Hi,
I have the following problem: I have an external media USB drive which I
want to automatically power on and mount it into a virtual environment
(OpenVZ). Something similar like to mounting into chroot.
On the host, the drive should be mounted to
/var/lib/vz/root/500/media/media which correspondents /media/media
inside the virtual OpenVZ container.
The USB drive is connected to a powerhub which can be switched from a
script. The drive should only be switched on when it is needed and
switched off again afterwards. As a solution I would have the following
ideas (both are not yet working :-( ):
1.) Defining a direct mount:
# cat /etc/auto.master
/- auto.misc --timeout=5
# cat /etc/auto.misc
/var/lib/vz/root/500/media/media -fstype=vfat,defaults :/dev/media
But I see no way here to execute a script in order to power on the
drive. Is there a way?
2.) By using indirect mounts I can use a script. But unfortunately I do
*not* want to have an indirect mount inside the VE. So my idea would be
to first mount the drive indirectly to /media/auto/*:
# cat /etc/auto.master
/media/auto /usr/local/sbin/autofs-mount.sh --timeout=5 --ghost
The script powers on the drive, waits until the device node exists and
returns the options. This works quite good. But now I want the content
to appear in /var/lib/vz/root/500/media/media. Normally I would just
take a symlink and everything would be fine. But due to the nature of
the OpenVZ container ("chroot") I rather need a bind mount. So I tried:
# cat /etc/auto.master
/- auto.misc --timeout=5
# cat /etc/auto.misch
/var/lib/vz/root/500/media/media -fstype=none,bind :/media/auto/media
But unfortunately this does not seem to work:
# ls -la /media/auto/media/
(directory content - works)
# ls -la /var/lib/vz/root/500/media/media/
ls: cannot open directory /var/lib/vz/root/500/media/media/: No such
file or directory
And this is the debug output:
[...]
lookup_mount: lookup(file): looking up /var/lib/vz/root/500/media/media
lookup_mount: lookup(file): /var/lib/vz/root/500/media/media ->
-fstype=none,bind :/media/auto/media
parse_mount: parse(sun): expanded entry: -fstype=none,bind
:/media/auto/media
parse_mount: parse(sun): gathered options: fstype=none,bind
parse_mount: parse(sun): dequote(":/media/auto/media") -> :/media/auto/media
parse_mount: parse(sun): core of entry: options=fstype=none,bind,
loc=:/media/auto/media
sun_mount: parse(sun): mounting root /-, mountpoint
/var/lib/vz/root/500/media/media, what /media/auto/media, fstype none,
options bind
do_mount: /media/auto/media /var/lib/vz/root/500/media/media type none
options bind using module generic
mount_mount: mount(generic): calling mkdir_path
/var/lib/vz/root/500/media/media
mount_mount: mount(generic): warning: /var/lib/vz/root/500/media/media
is already mounted
send_ready: token = 174
mounted /var/lib/vz/root/500/media/media
[...]
Is there any way to solve my problem? I have Debian lenny with the
autofs5 package.
Thank you very much.
Best regards,
Luke
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