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PostgreSQL upgrade

Standing on the shoulders of the other poor creatures trodding through this muck, I was able to follow these steps to get back up and running after an upgrade to Yosemite:
Assuming you've used home-brew to install and upgrade Postgres, you can perform the following steps.
  1. Stop current Postgres server:
    launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
  2. Initialize a new 9.4 database:
    initdb /usr/local/var/postgres9.4 -E utf8
  3. Install postgres 9.3 (as it was no longer present on my machine):
    brew install homebrew/versions/postgresql93
  4. Add directories removed during Yosemite upgrade:
    mkdir -p /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/touch /usr/local/var/postgres/{pg_tblspc,pg_twophase,pg_stat_tmp}/.keep
  5. run pg_upgrade:
    pg_upgrade -v -d /usr/local/var/postgres -D /usr/local/var/postgres9.4 -b /usr/local/Cellar/postgresql93/9.3.5/bin/ -B /usr/local/Cellar/postgresql/9.4.0/bin/
  6. Move new data into place:
    cd /usr/local/var
    mv postgres postgres9.3
    mv postgres9.4 postgres
  7. Restart Postgres:
    launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
  8. Check /usr/local/var/postgres/server.log for details and to make sure the new server started properly.
  9. Finally, re-install related libraries?
    pip install --upgrade psycopg2
    gem uninstall pg
    gem install pg

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