Nova compute and cinder volume uses oslo concurrency
processuitls.execute to run privileged commands.
Containers inherit file descriptor limit from docker daemon
(currently:1048576) which is too high and leads to performance
issue. This patch sets nofile limit to 1024 for nova compute
and 131072 for cinder volume, which is reasonable as before
containers nova compute used host defaults i.e 1024 and cinder
volume systemctl override([1]) i.e 131072. Also updated neutron
l3, dhcp and ovs agent to use Parameters for ulimit configuration.
[1] https://review.rdoproject.org/r/#/c/1360/.
Closes-Bug: #1762455
Related-Bug: #1760471
Related-Bug: #1757556
Change-Id: I4d4b36de32f8a8e311efd87ea1c4095c5568dec4
yatin
70276931a4