Start the service before microshift starts

[neetabisht]

Hi Team,

I need to ensure that a fetch_hostname system service starts before the MicroShift service.
I took a reference of microshift-ovs-init.service and accordingly created fetch_hostname.service as below:

[Unit]
Description=Fetch hostname
Before=microshift.service

[Service]
Type=oneshot
ExecStart=/bin/bash /usr/bin/fetch_hostname.sh

I've tried several combinations, such as starting the fetch_hostname.service after the crio and network services, but nothing seems to be working. The fetch_hostname.service is not at all starting before the microshift service.
Is there any other way to start any service before microshift service starts.

[pacevedom]

Hi,

Just using the Before= wont be enough, as there is no hard dependency between the services, MicroShift is not aware of fetch_hostname.
You will need to use a drop in configuration for MicroShift to add Requires= and After=. Something like:

[Unit]
Requires=fetch_hostname.service
After=fetch_hostname.service

Then store this in /etc/systemd/system/microshift.service.d/hostname.conf, run systemctl daemon-reload and relaunch MicroShift with systemctl start microshift.service.

Thanks.