host-backup

#!/bin/bash
#
# Copyright (c) Citrix Systems 2008. All rights reserved.
#
# Experimental backup script

# NB if this script returns non-zero then the host-backup CLI command will fail.

# Create a backup of the pool-database.  This is needed because the state in memory
# is not guarranteed to be flushed to disk.

DATE=$(date +%F--%k-%M-%S)
POOL_DB_BACKUP=/var/backup/pool-database-${DATE}
[ -e ${POOL_DB_BACKUP} ] && rm -f ${POOL_DB_BACKUP}
mkdir -p $(dirname ${POOL_DB_BACKUP})
xe pool-dump-database file-name=${POOL_DB_BACKUP}

# Exclude everything under /tmp (as it is temporary) and everything under /var/crash
# (as it might contain large sparse files).  The directories themselves still need to
# exist, however, for xapi to function correctly.

tar --exclude 'tmp/*' --exclude 'tmp/.*' --exclude 'var/crash/*' --exclude 'var/crash/.*' \
    --exclude 'var/log/audit*' \
    --exclude 'var/xsconfig/*' --exclude 'var/xsconfig/.*' \
    --exclude 'var/xapi/[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*-[0-9a-f]*' \
    --sparse --preserve-permissions --to-stdout --gzip --one-file-system -C / -c . 

# Remove the backup of the pool-database.  We only need it to be present in the tar file.
# During restore the tar file is extracted over the backup partition which is then made
# bootable.  Following a reboot the user must manually call "xe pool-restore-database" on 
# the pool-database backup file.

rm -f ${POOL_DB_BACKUP}