[Bug 1321787] Re: Paramiko does not properly work with eventlet concurrency

[Chuck Short]

** Changed in: python-eventlet (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1321787

Title:
  Paramiko does not properly work with eventlet concurrency

Status in Ironic:
  Fix Released
Status in tripleo:
  Fix Released
Status in python-eventlet package in Ubuntu:
  Fix Released

Bug description:
  UPD(dtantsur): Old title: `ironic node-set-power-state off` fails
  during Tripleo deployment

  Tripleo deployment with Ironic, when it register baremetal nodes, with
  the following error

  + ironic node-set-power-state 1c55376d-19c5-473c-9c28-33e3c4549785 off
  SSH connection cannot be established: Failed to establish SSH connection to host 192.168.122.1. (HTTP 400)

  Here is the traceback from ironic-conductor.log

  2014-05-21 13:16:12.342 5073 ERROR paramiko.transport [-] Exception: Error reading SSH protocol bannerSecond simultaneous read on fileno 8 detected.  Unless you really know what you're
  doing, make sure that only one greenthread can read any particular socket.  Consider using a pools.Pool. If you do know what you're doing and want to disable this error, call eventlet.d
  ebug.hub_prevent_multiple_readers(False)
  2014-05-21 13:16:12.357 5073 ERROR paramiko.transport [-] Traceback (most recent call last):
  2014-05-21 13:16:12.357 5073 ERROR paramiko.transport [-]   File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/paramiko/transport.py", line 1412, in run
  2014-05-21 13:16:12.358 5073 ERROR paramiko.transport [-]     self._check_banner()
  2014-05-21 13:16:12.358 5073 ERROR paramiko.transport [-]   File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/paramiko/transport.py", line 1539, in _check_banner
  2014-05-21 13:16:12.358 5073 ERROR paramiko.transport [-]     raise SSHException('Error reading SSH protocol banner' + str(e))
  2014-05-21 13:16:12.358 5073 ERROR paramiko.transport [-] SSHException: Error reading SSH protocol bannerSecond simultaneous read on fileno 8 detected.  Unless you really know what you're doing, make sure that only one greenthread can read any particular socket.  Consider using a pools.Pool. If you do know what you're doing and want to disable this error, call eventlet.debug.hub_prevent_multiple_readers(False)
  2014-05-21 13:16:12.358 5073 ERROR paramiko.transport [-]
  Traceback (most recent call last):
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 346, in fire_timers
      timer()
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/eventlet/hubs/timer.py", line 56, in __call__
      cb(*args, **kw)
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/eventlet/greenthread.py", line 194, in main
      result = function(*args, **kwargs)
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/ironic/conductor/task_manager.py", line 92, in wrapper
      return f(*args, **kwargs)
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/ironic/conductor/utils.py", line 74, in node_power_action
      node.save(context)
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/ironic/openstack/common/excutils.py", line 82, in __exit__
      six.reraise(self.type_, self.value, self.tb)
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/ironic/conductor/utils.py", line 67, in node_power_action
      curr_state = task.driver.power.get_power_state(task, node)
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/ironic/drivers/modules/ssh.py", line 394, in get_power_state
      ssh_obj = _get_connection(node)
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/ironic/drivers/modules/ssh.py", line 250, in _get_connection
      return utils.ssh_connect(_parse_driver_info(node))
    File "/opt/stack/venvs/openstack/local/lib/python2.7/site-packages/ironic/common/utils.py", line 113, in ssh_connect
      raise exception.SSHConnectFailed(host=connection.get('host'))
  SSHConnectFailed: Failed to establish SSH connection to host 192.168.122.1.

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