Move Gitlab CE in a VM to another VM (different private IP)

I have a Gitlab CE 11.8.0 (ce13864) running in a VM, I now need to move the VM to another datacenter which has different private IP. I have no problems to copy the VM over and power it on.
However the private IP has changed. What do I need to do after IP change?
I noticed runners (not moved) are not working, CI jobs are all stuck.