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The PostgreSQL version 9.5 is obsolete, but the server or client packages are still installed.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
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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!