lots of semaphores in jails

[Aristedes Maniatis]

I'm running a monitoring application called zabbix in each of about 32 jails on a single host and running into a problem...

zabbix_agentd [78335]: cannot create Semaphore: [28] No space left on device
zabbix_agentd [78335]: unable to create mutex for log file

Now, typically the solution to this problem is documented here: https://www.zabbix.org/wiki/How_to/configure_shared_memory

Basically we bump up some ipc settings:

  kern.ipc.shmall=409600
  kern.ipc.shmmax=204800000

and allow ipc inside the jails:

  security.jail.sysvipc_allowed=1

With these settings I can get about 30 jails running with zabbix, but then no more zabbix instances will start. I guess I'm hitting some sort of limit, but I'm at a loss to understand what. Here is the output of ipcs and all the sysctls: https://gist.github.com/ari/a0a8b540f2ef832c41d2


How do I correlate my maximum settings with the data I'm seeing from ipcs? What limit am I hitting?


Cheers
Ari



-- 
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Aristedes Maniatis
ish
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