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python - 使用 Postgres 时 AWS Beanstalk 上的 Django 错误

问题描述

我有一个在 AWS Beanstalk 上使用 RDS Postgres 的 Django 应用程序。Beanstalk 环境不使用默认的 RDS 设置。我有一个单独的 Postgres RDS 实例正在运行。

在我的设置文件中，我的数据库字典有以下内容：

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': os.environ['RDS_DB_NAME'],
        'USER': os.environ['RDS_USERNAME'],
        'PASSWORD': os.environ['RDS_PASSWORD'],
        'HOST': os.environ['RDS_HOSTNAME'],
        'PORT': os.environ['RDS_PORT'],
    }
}

当我访问环境的 URL 时，我收到 500 错误。以下是error_logs一次访问。

[Sun Dec 23 18:43:24.116897 2018] [:error] [pid 1881] [remote 172.31.30.131:0] mod_wsgi (pid=1881): Target WSGI script '/opt/python/current/app/my_app/wsgi.py' cannot be loaded as Python module.
[Sun Dec 23 18:43:24.117094 2018] [:error] [pid 1881] [remote 172.31.30.131:0] mod_wsgi (pid=1881): Exception occurred processing WSGI script '/opt/python/current/app/my_app/wsgi.py'.
[Sun Dec 23 18:43:24.117230 2018] [:error] [pid 1881] [remote 172.31.30.131:0] Traceback (most recent call last):
[Sun Dec 23 18:43:24.117313 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/current/app/my_app/wsgi.py", line 16, in <module>
[Sun Dec 23 18:43:24.117458 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     application = get_wsgi_application()
[Sun Dec 23 18:43:24.117553 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/core/wsgi.py", line 13, in get_wsgi_application
[Sun Dec 23 18:43:24.117668 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     django.setup(set_prefix=False)
[Sun Dec 23 18:43:24.117757 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/__init__.py", line 27, in setup
[Sun Dec 23 18:43:24.117899 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     apps.populate(settings.INSTALLED_APPS)
[Sun Dec 23 18:43:24.117971 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/apps/registry.py", line 108, in populate
[Sun Dec 23 18:43:24.118183 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     app_config.import_models()
[Sun Dec 23 18:43:24.118266 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/apps/config.py", line 202, in import_models
[Sun Dec 23 18:43:24.118444 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     self.models_module = import_module(models_module_name)
[Sun Dec 23 18:43:24.118511 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
[Sun Dec 23 18:43:24.118625 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     __import__(name)
[Sun Dec 23 18:43:24.118687 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/contrib/auth/models.py", line 4, in <module>
[Sun Dec 23 18:43:24.118874 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
[Sun Dec 23 18:43:24.118956 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/contrib/auth/base_user.py", line 52, in <module>
[Sun Dec 23 18:43:24.119098 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     class AbstractBaseUser(models.Model):
[Sun Dec 23 18:43:24.119159 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/models/base.py", line 124, in __new__
[Sun Dec 23 18:43:24.120069 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     new_class.add_to_class('_meta', Options(meta, app_label))
[Sun Dec 23 18:43:24.120155 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/models/base.py", line 325, in add_to_class
[Sun Dec 23 18:43:24.120229 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     value.contribute_to_class(cls, name)
[Sun Dec 23 18:43:24.120306 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/models/options.py", line 214, in contribute_to_class
[Sun Dec 23 18:43:24.120597 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
[Sun Dec 23 18:43:24.120827 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/__init__.py", line 33, in __getattr__
[Sun Dec 23 18:43:24.120943 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     return getattr(connections[DEFAULT_DB_ALIAS], item)
[Sun Dec 23 18:43:24.121023 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/utils.py", line 211, in __getitem__
[Sun Dec 23 18:43:24.121191 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     backend = load_backend(db['ENGINE'])
[Sun Dec 23 18:43:24.121260 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/utils.py", line 115, in load_backend
[Sun Dec 23 18:43:24.121347 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     return import_module('%s.base' % backend_name)
[Sun Dec 23 18:43:24.121415 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module
[Sun Dec 23 18:43:24.121495 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     __import__(name)
[Sun Dec 23 18:43:24.121550 2018] [:error] [pid 1881] [remote 172.31.30.131:0]   File "/opt/python/run/venv/lib/python2.7/site-packages/django/db/backends/postgresql/base.py", line 25, in <module>
[Sun Dec 23 18:43:24.121728 2018] [:error] [pid 1881] [remote 172.31.30.131:0]     raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
[Sun Dec 23 18:43:24.121799 2018] [:error] [pid 1881] [remote 172.31.30.131:0] ImproperlyConfigured: Error loading psycopg2 module: No module named psycopg2

如果我注释掉我的数据库字典并访问一个不查询数据库的视图，我会得到 200 和预期的内容。如果我然后取消注释数据库字典，无论我访问什么视图，我都会得到 500。

在我的requirements.txt我有Django==1.11.17和psycopg2==2.7.5。在创建或更新环境时，我可以从eb-activity.logPIP 成功安装这些的位置看到。

我真的不知道此时问题可能是什么。

标签： pythondjangopostgresqlamazon-web-services

解决方案

最后，这最终成为了 Python 路径问题。解决方案出现在这篇关于在 EB 上设置 Django 的文章的评论中： https ://realpython.com/deploying-a-django-app-and-postgresql-to-aws-elastic-beanstalk/#comment-2849390172

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