Homebrew postgres broken

Question

I installed Postgresql 9.4.0 installed on my Mac (10.10.1/Yosemite) using homebrew. It does not work.

I have created the softlink to /usr/local/opt/postgresql/homebr

Answer 1

For posterity, I had this issue and wanted to note what worked for me.

I am running postgres 11.2 on High Sierra. I had recently upgraded from postgres 10 with brew postgresql-upgrade-database.

I kept getting the error psql: could not connect to server: No such file or directory, and my server.log indicated is another postmaster (PID 5894) running in data directory "/usr/local/var/postgres"?

I tried several solutions including restarting my computer, deleting postmaster.pid, using brew services restart postgres, but to no avail. I eventually stumbled on the solution:

brew unlink postgresql && brew link postgresql

No idea why this worked, but putting it here mostly so I can reference it myself in the future! Throw stuff at the wall till it sticks!

Answer 2

I recently had a problem which began when I upgraded some brew updates / upgrades, mainly python versions etc. What worked for me.

brew uninstall postgres
brew install postgresql@9.5
echo 'export PATH="/usr/local/opt/postgresql@9.5/bin:$PATH"' > ~/.zshrc
# you may need > ~/.bashrc if you use bash

I needed pg_dump, pg_restore etc so to get that working I did

brew install libpq

Start the service

brew services start postgresql@9.5

From here I would have expected everything to work but still all rails db commands were giving error that server was not running. This final bit was the missing piece of the puzzle which finally solved it for me.

gem uninstall pg
gem install pg -v 0.20.0 # which was set in Gemfile
# could also just probably do bundle install instead.