Description of problem: TripleO sets ulimits for different containers since RHOSP 13 [1]. Default value for neutron services and nova-compute is 1024. This default doesn't work well for nova-compute with huge number of attached disks, so I have reported bug [2]. Today customer informed me that neutron services are ALSO AFFECTED: he faced issues with DHCP agents after creating 250 tenant networks (quite low number) and was able to solve them after increasing default ulimit value by defining DockerNeutronDHCPAgentUlimit. I have asked neutron developers to provide recommendations for defaults for the following parameters and was told to report the bug: DockerNeutronDHCPAgentUlimit DockerNeutronL3AgentUlimit DockerOpenvswitchUlimit [1] https://review.openstack.org/#/c/560991/ [2] https://bugzilla.redhat.com/show_bug.cgi?id=1693667
Patches backported to stable/queens and stable/rocky branches. Should be synced in next z-stream release.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2019:1738