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PostgreSQL BFM is a HA service that has automatic failover and switchover properties. A typical PostgreSQL Cluster has a master server and standby servers of the master server. In case of a failure on the master server, one of the standby servers should take the role of the master server by a failover mechanism. When the ex-master PostgreSQL service is online, it will rejoin to cluster as a standby server. In the BFM logic, the master server has a VIP (Virtual IP) and during the failover process, this VIP is transferred to the new master server.

VIP - Virtual IP

• Is active only on the master server
• All the clients are connected via this VIP
• Is transferred to the ex-standby new-master server during the failover or switchover process

BFM Instance

• Regularly checks all nodes in the cluster
• In case of any service failure, it coordinates any necessary operations on the database servers
• There should be only one active BFM instance, but there can be more than one BFM instance.

Minipg

• It performs any operating system level actions sent by the BFM such as
• • Service start-stop operations
• • Rewind operations
• • VIP operations
• Runs a separate service on all PostgreSQL servers.

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