Matthew Rudy Jacobs
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Thought Sauce
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Upgrading Postgres 8.4 to 9.0 with Homebrew

I hoped it’d be as simple as a `brew install postgresql`

And it almost was.


RudiMac:merlot matthew$ tail -f /usr/local/var/postgres/server.log
FATAL:  database files are incompatible with server
DETAIL:  The data directory was initialized by PostgreSQL version 8.4, which is not compatible with this version 9.0.3.

How do I fix the data files?

Turns out there is a `pg_update` method to do this for you.

But it requires a bit of manual work.

# First of all stop the server
launchctl unload -w ~/Library/LaunchAgents/org.postgresql.postgres.plist

# backup the old data directory
mv /usr/local/var/postgres /usr/local/var/postgres.old

# now create a fresh postgres 9 data directory
initdb /usr/local/var/postgres

Now we’re ready to do the upgrade.

pg_upgrade -d /usr/local/var/postgres.844/ -D /usr/local/var/postgres -b /usr/local/Cellar/postgresql/8.4.4/bin -B /usr/local/Cellar/postgresql/9.0.3/bin
Upgrade complete

Boom Ting

Now just add the launch control back in and we’re off.

cp /usr/local/Cellar/postgresql/9.0.3/org.postgresql.postgres.plist ~/Library/LaunchAgents
launchctl load -w ~/Library/LaunchAgents/org.postgresql.postgres.plist