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[Roman Podoliaka <rpodolyaka+bugs@xxxxxxxxxxxx>]

Public bug reported:

If DNS is configured on a node in a way, so that reverse DNS look ups
time out, noVNC will fail to connect to an instance with 'Connect
timeout' error.
    
The reverse DNS look up is done implicitly in BaseHTTPRequestHandler
(part of standard library), when logging a request. It's not
configurable, so the only way to disable it is to override the method
of the base class (https://github.com/python/cpython/blob/2.6/Lib/BaseHTTPServer.py#L487).
    
This is only true for the standard http server (used for novncproxy),
as the eventlet implementation (used for xvpvncproxy) seems to use
plain IP addresses without any reverse DNS look ups.

** Affects: nova
     Importance: Undecided
     Assignee: Roman Podoliaka (rpodolyaka)
         Status: In Progress

** Changed in: nova
       Status: New => In Progress

** Changed in: nova
     Assignee: (unassigned) => Roman Podoliaka (rpodolyaka)

** Summary changed:

- novncproxy fails to establish a VNC connection, if reverse DNS loop up times out
+ novncproxy fails to establish a VNC connection, if a reverse DNS look up times out

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1422315

Title:
  novncproxy fails to establish a VNC connection, if a reverse DNS look
  up times out

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  If DNS is configured on a node in a way, so that reverse DNS look ups
  time out, noVNC will fail to connect to an instance with 'Connect
  timeout' error.
      
  The reverse DNS look up is done implicitly in BaseHTTPRequestHandler
  (part of standard library), when logging a request. It's not
  configurable, so the only way to disable it is to override the method
  of the base class (https://github.com/python/cpython/blob/2.6/Lib/BaseHTTPServer.py#L487).
      
  This is only true for the standard http server (used for novncproxy),
  as the eventlet implementation (used for xvpvncproxy) seems to use
  plain IP addresses without any reverse DNS look ups.

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