Setting up multiple Redis instances on the same server is pretty easy, but if you want to be able to easily start\/stop and restart instances, you’ll need to play with the init scripts of redis-server.<\/p>\n
I needed this to be able to offer Redis buckets to different customers on a shared platform.<\/p>\n
This is how I managed to set up multiple instances on the same server.
\nSince installing redis-server is out of the scope of this article, I’ll only explain what I did to manage multiple Redis Servers.<\/p>\n
* Setting up a new INIT script:<\/p>\n
cd \/etc\/init.d\r\nmv redis-server ~\/redis-server.bak\r\ntouch redis-server\r\nchmod 755 redis-server\r\nvim redis-server<\/pre>\n* Paste this into the new redis-server init script:<\/p>\n
#!\/bin\/sh\r\n### BEGIN INIT INFO\r\n# Provides: redis-server\r\n# Required-Start: $syslog $remote_fs\r\n# Required-Stop: $syslog $remote_fs\r\n# Should-Start: $local_fs\r\n# Should-Stop: $local_fs\r\n# Default-Start: 2 3 4 5\r\n# Default-Stop: 0 1 6\r\n# Short-Description: redis-server - Persistent key-value db\r\n# Description: redis-server - Persistent key-value db\r\n### END INIT INFO\r\n\r\nif [ \"$#\" -eq 2 ]\r\nthen\r\nNAME=$2\r\n\r\nPATH=\/usr\/local\/sbin:\/usr\/local\/bin:\/sbin:\/bin:\/usr\/sbin:\/usr\/bin\r\nDAEMON=\/usr\/bin\/redis-server\r\nDAEMON_ARGS=\/etc\/redis\/servers\/$NAME.conf\r\nDESC=redis-server\r\n\r\nRUNDIR=\/var\/run\/redis\r\nPIDFILE=$RUNDIR\/$NAME.pid\r\n\r\necho \"Managing Redis server with the following attributes:\"\r\necho \" Daemon Args: $DAEMON_ARGS\"\r\necho \" Pidfile: $PIDFILE\"\r\n\r\ntest -x $DAEMON || exit 0\r\n\r\n#if [ -r \/etc\/default\/$NAME ]\r\n#then\r\n# . \/etc\/default\/$NAME\r\n#fi\r\n\r\n. \/lib\/lsb\/init-functions\r\n\r\nset -e\r\n\r\ncase \"$1\" in\r\n start)\r\n echo -n \"Starting $DESC: \"\r\n mkdir -p $RUNDIR\r\n touch $PIDFILE\r\n chown redis:redis $RUNDIR $PIDFILE\r\n chmod 755 $RUNDIR\r\n\r\n if [ -n \"$ULIMIT\" ]\r\n then\r\n ulimit -n $ULIMIT\r\n fi\r\n\r\n if start-stop-daemon --start --quiet --umask 007 --pidfile $PIDFILE --chuid redis:redis --exec $DAEMON -- $DAEMON_ARGS\r\n then\r\n echo \"$NAME.\"\r\n else\r\n echo \"failed\"\r\n fi\r\n ;;\r\n stop)\r\n echo -n \"Stopping $DESC: \"\r\n if start-stop-daemon --stop --retry forever\/QUIT\/1 --oknodo --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_ARGS\r\n then\r\n echo \"$NAME.\"\r\n else\r\n echo \"failed\"\r\n fi\r\n rm -f $PIDFILE\r\n sleep 1\r\n ;;\r\n\r\n restart|force-reload)\r\n ${0} stop $2\r\n ${0} start $2\r\n ;;\r\n\r\n status)\r\n echo -n \"$DESC is \"\r\n if start-stop-daemon --stop --quiet --signal 0 --name ${NAME} --pidfile ${PIDFILE}\r\n then\r\n echo \"running\"\r\n else\r\n echo \"not running\"\r\n exit 1\r\n fi\r\n ;;\r\n\r\n *)\r\n echo \"Usage: \/etc\/init.d\/redis-server\/$NAME {start|stop|restart|force-reload|status}\" >&2\r\n exit 1\r\n ;;\r\nesac\r\n\r\nelse\r\nFILES=\/etc\/redis\/servers\/*\r\nfor f in $FILES\r\ndo\r\n echo $f\r\n SERVERNAME=`echo ${f##*\/}`\r\n SERVERNAME=${SERVERNAME%.conf}\r\n \/etc\/init.d\/redis-server \"$1\" \"$SERVERNAME\"\r\ndone\r\nfi\r\n\r\nexit 0<\/pre>\nOnce that is done, we need to add multiple config files for our different buckets:<\/p>\n
mkdir \/etc\/redis\/servers\r\ncd \/etc\/redis\/servers\r\nvim www.nicovs.be.conf\r\n<\/pre>\nAnd enter some config settings looking like this:<\/p>\n
#Include the default redis settings\r\ninclude \/etc\/redis\/redis.conf\r\n\r\n#Only enable 1 Database for this instance, not the default 16 (or change the default in \/etc\/redis\/redis.conf to 1\r\ndatabases 1\r\n\r\n#Max amount of RAM this instance can use:\r\nmaxmemory 100mb\r\n\r\n#If no TTL is being set by the application using this instance, this policy will evict all keys by an approximated LRU algorithm as long as we hit the memory limit.\r\nmaxmemory-policy allkeys-lru\r\n\r\n#Placeholder to be able to save the DB to an rdb dump file.\r\n#save 900 1\r\n#save 300 10\r\n#save 60 10000\r\n\r\n#Pidfile\r\npidfile \/var\/run\/redis\/www.nicovs.be.pid\r\n#Which Port to use for this instance\r\nport 5033\r\n#Where to log the output of this instance\r\nlogfile \/var\/log\/redis\/www.nicovs.be.log\r\n\r\n# The RDB Dump base dir\r\ndir \/backups\/redis\r\n#The RDP Dump filename\r\ndbfilename www.nicovs.be.rdb\r\n\r\n## Security settings:\r\n# Disable the config command, so that customers are not able to change the server config from command line.\r\nrename-command CONFIG \"\"\r\n\r\nrequirepass aVery_Long_!1290-PasSwooo00Ord_ToProtectBruteForce<\/pre>\nCreating new instances is easily done by copying this initial conf file and adjusting the params (port, name, pid, savefilename, password,…)<\/p>\n
Now, if you want to start\/stop or restart all redis instances at the same time, this can be done with the normal service command:<\/p>\n
service redis-server start\r\nservice redis-server stop\r\nservice redis-server restart\r\nservice redis-server status<\/pre>\nThe new init script we create above, will simply index all config instances from \/etc\/redis\/servers and manage those 1 at a time.<\/p>\n
Or, if you only want to manage 1 instance at a time, just do something like this for example:<\/p>\n
service redis-server restart www.nicovs.be<\/pre>\nwhich will restart only the instance running for website www.nicovs.be<\/p>\n
Since we use this on a shared environment, we have a provisioning system in place, where our customers can change some settings<\/p>\n