[Openstack] Max open files limit for nova-api
Van Leeuwen, Robert
rovanleeuwen at ebay.com
Tue Dec 20 07:13:00 UTC 2016
Luckily you can easily compile your own:
This post shows the source code and how to build a tool like prlimit: http://lzone.de/cheat-sheet/ulimit
IMHO it is quite ugly to change it this way though.
I see this more as a tool for a process that cannot be restarted without causing issues.
The proper way would be to use systemd unit files or whatever is relevant in your setup.
Cheers,
Robert
From: Prashant Shetty <prashantshetty1985 at gmail.com>
Date: Monday, December 19, 2016 at 7:30 PM
To: John Petrini <jpetrini at coredial.com>
Cc: "openstack at lists.openstack.org" <openstack at lists.openstack.org>
Subject: Re: [Openstack] Max open files limit for nova-api
Thanks John. Seems like prlimit doesnt seems to be available for ubuntu 14.04 :-(
On Mon, Dec 19, 2016 at 11:51 PM, John Petrini <jpetrini at coredial.com<mailto:jpetrini at coredial.com>> wrote:
Hi Prashant,
On second thought that trick might only work on CentOS. You might have success using prlimit instead.
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On Mon, Dec 19, 2016 at 1:13 PM, Prashant Shetty <prashantshetty1985 at gmail.com<mailto: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<mailto: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<mailto: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<mailto: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<mailto: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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