When starting redis 3.0.6 (installed from jessie-backports) under Debian 8.4 jessie, I get the following warning/error:
18127:M 13 Apr 15:12:38.730 # You requested maxclients of 10000 requiring at least 10032 max file descriptors.
18127:M 13 Apr 15:12:38.730 # Redis can't set maximum open files to 10032 because of OS error: Operation not permitted.
18127:M 13 Apr 15:12:38.730 # Current maximum open files is 4096. maxclients has been reduced to 4064 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.
When running ulimit -n
as root I get:
65536
The open file limit for the redis user:
$ ps -u redis
PID TTY TIME CMD
18127 ? 00:00:00 redis-server
$ sudo grep 'open files' /proc/18127/limits
Max open files 4096 4096 files
How do I increase the open files limit for the redis user, so it can set the appropriate limit for the maxclients setting? I tried editing /etc/security/limits.conf
and sysctl -w fs.file-max=2459017
, but none really worked for the redis user.
Best Answer
limits.conf does not apply to systemd services (https://bugzilla.redhat.com/show_bug.cgi?id=754285)
so you should:
edit /lib/systemd/system/redis-server.service and add to the [Service] section the line (after:
User=redis
andGroup=redis
)LimitNOFILE=65536
run:
systemctl daemon-reload && systemctl restart redis-server
and ... it should get the new limit
check: https://sskaje.me/systemd-ulimit/
good luck!