On Mon, Dec 3, 2012 at 6:00 PM, LANGLOIS Olivier PIS -EXT <olivier.pis.langl...@transport.alstom.com> wrote: > Hi, > > I hope it is not caused by the shortcut that I have taken to update my usb > install key from november iso to december iso as described in the other > thread. > > The first symptom that I have observed is that dhcpcd isn't able to update > /etc/resolv.conf > > I am going to provide as much relevant info so you can tell me what to look > for > > 1. Installed from december iso on newly created GPT ext4 partitions > 2. Bootloader GRUB2 > 3. Did a systemctl mask tmpfs as I am mounting a disk partition on /tmp from > fstab > 4. Double checked 2-3 times that all my mounts are rw in fstab > 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. > > 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?
There are two ways for / to be mounted rw: either by the initramfs by specifying "rw" on the kernelcommandline. Or by systemd remounting it based on your fstab, for that to happen you need to have an entry in fstab for your rootfs. Traditionally the second option was necessary to make it possible to fsck your rootfs. However, now that the initramfs has the fsck hook, this is no longer necessary, and you can just mount it 'rw' from the beginning, and skip remounting it later on. Cheers, Tom
