> > > > but how to find out what is this "cluster-name" for pg_ctlcluster, > > > > pg_dropcluster and pg_upgradecluster ? > > > > > > OK from the conf files assume cluster-name is '10/main' and '11/main' > > > respectively ? > > > > default cluster name for both clusters should be "main". > yes I got there eventually
You could also try reading the README.Debian.gz file in /usr/share/doc/postgresql-*/ In stretch, this is /usr/share/doc/postgresql-9.6/README.Debian.gz and it contains the exact steps needed to upgrade from 9.1 to 9.4. Just replace the version numbers with whatever you have.
