If you need to use LDAP for authentication in OpenShift 4, the documentation is pretty clear and everything works nicely .
But if you need to grant privileges based on LDAP groups , the situation gets complicated.
Continue reading OpenShift 4: Automatic LDAP group synchronization
The synchronization from  works ok but you need to run it manually. I was searching for an automated solution and I have found a definition  which works for OpenShift 3.x so I updated it work with OpenShift 4 and here it is :
If your pod exited with exit code 137 so you see something like this in pod Details page:
Last State Terminated at Jan 7, 2018 5:00:15 PM with exit code 137 (Error)
your pod has been killed with signal 9. Continue reading Openshift: exit code 137
If you tried to add node to your etcd cluster and it failed, your cluster may have lost quorum and will not start again. To recover it you need to create new cluster identity. This is a short howto. Continue reading How to recover containerized etcd in Openshift cluster
If you need to periodically run some job in OpenShift you have several options. Continue reading Cron jobs in OpenShift