From: | "Peter J(dot) Holzer" <hjp-pgsql(at)hjp(dot)at> |
---|---|
To: | pgsql-general(at)lists(dot)postgresql(dot)org |
Subject: | Re: PostgreSQL Replication |
Date: | 2021-02-19 17:35:45 |
Message-ID: | 20210219173545.GF10464@hjp.at |
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Thread: | |
Lists: | pgsql-general |
On 2021-02-17 12:22:50 +0300, Mutuku Ndeti wrote:
> I agree with you. Single master, with a standby replica, seems easier to
> manage. Is there a way to automatically promote the standby, when the active
> master fails?
Yes. There are several solutions. We use Patroni, which is simple to set
up and seems to "just work" (we routinely cause a failover every few
weeks and so far it has always worked fine). Patroni is quite
postgres-specific, though, so if you want to manage other applications,
too, you may want to look into more generic solutions.
> Is it feasible to have 2 instances of the application, writing onto
> the same DB, reason for two instances of the application is to allow
> for redundancy/load balancing.
You can have any number of applications writing into the same database.
At some point you might exceed the capacity of your hardware, but that's
a function of load in general, not the number of applications.
hp
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_ | Peter J. Holzer | Story must make more sense than reality.
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| | | hjp(at)hjp(dot)at | -- Charles Stross, "Creative writing
__/ | http://www.hjp.at/ | challenge!"
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