpass” line, and set a password.
Make sure this password is robust, numbers, letters, special symbols, and capitals randomized as Redis servers can be bruted forced on a decent box.
Next, when invoking the Redis-CLI, use the following command with the password that was set for the user.
“THEPASSWORDSET” is the password that was created.
When users fail to log in, they will see the following error message.
(error) NOAUTH Authentication required.
When a user successfully logs in, they will see the following message.
Once done, save your changes CTRL+O then exit CTRL+X. Now restart the Redis service by typing:
sudo systemctl restart redis-server
Configure Firewalld for Redis
By default, no rules are set up for Redis. This means you will need to create allow rules which is essential to stop attacks on Redis, failure to secure Redis will lead to issues down the track, so do not skip this unless you have other means to protect your Redis installation.
First, add a new dedicated zone for Redis firewalld policy.
sudo firewall-cmd --permanent --new-zone=redis
Next, specify the allowed IP addresses permitted to access the Redis.
sudo firewall-cmd --permanent --zone=redis --add-source=18.104.22.168
Replace 22.214.171.124 with the IP address that will be added to the allow list.
Once you have finished adding the IP addresses, open the port of the Redis. By default, this is TCP port 6379.
sudo firewall-cmd --permanent --zone=redis --add-port=6379/tcp
Note that you can change the default port in your configuration file if you change the firewall port open rule above to the new value.
After running those commands, reload the firewall to implement the new rules.
sudo firewall-cmd --reload
Example output if successful:
Now, as you tested at the start of the guide by pinging your Redis service to make sure it was operational, you can try the firewall rules and changes in IP by using the “redis-cli” command.
redis-cli -h <ip address> ping
If setup correctly, the output should be:
How to Remove (Uninstall) Redis
When you need to remove Redis, use the following command.
sudo dnf remove redis
Comments and Conclusion
In the guide, you have learned how to install Redis on Fedora 36 Linux by using its default repositories through the DNF package manager. You have learned how to test the service by pinging it and changing the memory limit and network interface to suit various setups.
To find more information about managing your Redis installation, visit the Redis documentation page.