如何在同一个Docker中运行带有mysql的Django Web应用程序？错误（docker-compose up -d似乎正常工作）

一切似乎工作正常：

但我无法在localhost:8000上访问它。

'''

root@zenek:~/InternF# sudo docker-compose ps

Name Command State Ports

internf_app_1 sh -c python manage.py run ... Up 0.0.0.0:8000->8000/tcp

internf_db_1 docker-entrypoint.sh mysqld Up 0.0.0.0:3306->3306/tcp, 33060/tcp

'''

在尝试迁移后，我遇到了这个错误。我在使用postgres数据库时也遇到了类似的错误。

'''

root@zenek:~/InternF# sudo docker-compose run app python manage.py migrate
Starting internf_db_1 ... done
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/mysql/base.py", line 227, in get_new_connection
    return Database.connect(**conn_params)
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/__init__.py", line 84, in Connect
    return Connection(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/connections.py", line 179, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
MySQLdb._exceptions.OperationalError: (1045, '无法加载插件caching_sha2_password:/usr//usr/lib/x86_64-linux-gnu/mariadb19/plugin/caching_sha2_password.so:找不到文件或目录')
上述异常是以下异常的直接原因：
Traceback (most recent call last):
  File "manage.py", line 15, in 
    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 361, in execute
    self.check()
  File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 390, in check
    include_deployment_checks=include_deployment_checks,
  File "/usr/local/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 64, in _run_checks
    issues = run_checks(tags=[Tags.database])
  File "/usr/local/lib/python3.6/site-packages/django/core/checks/registry.py", line 72, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/usr/local/lib/python3.6/site-packages/django/core/checks/database.py", line 10, in check_database_backends
    issues.extend(conn.validation.check(**kwargs))
  File "/usr/local/lib/python3.6/site-packages/django/db/backends/mysql/validation.py", line 9, in check
    issues.extend(self._check_sql_mode(**kwargs))
  File "/usr/local/lib/python3.6/site-packages/django/db/backends/mysql/validation.py", line 13, in _check_sql_mode
    with self.connection.cursor() as 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/mysql/base.py", line 227, in get_new_connection
    return Database.connect(**conn_params)
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/__init__.py", line 84, in Connect
    return Connection(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/connections.py", line 179, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
django.db.utils.OperationalError: (1045, '无法加载插件caching_sha2_password:/usr//usr/lib/x86_64-linux-gnu/mariadb19/plugin/caching_sha2_password.so:找不到文件或目录')

'''

我正在使用：

'''

version: "3"
services:
  app:
    build:
      context: .
    ports:
      - "8000:8000"
    volumes:
      - ./app:/app
    command: >
      sh -c "python manage.py runserver 0.0.0.0:8000"
    depends_on:
      - db
  db:
    image: mysql
    ports:
      - '3306:3306'
    environment:
       MYSQL_DATABASE: 'mysql'
       MYSQL_USER: 'root'
       MYSQL_PASSWORD: 'password'
       MYSQL_ROOT_PASSWORD: 'password'

'''

和Dockerfile

'''

FROM python:3.6
ENV PYTHONUNBUFFER 1
COPY ./requirements.txt /requirements.txt
RUN pip install -r /requirements.txt
RUN mkdir /app
WORKDIR /app
COPY ./app /app

'''

求助！