How to setup and run multiple Redis server instances on a Linux host

How to setup and run multiple Redis server instances on a Linux host

Environment

Redis

Linux

Purpose

Users can easily setup and run multiple Redis instances on the same Linux host. We have a Redis instance running on Ubuntu 14.04, and we want to setup a second Redis instance.

1. Existing Redis Server1 instance running on port 6379 using
/etc/redis/redis_6379.conf configuration file 
/etc/init.d/redis_6379 script
2. Create a new (2nd) Redis Server2 instance running on port 6380 using
/etc/redis/redis_6380.conf configuration file
/etc/init.d/redis_6380 script

Instructions

1) Setup a second Redis instance configuration file
cp /etc/redis/redis_6379.conf /etc/redis/redis_6380.conf
2) Change the following lines in /etc/redis/redis_6380.conf
pidfile /var/run/redis_6379.pid
port 6379
logfile /var/log/redis/redis_6379.log
dir /var/lib/redis/6379

To this:

pidfile /var/run/redis_6380.pid
port 6380
logfile /var/log/redis/redis_6380.log
dir /var/lib/redis/6380
3) Create a second Redis instance working directory
mkdir /var/lib/redis/6380
4) Change the following line in /etc/init.d/redis_6379
> EXEC=/usr/local/bin/redis-server        (no change here)
CLIEXEC=/usr/local/bin/redis-cli         (no change here)
PIDFILE=/var/run/redis_6379.pid
CONF="/etc/redis/6379.conf";
REDISPORT="6379"

To this:

NAME=`basename ${0}`
EXEC=/usr/local/bin/redis-server       (no change here)
CLIEXEC=/usr/local/bin/redis-cli        (no change here)
PIDFILE=/var/run/${NAME}.pid
CONF="/etc/redis/${NAME}.conf"
REDISPORT="${NAME#*_}"

ln -s /etc/init.d/redis_6379 /etc/init.d/redis_6380
6) Now we can start up and use both server instances
/etc/init.d/redis_6379 start
/etc/init.d/redis_6380 start
> redis-cli -p 6379 info server | egrep "process_id|tcp_port|config_file"
process_id:8329
tcp_port:6379
config_file:/etc/redis/redis_6379.conf

> redis-cli -p 6380 info server | egrep "process_id|tcp_port|config_file"
process_id:5809
tcp_port:6380
config_file:/etc/redis/redis_6380.conf
Written on January 8, 2018