Howto upgrade PostgreSQL from 9.5 to 9.6 after upgrade to Ubuntu 17.04
TL;DR
After upgrade to Ubuntu 17.04:
sudo pg_dropcluster 9.6 main --stop
sudo pg_upgradecluster 9.5 main
sudo pg_dropcluster 9.5 main
Upgrade PostgreSQL
During Ubuntu updgrade to 17.04 you receive this message "Configuring postgresql-common":
Obsolete major version 9.5
The PostgreSQL version 9.5 is obsolete, but the server or client packages are still installed.
Please install the latest packages (postgresql-9.6 and postgresql-client-9.6) and
upgrade the existing clusters with pg_upgradecluster (see manpage).
Please be aware that the installation of postgresql-9.6 will automatically create a default cluster 9.6/main.
If you want to upgrade the 9.5/main cluster, you need to remove the already existing 9.6 cluster
(pg_dropcluster --stop 9.6 main, see manpage for details).
The old server and client packages are no longer supported.
After the existing clusters are upgraded, the postgresql-9.5 and postgresql-client-9.5 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 9.6+179 all object-relational SQL database (supported version)
ii postgresql-9.5 9.5.6-0ubuntu0.16.10 amd64 object-relational SQL database, version 9.5 server
ii postgresql-9.6 9.6.2-1 amd64 object-relational SQL database, version 9.6 server
ii postgresql-client 9.6+179 all front-end programs for PostgreSQL (supported version)
ii postgresql-client-9.5 9.5.6-0ubuntu0.16.10 amd64 front-end programs for PostgreSQL 9.5
ii postgresql-client-9.6 9.6.2-1 amd64 front-end programs for PostgreSQL 9.6
ii postgresql-client-common 179 all manager for multiple PostgreSQL client versions
ii postgresql-common 179 all PostgreSQL database-cluster manager
ii postgresql-contrib-9.5 9.5.6-0ubuntu0.16.10 amd64 additional facilities for PostgreSQL
ii postgresql-contrib-9.6 9.6.2-1 amd64 additional facilities for PostgreSQL
Run pg_lsclusters, your 9.5 and 9.6 main clusters should be "online".
Ver Cluster Port Status Owner Data directory Log file
9.5 main 5433 online postgres /var/lib/postgresql/9.5/main /var/log/postgresql/postgresql-9.5-main.log
9.6 main 5432 online postgres /var/lib/postgresql/9.6/main /var/log/postgresql/postgresql-9.6-main.log
There already is a cluster "main" for 9.6 (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 9.5/main when 9.6/main also exists.
The recommended procedure is to remove the 9.6 cluster with pg_dropcluster and then upgrade with pg_upgradecluster.
Stop the 9.6 cluster and drop it.
sudo pg_dropcluster 9.6 main --stop
Upgrade the 9.5 cluster to the latest version.
sudo pg_upgradecluster 9.5 main
Your 9.5 cluster should now be "down" and you can verifity running pg_lsclusters
Ver Cluster Port Status Owner Data directory Log file
9.5 main 5433 down postgres /var/lib/postgresql/9.5/main /var/log/postgresql/postgresql-9.5-main.log
9.6 main 5432 online postgres /var/lib/postgresql/9.6/main /var/log/postgresql/postgresql-9.6-main.log
Check that the upgraded cluster works, then remove the 9.5 cluster.
sudo pg_dropcluster 9.5 main
After all your data check you can remove your old packages.
sudo apt-get purge postgresql-9.5 postgresql-client-9.5 postgresql-contrib-9.5
Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
Reference
Originially published on gist.github.com/pauloxnet and www.paulox.net
Top comments (6)
Very Nice Article. I had previously gone through your article and upgraded the database from 9.5 to 10. But now I need to downgrade it to 9.5 or 9.6, is it possible to do?
If yes then can you please explain the steps.
Thanks
Very helpful, thanks !
You are welcome!
i have no words for u bro. thank u thank u thank u thank u thank u ,thanks a lotttttttttttttttttttttttttt :)
You're welcome
Awesome. Thank you!