通过 AWS Elastic Beanstalk 成功部署 Django，但出现 500 错误

Posted 2023-03-04

【中文标题】通过 AWS Elastic Beanstalk 成功部署 Django，但出现 500 错误

【英文标题】：Successful Django Deploy Through AWS Elastic Beanstalk, But Getting 500 ERROR

【发布时间】：2020-05-14 12:15:16

【问题描述】：

上周我一直被困在这个问题上，不知道下一步该怎么做。

我有一个使用 mysql 数据库的 Django 应用程序。我使用 AWS Elastic Beanstalk 使用以下教程部署了它：https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/create-deploy-python-django.html

成功部署。但是，在尝试访问该站点时，我不断收到 500 个错误。我也更新了主机值。

这是 error_log，但我无法从中推断出太多信息。

[Tue Jan 28 08:05:34.444677 2020] [suexec:notice] [pid 3125] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Tue Jan 28 08:05:34.460731 2020] [http2:warn] [pid 3125] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.
[Tue Jan 28 08:05:34.460743 2020] [http2:warn] [pid 3125] AH02951: mod_ssl does not seem to be enabled
[Tue Jan 28 08:05:34.461206 2020] [lbmethod_heartbeat:notice] [pid 3125] AH02282: No slotmem from mod_heartmonitor
[Tue Jan 28 08:05:34.461249 2020] [:warn] [pid 3125] mod_wsgi: Compiled for Python/3.6.2.
[Tue Jan 28 08:05:34.461253 2020] [:warn] [pid 3125] mod_wsgi: Runtime using Python/3.6.8.
[Tue Jan 28 08:05:34.463081 2020] [mpm_prefork:notice] [pid 3125] AH00163: Apache/2.4.41 (Amazon) mod_wsgi/3.5 Python/3.6.8 configured -- resuming normal operations
[Tue Jan 28 08:05:34.463096 2020] [core:notice] [pid 3125] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
[Tue Jan 28 08:06:21.350696 2020] [mpm_prefork:notice] [pid 3125] AH00169: caught SIGTERM, shutting down
[Tue Jan 28 08:06:22.419261 2020] [suexec:notice] [pid 4501] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Tue Jan 28 08:06:22.435310 2020] [so:warn] [pid 4501] AH01574: module wsgi_module is already loaded, skipping
[Tue Jan 28 08:06:22.437572 2020] [http2:warn] [pid 4501] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.
[Tue Jan 28 08:06:22.437582 2020] [http2:warn] [pid 4501] AH02951: mod_ssl does not seem to be enabled
[Tue Jan 28 08:06:22.438217 2020] [lbmethod_heartbeat:notice] [pid 4501] AH02282: No slotmem from mod_heartmonitor
[Tue Jan 28 08:06:22.438283 2020] [:warn] [pid 4501] mod_wsgi: Compiled for Python/3.6.2.
[Tue Jan 28 08:06:22.438292 2020] [:warn] [pid 4501] mod_wsgi: Runtime using Python/3.6.8.
[Tue Jan 28 08:06:22.440572 2020] [mpm_prefork:notice] [pid 4501] AH00163: Apache/2.4.41 (Amazon) mod_wsgi/3.5 Python/3.6.8 configured -- resuming normal operations
[Tue Jan 28 08:06:22.440593 2020] [core:notice] [pid 4501] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
[Tue Jan 28 08:08:03.028260 2020] [mpm_prefork:notice] [pid 4501] AH00169: caught SIGTERM, shutting down
Exception ignored in: <bound method BaseEventLoop.__del__ of <_UnixSelectorEventLoop running=False closed=False debug=False>>
Traceback (most recent call last):
  File "/usr/lib64/python3.6/asyncio/base_events.py", line 526, in __del__
NameError: name 'ResourceWarning' is not defined
[Tue Jan 28 08:08:04.152017 2020] [suexec:notice] [pid 4833] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Tue Jan 28 08:08:04.168082 2020] [so:warn] [pid 4833] AH01574: module wsgi_module is already loaded, skipping
[Tue Jan 28 08:08:04.170245 2020] [http2:warn] [pid 4833] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.
[Tue Jan 28 08:08:04.170256 2020] [http2:warn] [pid 4833] AH02951: mod_ssl does not seem to be enabled
[Tue Jan 28 08:08:04.170793 2020] [lbmethod_heartbeat:notice] [pid 4833] AH02282: No slotmem from mod_heartmonitor
[Tue Jan 28 08:08:04.170852 2020] [:warn] [pid 4833] mod_wsgi: Compiled for Python/3.6.2.
[Tue Jan 28 08:08:04.170856 2020] [:warn] [pid 4833] mod_wsgi: Runtime using Python/3.6.8.
[Tue Jan 28 08:08:04.173067 2020] [mpm_prefork:notice] [pid 4833] AH00163: Apache/2.4.41 (Amazon) mod_wsgi/3.5 Python/3.6.8 configured -- resuming normal operations
[Tue Jan 28 08:08:04.173089 2020] [core:notice] [pid 4833] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
[Tue Jan 28 08:25:28.783035 2020] [mpm_prefork:notice] [pid 4833] AH00169: caught SIGTERM, shutting down
[Tue Jan 28 08:25:32.859422 2020] [suexec:notice] [pid 5573] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Tue Jan 28 08:25:32.875584 2020] [so:warn] [pid 5573] AH01574: module wsgi_module is already loaded, skipping
[Tue Jan 28 08:25:32.877541 2020] [http2:warn] [pid 5573] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.
[Tue Jan 28 08:25:32.877552 2020] [http2:warn] [pid 5573] AH02951: mod_ssl does not seem to be enabled
[Tue Jan 28 08:25:32.878103 2020] [lbmethod_heartbeat:notice] [pid 5573] AH02282: No slotmem from mod_heartmonitor
[Tue Jan 28 08:25:32.878167 2020] [:warn] [pid 5573] mod_wsgi: Compiled for Python/3.6.2.
[Tue Jan 28 08:25:32.878174 2020] [:warn] [pid 5573] mod_wsgi: Runtime using Python/3.6.8.
[Tue Jan 28 08:25:32.880448 2020] [mpm_prefork:notice] [pid 5573] AH00163: Apache/2.4.41 (Amazon) mod_wsgi/3.5 Python/3.6.8 configured -- resuming normal operations
[Tue Jan 28 08:25:32.880477 2020] [core:notice] [pid 5573] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
[Wed Jan 29 01:11:07.166917 2020] [mpm_prefork:notice] [pid 5573] AH00169: caught SIGTERM, shutting down
Exception ignored in: <bound method BaseEventLoop.__del__ of <_UnixSelectorEventLoop running=False closed=False debug=False>>
Traceback (most recent call last):
  File "/usr/lib64/python3.6/asyncio/base_events.py", line 526, in __del__
NameError: name 'ResourceWarning' is not defined
[Wed Jan 29 01:11:08.333254 2020] [suexec:notice] [pid 28706] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Wed Jan 29 01:11:08.349662 2020] [so:warn] [pid 28706] AH01574: module wsgi_module is already loaded, skipping
[Wed Jan 29 01:11:08.351804 2020] [http2:warn] [pid 28706] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.
[Wed Jan 29 01:11:08.351813 2020] [http2:warn] [pid 28706] AH02951: mod_ssl does not seem to be enabled
[Wed Jan 29 01:11:08.352386 2020] [lbmethod_heartbeat:notice] [pid 28706] AH02282: No slotmem from mod_heartmonitor
[Wed Jan 29 01:11:08.352447 2020] [:warn] [pid 28706] mod_wsgi: Compiled for Python/3.6.2.
[Wed Jan 29 01:11:08.352451 2020] [:warn] [pid 28706] mod_wsgi: Runtime using Python/3.6.8.
[Wed Jan 29 01:11:08.354766 2020] [mpm_prefork:notice] [pid 28706] AH00163: Apache/2.4.41 (Amazon) mod_wsgi/3.5 Python/3.6.8 configured -- resuming normal operations
[Wed Jan 29 01:11:08.354783 2020] [core:notice] [pid 28706] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'

