I am user of Openshift online and OKD. I am facing similar issue in both places. Please have a look.

1. I have created a project.
2. I have launched php in Developer's Catalog option. With other details, I entered my project's git url, project is cloned successfully. Now it needs to connect to mysql database only.
3. In Pods, I deployed mysql image from 'Deploy Image' option. It is launched successfully.
4. When I make mysql connection from php pod to mysql pod, it does not connect, connection time out.
How should I make connection?

Note :
I do not have datastore option to launch mysql from developer's catalog in openshift online, that's why I am launching mysql image from deploy image.