[systemd-devel] Questions about initrd environment services and IgnoreOnIsolate

[Andrei Borzenkov]

On 12.05.2024 18:19, Carolina Jubran wrote:
> Hello!
> 
> I need help with a systemd service that loads RDMA and InfiniBand drivers. The service unit specifies DefaultDependencies=no. However, when the service starts in initrd, it gets terminated when initrd-cleanup.service isolates for initrd-switch-root.target in the middle of the initialization.
> 

Then make your service

Before=initrd-switch-root.target

assuming it is added to the default transaction. You need to make sure 
your service is not considered started until drives are loaded.

> My first question is, what are the correct dependencies required to run this service in the initrd environment? I tried adding IgnoreOnIsolate=true under the Unit section, and it helped, but I'm unsure if that is the correct solution.
> 
> My second question is, how does IgnoreOnIsolate=true affect the system in initrd? Will this solve the problem, or could it potentially introduce unforeseen issues?
> 
> Thank you,
> Carolina Jubran
>