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running pg_dumpall makes a backup of the cluster "main", but I have another cluster "custom". How do I make pg_dumpall produce a backup of "custom"?

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up vote 3 down vote accepted

Every cluster is served by a different Postgres instance, listening on different port and/or using different unix domain socket (if there are different instances running on one machine).

So you need to pass different value for the port:

-p port
--port=port

    Specifies the TCP port or local Unix domain socket file extension on which the server is listening for connections. Defaults to the PGPORT environment variable, if set, or a compiled-in default.
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The default value of the port for a given cluster can be found in the postgresql.conf file in the cluster folder. –  tjb May 3 '12 at 7:49
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