OSError: [Errno 11] Resource temporarily unavailable

Traceback (most recent call last):
  File "/home/kratos/local/bin/gunicorn", line 11, in
    sys.exit(run())
  File "/home/kratos/local/lib/python2.7/site-packages/gunicorn/app/wsgiapp.py", line 34, in run
    WSGIApplication("%(prog)s [OPTIONS] APP_MODULE").run()
  File "/home/kratos/local/lib/python2.7/site-packages/gunicorn/app/base.py", line 131, in run
    Arbiter(self).run()
  File "/home/kratos/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 173, in run
    self.manage_workers()
  File "/home/kratos/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 460, in manage_workers
    self.spawn_workers()
  File "/home/kratos/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 512, in spawn_workers
    self.spawn_worker()
  File "/home/kratos/local/lib/python2.7/site-packages/gunicorn/arbiter.py", line 474, in spawn_worker
    pid = os.fork()
  File "/home/kratos/local/lib/python2.7/site-packages/gevent/os.py", line 98, in fork
    result = _fork()

OSError: [Errno 11] Resource temporarily unavailable

解决方案：

1. vi /etc/security/limits.d/90-nproc.conf

*          soft    nproc     65535

2. 尝试关掉占用最多资源的进程。