Python 3.x 尝试在docker中使用django配置postgresql时，角色不存在

我对docker和postgres都是新手。在这里，我试图将博士后与django联系起来。每次我尝试

docker compose up

时，我都会遇到这个错误

db_1   | PostgreSQL Database directory appears to contain a database; Skipping initialization
db_1   | 
db_1   | 2020-09-15 21:58:42.169 UTC [1] LOG:  starting PostgreSQL 12.4 (Debian 12.4-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
db_1   | 2020-09-15 21:58:42.170 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
db_1   | 2020-09-15 21:58:42.170 UTC [1] LOG:  listening on IPv6 address "::", port 5432
db_1   | 2020-09-15 21:58:42.179 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db_1   | 2020-09-15 21:58:42.197 UTC [25] LOG:  database system was shut down at 2020-09-15 21:58:41 UTC
db_1   | 2020-09-15 21:58:42.203 UTC [1] LOG:  database system is ready to accept connections
web_1  | Watching for file changes with StatReloader
web_1  | Performing system checks...
web_1  | 
web_1  | System check identified no issues (0 silenced).
db_1   | 2020-09-15 21:58:45.233 UTC [32] FATAL:  password authentication failed for user "sddhruvo"
db_1   | 2020-09-15 21:58:45.233 UTC [32] DETAIL:  Role "sddhruvo" does not exist.
db_1   |    Connection matched pg_hba.conf line 99: "host all all all md5"
web_1  | Exception in thread django-main-thread:
web_1  | Traceback (most recent call last):
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
web_1  |     self.connect()
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/utils/asyncio.py", line 26, in inner
web_1  |     return func(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 200, in connect
web_1  |     self.connection = self.get_new_connection(conn_params)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/utils/asyncio.py", line 26, in inner
web_1  |     return func(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/postgresql/base.py", line 187, in get_new_connection
web_1  |     connection = Database.connect(**conn_params)
web_1  |   File "/usr/local/lib/python3.7/site-packages/psycopg2/__init__.py", line 127, in connect
web_1  |     conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
web_1  | psycopg2.OperationalError: FATAL:  password authentication failed for user "sddhruvo"
web_1  | 
web_1  | 
web_1  | The above exception was the direct cause of the following exception:
web_1  | 
web_1  | Traceback (most recent call last):
web_1  |   File "/usr/local/lib/python3.7/threading.py", line 926, in _bootstrap_inner
web_1  |     self.run()
web_1  |   File "/usr/local/lib/python3.7/threading.py", line 870, in run
web_1  |     self._target(*self._args, **self._kwargs)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 53, in wrapper
web_1  |     fn(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 121, in inner_run
web_1  |     self.check_migrations()
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/core/management/base.py", line 459, in check_migrations
web_1  |     executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/migrations/executor.py", line 18, in __init__
web_1  |     self.loader = MigrationLoader(self.connection)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/migrations/loader.py", line 53, in __init__
web_1  |     self.build_graph()
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/migrations/loader.py", line 216, in build_graph
web_1  |     self.applied_migrations = recorder.applied_migrations()
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/migrations/recorder.py", line 77, in applied_migrations
web_1  |     if self.has_table():
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/migrations/recorder.py", line 55, in has_table
web_1  |     with self.connection.cursor() as cursor:
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/utils/asyncio.py", line 26, in inner
web_1  |     return func(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 259, in cursor
web_1  |     return self._cursor()
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 235, in _cursor
web_1  |     self.ensure_connection()
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/utils/asyncio.py", line 26, in inner
web_1  |     return func(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
web_1  |     self.connect()
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/utils.py", line 90, in __exit__
web_1  |     raise dj_exc_value.with_traceback(traceback) from exc_value
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
web_1  |     self.connect()
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/utils/asyncio.py", line 26, in inner
web_1  |     return func(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/base/base.py", line 200, in connect
web_1  |     self.connection = self.get_new_connection(conn_params)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/utils/asyncio.py", line 26, in inner
web_1  |     return func(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.7/site-packages/django/db/backends/postgresql/base.py", line 187, in get_new_connection
web_1  |     connection = Database.connect(**conn_params)
web_1  |   File "/usr/local/lib/python3.7/site-packages/psycopg2/__init__.py", line 127, in connect
web_1  |     conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
web_1  | django.db.utils.OperationalError: FATAL:  password authentication failed for user "sddhruvo"
web_1  | 

my docker-compose.yml文件：

version: '3.7'


services:
  web:
    build: .
    command: python /code/manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - 8000:8000
    depends_on:
      - db
  db:
    image: postgres:12
    environment:
      - POSTGRES_DB=sddhruvo
      - POSTGRES_USER=sddhruvo
      - POSTGRES_PASSWORD=password
    volumes:
      - postgres_data:/var/lib/postgresql/data/
volumes:
  postgres_data:

my django数据库设置：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'sddhruvo',
        'USER': 'sddhruvo',
        'PASSWORD': 'password',
        'HOST': 'db',
        'PORT': 5432
    }
}

我试着解决它3个小时，但没有运气。我100%确信django设置名称、用户和密码是正确的。仍在docker中，表示角色“sddhruvo”不存在。最后，``django.db.utils.OperationalError:致命：用户“sddhruvo”的密码身份验证失败

---

我认为有两种可能性：（a）您在最初填充“postgres_”数据卷后更改了密码，或者（b），更可能的情况是，您的应用程序正在尝试连接到数据库服务器，而数据库服务器尚未被实际读取以处理请求。您可以通过在postgres容器启动一分钟后重新启动web容器来测试问题是否为（b）。