So I've had the need of running 2 instances of redis in the same server. My server is an Ubuntu 14.04 box.
So I followed this guide, but not in a strict way. I mean, instead of modifying redis init scripts (that come from Ubuntu packages) I decided to create new scripts for the 2nd instance, and leave the original ones untouched for the first instance.
So then, what I did is:
1) Create new script for new instance (it will run in the 6380 port, instead of the default 6379 one):
sudo cp /etc/init.d/redis-server /etc/init.d/redis-server6380
2) Modify /etc/init.d/redis-server6380 to be a bit different. Instead of:
DAEMON=/usr/bin/redis-server
DAEMON_ARGS=/etc/redis/redis.conf
NAME=redis-server
DESC=redis-server
RUNDIR=/var/run/redis
PIDFILE=$RUNDIR/redis-server.pid
It would have:
NAME=`basename ${0}`
DAEMON=/usr/bin/redis-server
DAEMON_ARGS=/etc/redis/${NAME}.conf
DESC=${NAME}
RUNDIR=/var/run/redis
PIDFILE=$RUNDIR/${NAME}.pid
3) Then copy the configuration:
cp /etc/redis/redis-server.conf /etc/redis/redis-server6380.conf
Edit the new redis-server6380.conf file to be from:
pidfile /var/run/redis/redis-server.pid
port 6379
logfile /var/log/redis/redis-server.log
dir /var/lib/redis
To:
pidfile /var/run/redis/redis-server6380.pid
port 6380
logfile /var/log/redis/redis-server6380.log
dir /var/lib/redis6380
4) Then create the working directory:
sudo mkdir /var/lib/redis6380 && sudo chown redis.redis /var/lib/redis6380
The slight problem I have now, is that it's kind of difficult to check if the instances are runnning.
Before, I guess I could just run:
service redis-server status
And know whether redis is running.
Now, if I do that, I get:
$ service redis-server status
redis-server is not running
Even when the first instance is running! And for the 2nd instance I get:
$ service redis-server6380 status
redis-server6380 is start-stop-daemon: warning: this system is not able to track process
names longer than 15 characters, please use --exec instead of --name.
not running
BUT WHY? I don't understand...
Same thing happens if I use /etc/init.d/redis-server* instead of service. The hacky way I now know to check if they are really running is this:
$ ps aux | grep redis
andrew 365 0.0 0.1 10468 2236 pts/0 S+ 07:17 0:00 grep --color=auto redis
redis 22521 0.0 1.3 50860 23132 ? Ssl Feb19 4:38 /usr/bin/redis-server 0.0.0.0:6379
redis 52953 0.0 0.5 38572 8860 ? Ssl Feb25 0:23 /usr/bin/redis-server 0.0.0.0:6380
But I would like to not need to resort to this :(
