XenServer - Automation Metdata backups

Tue, 05 Jun 2012 18:59:48 +0000

Well, we had some issues with XenServers “automated” metadata backup, so I decided - with the help of one of our consultants - to automate it on our own to an external target.

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#!/bin/bash

# Crontab entry for each server:
# 02 5 * * * root /usr/local/sbin/xen-pool-backup.sh

# Get the pool name
POOL_NAME="$( xe pool-list | grep name-label | awk '{ print $4 }' )"
HOST_UUID="$( xe host-list hostname=`hostname` | grep "uuid ( RO)" |
 awk '{ print $5 }' )"

DAILY_GENERATIONS=7
WEEKLY_GENERATIONS=4

NFS_MOUNT="nfs.home.barfoo.org:/srv/xenbackup"
NFS_LOCAL="/tmp/backup-mount/$POOL_NAME"

# Figure out if we're the pool master
POOL_MASTER="$( xe pool-list | grep master | awk '{ print $4 }' )"

if [ "$POOL_MASTER" == "$HOST_UUID" ] ; then
 # Only the pool master should backup the pool database, as this is the only
 # one who has a authoritive pool database

 # Create the necessary directory and mount the NFS volume
 mkdir -p ${NFS_LOCAL%/*}
 mount -t nfs $NFS_MOUNT ${NFS_LOCAL%/*}
 mkdir -p $NFS_LOCAL

 if [ -f $NFS_LOCAL/daily.$DAILY_GENERATIONS.gz ]; then
 rm -f $NFS_LOCAL/daily.$DAILY_GENERATIONS.gz
 fi

 OLD_DAILY="$( echo "scale=0; $DAILY_GENERATIONS - 1" | bc )"

 for OLD in $( seq $OLD_DAILY -1 1 ); do
 if [ -f $NFS_LOCAL/daily.$OLD.gz ] ; then
 NEW="$( echo "scale=0; $OLD+1" | bc )"

 # Save the time stamp somewhere
 touch $NFS_LOCAL/.timestamp -r $NFS_LOCAL/daily.$OLD.gz
 mv $NFS_LOCAL/daily.$OLD.gz $NFS_LOCAL/daily.$NEW.gz

 # Restore the date
 touch $NFS_LOCAL/daily.$NEW.gz -r $NFS_LOCAL/.timestamp
 fi
 done

 [ -f $NFS_LOCAL/daily.0.gz ] && mv $NFS_LOCAL/daily.0.gz
 $NFS_LOCAL/daily.1.gz
 xe pool-dump-database file-name=$NFS_LOCAL/daily.0
 gzip -9 $NFS_LOCAL/daily.0

 [ -f $NFS_LOCAL/.timestamp ] && rm $NFS_LOCAL/.timestamp
 umount ${NFS_LOCAL%/*}

 rm -rf ${NFS_LOCAL%/*}
fi

With that, I have at least a daily backup - and in combination with our daily TSM backup, I have at least month long history of metadata backups.

Metadata on BAFM

XenServer - Automation Metdata backups