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Hi Preshant,

You can change the open file limit of the running process by echoing the
value to it. For example...

echo -n "Max open files=8192:unlimited"  > /proc/<PID>/limits


___

John Petrini



On Mon, Dec 19, 2016 at 12:21 PM, Prashant Shetty <
prashantshetty1985 at gmail.com> wrote:

> Hi Arne,
> Thanks for your reply. Currently all these services are running on ubuntu
> controller under screen.
> Do we have any option to set the file limit option for n-api service in
> this case?. I am not using systemd in my setup to run these services.
>
> Thanks,
> Prashant
>
> On Mon, Dec 19, 2016 at 10:19 PM, Arne Wiebalck <Arne.Wiebalck at cern.ch>
> wrote:
>
>> Prashant,
>>
>> If this is for systemd, how about changing the nova-api unit file?
>>
>> Something like
>>
>> —>
>> [Service]
>> ...
>> LimitNOFILE=65536
>> <—
>>
>> should do it.
>>
>> Cheers,
>>  Arne
>>
>>
>>
>> On 19 Dec 2016, at 17:23, Prashant Shetty <prashantshetty1985 at gmail.com>
>> wrote:
>>
>> Team,
>>
>> I have scale setup and metadata requests are seems to fail from instance.
>> Main reason for failure is "Max open files" limit(1024) set on nova-api
>> service.
>> Though on controller we have set max open file limit of 65k(limit.conf),
>> nova-api always comes up with 1024 limit causing failure.
>>
>> Could someone let me know how can we change the max open files limit of
>> nova-api service?
>>
>> Setup Details:
>>
>> ·         Single controller
>> ·         500 KVM computes
>> ·         Devstack branch: stable/newton
>> ·         We have native metadata and dhcp running on platform
>> ·         3750 instances
>>
>>
>> stack at controller:/opt/stack/logs$ ps aux | grep nova-api
>> stack 14998 2.2 0.3 272104 121648 pts/8 S+ 09:53 0:14 /usr/bin/python
>> /usr/local/bin/nova-api
>> stack at controller:/opt/stack/logs$
>> stack at controller:/opt/stack/logs$
>> stack at controller:/opt/stack/logs$ cat /proc/14998/limits
>> Limit Soft Limit Hard Limit Units
>> Max cpu time unlimited unlimited seconds
>> Max file size unlimited unlimited bytes
>> Max data size unlimited unlimited bytes
>> Max stack size 8388608 unlimited bytes
>> Max core file size unlimited unlimited bytes
>> Max resident set unlimited unlimited bytes
>> Max processes 128611 128611 processes
>> Max open files 1024 4096 files
>> Max locked memory 65536 65536 bytes
>> Max address space unlimited unlimited bytes
>> Max file locks unlimited unlimited locks
>> Max pending signals 128611 128611 signals
>> Max msgqueue size 819200 819200 bytes
>> Max nice priority 0 0
>> Max realtime priority 0 0
>> Max realtime timeout unlimited unlimited us
>> stack at controller:/opt/stack/logs$
>>
>> n-api:
>>
>> 2016-11-08 18:44:26.168 30069 INFO nova.metadata.wsgi.server
>> [req-fb4d729b-a1cd-4df1-aaf8-3f854a739cce - -] (30069) wsgi exited,
>> is_accepting=True
>> Traceback (most recent call last):
>>   File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/hub.py",
>> line 457, in fire_timers
>>     timer()
>>   File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/timer.py",
>> line 58, in __call__
>>     cb(*args, **kw)
>>   File "/usr/local/lib/python2.7/dist-packages/eventlet/event.py", line
>> 168, in _do_send
>>     waiter.switch(result)
>>   File "/usr/local/lib/python2.7/dist-packages/eventlet/greenthread.py",
>> line 214, in main
>>     result = function(*args, **kwargs)
>>   File "/opt/stack/nova/nova/utils.py", line 1066, in context_wrapper
>>     return func(*args, **kwargs)
>>   File "/usr/local/lib/python2.7/dist-packages/eventlet/wsgi.py", line
>> 865, in server
>>     client_socket = sock.accept()
>>   File "/usr/local/lib/python2.7/dist-packages/eventlet/greenio/base.py",
>> line 214, in accept
>>     res = socket_accept(fd)
>>   File "/usr/local/lib/python2.7/dist-packages/eventlet/greenio/base.py",
>> line 56, in socket_accept
>>     return descriptor.accept()
>>   File "/usr/lib/python2.7/socket.py", line 206, in accept
>>     sock, addr = self._sock.accept()
>> error: [Errno 24] Too many open files
>>
>> Thanks,
>> Prashant
>>
>> _______________________________________________
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>>
>> --
>> Arne Wiebalck
>> CERN IT
>>
>>
>
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