How to install Redis on Amazon Linux or CentOS

In this tutorial, we’ll explain how to install Redis on Amazon Linux or CentOS.

Redis is open-source, it stores data structure in-memory, which is also used as a database/cache. It supports data structures such as strings, hashes, lists, sets, sorted sets with range queries, bitmaps, geospatial indexes with radius queries and streams.

How to install Redis on Amazon Linux or CentOS

To know more check out Redis: 

In this blog, we will see how to install Redis on Amazon Linux or CentOS, follow the below steps to install Redis v3.2  using YUM.

Step 1: Enable EPEL repository:

Enable EPEL (Extra Packages for Enterprise Linux) repository on the server.

$ wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm
$ rpm -ivh epel-release-latest-6.noarch.rpm

[OR]

Create repo file in "/etc/yum.repos.d/"

$ vi /etc/yum.repos.d/epel.repo
[epel]
name=Extra Packages for Enterprise Linux 6 - $basearch
baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch
mirrorlist=https://mirrors.fedoraproject.org/metalink?repo=epel-6&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6

Step 2: Clean all yum repo and update the repo list:

$ yum clean all
$ yum repolist

Step 3: Install Redis on the server by running a command

$ yum install redis 

Step 4: Check Redis status

$ service redis status

Commands to Start/Stop/Restart Redis service on Amazon Linux or CentOS

$ service redis start
$ service redis stop
$ service redis restart

How to test Redis in Linux?

Before testing check Redis server is working, if not start the Redis service

$ service redis start

Test Redis Installation: Command to check Redis is properly installed and working normally if the response is PONG from below command.

$ redis-cli ping

Step 6: Redis server configuration file.

Redis server listens on port 6379 you can update configuration in file “/etc/redis.conf”

Eg: Command to check Redis server listing on which port – herein below output Redis is listening on 6379 port

$ ps aux | grep redis
redis 25080 0.0 0.0 142936 3716 ? Ssl 09:13 0:00 /usr/bin/redis-server 127.0.0.1:6379
root 25548 0.0 0.0 110460 2104 pts/0 S+ 09:36 0:00 grep --color=auto redis

Step 7: Autostart Redis service on next boot

$ chkconfig redis on

Some Basic Troubleshooting while Installing Redis:

[root@Sks-linux ~]# cat /var/log/redis/redis.log
21197:C 13 Nov 12:10:14.557 # Can't chdir to '/var/lib/redis': Permission denied
Solution:
chmod o+x /var/lib/

[root@sks-linux log]# service redis start
Starting Redis-server:
*** FATAL CONFIG FILE ERROR ***
Reading the configuration file, at line 163
>>> 'logfile /var/log/redis/redis.log'
Can't open the log file: Permission denied
                                                           [FAILED]
[root@Sks-linux log]# 

Follow the below command to fix this issue:

$ chmod o+x /var/log/
$ chmod o+x /var
$ chmod o+x /var/run/
$ chown -R redis:redis /var/log/redis/

This is the end of the tutorial where you learn how to install Redis on Amazon Linux or CentOS.

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