在bokeh服务器上使用redis。权限被拒绝：'/bokehpids.json'

我正在尝试使用redis作为后端的supervisor运行bokeh server，启动时收到以下错误消息：

Traceback (most recent call last):
  File "/usr/share/nginx/test-status/flask/bin/bokeh-server", line 7, in <module>
    bokeh.server.run()
  File "/usr/share/nginx/test-status/flask/lib/python2.7/site-packages/bokeh/server/__init__.py", line 175, in run
    start_server(args)
  File "/usr/share/nginx/test-status/flask/lib/python2.7/site-packages/bokeh/server/__init__.py", line 179, in start_server
    start.start_simple_server(args)
  File "/usr/share/nginx/test-status/flask/lib/python2.7/site-packages/bokeh/server/start.py", line 54, in start_simple_server
    start_redis()
  File "/usr/share/nginx/test-status/flask/lib/python2.7/site-packages/bokeh/server/start.py", line 40, in start_redis
    save=redis_save)
  File "/usr/share/nginx/test-status/flask/lib/python2.7/site-packages/bokeh/server/services.py", line 81, in start_redis
    stdin=subprocess.PIPE
  File "/usr/share/nginx/test-status/flask/lib/python2.7/site-packages/bokeh/server/services.py", line 32, in __init__
    self.add_to_pidfile()
  File "/usr/share/nginx/test-status/flask/lib/python2.7/site-packages/bokeh/server/services.py", line 46, in add_to_pidfile
    with open(self.pidfilename, "w+") as f:
IOError: [Errno 13] Permission denied: '/bokehpids.json'

---

请注意，如果使用内存作为后端，我可以使用supervisor运行服务器，并且可以使用redis作为后端手动运行bokeh服务器。有人知道我应该更改的权限在哪里吗？

原来它试图访问根目录中的pidfile

我通过更改supervisor配置文件中的目录解决了此问题：

[program:bokeh]
...
    directory=/usr/share/nginx/test-status
...