How To Install Redis On Ubuntu
In this article , We have explained how to Install Redis on Ubuntu.
We have also published article which covers Installation and Configuration of Database engines on Ubuntu operating systems.Check it out.
Install MySQL & Configure on Ubuntu
Okay , Lets get started with the installation of Redis on Ubuntu operating system.
What Is Redis?
Redis is an open source , in-memory data structure store, used as a database, cache and message broker.
It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, hyperloglogs, geospatial indexes with radius queries and streams.
In addition to being fully in-memory, Redis enables data persistence and high availability through replication and backups.
Prerequisites
Make sure you have root or sudo privileges on the system where you want to install redis.
Redis packages comes with the default Ubuntu software repository , In order to install the latest version redis ,
Update the Ubuntu APT package software repository to the latest available versions using the below command.
sudo apt-get update
Lets go ahead and install Redis.
Installing Redis On Ubuntu
As the redis packages are available on the default apt repository , Run the below command to install the redis packages which will install all of its dependencies.
sudo apt-get install redis-server
During installation If you face the below the error as shown below.
Errors were encountered while processing:
redis-server
Due to the above error , The redis-server packages will be installed but it will fail to start the service.
To fix this issue , Go to /etc/redis folder and then open redis.conf file
We need to alter redis.conf to force it to use IPv4 only.
sudo nano /etc/redis/redis.conf
Search for bind and then remove ::1 IPv6 loopback address from the bind option.
Save and close the file.
Now if you re-run the below command , You shouldn’t be facing any issue.
sudo apt-get install redis-server
By default , While installing redis It will automatically configure systemd service file for us to easily manage the redis service.
You can find the redis.service file under /etc/systemd/system/ folder.
cat /etc/systemd/system/redis.service
To check the status of redis service , You can any one of the below commands
sudo systemctl status redis
sudo systemctl status redis-server.service
sudo systemctl status redis.service
You will get the below response.
To enable the redis service to automatically start on system boot up , use the below command.
sudo systemctl enable redis-server.service
Using the below command , You can restart the redis service.
sudo systemctl restart redis-server
To check the version of Redis installed on the ubuntu system.
sudo redis-server --version
sudo redis-cli --version
By default , Redis will be running on localhost and listening on port 6379.
Using the below command , You can check the same.
sudo netstat -nltp |grep redis
To allow connections from the remote hosts , We need to edit redis.conf file and configure as shown below.
sudo vi /etc/redis/redis.conf
Replace bind 127.0.0.1 to 0.0.0.0 , Save and close the file.
For the changes the take effect , We need to restart the redis service.
sudo systemctl restart redis-server
Now If you run the below command , You can see that redis will accept connections from any host.
sudo netstat -nltp |grep redis
Connecting Redis
We use redis-cli , the Redis command line interface , using which we can send command to the redis server and we can read the replies sent by the server from the terminal.
Run the below command to test the connectivity with the Redis server.
redis-cli
And run ping to test the connectivity from the redis shell.You should get a response as PONG.
From this , We can confirm that the redis server is working as expected.
The more useful redis-cli command.
From the redis shell , run info to get the overall status of the redis server.
127.0.0.1:6379> info
You can check the details such as Number of clients connected with the redis server , Replication status , Memory & CPU used , Cluster status and much more.
To exit from the redis-cli shell , Execute the command.
127.0.0.1:6379> exit
Running Redis On Custom Port
As we know that Redis by default runs on the port 6379.For security reasons , If you wish to run redis server on different port.
Open the redis.conf file.
sudo nano /etc/redis/redis.conf
and change the port number.
After changing the port , Save and close the file and restart the redis service for the changes to take effect.
Now If you run the below command , You can see that the redis server is running on the port that you have configured.
sudo netstat -nltp |grep redis
Removing Redis From Ubuntu
If you wish to remove redis from the ubuntu operating system after testing , You can run the below command.
sudo apt-get purge redis-* -y
This will remove all the files and folders used by the redis server.
We have successfully installed and configured Redis on Ubuntu.
That’s all for this tutorial.Thanks for reading.
Hope you find it helpful.