Django app failing in Travis CI: server not running on localhost - django

Question

I am testing a sample Django app in Travis CI using a Postgres database. I wrote some basic tests for models that passed successfully on my development environment. When I push the code to Travis the following error occurs:
travis link : https://travis-ci.org/Navajyoth/django-travis/jobs/64052563
github link : https://github.com/Navajyoth/django-travis
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
utility.execute()
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/core/management/__init__.py", line 330, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/core/management/commands/test.py", line 30, in run_from_argv
super(Command, self).run_from_argv(argv)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/core/management/base.py", line 390, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/core/management/commands/test.py", line 74, in execute
super(Command, self).execute(*args, **options)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/core/management/base.py", line 441, in execute
output = self.handle(*args, **options)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/core/management/commands/test.py", line 90, in handle
failures = test_runner.run_tests(test_labels)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/test/runner.py", line 210, in run_tests
old_config = self.setup_databases()
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/test/runner.py", line 166, in setup_databases
**kwargs
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/test/runner.py", line 370, in setup_databases
serialize=connection.settings_dict.get("TEST", {}).get("SERIALIZE", True),
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/backends/base/creation.py", line 354, in create_test_db
self._create_test_db(verbosity, autoclobber, keepdb)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/backends/base/creation.py", line 447, in _create_test_db
with self._nodb_connection.cursor() as cursor:
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/backends/base/base.py", line 164, in cursor
cursor = self.make_cursor(self._cursor())
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/backends/base/base.py", line 135, in _cursor
self.ensure_connection()
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/backends/base/base.py", line 130, in ensure_connection
self.connect()
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/utils.py", line 97, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/backends/base/base.py", line 130, in ensure_connection
self.connect()
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/backends/base/base.py", line 119, in connect
self.connection = self.get_new_connection(conn_params)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 172, in get_new_connection
connection = Database.connect(**conn_params)
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/psycopg2/__init__.py", line 164, in connect
conn = _connect(dsn, connection_factory=connection_factory, async=async)
django.db.utils.OperationalError: could not connect to server: Connection refused
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5432?
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?
The command "python manage.py test apps.account --settings=settings.dev" exited with 1.
Done. Your build exited with 1.

Answer 1

Main issues in the above problem.
(1) Unsupported version of PostgreSQL
(2) Removing patch release version from PostgreSQL addon.
It fixed the problem

Answer 2

The build is failing because you are using postgres as a db backend to test your app. The traceback shows psycopg2 is unable to connect on localhost:
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/site-packages/psycopg2/__init__.py", line 164, in connect
conn = _connect(dsn, connection_factory=connection_factory,async=async)
django.db.utils.OperationalError: could not connect to server:Connection refused
Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432?
could not connect to server: Connection refused`
You should either use sqlite as a db backend or specify correct database connection
parameters in your settings.dev. refer https://docs.djangoproject.com/en/1.8/topics/testing/overview/#the-test-database