流浪者上的Django，psycopg2 OperationalError：无法连接到服务器：没有这样的文件或目录

Question

On vagrant box, installed postgres via apt-get install python-psycopg2 . Tested import successfully.

$ python
Python 2.6.5 (r265:79063, Oct  1 2012, 22:04:36) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import psycopg2
>>> exit()

Django settings file:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2', # Add 'postgresql_psycopg2', 'mysql', 'sqlite3' or 'oracle'.
        'NAME': '/vagrant/v-root/projects/tdg/tdg/mydata.db',                      # Or path to database file if using sqlite3.
        'USER': 'username',                      # Not used with sqlite3.
        'PASSWORD': 'password',                  # Not used with sqlite3.
        'HOST': '',                      # Set to empty string for localhost. Not used with sqlite3.
        'PORT': '',                      # Set to empty string for default. Not used with sqlite3.
    }
}

Having an issue with postgres_psycopg2 not being found on new vagrant box.

$ python manage.py shell
Python 2.6.5 (r265:79063, Oct  1 2012, 22:04:36) 
[GCC 4.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from django.db import connection
>>> cursor = connection.cursor()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/local/lib/python2.6/dist-packages/django/db/backends/__init__.py", line 306, in cursor
    cursor = self.make_debug_cursor(self._cursor())
  File "/usr/local/lib/python2.6/dist-packages/django/db/backends/postgresql_psycopg2/base.py", line 177, in _cursor
    self.connection = Database.connect(**conn_params)
OperationalError: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

>>> 

I ran a netstat —listen and I did not see port 5432 listening. Only 22 (SSH) and 8000 (Django app) are listening.

Answer 1

You didn't quite install postgres - you just installed psycopg2, which is a python client for postgres. You'll need to install and run postgres like so:

apt-get install postgresql
/etc/init.d/postgresql start

(You will probably also need to log into it and create yourself a database for your project to talk to)