How-To guide to upgrade PostgreSQL from 9.6 to 10.0 on Ubuntu after upgrade it to 18.04 version.
TL;DR
After upgrade to Ubuntu 18.04:
$ sudo pg_dropcluster 10.0 main --stop
$ sudo pg_upgradecluster 9.6 main
$ sudo pg_dropcluster 9.6 main
Upgrade PostgreSQL
During Ubuntu updgrade to 18.04 you receive this message "Configuring postgresql-common":
Obsolete major version 9.6
The PostgreSQL version 9.6 is obsolete, but the server or client packages are still installed.
Please install the latest packages (postgresql-10 and postgresql-client-10) and upgrade the existing clusters with pg_upgradecluster (see manpage).Please be aware that the installation of postgresql-10 will automatically create a default cluster 10.0/main.
If you want to upgrade the 9.6/main cluster, you need to remove the already existing 10 cluster (pg_dropcluster --stop 10 main, see manpage for details).The old server and client packages are no longer supported.
After the existing clusters are upgraded, the postgresql-9.6 and postgresql-client-9.6 packages should be removed.Please see /usr/share/doc/postgresql-common/README.Debian.gz for details.
Use dpkg -l | grep postgresql to check which versions of postgres are installed:
ii postgresql 10+190 all object-relational SQL database (supported version)
ii postgresql-10 10.3-1 amd64 object-relational SQL database, version 10 server
ii postgresql-10-postgis-2.4 2.4.3+dfsg-4 amd64 Geographic objects support for PostgreSQL 10
ii postgresql-10-postgis-2.4-scripts 2.4.3+dfsg-4 all Geographic objects support for PostgreSQL 10 -- SQL scripts
ii postgresql-9.6 9.6.8-0ubuntu0.17.10 amd64 object-relational SQL database, version 9.6 server
ii postgresql-9.6-postgis-2.3 2.3.3+dfsg-1 amd64 Geographic objects support for PostgreSQL 9.6
ii postgresql-client 10+190 all front-end programs for PostgreSQL (supported version)
ii postgresql-client-10 10.3-1 amd64 front-end programs for PostgreSQL 10
ii postgresql-client-9.6 9.6.8-0ubuntu0.17.10 amd64 front-end programs for PostgreSQL 9.6
ii postgresql-client-common 190 all manager for multiple PostgreSQL client versions
ii postgresql-common 190 all PostgreSQL database-cluster manager
ii postgresql-contrib 10+190 all additional facilities for PostgreSQL (supported version)
ii postgresql-contrib-9.6 9.6.8-0ubuntu0.17.10 amd64 additional facilities for PostgreSQL
ii postgresql-plpython3-9.6 9.6.8-0ubuntu0.17.10 amd64 PL/Python 3 procedural language for PostgreSQL 9.6
Run pg_lsclusters, your 9.6 and 10 main clusters should be "online".
Ver Cluster Port Status Owner Data directory Log file
9.6 main 5432 down postgres /var/lib/postgresql/9.6/main pg_log/postgresql-%Y-%m-%d.log
10 main 5433 down postgres /var/lib/postgresql/10/main /var/log/postgresql/postgresql-10-main.log
There already is a cluster "main" for 10 (since this is created by default on package installation). This is done so that a fresh installation works out of the box without the need to create a cluster first, but of course it clashes when you try to upgrade 9.6/main when 10/main also exists. The recommended procedure is to remove the 10 cluster with pg_dropcluster and then upgrade with pg_upgradecluster.
Stop the 10 cluster and drop it.
$ sudo pg_dropcluster 10 main --stop
Upgrade the 9.6 cluster to the latest version.
$ sudo pg_upgradecluster 9.6 main
Your 9.6 cluster should now be "down" and you can verifity running pg_lsclusters
Ver Cluster Port Status Owner Data directory Log file
9.6 main 5433 down postgres /var/lib/postgresql/9.6/main ...
10 main 5432 online postgres /var/lib/postgresql/10/main ...
Check that the upgraded cluster works, then remove the 9.6 cluster.
$ sudo pg_dropcluster 9.6 main
After all your data check you can remove your old packages.
$ sudo apt purge postgresql-9.6 postgresql-client-9.6 postgresql-contrib-9.6
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Reference
Originially published on www.paulox.net
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