Python 古尼康<；HaltServer'；工作程序无法启动。'；由于缺乏虚拟机资源？

我读过类似标题的帖子，但似乎没有什么能解决我的问题。我们正在运行一个带有gunicorn、supervisor和nginx的django应用程序，现在已经运行了几个月，没有任何问题。今天早上，突然（我重复一遍！）我在尝试访问该站点的任何页面时遇到了一个

502错误网关

在调查之后，我发现gunicorn有错，如下面的gunicorn.err.log所示

Traceback (most recent call last):
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 209, in run
    self.sleep()
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 357, in sleep
    ready = select.select([self.PIPE[0]], [], [], 1.0)
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 242, in handle_chld
    self.reap_workers()
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 525, in reap_workers
    raise HaltServer(reason, self.WORKER_BOOT_ERROR)
gunicorn.errors.HaltServer: <HaltServer 'Worker failed to boot.' 3>

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/exo/bin/gunicorn", line 11, in <module>
    sys.exit(run())
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 58, in run
    WSGIApplication("%(prog)s [OPTIONS] [APP_MODULE]").run()
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/app/base.py", line 228, in run
    super().run()
 File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/app/base.py", line 72, in run
    Arbiter(self).run()
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 229, in run
    self.halt(reason=inst.reason, exit_status=inst.exit_status)
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 342, in halt
    self.stop()
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 393, in stop
    time.sleep(0.1)
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 242, in handle_chld
    self.reap_workers()
  File "/home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/arbiter.py", line 525, in reap_workers
    raise HaltServer(reason, self.WORKER_BOOT_ERROR)
gunicorn.errors.HaltServer: <HaltServer 'Worker failed to boot.' 3>

Inventory4是我的django目录，带有settings.py和wsgi.py

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'inventory4.settings')

application = get_wsgi_application()

这非常奇怪，因为我没有对我的项目配置进行任何修改

以下是django的外观：
settings.py：

WSGI_APPLICATION = 'inventory4.wsgi.application'

和wsgi.py

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'inventory4.settings')

application = get_wsgi_application()

然后在/etc/supervisor/conf.d/gunicorn.conf中：

directory=/home/ubuntu/exostocksaas
command=/home/ubuntu/exo/bin/gunicorn  --config /home/ubuntu/exo/lib/python3.6/site-packages/gunicorn/config.py --log-level debug --bind unix:/home/ubuntu/exostocksaas/app.sock inventory4.wsgi:application

autostart=true
autorestart=true
stderr_logfile=/var/log/gunicorn/gunicorn.err.log
stdout_logfile=/var/log/gunicorn/gunicorn.out.log


[group:guni]
programs:gunicorn

我不知道是什么导致了这个bug的出现，也不知道如何解决它