Redis is an open source, in memory key-value data store which can be used as a database, cache and as a message broker. Redis provides data redundancy and high availability via Redis Sentinel and automatic partitioning with Redis Cluster.
This article assumes that you have a 64 bit server with Centos 7.x installed. We will be taking a look on how to install redis.
As redis is not available by default in Centos, we will be installing redis via the corresponding EPEL repository.
$rpm -ivh epel-release-7-9.noarch.rpm
If wget is not installed, install the package by running
$yum install wget
Update the packages in the system by running
$yum update -y
After the update has completed, redis can be installed by running the below command:
$yum install redis -y
Start the redis service using the following command:
$systemctl start redis.service
The status of the redis service can be checked via running:
$systemctl status redis.service redis.service - Redis persistent key-value database Loaded: loaded (/usr/lib/systemd/system/redis.service; disabled) Drop-In: /etc/systemd/system/redis.service.d └─limit.conf Active: active (running) since Wed 2017-03-25 07:34:48 PST; 4s ago Main PID: 18868 (redis-server) CGroup: /system.slice/redis.service └─18868 /usr/bin/redis-server 127.0.0.1:6379
6379 is the default port number that redis service listens to.
We should get a
PONG reply when issuing the below command:
We now have a redis server up and running with the default configuration.
Auto start of redis service after server reboots can be configured with the below command:
systemctl enable redis.service
With this installation, redis can be accessed only via the localhost (server itself). For redis to be accessed from the internet comment the below line in /etc/redis.conf:
We will be learning about securing our redis installation in another article. We have a redis server up and running and its now time to save memory space in your application server by storing session and page cache in your redis server!!