Traceback (most recent call last):
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
    self.connect()
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/base/base.py", line 195, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/mysql/base.py", line 227, in get_new_connection
    return Database.connect(**conn_params)
  File "/openedx/venv/lib/python3.8/site-packages/MySQLdb/__init__.py", line 130, in Connect
    return Connection(*args, **kwargs)
  File "/openedx/venv/lib/python3.8/site-packages/MySQLdb/connections.py", line 185, in __init__
    super().__init__(*args, **kwargs2)
MySQLdb._exceptions.OperationalError: (2003, "Can't connect to MySQL server on 'mysql:3306' (111)")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/openedx/venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/openedx/venv/lib/python3.8/site-packages/django/utils/deprecation.py", line 94, in __call__
    response = response or self.get_response(request)
  File "/openedx/venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
 File "/openedx/venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/openedx/venv/lib/python3.8/site-packages/django/core/handlers/exception.py", line 129, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "/openedx/edx-platform/common/djangoapps/util/views.py", line 95, in wrapper
    return func(request, *args, **kwargs)
  File "./lms/djangoapps/static_template_view/views.py", line 125, in render_500
    return HttpResponseServerError(render_to_string('static_templates/server-error.html', {}, request=request))
  File "/openedx/edx-platform/common/djangoapps/edxmako/shortcuts.py", line 182, in render_to_string
    return template.render(dictionary, request)
  File "/openedx/edx-platform/common/djangoapps/edxmako/template.py", line 82, in render
    return self.mako_template.render_unicode(**context_dictionary)
  File "/openedx/venv/lib/python3.8/site-packages/mako/template.py", line 478, in render_unicode
    return runtime._render(
  File "/openedx/venv/lib/python3.8/site-packages/mako/runtime.py", line 878, in _render
    _render_context(
  File "/openedx/venv/lib/python3.8/site-packages/mako/runtime.py", line 920, in _render_context
    _exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
  File "/openedx/venv/lib/python3.8/site-packages/mako/runtime.py", line 947, in _exec_template
    callable_(context, *args, **kwargs)
  File "/tmp/mako_lms/ac16784d5a7c7e5647770588ca0dc619/main.html.py", line 345, in render_body
    runtime._include_file(context, (static.get_template_path('header.html')), _template_uri, online_help_token=online_help_token)
  File "/openedx/venv/lib/python3.8/site-packages/mako/runtime.py", line 795, in _include_file
    callable_(ctx, **kwargs)
  File "/tmp/mako_lms/ac16784d5a7c7e5647770588ca0dc619/header.html.py", line 34, in render_body
    runtime._include_file(context, (static.get_template_path(relative_path='header/header.html')), _template_uri, online_help_token=online_help_token)
  File "/openedx/venv/lib/python3.8/site-packages/mako/runtime.py", line 795, in _include_file
    callable_(ctx, **kwargs)
  File "/tmp/mako_lms/ac16784d5a7c7e5647770588ca0dc619/header/header.html.py", line 77, in render_body
    if waffle.switch_is_active('enable_unsupported_browser_alert'):
  File "/openedx/venv/lib/python3.8/site-packages/waffle/__init__.py", line 21, in switch_is_active
switch = Switch.get(switch_name)
  File "/openedx/venv/lib/python3.8/site-packages/waffle/models.py", line 46, in get
    obj = cls.get_from_db(name)
  File "/openedx/venv/lib/python3.8/site-packages/waffle/models.py", line 59, in get_from_db
    return objects.get(name=name)
  File "/openedx/venv/lib/python3.8/site-packages/django/db/models/manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/openedx/venv/lib/python3.8/site-packages/django/db/models/query.py", line 402, in get
    num = len(clone)
  File "/openedx/venv/lib/python3.8/site-packages/django/db/models/query.py", line 256, in __len__
    self._fetch_all()
  File "/openedx/venv/lib/python3.8/site-packages/django/db/models/query.py", line 1242, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/openedx/venv/lib/python3.8/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 "/openedx/venv/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1140, in execute_sql
    cursor = self.connection.cursor()
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/base/base.py", line 256, in cursor
    return self._cursor()
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/base/base.py", line 233, in _cursor
    self.ensure_connection()
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
    self.connect()
  File "/openedx/venv/lib/python3.8/site-packages/django/db/utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
    self.connect()
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/base/base.py", line 195, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/openedx/venv/lib/python3.8/site-packages/django/db/backends/mysql/base.py", line 227, in get_new_connection
    return Database.connect(**conn_params)
  File "/openedx/venv/lib/python3.8/site-packages/MySQLdb/__init__.py", line 130, in Connect
    return Connection(*args, **kwargs)
  File "/openedx/venv/lib/python3.8/site-packages/MySQLdb/connections.py", line 185, in __init__
    super().__init__(*args, **kwargs2)
django.db.utils.OperationalError: (2003, "Can't connect to MySQL server on 'mysql:3306' (111)")