pgauto for Dummies
pgauto for Dummies
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If $PGDATA is really a mountpoint for a filesystem, modify it to be a directory within the mounted filesystem. Such as: if a filesystem is mounted to /var/lib/psql/information and $PGDATA is about to /var/lib/pgsql/knowledge, improve $PGDATA to /var/lib/pgsql/facts/details.
By default, after you increase a 2nd standby that participates inside the replication quorum then pg_auto_failover increments its quantity-sync-standbys from zero to at least one so that as an alternative, Whenever your Principal node is the one just one still left, then all transactions that happen to be producing facts are placed on-maintain until eventually a standby node is out there once more.
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Here's what occurs inside of a scenario with only one standby node exactly where your HA Alternative employs synchronous_commit to shield your info:
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It ought to be obvious now that it is difficult to achieve provider and details availability with Postgres when applying a single standby node. With an individual standby the most beneficial we will reach is failover when the primary just isn't obtainable, and solitary-node Postgres in the event the standby is not obtainable.
In this particular classic Postgres HA architecture (as thorough in our docs while in the Architectures with two standby nodes portion and created possible by pg_auto_failover a number of standby aid), we will afford to pay for to lose considered one of our standby nodes and carry on to just accept writes to the first with synchronous_commit on, since we however Have got a functioning standby that could acquire and replay all of the transactions dedicated on the key.
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