run multiple redis instances on the same server for centos

run-multiple-redis-instances.md

• create a new redis .conf file

$ cp /etc/redis.conf /etc/redis-xxx.conf

• edit /etc/redis-xxx.conf, illustrated as below

...
#modify pidfile
#pidfile /var/run/redis/redis.pid
pidfile /var/run/redis/redis-xxx.pid

...
#dir /var/lib/redis/
dir /var/lib/redis-xxx/

...
#modify port
#port 6379
port 6380

...
#modify logfile
#logfile /var/log/redis/redis.log
logfile /var/log/redis/redis-xxx.log

...
#modify vm-swap-file
#vm-swap-file /tmp/redis.swap
vm-swap-file /tmp/redis-xxx.swap
...

• make dir /var/lib/redis-xxx

$ mkdir -p /var/lib/redis-xxx

• copy init script

$ cp /etc/init.d/redis /etc/init.d/redis-xxx

• edit the new init script

...

#pidfile="/var/run/redis/redis.pid"
pidfile="/var/run/redis/redis-xxx.pid"

...

#REDIS_CONFIG="/etc/redis.conf"
REDIS_CONFIG="/etc/redis-xxx.conf"

...

• query the status of this redis in

$ sudo service redis-xxx status
# server is stopped

# start service
$ sudo service redis-xxx start

• make redis-xxx service auto start

$ sudo chkconfig --level 3 redis-xxx on

You are also missing a command after creating the .conf file:
sudo chown redis /etc/redis-xxx.conf
or you will get a # Fatal error, can't open config file '/etc/redis-xxx.conf'