Install Redis on Ubuntu

Redis is an in-memory data structure store that may be used as a message broker, database, and cache on Ubuntu systems. Many data structures are supported, including strings, hashes, lists, sets, and more. Redis on Ubuntu offers real-time applications that need quick access to and manipulation of data a reliable, high-performance solution. It is renowned for its strength, simplicity, and support for replication, persistence, and high availability.

Install Redis on Ubuntu

To install Redis (Version 6.0.16) on Ubuntu, perform the following steps:

1.  Update your local package index to ensure you have the latest version of available packages.
   sudo apt update
   
   
2. Download Redis 6.0.16 using the below link.
   curl -O http://download.redis.io/releases/redis-6.0.16.tar.gz
   
   
3. Extract the downloaded tar file using the command.
   tar xzvf redis-6.0.16.tar.gz 
   
   
4.  After the "tar" file is extracted, use the below command to navigate to the downloaded tar file. 
   cd redis-6.0.16
   
   
5. Install the Redis server package from the official Ubuntu repositories.
   sudo apt install redis-server =6:6.0.16-1
   
   
6.  To edit the Redis configuration use the below command.
   sudo vi /etc/redis/redis.conf
   
   
7.  Scroll down and locate the supervised directive. By default, this is set to no. Set this directive to systemd. supervised systemd.
   Figure: General
   
   
8.  If any changes are made to the Redis configuration file, restart the Redis service to apply the changes.
   sudo systemctl restart redis
   
   
9.  To know the status of the Redis services use the below command.
   sudo systemctl status  redis
   Figure: Redis status

To enable the Redis server to start automatically upon system startup or a reboot.
sudo systemctl enable --now redis-server

To check the version of Redis installed.
redis-server -v
Figure: Redis version

Configure Authentication for Redis

1. To configure authentication for Redis use the below command.
   sudo vi /etc/redis/redis.conf
   
2. In the configuration file, locate and uncomment the requirepass directive. By default, this is set to foobared, which is a placeholder. Change this to a strong password. This is the password that clients will authenticate with using the AUTH command.
   Figure: Require pass
   
   
3.  Use the command to restart the Redis service.
   sudo systemctl restart redis.service

To test if password authentication works, invoke the Redis client.

Figure: Authentication

Allow Remote Connection

By default, Redis listens to port 6397 and is only accessible from localhost. However, you can configure it to allow remote connections from anywhere.
 
To allow remote connection to Redis, perform the below steps:

1.  Use the below command, to open the Redis configuration.
   sudo vi /etc/redis/redis.conf
   
   
2. Set the bind attribute to 0.0.0.0 to allow remote connections from anywhere and save the changes.
   Figure: Bind attribute
3. After the changes are made, use the below command to restart.
   sudo systemctl restart redis.service
   
   
4. To confirm that Redis can be accessed remotely, use the below command.
   sudo ss -an | grep 6379
   Figure: SS command
   
   
5. If the Firewall is enabled, use the below commands.
   sudo ufw allow 6379/tcp
   sudo ufw reload
   
   
6. To access the Redis server remotely, use the below commands.
   redis-cli -h  host-ip-address  -p port
   redis-cli -h 192.168.50.83 -p 6379

As a best practice, ensure the below keys are accommodated in redis.config file.
An example file with recommended initial settings is displayed below.
Figure: Recommended settings

To know more about the fields in the recommended settings page, refer to the table. 

Redis details are to be passed in Appsettings.production.JSON.