pgauto - An Overview
pgauto - An Overview
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By default, after you incorporate a next standby that participates while in the replication quorum then pg_auto_failover increments its number-sync-standbys from zero to 1 to ensure that in its place, Whenever your Most important node is the sole a person left, then all transactions which have been creating facts are put on-maintain till a standby node is on the market again.
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But Let's say we shed each of our standby nodes? Very well, that would protect against our HA system to operate appropriately. If both of those standbys are misplaced, a number of you may need Postgres to accept writes, and a few of you will want Postgres to refuse writes simply because you can’t settle for the chance that comes with preserving an individual duplicate within your production information.
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If you Do that command, then when your setup is jogging (it usually can take from 30s as much as a couple of moment on my laptop), Then you can certainly apply your initially Postgres totally automatic failover using pg_auto_failover:
Take note: When creating the occasion, ensure that the $PGDATA directory isn't a mount level, and that it may be recreated and deleted through the pg_autofailover consumer and Postgres.
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A pre-arranged maintenance window to perform the migration. Throughout that time period, cease any consumer entry to the VMware Postgres Patroni cluster, to prevent any information modification.
Login to the secondary node, which would not comprise any database data files and is not initialized, and increase it on the development, much like:
Postgres is excellent at waiting, and very affected person: When the standby node turns into unavailable, then the consumer link stays on-maintain for an infinite length of time (or not less than until a restart).
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