[Bug 1307265] [NEW] installation hangs if postgres is not listening on default port

[Michael Hudson-Doyle]

Public bug reported:

Hi,

If there is no postgres listening on port 5432 (which can happen when,
for example, you install 9.1 on saucy, upgrade to trusty, thereby
installing 9.3 and then purging 9.1), and install maas this happens:

Setting up maas-region-controller (1.5+bzr2236-0ubuntu1) ...
Considering dependency proxy for proxy_http:
Module proxy already enabled
Module proxy_http already enabled
Module expires already enabled
Module wsgi already enabled
rsyslog stop/waiting
rsyslog start/running, process 29785
squid-deb-proxy stop/waiting
squid-deb-proxy start/running, process 29839
 * Restarting message broker rabbitmq-server
   ...done.
Creating user "maas_longpoll" ...
...done.
Creating vhost "/maas_longpoll" ...
...done.
Setting permissions for user "maas_longpoll" in vhost "/maas_longpoll" ...
...done.
Changing password for user "maas_workers" ...
...done.
 * Restarting PostgreSQL 9.3 database server
   ...done.
dbconfig-common: writing config to /etc/dbconfig-common/maas-region-controller.conf
creating postgres user maas:  success.
verifying creation of user: success.
creating database maasdb: success.
verifying database maasdb exists: success.
dbconfig-common: flushing administrative password
Syncing...
Traceback (most recent call last):
  File "/usr/bin/django-admin", line 5, in <module>
    management.execute_from_command_line()
  File "/usr/lib/python2.7/dist-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
  File "/usr/lib/python2.7/dist-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 415, in handle
    return self.handle_noargs(**options)
  File "/usr/lib/python2.7/dist-packages/south/management/commands/syncdb.py", line 90, in handle_noargs
    syncdb.Command().execute(**options)
  File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/usr/lib/python2.7/dist-packages/django/core/management/base.py", line 415, in handle
    return self.handle_noargs(**options)
  File "/usr/lib/python2.7/dist-packages/django/core/management/commands/syncdb.py", line 57, in handle_noargs
    cursor = connection.cursor()
  File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 159, in cursor
    cursor = util.CursorWrapper(self._cursor(), self)
  File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 129, in _cursor
    self.ensure_connection()
  File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 124, in ensure_connection
    self.connect()
  File "/usr/lib/python2.7/dist-packages/django/db/utils.py", line 99, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 124, in ensure_connection
    self.connect()
  File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 112, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/usr/lib/python2.7/dist-packages/django/db/backends/postgresql_psycopg2/base.py", line 116, in get_new_connection
    return Database.connect(**conn_params)
  File "/usr/lib/python2.7/dist-packages/psycopg2/__init__.py", line 179, in connect
    connection_factory=connection_factory, async=async)
django.db.utils.OperationalError: could not connect to server: Connection refused
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5432?

and then it hangs.

** Affects: maas (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1307265

Title:
  installation hangs if postgres is not listening on default port

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