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zfsync.sh: send incremental zfs snapshots to another server

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n 2014-09-14 00:36:27 +02:00
parent bd67510ceb
commit 2134b66df9
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zfsync.sh Executable file
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#!/bin/sh
# zfsync: sync zfs pool(s) between two servers
# in case of failure, unepexpected reboot while syncing, etc.:
# - destroy all snapshots on both local & ${bro}
# - for i in ftp web mail; do zfs send servers/$i/home@newsync | ssh ${bro} zfs receive -vFd servers ;done
# - for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done
# - ssh ${bro} "for i in ftp web mail; do zfs rename servers/$i/home@newsync servers/$i/home@prevsync ;done"
bro="small"
pools="ftp mail web"
SENDNSCA=/usr/local/sbin/send_nsca\ -H\ 192.168.3.3\ -d\ ';;'\ -c\ /usr/local/etc/nagios/send_nsca.cfg
HOSTNAME=`/bin/hostname -f | /usr/bin/cut -d '.' -f 1,1`
SERVICENAME=zfsync
LOGFILE=/tmp/zfsync.log
sync_success=1
alert()
{
echo "${HOSTNAME};;${SERVICENAME};;2;CRITICAL - ZFS Sync failed at `date`, please check ${LOGFILE} for complete report." | ${SENDNSCA} >/dev/null
exit $?
}
if [ $1 ]
then
if [ $1 = "init" ]
then
echo "`date`: ZFSync INIT starting."
echo "wiping previous syncs"
for snapshot in `zfs list -t snapshot -o name | grep -e prevsync -e newsync`; do zfs destroy $snapshot ; done
ssh -q ${bro} 'for snapshot in `zfs list -t snapshot -o name | grep -e prevsync -e newsync`; do zfs destroy $snapshot ; done'
echo "making full snapshots"
for jail in $pools; do zfs snapshot servers/$jail/home@newsync;done
echo "sending full snapshots"
for jail in $pools; do zfs send servers/$jail/home@newsync | ssh -q ${bro} 'zfs receive -vFd servers' ;done
echo "renaming them to use them as a base for diff snapshots"
for jail in $pools; do zfs rename servers/$jail/home@newsync servers/$jail/home@prevsync ;done
ssh -q ${bro} 'for jail in ftp mail web; do zfs rename servers/$jail/home@newsync servers/$jail/home@prevsync ;done'
exit $?
fi
fi
echo "`date`: ZFSync starting."
for pool in $pools
do
dataset="servers/${pool}/home"
echo "making new snapshot for ${pool}"
zfs snapshot ${dataset}@newsync || alert
echo "sending snapshot"
zfs send -i prevsync ${dataset}@newsync | ssh -q ${bro} "zfs receive -vFd servers" || alert
echo "cleaning"
zfs destroy ${dataset}@prevsync || alert
zfs rename ${dataset}@newsync ${dataset}@prevsync || alert
ssh -q ${bro} "zfs destroy ${dataset}@prevsync && zfs rename ${dataset}@newsync ${dataset}@prevsync" || alert
done
echo
echo "${HOSTNAME};;${SERVICENAME};;0;OK - ZFS Sync succeeded at `date`" | ${SENDNSCA} >/dev/null