One thing I found right away is the Yosemite upgrade killed my installed Postgres. I think Apple’s upgrade process did a search for certain postgres folders (for temporary files, no data files are deleted) and deleted them, probably assuming they were for their Postgres and that they would be reconstructed later in the upgrade process. I added some repair instructions on my Postgres page.
“The beast is actively interested only in now, and, as it is always now and always shall be, there is an eternity of time for the accomplishment of objects.” – the wisdom of Tarzan