Re: [gentoo-user] How to find out all openrc dependencies?

["J. Roeleveld" <joost@antarean.org>]

On Thursday, 11 April 2024 12:10:31 CEST Michael wrote:
> On Thursday, 11 April 2024 10:48:15 BST J. Roeleveld wrote:
> > On Thursday, 11 April 2024 11:35:10 CEST Michael wrote:
> > > On Thursday, 11 April 2024 06:19:57 BST J. Roeleveld wrote:
> > > > Hi all,
> > > > 
> > > > For a while I've been seeing the following ERROR-messages when booting
> > > > 1
> > > > of
> > > > my systems:
> > > > 
> > > > * ERROR: cannot start multipathd as localmount would not start
> > > > 
> > > >  * ERROR: cannot start zfs-import as localmount would not start
> > > > 
> > > > This isn't a big concern as these services will start correctly later:
> > > > 
> > > > INIT: Entering runlevel: 3
> > > > 
> > > >  * Starting multipathd ...
> > > >  [ ok ]
> > > >  * Importing ZFS pool(s)  ...
> > > >  [ ok ]
> > > > 
> > > > But I am trying to find the cause of these errors as they are
> > > > preventing
> > > > parallel-start from actually working correctly.
> > > > 
> > > > When I check with "rc-depend", I don't see an obious cause:
> > > > 
> > > > # /lib/rc/bin/rc-depend multipathd
> > > > sysfs devfs udev udev-trigger modules fsck root localmount multipathd
> > > > 
> > > > # /lib/rc/bin/rc-depend localmount
> > > > sysfs devfs udev udev-trigger modules fsck root localmount
> > > > 
> > > > # /lib/rc/bin/rc-depend zfs-import
> > > > multipath sysfs devfs udev udev-trigger modules fsck root localmount
> > > > multipathd zfs-import
> > > > 
> > > > # /lib/rc/bin/rc-depend multipath
> > > > multipath
> > > > 
> > > > From how I read these, it should be able to start "localmount"
> > > > properly
> > > > before even trying to start "multipathd" and "zfs-import"
> > > > There is also no technical dependency for "localmount" (the root
> > > > filesystem
> > > > is not on ZFS on this system)
> > > > 
> > > > Any help/suggestions on how to find the cause would be appreciated.
> > > > 
> > > > --
> > > > Joost
> > > 
> > > Check if hwclock is in the boot runlevel:
> > > 
> > > rc-update -s -v | grep hwclock
> > 
> > What does "hwclock" got to do with this?
> > It has no dependency with multipathd, zfs-import, localmount or anything
> > else that is showing an error.
> > 
> > --
> > Joost
> 
> Our systems are certainly different, but I noticed this dependency on my
> localmount which is missing on yours:
> 
> # /lib/rc/bin/rc-depend localmount
> sysfs devfs udev udev-trigger hwclock modules fsck root dmcrypt localmount
>                               ^^^^^^^
> Have you compared your system services which has this problem, with other
> systems of yours which can startup properly?

Adding additional dependencies into the tree is more likely to cause further 
issues. I am actually looking for how to quickly find out which dependency is 
causing a circular dependency issue as the first time it thinks it needs to 
start a service it fails. But the 2nd time it starts, it goes correctly.

I removed hwclock from ALL VMs as they don't actually have a hwclock.

I did find out the actual cause of the problem through a lot of trial and 
error, but this is not really useful in actually quickly finding the problem.
Being able to "simulate" the startup sequence for how OpenRC wants to do 
things would have simplified and sped up the entire process.

--
Joost