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Add description on external master support to documentation

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Esa Korhonen 2018-02-09 14:30:33 +02:00
parent 2bd1d4ab88
commit eeb3fa65ae
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Documentation/Monitors/MariaDB-Monitor.md
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@ -318,6 +318,26 @@ moment the rejoining server lost connection, the rejoining server cannot
continue replication. This is an issue if the master has changed and
the new master does not have *log_slave_updates* on.
### External master support
The monitor detects if a server in the cluster is replicating from an external
master (a server that is not monitored by the monitor). If the replicating
server is the cluster master server, then the cluster itself is considered to
have an external master.
If a failover/switchover happens, the new master server is set to replicate from
the cluster external master server. The usename and password for the replication
are defined in `replication_user` and `replication_password`. The address and
port used are the ones shown by `SHOW ALL SLAVES STATUS` on the old cluster
master server. In the case of switchover, the old master also stops replicating
from the external server to preserve the topology.
After failover the new master is replicating from the external master. If the
failed old master comes back online, it is also replicating from the external
server. To normalize the situation, either have *auto_rejoin* on or manually
execute a rejoin. This will redirect the old master to the current cluster
master.
### Configuration parameters
#### `auto_failover`