[vserver] Problem with bind mount

From: Erdem Bayer <ebayer_at_bayer.gen.tr>
Date: Wed 19 Aug 2009 - 11:23:59 BST
Message-ID: <20090819132359.3cab84b0@ag6b-neptune-03>

Hi

I have a debian lenny i386 vserver running on lenny amd64 host with the following fstab entry:

none /proc proc defaults 0 0
none /tmp tmpfs size=256m,mode=1777 0 0
none /dev/pts devpts gid=5,mode=620 0 0
/home /home bind bind 0 0
/iscsi/www /var/www bind bind 0 0
/iscsi/log/concero /var/log bind bind 0 0

When I start a vserver, I see these errors in the output:

secure-mount: mount(): Invalid argument
/etc/vservers/concero/fstab:5:1: failed to mount fstab-entry
secure-mount: mount(): Invalid argument
/etc/vservers/concero/fstab:6:1: failed to mount fstab-entry

But the vserver starts and the directories in fstab file are mounted anyway.

I don't know if it makes a difference but /home fs is ext3, /iscsi is formatted with ocfs2 and mounted with iscsi. I can mount them manually with the following command:

sudo mount --bind /iscsi/log/concero /etc/vservers/concero/vdir/var/log

When I dig deeper I found that secure-mount is called with the following parameters:

++ pushd /etc/vservers/concero/vdir
++ test -w etc -o -w etc/mtab
++ /usr/lib/util-vserver/secure-mount -a --chroot --fstab /etc/vservers/concero/fstab --rootfs no

Here are the strace of the manual running of secure-mount (if it helps):

chroot(".") = 0
chdir("/") = 0
fchdir(3) = 0
chroot(".") = 0
chdir("/var/www") = 0
open(".", O_RDONLY|O_DIRECTORY) = 6
fchdir(4) = 0
chroot(".") = 0
fchdir(6) = 0
close(6) = 0
mount("/iscsi/www", ".", 0x7fffdf03e67f, MS_NODEV|MS_BIND, 0x7f9ad703f070) = 0
fchdir(3) = 0
chroot(".") = 0
chdir("/var/www") = 0
open(".", O_RDONLY|O_DIRECTORY) = 6
fchdir(4) = 0
chroot(".") = 0
fchdir(6) = 0
close(6) = 0
mount("/iscsi/www", ".", 0x7fffdf03e67f, MS_NODEV|MS_REMOUNT, NULL) = -1 EINVAL (Invalid argument)
write(2, "secure-mount: mount()"..., 21secure-mount: mount()) = 21
write(2, ": "..., 2: ) = 2
write(2, "Invalid argument"..., 16Invalid argument) = 16
write(2, "\n"..., 1
) = 1
write(2, "/etc/vservers/concero/fstab"..., 27/etc/vservers/concero/fstab) = 27
write(2, ":5:1"..., 4:5:1) = 4
write(2, ": failed to mount fstab-entry\n"..., 30: failed to mount fstab-entry
) = 30
chdir("/") = 0
fchdir(3) = 0

chroot(".") = 0
chdir("/var/log") = 0
open(".", O_RDONLY|O_DIRECTORY) = 6
fchdir(4) = 0
chroot(".") = 0
fchdir(6) = 0
close(6) = 0
mount("/iscsi/log/concero", ".", 0x7fffdf03e6a9, MS_NODEV|MS_BIND, 0x7f9ad703f090) = 0
fchdir(3) = 0
chroot(".") = 0
chdir("/var/log") = 0
open(".", O_RDONLY|O_DIRECTORY) = 6
fchdir(4) = 0
chroot(".") = 0
fchdir(6) = 0
close(6) = 0
mount("/iscsi/log/concero", ".", 0x7fffdf03e6a9, MS_NODEV|MS_REMOUNT, NULL) = -1 EINVAL (Invalid argument)
write(2, "secure-mount: mount()"..., 21secure-mount: mount()) = 21
write(2, ": "..., 2: ) = 2
write(2, "Invalid argument"..., 16Invalid argument) = 16
write(2, "\n"..., 1
) = 1
write(2, "/etc/vservers/concero/fstab"..., 27/etc/vservers/concero/fstab) = 27
write(2, ":6:1"..., 4:6:1) = 4
write(2, ": failed to mount fstab-entry\n"..., 30: failed to mount fstab-entry
) = 30
close(5) = 0
_exit(0) = ?

Kind Regards
Erdem Bayer
Received on Wed Aug 19 11:25:52 2009

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