File "/usr/local/lib/python3.4/dist-packages/psycopg2/__init__.py", line 164, in connect conn = _connect(dsn, connection_factory=connection_factory, async=async) django.db.utils.OperationalError: could not translate host name "localhost" to address: Name or service not known
I guess problem with your server name resolution. Its worth checking as said, using psql -h localhost or ping localhost.