first thought put it in lxc-create
then again, conversion is needed too hence i also want an lxc-convert
i am coming from a qemu background
so qemu-img does create and convert
so optimum is to see an lxc-convert and have that function also
available as part of lxc-create
On Fri, Jul 1, 2011 at 8:31 PM, Serge E. Hallyn <se...@hallyn.com> wrote:
> Hey,
>
> so lxc-clone will create a snapshot-based clone of an lvm-backed
> container in about a second. Creating the first lvm-backed
> container is a bit of a pain though. I do it using the script
> below, called 'lxclvmconvert' on my machine. So I do
>
> lxc-create -t ubuntu -f /etc/lxc.conf -n mavbase -- -r maverick
> lxclvmconvert mavbase
>
> and from then on I can do fast
>
> lxc-clone -s -o mavbase -n mav-bugxyz
>
> My question is, where do we want to put this functionality? Of course
> I *can* put it in the ubuntu template itself, but I'm leary of adding
> too many options to that. Consider that just for the lvm support we'd
> need to add optional arguments for:
>
> backing store type: (lvm, loopback file, real blockdev)
> backing store fstype
> backing store size
> other options, i.e. lvm volume group name
>
> So, do you think it would be better for the container creation templates
> to offer this support, or to have a separate tool, not lxclvmconvert, but
> maybe 'lxc-convert', which converts a container from any supported backing
> type to any other. Backing types I guess could start out by including
>
> directory (the current way)
> lvm
> loopback file
> raw device
>
> thanks,
> -serge
>
> #!/bin/sh
>
> if [ $# -lt 1 ]; then
> echo "Usage: $0 container-name <size> <fstype>"
> exit 1
> fi
>
> c=$1
> size=2G
> fstype=ext3
> echo "converting container $c"
>
> if [ $# -gt 1 ]; then
> size=$2
> echo "Using size $size"
> fi
>
> if [ $# -gt 2 ]; then
> fstype=$3
> echo "Using fstype $fstype"
> fi
>
> if [ ! -d /var/lib/lxc/$c/rootfs ]; then
> echo "Container $c doesn't seem to exist?"
> exit 1
> fi
>
> if [ -e /dev/lxc/$c ]; then
> echo "/dev/lxc/$c already exists. Bailing"
> exit 1
> fi
>
> lvcreate -L $size -n $c lxc || cleanup
> sleep 1
> mkfs -t $fstype /dev/lxc/$c
> if [ $? -ne 0 ]; then
> echo "Failed to create the filesystem"
> lvremove -f /dev/lxc/$c
> exit 1
> fi
>
> mkdir /var/lib/lxc/$c/lvm || { lvremove -f /dev/lxc/$c; exit 1; }
> mount -t $fstype /dev/lxc/$c /var/lib/lxc/$c/lvm || { lvremove -f
> /dev/lxc/$c; exit 1; }
> rsync -va /var/lib/lxc/$c/rootfs/ /var/lib/lxc/$c/lvm || echo "Rsync had
> errors, you may want to check; continuing"
> umount /var/lib/lxc/$c/lvm
> rmdir /var/lib/lxc/$c/lvm
> rm -rf /var/lib/lxc/$c/rootfs
> mkdir /var/lib/lxc/$c/rootfs
>
> sed -i '/lxc.rootfs/d' /var/lib/lxc/$c/config
> echo "lxc.rootfs = /dev/lxc/$c" >> /var/lib/lxc/$c/config
>
> echo "Finished"
>
>
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