[arch-general] rootfs remains in ro at boot on fresh install with new December ISO

LANGLOIS Olivier PIS -EXT olivier.pis.langlois at transport.alstom.com
Tue Dec 4 10:46:01 EST 2012

Dave, Tom,

Thank you very much for your explanations. With your help, I have become a little bit less clueless about systemd and Arch initramfs system.

by typing systemctl status /, the reported status was ok/mounted with some green on the output. Nothing special to report about that. I wish that I could provide the exact text but I still suck at cut & pasting without a mouse!

However I have fixed my problem and I think that I have stumbled into a systemd bug. Since I didn't want a tmpfs mounted in /tmp, I did follow directives from the Beginners guide:

systemctl mask tmp.mount

The result of that thing is:

1. rootfs is ro.

2. My disk partition for /tmp speficied in fstab isn't mounted.

If I undo the change with:

systemctl unmask tmp.mount

everything comes back all right as expected.

Not sure if it does that systematically for any fstab setup or I have been unlucky to have an extraordinary and unique fstab setup (I don't think so).

Maybe someone could try to repeat the problem. If it is, then we have found a systemd bug, if not, I can share my fstab with interested parties.

> You'll want to actually provide your /etc/fstab as well as the output
> of:
>   systemctl status /
> Right after booting...
> > 5. Once logged, I have no problem doing "mount -o remount,rw /"
> > 6. I have removed the ro kernel parameter option in grub.cfg (BTW, why is
> this used at all? I'm a little bit ignorant about Linux booting good practices). By
> doing so rootfs still remains ro.
> 'ro' is the default if neither 'rw' nor 'ro' are specified. If you want your root to
> be mounted rw initially, you need to do 2 things:
> 1) explicitly add 'rw' to your kernel cmdline
> 2) include the fsck hook in your initramfs
> Otherwise, it's left up to your /etc/fstab to ensure that it's remounted
> properly.
> > I am suspecting either systemd or the content of the initramfs. Until now,
> those are still black boxes to me. What should I look at to resolve my rootfs
> ro problem?
> Strange suspicion... Without seeing it, I suspect your /etc/fstab is at fault,
> simply because I've learned better than to trust anecdotal evidnce.
> d

CONFIDENTIALITY : This e-mail and any attachments are confidential and may be privileged. If you are not a named recipient, please notify the sender immediately and do not disclose the contents to another person, use it for any purpose or store or copy the information in any medium.

More information about the arch-general mailing list