diff options
| -rw-r--r-- | f3s/freebsd-hosts/carp/carpcontrol.sh | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/f3s/freebsd-hosts/carp/carpcontrol.sh b/f3s/freebsd-hosts/carp/carpcontrol.sh index 6caa447..527699b 100644 --- a/f3s/freebsd-hosts/carp/carpcontrol.sh +++ b/f3s/freebsd-hosts/carp/carpcontrol.sh @@ -44,10 +44,21 @@ case "$2" in service nfsd stop >/dev/null 2>&1 service mountd stop >/dev/null 2>&1 service nfsuserd stop >/dev/null 2>&1 - # Restore readonly=on on the sink dataset so that zrepl can resume - # writing incoming snapshot data from f0. + # Restore the sink dataset for zrepl replication from f0. + # Any writes made while MASTER must be rolled back to the last + # received snapshot; otherwise zfs receive fails with "destination + # has been modified since most recent snapshot". Data written + # during the MASTER window is transient (health checks, test writes) + # and is intentionally discarded here. if [ "$HOSTNAME" != 'f0.lan.buetow.org' ]; then - zfs set readonly=on zdata/sink/f0/zdata/enc/nfsdata + SINK="zdata/sink/f0/zdata/enc/nfsdata" + LAST_SNAP=$(zfs list -t snapshot -Ho name "$SINK" 2>/dev/null | tail -1) + if [ -n "$LAST_SNAP" ]; then + zfs rollback "$LAST_SNAP" && \ + logger "CARP BACKUP: rolled back $SINK to $LAST_SNAP" || \ + logger "CARP BACKUP: WARNING rollback of $SINK to $LAST_SNAP failed" + fi + zfs set readonly=on "$SINK" fi logger "CARP BACKUP: NFS and stunnel services stopped" ;; |