diff options
| author | Paul Buetow <paul@buetow.org> | 2026-06-20 17:23:17 +0300 |
|---|---|---|
| committer | Paul Buetow <paul@buetow.org> | 2026-06-20 17:23:17 +0300 |
| commit | 6c13b6a253aec415b8ad850df4abfcecc8efbcd7 (patch) | |
| tree | 466fcea5a71bc17ed3f56213aa10d424ac5853d0 | |
| parent | 87d8b7b36c3528b7ad14e01ac0aec06df88d6ff3 (diff) | |
carp: flip sink dataset read-write on MASTER takeover, read-only on BACKUP
When f1 (BACKUP) becomes MASTER, its zrepl sink dataset
(zdata/sink/f0/zdata/enc/nfsdata) was kept readonly=on. NFS clients
could mount and read but all writes failed with EROFS. carpcontrol.sh
now sets readonly=off before starting NFS services on MASTER takeover,
and restores readonly=on before stopping them on BACKUP transition so
zrepl can resume receiving snapshots from f0.
Without this, every controlled CARP failover to f1 left NFS read-only
until manually fixed with `zfs set readonly=off`.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
| -rw-r--r-- | f3s/freebsd-hosts/carp/carpcontrol.sh | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/f3s/freebsd-hosts/carp/carpcontrol.sh b/f3s/freebsd-hosts/carp/carpcontrol.sh index 12f0c6b..6caa447 100644 --- a/f3s/freebsd-hosts/carp/carpcontrol.sh +++ b/f3s/freebsd-hosts/carp/carpcontrol.sh @@ -25,6 +25,12 @@ fi case "$2" in MASTER) logger "CARP state changed to MASTER, starting services" + # On the BACKUP host (f1), the sink dataset is kept readonly=on so + # zrepl can write incoming snapshots. On MASTER takeover we flip it + # read-write so NFS clients can write to it. + if [ "$HOSTNAME" != 'f0.lan.buetow.org' ]; then + zfs set readonly=off zdata/sink/f0/zdata/enc/nfsdata + fi service rpcbind start >/dev/null 2>&1 service mountd start >/dev/null 2>&1 service nfsd start >/dev/null 2>&1 @@ -38,6 +44,11 @@ case "$2" in service nfsd stop >/dev/null 2>&1 service mountd stop >/dev/null 2>&1 service nfsuserd stop >/dev/null 2>&1 + # Restore readonly=on on the sink dataset so that zrepl can resume + # writing incoming snapshot data from f0. + if [ "$HOSTNAME" != 'f0.lan.buetow.org' ]; then + zfs set readonly=on zdata/sink/f0/zdata/enc/nfsdata + fi logger "CARP BACKUP: NFS and stunnel services stopped" ;; *) |