I have two services A and B where B is dependent on A which means in the A's service unit i have After and Requires set to B
Now when i stop the service B the service A also stops. And then after stopping B when i start it, the service A is not started and i have to start it manually.
systemctl stop B (A is also stopped) systemctl start B (A is not started) systemctl start A (I have to start A manually)
But if the service A is already stopped and i restart service B then the B and A both are started by the systemctl
systemctl stop A systemctl restart B (B and A both are started)
My question is what is difference between start and restart for the kind of service unit i have for A?