Subject: Re: [vserver] Problem with bind mount
From: "John A. Sullivan III" <jsullivan@opensourcedevel.com>
Date: Wed, 19 Aug 2009 06:51:24 -0400

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

-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan@opensourcedevel.com

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