psycopg2.OperationalError: could not connect to server: No such file or directory

psycopg2.OperationalError

$ dotcloud deploy --application mediathread9 latest
==> Submitting a deployment request for revision latest of application mediathread9
==> Deployment of revision rsync-1356287081260 scheduled for mediathread9
- 2012-12-23 (mediathread9 deployment, deploy_id=efb24b35-55be-4933-89f6-eb0af54516a9)
12:30:44: --> Deployment scheduled for application (mediathread9) at revision rsync-1356287081260
12:31:15: [www.0] Running postinstall script...
12:31:17: [www.0] + python createdb.py
12:31:18: [www.0] create_dbs start
12:31:18: [www.0] create_dbs: let's go.
12:31:18: [www.0] create_dbs: got settings.
12:31:18: [www.0] creating database mediathread9 on mediathread9-natea.azva.dotcloud.net
12:31:18: [www.0] database "mediathread9" already exists
12:31:18: [www.0] 
12:31:18: [www.0] moving right along...
12:31:18: [www.0] + mkdir -p /home/dotcloud/data/media /home/dotcloud/volatile/static
12:31:18: [www.0] + python mediathread/manage.py syncdb --noinput
12:31:19: [www.0] Syncing...
12:31:19: [www.0] Traceback (most recent call last):
12:31:19: [www.0]   File "mediathread/manage.py", line 14, in <module>
12:31:19: [www.0]     execute_manager(settings_appsembler)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 438, in execute_manager
12:31:19: [www.0]     utility.execute()
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 379, in execute
12:31:19: [www.0]     self.fetch_command(subcommand).run_from_argv(self.argv)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/core/management/base.py", line 191, in run_from_argv
12:31:19: [www.0]     self.execute(*args, **options.__dict__)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/core/management/base.py", line 220, in execute
12:31:19: [www.0]     output = self.handle(*args, **options)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/core/management/base.py", line 351, in handle
12:31:19: [www.0]     return self.handle_noargs(**options)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/south/management/commands/syncdb.py", line 90, in handle_noargs
12:31:19: [www.0]     syncdb.Command().execute(**options)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/core/management/base.py", line 220, in execute
12:31:19: [www.0]     output = self.handle(*args, **options)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/core/management/base.py", line 351, in handle
12:31:19: [www.0]     return self.handle_noargs(**options)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/core/management/commands/syncdb.py", line 56, in handle_noargs
12:31:19: [www.0]     cursor = connection.cursor()
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/db/backends/__init__.py", line 252, in cursor
12:31:19: [www.0]     cursor = util.CursorWrapper(self._cursor(), self)
12:31:19: [www.0]   File "/opt/ve/2.7/local/lib/python2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 140, in _cursor
12:31:19: [www.0]     self.connection = Database.connect(**conn_params)
12:31:19: [www.0] psycopg2.OperationalError: could not connect to server: No such file or directory
12:31:19: [www.0]   Is the server running locally and accepting
12:31:19: [www.0] 	connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
12:31:19: [www.0] 
12:31:20: [www.0] deployment aborted due to unexpected command result: "chmod +x postinstall ; ./postinstall" failed with return code 1
12:31:20: [www.0] Installation failed for service (www) instance #0
12:31:20: --> Deployment of application (mediathread9) failed with 1 installation error(s)