docker.env username variable not read by web container (hardcoded)

[LivingWithHippos]

I modified the standard settings in docker.env but after the docker installation I get these logs. The connection is fine if I change only the db name and the password.

 File "/usr/local/lib/python3.6/site-packages/django/db/migrations/recorder.py", line 73, in applied_migrations
   if self.has_table():
 File "/usr/local/lib/python3.6/site-packages/django/db/migrations/recorder.py", line 56, in has_table
   return self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor())
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 256, in cursor
   return self._cursor()
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 233, in _cursor
   self.ensure_connection()
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
   self.connect()
 File "/usr/local/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
   raise dj_exc_value.with_traceback(traceback) from exc_value
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
   self.connect()
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 195, in connect
   self.connection = self.get_new_connection(conn_params)
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 178, in get_new_connection
   connection = Database.connect(**conn_params)
 File "/usr/local/lib/python3.6/site-packages/psycopg2/__init__.py", line 130, in connect
   conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError: FATAL:  password authentication failed for user "postgres"
/usr/local/lib/python3.6/site-packages/psycopg2/__init__.py:144: UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>.
 """)
Traceback (most recent call last):
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
   self.connect()
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 195, in connect
   self.connection = self.get_new_connection(conn_params)
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 178, in get_new_connection
   connection = Database.connect(**conn_params)
 File "/usr/local/lib/python3.6/site-packages/psycopg2/__init__.py", line 130, in connect
   conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: FATAL:  password authentication failed for user "postgres"
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
 File "manage.py", line 15, in <module>
   execute_from_command_line(sys.argv)
 File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
   utility.execute()
 File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 375, in execute
   self.fetch_command(subcommand).run_from_argv(self.argv)
 File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 323, in run_from_argv
   self.execute(*args, **cmd_options)
 File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 364, in execute
   output = self.handle(*args, **options)
 File "/usr/src/reminiscence/pages/management/commands/createdefaultsu.py", line 9, in handle
   if not qlist:
 File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 278, in __bool__
   self._fetch_all()
 File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 1242, in _fetch_all
   self._result_cache = list(self._iterable_class(self))
 File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py", line 55, in __iter__
   results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
 File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1138, in execute_sql
   cursor = self.connection.cursor()
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 256, in cursor
   return self._cursor()
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 233, in _cursor
   self.ensure_connection()
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
   self.connect()
 File "/usr/local/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
   raise dj_exc_value.with_traceback(traceback) from exc_value
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
   self.connect()
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 195, in connect
   self.connection = self.get_new_connection(conn_params)
 File "/usr/local/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 178, in get_new_connection
   connection = Database.connect(**conn_params)
 File "/usr/local/lib/python3.6/site-packages/psycopg2/__init__.py", line 130, in connect
   conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError: FATAL:  password authentication failed for user "postgres"

[thprice]

Just run into the same problem.
Unfortunately, the docker.env file is misleading. The db user env variable must be named POSTGRES__USER (notice the double underscores). Alternatively, you could also change it in reminiscence/dockersettings.py