Re: [vserver] Problem with bind mount

On Wed, 2009-08-19 at 13:23 +0300, Erdem Bayer wrote:
> 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
Might it be faster and easier to do the bind mounts from the host,
e.g.,
/somesource/iscsi/log/concero /vservers/vserver1/var/log bind bind 0 0

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John A. Sullivan III
Open Source Development Corporation
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