Ulimits and varnish - should I increase?

Harri.Paivaniemi at tieto.com Harri.Paivaniemi at tieto.com
Thu Aug 4 15:11:38 CEST 2011

Hi all,

I'm starting to use varnish with a customer who has about 20 000 http req/s.

I'm trying to figure out if I need to increase ulimits for varnish-user or not (RHEL 6 64bit). In varnish-conf there is this default:

# Maximum number of open files (for ulimit -n)

# Locked shared memory (for ulimit -l)
# Default log size is 82MB + header

# Maximum size of corefile (for ulimit -c). Default in Fedora is 0

So, What are those NFILES,MEMLOCK and DAEMON_COREFILE_LIMIT doing... I mean that obviously those are not enough to raise those limits in the system? Should I put to security/limits-conf those values for varnish-user or to sysctl for all?

Thanks very many.


This is my ulimit now:

[root at fihgac4devproxy ~]# ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 30527
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 1024
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

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