Erros in installing PostgreSQL using homebrew - macos

Question

I'm using Mac OS X 10.8.5 and trying to install postgreSQL using homebrew. I've fixed several errors and warnings which have occurred when I ran brew info postgresql. However, I don't know how to fix the rest of the problems.
$brew info postgresql
postgresql: stable 9.3.2 (bottled)
http://www.postgresql.org/
Conflicts with: postgres-xc
/usr/local/Cellar/postgresql/9.3.2 (2924 files, 40M) *
Poured from bottle
From: https://github.com/Homebrew/homebrew/commits/master/Library/Formula/postgresql.rb
==> Dependencies
Required: readline ✔
Recommended: ossp-uuid ✔
==> Options
--32-bit
Build 32-bit only
--enable-dtrace
Build with DTrace support
--no-perl
Build without Perl support
--no-tcl
Build without Tcl support
--without-ossp-uuid
Build without ossp-uuid support
--without-python
Build without python support
==> Caveats
If builds of PostgreSQL 9 are failing and you have version 8.x installed,
you may need to remove the previous version first. See:
https://github.com/Homebrew/homebrew/issues/issue/2510
To migrate existing data from a previous major version (pre-9.3) of PostgreSQL, see:
http://www.postgresql.org/docs/9.3/static/upgrading.html
When installing the postgres gem, including ARCHFLAGS is recommended:
ARCHFLAGS="-arch x86_64" gem install pg
To install gems without sudo, see the Homebrew wiki.
To have launchd start postgresql at login:
ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
Then to load postgresql now:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
Or, if you don't want/need launchctl, you can just run:
postgres -D /usr/local/var/postgres
When I run server, I get:
/usr/local/rvm/gems/ruby-2.0.0-p353/gems/activerecord-4.0.0/lib/active_record/connection_adapters/postgresql_adapter.rb:825:in `initialize': could not connect to server: No such file or directory (PG::ConnectionBad)
Is the server running locally and accepting
connections on Unix domain socket "/var/pgsql_socket/.s.PGSQL.5432"?
I've uninstalled postgresql and reinstalled but seems like I wasn't able to remove the postgresql 8.x version.
I've read several different posts to install and run postgreSQL properly and tried what they've suggested but nothing seems to be working for me.

Answer 1

Installing PostgreSQL in Mac OS X El Capitan using homebrew
First check the 'owner' of the folder '/usr/local' by using this command:
$ ls -la '/usr'
If the owner of the file is 'root', run this command to change the owner to your currently logged user:
$ sudo chown -R `whoami` /usr/local
Install PostgreSQL using homebrew:
$ brew update
$ brew doctor
$ brew install postgresql#15
and that's it!
Uninstall PostgreSQL using homebrew:
$ brew uninstall postgres
then remove this folder: '/usr/local/var/postgres' and then change back the owner of your local
local folder to:
$ sudo chown -R root /usr/local
How to:
List brew services: $ brew services list
Run brew services: $ brew services start <service_name>
ex: $ brew services start postgresql
Stop brew serices: $ brew services stop <service_name>
Logging in to PostgreSQL for the first time:
1.) Run the postgres: $ brew services star postgresql
2.) Create a db using your username: $ createdb `whoami`
3.) Login to postgres: $ psql
To quit psql, just type: \q
4.) Create database (using terminal):
$ createdb <db_name>
psql tutorial:
http://blog.trackets.com/2013/08/19/postgresql-basics-by-example.html
http://exponential.io/blog/2015/02/21/install-postgresql-on-mac-os-x-via-brew/
Optional, installing pgAdmin:
1.) Download pdadmin: https://www.pgadmin.org/download/macosx.php
2.) Press ctrl+click then open to run the dmg file then drag it to your
Application folder. ctrl+click the pdadmin to run it so that it won't
ask for that annoying question again.
Login in to pgAdmin:
Note: Use your username and password when you installed your postgres for first login
then create a new user with privileges later or just change your password from
'File -> Change Password...'

Answer 2

Your Ruby code is apparently linked against the system version of PostgreSQL, which looks for a socket in /var/pgsql_socket. The Homebrew version would look in /tmp. (At this point, make sure that a file like /tmp/.s.PGSQL.5432 exists.) To work around this, you can tell your code to connect to the Homebrew version by specifying /tmp with the "host" option, however your code spells that.
In the future, make sure your Ruby gems are linked against the Homebrew version. Perhaps just uninstalling and reinstalling with the right paths set would do it.