无法连接到服务器：PostgreSQL -Heroku

Posted 2023-02-24

【中文标题】无法连接到服务器：PostgreSQL -Heroku

【英文标题】：could not connect to server:PostgreSQL -Heroku

【发布时间】：2017-08-02 08:25:12

【问题描述】：

我在 Heroku 中部署了一个 Django 应用程序。最初，它在 SQLite3 数据库上运行，后来我升级到 PostgreSQL。应用程序在本地设置下完美运行，但是当我将文件推送到服务器时，它的行为与预期不符。 当我登录 django 管理员 (https://my_app_name.herokuapp.com/admin/) 时出现如下错误

could not connect to server: Connection refused
    Is the server running on host "localhost" (127.0.0.1) and accepting
    TCP/IP connections on port 5432?

谁能解决这个问题？谢谢

settings.py

DATABASES = 
    'default': 
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'myproject',
        'USER': 'myprojectuser',
        'PASSWORD': 'password',
        'HOST': 'localhost',
        'PORT': '',
    

追溯

Environment:


Request Method: POST
Request URL: https://cyc-new.herokuapp.com/admin/login/?next=/admin/

Django Version: 1.9
Python Version: 2.7.13
Installed Applications:
['rest_framework',
 'background_task',
 'userApp',
 'imageUpload',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback:

File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  149.                     response = self.process_exception_by_middleware(e, request)

File "/app/.heroku/python/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  147.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  57.         response = view_func(request, *args, **kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/admin/sites.py" in login
  407.         return login(request, **defaults)

File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/views.py" in inner
  49.         return func(*args, **kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/views/decorators/debug.py" in sensitive_post_parameters_wrapper
  76.             return view(request, *args, **kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  149.                     response = view_func(request, *args, **kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  57.         response = view_func(request, *args, **kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/views.py" in login
  69.         if form.is_valid():

File "/app/.heroku/python/lib/python2.7/site-packages/django/forms/forms.py" in is_valid
  161.         return self.is_bound and not self.errors

File "/app/.heroku/python/lib/python2.7/site-packages/django/forms/forms.py" in errors
  153.             self.full_clean()

File "/app/.heroku/python/lib/python2.7/site-packages/django/forms/forms.py" in full_clean
  363.         self._clean_form()

File "/app/.heroku/python/lib/python2.7/site-packages/django/forms/forms.py" in _clean_form
  390.             cleaned_data = self.clean()

File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/forms.py" in clean
  159.                                            password=password)

File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/__init__.py" in authenticate
  74.             user = backend.authenticate(**credentials)

File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/backends.py" in authenticate
  17.             user = UserModel._default_manager.get_by_natural_key(username)

File "/app/.heroku/python/lib/python2.7/site-packages/django/contrib/auth/base_user.py" in get_by_natural_key
  45.         return self.get(**self.model.USERNAME_FIELD: username)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/manager.py" in manager_method
  122.                 return getattr(self.get_queryset(), name)(*args, **kwargs)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py" in get
  381.         num = len(clone)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py" in __len__
  240.         self._fetch_all()

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py" in _fetch_all
  1074.             self._result_cache = list(self.iterator())

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/query.py" in __iter__
  52.         results = compiler.execute_sql()

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/models/sql/compiler.py" in execute_sql
  850.         cursor = self.connection.cursor()

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/base/base.py" in cursor
  231.             cursor = self.make_debug_cursor(self._cursor())

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/base/base.py" in _cursor
  204.         self.ensure_connection()

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/base/base.py" in ensure_connection
  199.                 self.connect()

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/utils.py" in __exit__
  95.                 six.reraise(dj_exc_type, dj_exc_value, traceback)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/base/base.py" in ensure_connection
  199.                 self.connect()

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/base/base.py" in connect
  171.         self.connection = self.get_new_connection(conn_params)

File "/app/.heroku/python/lib/python2.7/site-packages/django/db/backends/postgresql/base.py" in get_new_connection
  175.         connection = Database.connect(**conn_params)

File "/app/.heroku/python/lib/python2.7/site-packages/psycopg2/__init__.py" in connect
  164.     conn = _connect(dsn, connection_factory=connection_factory, async=async)

Exception Type: OperationalError at /admin/login/
Exception Value: could not connect to server: Connection refused
    Is the server running on host "localhost" (127.0.0.1) and accepting
    TCP/IP connections on port 5432?

【问题讨论】：

它对你有用吗？

【参考方案1】：

Heroku 依赖于数据库配置环境变量。阅读here了解更多信息。

在您的本地环境中（您启用了虚拟环境，对吗？）：

pip install dj-database-url pip freeze > requirements.txt

然后在你的production设置中（你的本地设置仍然可以使用localhost db），添加这些：

import dj_database_url DATABASES = default': dj_database_url.config()

其余的你都知道。

git add .
git commit -m 'added dj-database-url package'`
git push heroku master

【讨论】：

我应该为此目的使用任何特定的 URI/URL 吗？

没有。它会自动为你处理一切！

但是，当我按照你所说的那样更改设置时，它显示另一个错误为relation "auth_user" does not exist LINE 1: ...user"."is_active", "auth_user"."date_joined" FROM "auth_user...

也许你错过了heroku run python manage.py makemigrations和heroku run python manage.py migrate