As we discussed with Alexandr Didenko, the same <NOSRV> log message could be related to the high rise 150 value in the haproxy config for the keystone backends. Among with the fastinter 2s, it makes *every* apache2 restart to mark keystone backend DOWN for 2x150 seconds, thus, making the deployment fail as well. But it still makes sense to raise defaults for MaxClients and ServerLimits
As we discussed with Alexandr Didenko, the same <NOSRV> log message could be related to the high rise 150 value in the haproxy config for the keystone backends. Among with the fastinter 2s, it makes *every* apache2 restart to mark keystone backend DOWN for 2x150 seconds, thus, making the deployment fail as well. But it still makes sense to raise defaults for MaxClients and ServerLimits