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what will be primary machine fail of postgresql replication

I am new at postgresql replication and reading documentations. I looked some replication tutorials. There is one primary machine and multiple stand by machines.

what will be if primary machine fails? Can I convert stand by machines to primary machine?
if stand by machines fails, will system gives error? (for example database errors because of connection error.)

I need some fail scenarios answer.

over 4 years ago · Santiago Trujillo

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Answer 1 · 2022-05-26T12:58:48.759Z

if primary machine fails slaves won't be able to get replication from master. To promote slave a new master, run pg_ctl promote ont it or just create a trigger file. If other slaves were configured to stream from this one (cascaded replication) you will have to define latest timeline in recovery.conf.
if postgres dies on slave, usually you have reason for it in postgres.log. If you ask if master will notice death of any of slaves - no.

If you want some tools, check https://github.com/2ndQuadrant/repmgr

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what will be primary machine fail of postgresql replication

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