Upgrade PostgreSQL 9.5.5 to 9.6.1 using Homebrew (macOS)

gistfile1.txt

After automatically updating Postgres to 9.6.1 via Homebrew, the pg_ctl start command didn't work.
The error was something like "database files are incompatible with server".

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.1 and latest 9.5.x installed, and keep 9.6.1 as default
brew unlink postgresql
brew install postgresql95
brew unlink postgresql95
brew link postgresql

# move 9.5.x db files to another directory
mv /usr/local/var/postgres /usr/local/var/postgres95

# init new database using 9.6.1
initdb /usr/local/var/postgres -E utf8

# make timezonesets directory available for 9.5.x installation
mkdir /usr/local/share/postgresql95
cp -r /usr/local/share/postgresql/timezonesets /usr/local/share/postgresql95

# finally the actual upgrade
# -b is the old binary dir, -B is the new binary dir
# -d is the old data dir, -D is the new data dir
pg_upgrade -b /usr/local/Cellar/postgresql95/9.5.5/bin -B /usr/local/Cellar/postgresql/9.6.1/bin -d /usr/local/var/postgres95 -D /usr/local/var/postgres

# start 9.6.1 to check that upgrade works
pg_ctl start -D /usr/local/var/postgres

# cleanup if upgrade was successful
brew uninstall postgresql95
rm -rf /usr/local/var/postgres95
rm -rf /usr/local/share/postgresql95

@giannisp Thanks for posting this! One other thing I had to do was copy over the timezone directory: cp -r /usr/local/share/postgresql/timezone /usr/local/share/postgresql95.

Thank you @giannisp for this gist. FYI, I had to copy over the timezone dir as well, just like @golmansax mentioned.

Thank you very much, this issue was driving me crazy.

Thank you, worked like a charm for me.

Version 10.0 has just been released today, so here is an updated gist for 9.6.5 => 10.0 migration:
https://gist.github.com/giannisp/ebaca117ac9e44231421f04e7796d5ca