[one-users] Ceph snapshot

[Ruben S. Montero]

Excellent, thanks for the update...

On Fri Jan 16 2015 at 3:10:21 PM Fabian Zimmermann <dev.faz at gmail.com>
wrote:

> Hi,
>
> answering myself:
>
> Am 16.01.15 um 13:59 schrieb Fabian Zimmermann:
> > Hi,
> >
> > Am 22.10.14 um 10:42 schrieb Ruben S. Montero:
> >> They should be supported for RBD 2 images, you may want to take a look
> to
> >> the actual cloning process in tm/ceph/clone
> > looks like /var/lib/one/remotes/tm/ceph/cpds is used in case of a hot
> > hdd-snapshot.
> yes, because ceph would block the deletion of the source-image until the
> new image is flatten and all snapshots are removed.
> > Should one use this script to create a hot snapshot?
> >
> > If yes, is it a good idea to reuse the
> >
> > if RBD_FORMAT=2
> > then
> >    clone
> > else
> >   copy
> >
> > system of tm/ceph/clone in tm/ceph/cpds or may this lead to other
> problems?
> Already asked at ceph-mailinglist if "rbd cp" is doing an internal
> snapshot to protect consistency of data. If not a "snap, protect,
> flatten, unprotect, rm" would be done with the following patch:
>
> --
> --- cpds.orig    2015-01-16 14:09:10.116016425 +0100
> +++ cpds    2015-01-16 15:00:26.666220420 +0100
> @@ -1,5 +1,7 @@
>  #!/bin/bash
>
> +echo $* > /tmp/$$
> +
>  #
> --------------------------------------------------------------------------
> #
>  # Copyright 2002-2014, OpenNebula Project (OpenNebula.org), C12G
> Labs        #
>  #
> #
> @@ -80,8 +82,27 @@
>      RBD="$RBD --id ${CEPH_USER}"
>  fi
>
> +RBD_SNAP="cpds-${VM_ID}-${DISK_ID}-$( date +%s )"
> +
> +CP_CMD=$(
> +cat <<EOF
> +set -e
> +
> +RBD_FORMAT=\$($RBD info $RBD_DST | sed -n 's/.*format: // p')
> +if [ "\$RBD_FORMAT" = "2" ]; then
> +    $RBD snap create "$RBD_DST@$RBD_SNAP"
> +    $RBD snap protect "$RBD_DST@$RBD_SNAP"
> +    $RBD clone "$RBD_DST@$RBD_SNAP" $DST
> +    $RBD flatten $DST
> +    $RBD snap unprotect "$RBD_DST@$RBD_SNAP"
> +    $RBD snap rm "$RBD_DST@$RBD_SNAP"
> +else
> +    $RBD copy $RBD_DST $DST
> +fi
> +EOF
> +)
>
> -ssh_exec_and_log "$SRC_HOST" "$RBD copy $RBD_DST $DST" \
> +ssh_exec_and_log "$SRC_HOST" "$CP_CMD" \
>                   "Error cloning $RBD_DST to $DST in $SRC_HOST"
>
>  exit 0
> --
>
> I will create a feature-request if "rbd cp" isn't using an internal
> snapshot.
>
> Fabian
>
>
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