[Openstack] Max open files limit for nova-api

Jose Manuel Ferrer Mosteiro jmferrer.paradigmatecnologico at gmail.com
Tue Dec 20 11:12:19 UTC 2016


 

You cannot modify /proc/3070/limits without root permissions.

Try: 

###
sudo su -
echo -n "Max open files=8192:unlimited" > /proc/3070/limits
### 

El 2016-12-19 19:21, John Petrini escribió: 

> Hi Prashant, 
> 
> On second thought that trick might only work on CentOS. You might have success using prlimit instead. 
> 
> ___ 
> 
> John Petrini 
> 
> NOC Systems Administrator // COREDIAL, LLC // coredial.com [1] // [2] [3] [4] [5] 
> Hillcrest I, 751 Arbor Way, Suite 150, Blue Bell PA, 19422 
> P: 215.297.4400 x232 // F: 215.297.4401 // E: jpetrini at coredial.com 
> 
> [6] 
> 
> The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. 
> 
> On Mon, Dec 19, 2016 at 1:13 PM, Prashant Shetty <prashantshetty1985 at gmail.com> wrote:
> 
> Hi John,
> 
> Echo option doesnt seems to work on below controller.
> 
> stack at devstackvm:~$ cat /etc/lsb-release 
> DISTRIB_ID=Ubuntu
> DISTRIB_RELEASE=14.04
> DISTRIB_CODENAME=trusty
> DISTRIB_DESCRIPTION="Ubuntu 14.04.5 LTS"
> stack at devstackvm:~$ 
> 
> stack at devstackvm:~$ ps aux | grep nova-api
> stack 3070 1.1 0.1 271576 121092 pts/9 S+ Dec16 50:29 /usr/bin/python /usr/local/bin/nova-api
> stack 3079 0.3 0.8 1045308 881676 pts/9 S+ Dec16 14:32 /usr/bin/python /usr/local/bin/nova-api
> stack 3080 0.2 0.1 324808 161096 pts/9 S+ Dec16 9:25 /usr/bin/python /usr/local/bin/nova-api
> stack 3081 0.2 0.7 980172 816468 pts/9 S+ Dec16 10:37 /usr/bin/python /usr/local/bin/nova-api
> stack 3082 0.3 0.1 336824 173288 pts/9 S+ Dec16 16:11 /usr/bin/python /usr/local/bin/nova-api
> stack 3083 0.4 0.1 338788 175264 pts/9 S+ Dec16 19:05 /usr/bin/python /usr/local/bin/nova-api
> stack 3084 0.4 0.1 336616 172912 pts/9 S+ Dec16 17:41 /usr/bin/python /usr/local/bin/nova-api
> stack 3085 0.2 0.8 1054900 891272 pts/9 S+ Dec16 10:09 /usr/bin/python /usr/local/bin/nova-api
> stack 3086 0.2 0.1 325088 161228 pts/9 S+ Dec16 9:59 /usr/bin/python /usr/local/bin/nova-api
> stack 3097 0.2 0.1 308088 151828 pts/9 S+ Dec16 11:10 /usr/bin/python /usr/local/bin/nova-api
> stack 3098 0.2 0.1 308296 152360 pts/9 S+ Dec16 11:15 /usr/bin/python /usr/local/bin/nova-api
> stack 3099 0.2 0.1 308708 152544 pts/9 S+ Dec16 11:42 /usr/bin/python /usr/local/bin/nova-api
> stack 3100 0.2 0.1 309588 153624 pts/9 S+ Dec16 11:06 /usr/bin/python /usr/local/bin/nova-api
> stack 3101 0.2 0.1 308372 152396 pts/9 S+ Dec16 11:14 /usr/bin/python /usr/local/bin/nova-api
> stack 3102 0.2 0.1 308084 152052 pts/9 S+ Dec16 11:10 /usr/bin/python /usr/local/bin/nova-api
> stack 3103 0.2 0.1 308380 152416 pts/9 S+ Dec16 11:09 /usr/bin/python /usr/local/bin/nova-api
> stack 3104 0.2 0.1 307652 151560 pts/9 S+ Dec16 10:29 /usr/bin/python /usr/local/bin/nova-api
> stack 8087 0.0 0.0 11752 2044 pts/21 S+ 10:07 0:00 grep --color=auto nova-api
> stack at devstackvm:~$
> 
> stack at devstackvm:~$ cat /proc/3070/limits | grep "Max open files"
> Max open files 1024 4096 files 
> stack at devstackvm:~$
> stack at devstackvm:~$ echo -n "Max open files=8192:unlimited" > /proc/3070/limits 
> -bash: /proc/3070/limits: Permission denied
> stack at devstackvm:~$ sudo echo -n "Max open files=8192:unlimited" > /proc/3070/limits 
> -bash: /proc/3070/limits: Permission denied
> stack at devstackvm:~$ 
> 
> root at devstackvm:/home/stack# echo -n "Max open files=8192:unlimited" > /proc/3070/limits
> bash: echo: write error: Invalid argument
> root at devstackvm:/home/stack# 
> 
> On Mon, Dec 19, 2016 at 11:27 PM, John Petrini <jpetrini at coredial.com> wrote:
> 
> 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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