The Definitive Guide to pgauto
The Definitive Guide to pgauto
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If $PGDATA is really a mountpoint for just a filesystem, adjust it to generally be a directory from the mounted filesystem. For instance: if a filesystem is mounted to /var/lib/psql/data and $PGDATA is about to /var/lib/pgsql/data, modify $PGDATA to /var/lib/pgsql/facts/data.
By default, whenever you increase a second standby that participates within the replication quorum then pg_auto_failover increments its number-sync-standbys from zero to one to make sure that instead, Whenever your Principal node is the sole 1 remaining, then all transactions which might be producing info are put on-keep until a standby node is offered once more.
Applying synchronous_commit for each transaction that Postgres commits regionally, the customer connection is placed on maintain until eventually the dedicate is understood to have created it into the standby node.
But Let's say we lost both equally of our standby nodes? Properly, that would reduce our HA procedure to function correctly. If both of those standbys are dropped, some of you may need Postgres to just accept writes, plus some of you will require Postgres to refuse writes because you can’t acknowledge the risk that includes sustaining one copy of your respective manufacturing facts.
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That’s why pg_auto_failover switches synchronous_commit off if the only identified standby node is unavailable, and signals the at this time waiting around transactions. That’s a great implementation of the Idea of a graceful degradation
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Login to the secondary node, which won't incorporate any database documents and is not initialized, and increase it on the formation, comparable to:
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