Dimitry Naldayev wrote:
Looking at the HLFS build, it seems reasonable (to me, anyway) that
one might construct a small root filesystem with /boot, /dev, /lib,
/bin, and /sbin on it, and then mount /usr (if it needed to be
separate) and /opt, /home, /svr, etc as separate filesystems onto it.
Again, it seems natural to me to mount / as read-only; root can always
boot single-user and remount it rw if sysadmin needs to be done on it,
otherwise nothing should be written to it.
And yet, this does not seem possible. The rc script that init runs
ignores the options field (and /etc/fstab altogether) and simply
remounts / read-write. Why would I necessarily need to mount / rw?
Am I missing something obvious?
You are missing /etc. It mast be part of / (root fs) becouse init need some
information from there
Hm. I wonder if I could get by with just /etc/rc.d/rcsysinit.d on / in
order mount filesystems, one of which would be a "real" /etc in a
separate partition.
I need most of /etc to be outside of the / filesystem, because it's not
shareable - but that particular part should be common.
I'm doing basically the same thing with root's home dir, putting a small
/home/root on / (ro), that gets mounted over by another /home filesystem
on a different partition (mounted rw).
and several files in /etc need to be writable ;-/
Most famous is /etc/mtab and there workaround about this, but there are a
few other depending on what software you have installed
Archaic posted a file recommending replacing /etc/mtab with a link to
/proc/mounts.
I imagine that for other software, if they insisted on having writable
files in /etc, I could do the same thing: give them space in /var or
/srv and link to it from /etc.
-jps
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