Re: Setting open files for a process started by runit (using chpst)

From: Colin Booth <>
Date: Fri, 13 May 2016 11:54:53 -0700

On Fri, May 13, 2016 at 8:57 AM, Aaron Cline <> wrote:
> Hello:
> We have servers that use runit to manage our deployed processes (tomcat and
> logstash). We had some issues with having too many open files in our
> tomcat processes and so we're trying to increase the limit. I'm using the
> /proc/<PID>/limits file to check to make sure the limits are increased.
> We've tried increasing the limits in /etc/security/limits.conf, but that
> didn't seem to work for the runit processes. Then I found the chpst man
> page and started adding the -o option with a higher open files number
> there, but that also doesn't seem to increase the number for neither the
> tomcat or logstash process according to the proc filesystem.
> Is there some other gotcha I'm missing here?
>From the bit of experimenting that I did, it looks like chpst cannot
currently (or never could, not sure) change hard limits. Presumably
the default hard limit for logstash is too low, so even if you were
bumping the limit with chpst, it was getting cut off at the hard limit
value. If you're running your run script initially as root you can use
ulimit within the script, something like:
ulimit -n unlimited
chpst -u user-to-change-to -o real-limit prog

Or, if you're worried about logstash going berserk and eating all the
available open fds since non-privileged users can increase the soft
limit up to the hard limit, ulimit -n biggervalue will adjust both the
hard and soft limits, letting you omit chpst's -o option entierly.


"If the doors of perception were cleansed every thing would appear to
man as it is, infinite. For man has closed himself up, till he sees
all things thru' narrow chinks of his cavern."
  --  William Blake
Received on Fri May 13 2016 - 18:54:53 UTC

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