How to Download and Install Redis on Ubuntu 20.04
Redis is an open-source, in-memory data structure store that can serve as a database, cache, or message broker. It supports various data types, such as strings, lists, sets, hashes, bitmaps, and streams. Redis is known for its high performance, scalability, and flexibility.
In this tutorial, you will learn how to download and install Redis on Ubuntu 20.04 from the official repository. You will also learn how to configure Redis as a systemd service, secure it with authentication and firewall, enable persistence options, and optimize its performance and memory usage.
download redis ubuntu 20.04
Introduction
Before you begin, you will need the following:
An Ubuntu 20.04 server with a non-root user with sudo privileges and a firewall configured with ufw. You can follow our to set this up.
A terminal window or SSH access to your server.
Basic knowledge of Linux commands and text editors.
Installing Redis from the Official Repository
The easiest way to install Redis on Ubuntu 20.04 is to use the official packages.redis.io APT repository, which provides the latest stable version of Redis. As of this writing, the latest version is Redis 6.0.9.
To install Redis from the official repository, follow these steps:
Add the repository to your system by running the following commands:
sudo apt update sudo apt install apt-transport-https ca-certificates curl gnupg lsb-release curl sudo apt-key add - echo "deb focal main" sudo tee /etc/apt/sources.list.d/redis.list
Update your package cache again and install Redis using apt:
sudo apt update sudo apt install redis
Verify that Redis is installed and check its version by running:
redis-server --version
You should see output similar to this:
Redis server v=6.0.9 sha=00000000:0 malloc=jemalloc-5.1.0 bits=64 build=3c12b0e288f82f41
Configuring Redis as a Systemd Service
By default, Redis runs as a daemon (background process) that can be controlled by systemd, the init system used by Ubuntu. This allows you to easily start, stop, restart, or check the status of Redis with simple commands. You can also enable Redis to start automatically on system boot.
To configure Redis as a systemd service, follow these steps:
Edit the Redis configuration file located at /etc/redis/redis.conf using your preferred text editor. For example, you can use nano:
sudo nano /etc/redis/redis.conf
Find the line that says # supervised no and change it to supervised systemd. This will instruct Redis to use systemd as the supervisor. Save and close the file.
Restart Redis to apply the changes by running:
sudo systemctl restart redis
Check the status of Redis by running:
sudo systemctl status redis
You should see output similar to this:
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redis.service - Advanced key-value store Loaded: loaded (/lib/systemd/system/redis.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2021-06-21 12:10:00 UTC; 5min ago Docs: man:redis-server(1) Main PID: 1234 (redis-server) Tasks: 4 (limit: 2283) Memory: 6.3M CGroup: /system.slice/redis.service 1234 /usr/bin/redis-server 127.0.0.1:6379
If you see active (running) in the output, it means that Redis is running successfully.
Test Redis functionality by using the redis-cli command-line tool. Connect to the Redis server by running:
redis-cli
You should see a prompt like this:
127.0.0.1:6379>
Try some basic commands, such as ping, set, get, and del. For example:
127.0.0.1:6379> ping PONG 127.0.0.1:6379> set hello world OK 127.0.0.1:6379> get hello "world" 127.0.0.1:6379> del hello (integer) 1 127.0.0.1:6379> exit
If you see the expected outputs, it means that Redis is working properly.
Securing Redis with Authentication and Firewall
By default, Redis does not require any authentication to access its data and commands. This means that anyone who can connect to the Redis port can execute arbitrary commands and potentially compromise your data or system. To prevent unauthorized access, you should secure Redis with a password and a firewall.
To secure Redis with authentication and firewall, follow these steps:
Edit the Redis configuration file again and find the line that says # requirepass foobared. Uncomment this line and change foobared to a strong and secure password of your choice. Save and close the file.
Restart Redis to apply the changes by running:
sudo systemctl restart redis
Configure ufw to allow only local connections to Redis by running:
sudo ufw allow from 127.0.0.1 to any port 6379 sudo ufw reload
Test the security settings by using redis-cli again. Connect to the Redis server by running:
redis-cli
Try to execute any command, such as ping, without providing the password. You should see an error message like this:
127.0.0.1:6379> ping (error) NOAUTH Authentication required.
To authenticate, use the auth command followed by your password. For example:
127.0.0.1:6379> auth your_password OK 127.0.0.1:6379> ping PONG 44f88ac181
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