man pg_upgradecluster (Administration système) - upgrade a new PostgreSQL cluster to a new major version.
NAME
pg_upgradecluster - upgrade a new PostgreSQL cluster to a new major version.
SYNOPSIS
pg_upgradecluster [-v newversion] version name [data dir]
DESCRIPTION
pg_upgradecluster upgrades an existing PostgreSQL server cluster (i. e. a collection of databases served by a postmaster instance) to a new version specified by newversion (default: latest available version). The configuration files of the old version are copied to the new cluster.
The cluster of the old version will be configured to use a previously unused port since the upgraded one will use the original port. The old cluster is not automatically be removed. After upgrade, please verify that the new cluster indeed works as expected; if so, you should remove the old cluster with pg_dropcluster(8).
SEE ALSO
AUTHOR
Martin Pitt <mpitt@debian.org>