Detecting master/slave

Hey steve ,

You can by using grep command
Ps -ewf | grep PostgreSQL

If you find sender process is running that will be master if you will see
receiver process then that will be slave
In addition to this you can also use Edb fail over manager for more status

Steve Pribyl schrieb am 21.11.2014 um 15:13:

Is there a better/recommended way to determine which host in a
cluster is the master or slave besides rescue.conf or
pg_stat_replication?

Just looking for the "right" way to know which
host is which.

What about

select pg_is_in_recovery()

should return true on the slave and false on the master.

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On 21 Nov 2014 22:14, "Steve Pribyl" <Steve.Pribyl@akunacapital.com> wrote:

Is there a better/recommended way to determine which host in a cluster is

the master or slave besides rescue.conf or pg_stat_replication? Just
looking for the "right" way to know which host is which.

You may query

select pg_is_in_recovery();

This will be true in hosts which are currently in recovery mode i.e.
standby. It will be false for master.

As suggested previously you may check the wal sender process too but if you
have a cascaded setup you may find these processes on a standby which is
replicating to a cascaded standby.

Thanks

Steve
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