Configuring the CTDB recovery lock

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Goal

Configure CTDB to use a recovery lock to avoid a "split-brain" situation.

Prerequisites

CTDB configuration

The recovery lock, configured via the recovery lock option in the cluster section, provides important split-brain prevention and is usually configured to point to a lock file in the cluster filesystem. See the RECOVERY LOCK section in ctdb(7) for more details.

For example: 

 [cluster]
   recovery lock = /clusterfs/.ctdb/reclock

Samba ≤ 4.8

The equivalent ctdbd.conf option is CTDB_RECOVERY_LOCK. For example: 

 CTDB_RECOVERY_LOCK=/clusterfs/.ctdb/reclock
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