Description of problem: User experiencing failure related to database being put out of cluster due to insufficient number of file descriptors. We have been following up with Damien Ciabrini from the engineering and found out that there's no straightforward way how to increase the hardcoded limit of 16384 file descriptors for galera. Version-Release number of selected component (if applicable): Openstack 13 How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Error in galera when trying to add more open files than the default limit of 16384 Expected results: Allow users to fully configure their mysql connections. Increase the mac number of mysql connections along with the max number of unix file descriptors. Additional info: Large amount of requested FD's leads to errors analyzed here: * galera-bundle-docker-0_monitor_60000 on ctrl-db-d-01 'unknown error' (1): call=58, status=complete, exitreason='monitor cmd failed (rc=126), output: rpc error: code = 2 desc = oci runtime error: exec failed: container_linux.go:247: starting', last-rc-change='Tue Mar 10 13:07:41 2020', queued=0ms, exec=0ms