Let’s learn the steps to install the Redis database server on Ubuntu 22.04 LTS Jammy JellyFish using the command terminal.
Redis is a “Key-Value Store” (or KV Store for short) Database. Here, the data is always stored in the form of key-value pairs. So you can think of the database in such a way that there is only one table with two columns, namely one column for the key and one for the value. However, since Redis knows different data types for the values, the developers prefer to refer to the database as a “data structure store”.
Compared to other databases such as MySQL, PostgreSQL, or CouchDB, Redis is extremely fast. Even on reasonably up-to-date desktop computers, the database manages over 100,000 (simple) writes and over 80,000 (simple) reads per second. This is primarily because the database is kept completely in RAM and is only written to the hard disk after a certain time or a certain number of changed values. Furthermore, Redis masters replication and is also cluster-capable since version 3.0.
Redis is designed as a server-client architecture, i.e. the Redis server runs as a service (in the background) and can then be queried by the client. Furthermore, the Redis installation also includes a command line, which can be used to use the full range of functions of the server.
It is also important that with Redis keys are “everything” and values are “nothing”. This means that all queries always refer to a key and return a value.
Steps to install Redis on Ubuntu 22.04 LTS Linux
This guide can be used for other versions of Ubuntu Linux such as 20.04 including other similar OS let’s say Debian, Linux Mint, POP_OS, and more…
1. Refresh the APT package Index
Perform the system update command that will refresh the APT package manager package index cache as well as install the latest available security updates.
sudo apt update && sudo apt upgrade
2. Install Redis on Ubuntu 22.04
Redis is an open-source database server that is available to install using the default system repository of Ubuntu. Hence, we don’t need to add any third-party repository.
sudo apt install redis-server
To check the installed version, use:
redis-server -v
3. Check the service status
After the installation let’s check whether the Redis-server service is running in the background without any error.
sudo systemctl restart redis
For status:
sudo systemctl status redis
4. Use Redis-CLI to confirm server connection
To confirm our system can connect to the Redis server, we can use a command-line utility called – redis-tool that can be used to send commands to Redis… Redis instance running on localhost at port 6379. Here are the commands to follow:
redis-cli
After that type:
ping
This will reply with – PONG
5. Test Redis on Ubuntu 22.04
We can also use the Redis-CLI tool to set and retrieve values, to check how it works, let’s add a key and a value for it. After that use the key to retrieve the value as we know this database is an in-memory key-value NoSQL database.
redis-cli
Let’s say we have a key called “key1” and “My First Key” is the value we are setting for it.
set key1 "My Fist Key"
Get key value:
get key1
To exit:
quit
Know more about Altering and querying the keyspace on the official doc page.
6. Set password for Redis
By default, there will be no authentication when you send commands to the server using the redis-tool. To add an extra layer of security we can assign a password. For that edit the configuration file.
sudo nano /etc/redis/redis.conf
Find line:
requirepass fooboard
uncomment it by removing the # symbol. After that change “fooboard” with whatever password you want to set for Redis-tool.
Save the file by pressing Ctrl+O; hit the Enter key, and then exit the file using – Ctrl+X.
Restart the Redis service
sudo systemctl restart redis
Now, let’s check whether the Redis tool is asking for a password to send commands or not.
redis-cli
Let’s send the command “ping”
You will have an error:
(error) NOAUTH Authentication required.
This means we need to supply the password. For that type:
auth your-password
After that enter the Redis command you want to use.
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