The 2-Minute Rule for pgauto
The 2-Minute Rule for pgauto
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By default, any time you increase a next standby that participates in the replication quorum then pg_auto_failover increments its amount-sync-standbys from zero to 1 to ensure as a substitute, Once your Key node is the one one particular still left, then all transactions that happen to be writing information are put on-hold till a standby node is accessible once more.
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But Imagine if we shed the two of our standby nodes? Very well, that would avoid our HA process to work correctly. If both equally standbys are shed, a few of you will want Postgres to simply accept writes, plus some of you'll need Postgres to refuse writes since you can’t acknowledge the chance that comes along with maintaining an individual duplicate of your respective production data.
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Incorporate the new Main node to the HA development. Login to The brand new Principal host, and execute pg_autoctl develop postgres similar to:
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Getting automatic failover to one standby node in Postgres is a great and stable place to begin to acquire. Having said that, with one standby node for HA, our selections to carry out a
A pre-arranged servicing window to conduct the migration. During that period, cease any customer use of the VMware Postgres Patroni cluster, to stay away from any data modification.
With this context “details stability” means that after the standby node has grown to be unavailable, just one duplicate of the information is maintained, on one device. The degradation carried out by pg_auto_failover in that circumstance is graceful with regards to the services: writes are allowed to be processed once again.
Postgres is very good at ready, and very patient: If the standby node gets to be unavailable, then the client connection stays on-keep for an infinite time frame (or at least until a restart).
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