Open Stack

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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