Upgrading Postgres Database to 9.1 Format After Upgrading to Fedora 16

After upgrading from Fedora 15 to Fedora 16, I noticed Postgres was no longer running, so I tried to start it up:

sudo systemctl status postgresql.service

This printed the error "Job failed. See system logs and 'systemctl status' for details." Inspecting /var/log/messages revealed:

Feb 29 12:51:39 jetengine postgresql-check-db-dir[4912]: An old version of the database format was found.
Feb 29 12:51:39 jetengine postgresql-check-db-dir[4912]: Use "postgresql-setup upgrade" to upgrade to version 9.1.
Feb 29 12:51:39 jetengine postgresql-check-db-dir[4912]: See /usr/share/doc/postgresql-9.1.2/README.rpm-dist for more information.
Feb 29 12:51:39 jetengine systemd[1]: postgresql.service: control process exited, code=exited status=1
Feb 29 12:51:39 jetengine systemd[1]: Unit postgresql.service entered failed state.

So I needed to upgrade to the new 9.1 format. I used the following command to check the current version of my database:

sudo cat /var/lib/pgsql/data/PG_VERSION

This returned "9.0".

To upgrade the database, I first needed to install the postgresql-upgrade package:

sudo yum install -y postgresql-upgrade

I then ran the following command to update the database:

sudo postgresql-setup upgrade

This command took a minute or two to complete. Once it was done, the database at /var/lib/pgsql/data/ was in 9.1 format, and the old 9.0 format database was saved to /var/lib/pgsql/data-old/ However, the upgrade tool did not copy over my old pg_hba.conf, so I had to do that myself:

sudo mv /var/lib/pgsql/data-old/pg_hba.conf  /var/lib/pgsql/data/pg_hba.conf

Now I was able to successfully start up Postgres 9.1:

sudo systemctl start postgresql.service