On Friday 01 August 2014 16:44:11 Canek Peláez Valdés wrote:
> I was only offering options. The OP will use whatever he decides to use.
All interesting stuff. Personally, I'm not ready to go for systemd, as the
openrc system I have works well for me and I understand it (mostly).
I settled on an init script to set up the chroot, with a suitable mtab ready
to be copied in. For anyone who's interested, this is the init:
start() {
ebegin "Mounting 32-bit chroot dirs"
mount -t proc /proc /mnt/atom/proc
mount --rbind /dev /mnt/atom/dev
mount --rbind /sys /mnt/atom/sys
mount -t nfs 192.168.0.2:/usr/portage/packages
/mnt/atom/usr/portage/packages
cp /root/mtab.atom /mnt/atom/etc/mtab
eend $? "An error occurred while attempting to mount 32-bit chroot
directories"
}
stop() {
ebegin "Unmounting 32-bit chroot dirs"
rm /mnt/atom/etc/mtab
umount -f /mnt/atom/dev/mqueue
umount -f /mnt/atom/dev/pts
umount -f /mnt/atom/dev/shm
umount -f /mnt/atom/dev
umount -f /mnt/atom/proc
umount -f /mnt/atom/sys/fs/cgroup/openrc
umount -f /mnt/atom/sys/fs/cgroup/cpuset
umount -f /mnt/atom/sys/fs/cgroup/cpu
umount -f /mnt/atom/sys/fs/cgroup/cpuacct
umount -f /mnt/atom/sys/fs/cgroup/freezer
umount -f /mnt/atom/sys/fs/cgroup
umount -f /mnt/atom/sys/kernel/debug
umount -f /mnt/atom/sys
umount -f /mnt/atom/usr/portage/packages
eend $? "An error occurred while attempting to unmount 32-bit chroot
directories"
}
(I've omitted several sleeps from the /stop/ procedure.) If I left out any of
the lower-level umounts, the ones above it would fail.
# cat /root/mtab.atom
devtmpfs /dev devtmpfs rw,relatime,size=8201684k,nr_inodes=2050421,mode=755 0 0
/sys /sys none rw,bind,rbind 0 0
/dev /dev none rw,bind,rbind 0 0
proc /proc proc rw,relatime 0 0
tmpfs /run tmpfs rw,nosuid,nodev,relatime,size=1640604k,mode=755 0 0
mqueue /dev/mqueue mqueue rw,nosuid,nodev,noexec,relatime 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620 0 0
shm /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,nosuid,nodev,noexec,relatime 0 0
cgroup_root /sys/fs/cgroup tmpfs
rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755 0 0
openrc /sys/fs/cgroup/openrc cgroup
rw,nosuid,nodev,noexec,relatime,release_agent=/lib64/rc/sh/cgroup-release-agent.sh,name=openrc
0 0
cpuset /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0
cpu /sys/fs/cgroup/cpu cgroup rw,nosuid,nodev,noexec,relatime,cpu 0 0
cpuacct /sys/fs/cgroup/cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpuacct 0 0
freezer /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0
/dev/mapper/vg7-atom / ext4 rw,relatime,commit=0 1 2
That probably has a lot more stuff in it than I need; I just removed the
things I certainly didn't need from a copy of the host mtab.
There's a similar init script and mtab for the other chroot.
I've no doubt all you systemd people will throw up your hands in dismay at the
work involved in setting that up. It didn't take long, really.
--
Regards
Peter