如果有人可以提供一些见解/帮助/进一步的步骤，将不胜感激。我可以提供更多日志等任何其他有用的信息。谢谢。

【问题讨论】：

我不确定，也许你可以试试 Debug True 看看是什么错误。

这似乎与您的wsgi 或asgi 模块有关。您是否使用gunicorn 或类似的方式运行您的 django 工作人员？如果你使用gunicorn，你是在使用同步工作者还是异步的，比如gevent？

【参考方案1】：

您可以尝试在您的 ec2 上安装 ssl 模块：sudo yum install mod_ssl 解决您的 httpd 问题。

此外，如果您使用的是负载均衡器，您可能需要检查目标的运行状况。当运行状况检查失败时，您会收到 500 个错误。

【讨论】：

不幸的是，这并没有做任何事情。尝试加载我的网站时，我仍然收到 500 错误。

究竟是什么错误？是503还是502？或者是其他东西？此外，当您点击 url 时，您可能希望在浏览器上检查您的页面。

字面意思是“服务器错误 (500)”。

Well 500 通常指定内部服务器错误。您可能想检查您的代码是否有任何异常。也许你可以放一个 try..except 块并以这种方式调试它。

【参考方案2】：

从你的日志来看，我认为这是罪魁祸首：

Exception ignored in: <bound method BaseEventLoop.__del__ of <_UnixSelectorEventLoop running=False closed=False debug=False>>
Traceback (most recent call last):
  File "/usr/lib64/python3.6/asyncio/base_events.py", line 526, in __del__

我检查了文件/usr/lib64/python3.6/asyncio/base_events.py，发现类似这样的内容：

    def __del__(self):
        if not self.is_closed():
            warnings.warn(f"unclosed event loop self!r", ResourceWarning,
                          source=self)
            if not self.is_running():
                self.close()

似乎您在没有调用 close 之前就删除了事件循环。

（ResourceWarning 是一个内置类，我不知道为什么它是未定义的）