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
--
_ | Peter J. Holzer | Story must make more sense than reality.
|_|_) | |
| | | hjp@hjp.at | -- Charles Stross, "Creative writing
__/ | http://www.hjp.at/ | challenge!"