[lxc-users] How to enable df inside a lxc container?

[C. L. Martinez]

On Thu, Nov 13, 2014 at 6:17 PM, Craig Ruff <cruff at ucar.edu> wrote:
> I do this by creating /etc/mtab inside the container at startup based on the
> contents of the lxc.fstab file that was bind mounted inside the container.
> I add lines prefixed with "#df" for other file systems bind mounted inside
> the container by means external to the lxc startup mechanisms.
>
> This is the contents of the /etc/lxc.init file that is run at container
> start.
>
> #!/bin/bash
>
> lxctab=/etc/lxc.fstab
> mtab=/etc/mtab
>
> [ -e $tab ] || return 0;
>
> first=1
> cat <<EOF > $mtab
> none   /        ext4   rw                  0 0
> proc   /proc    proc   nodev,noexec,nosuid 0 0
> devpts /dev/pts devpts defaults            0 0
> sysfs  /sys     sysfs  defaults            0 0
> EOF
>
> while read src dst type opts x y; do
>         if [ $first = 1 ]; then
>                 first=0
>                 prefix=${dst%/etc/lxc.fstab}
>                 continue
>         fi
>
>         case $src in
>         \#df) src=none ;;
>         esac
>
>         dst=${dst#$prefix}
>         case $dst in
>         /tmp)
>                 src=none
>                 chmod 1777 /tmp
>                 ;;
>
>         /var/tmp)
>                 src=none
>                 ;;
>         esac
>
>         echo "$src $dst $type $opts $x $y" >> $mtab
> done < $lxctab
>
> umount $lxctab
> exit 0
>
> Here is a sample lxc.fstab file:
>
> /containers/data-access1/lxc.fstab
> /containers/data-access1/rootfs/etc/lxc.fstab none bind,ro 0 0
> #/containers/data-access1/tmpfs /containers/data-access1/rootfs/tmp ext4
> defaults 0 0
> /containers/data-access1/rootfs/tmp /containers/data-access1/rootfs/var/tmp
> ext4 bind 0 0
> /containers/glade /containers/data-access1/rootfs/glade none
> rbind,create=dir 0 0
> /containers/data /containers/data-access1/rootfs/data none rbind,create=dir
> 0 0
> /nfs/home/dasg/authdb /containers/data-access1/rootfs/nfs/home/dasg/authdb
> nfs bind 0 0
> #df /glade/p gpfs bind 0 0
> #df /glade/scratch gpfs bind 0 0
> #df /glade/u gpfs bind 0 0
> #df /data/share gpfs bind 0 0
>
>

Many thanks to all. I will do some test and I will see how it goes.