我一直在尝试让 SaltStack 与 IPMI 一起工作，查看源代码我看到 ipmi 模块使用pythons pyghmi，无论我尝试什么，我总是会收到以下错误：
Insufficient resources to create new session (wait for existing sessions to timeout)
但是，从命令行（使用相同的用户名和密码）使用 ipmitool 可以正常工作，我能够连接和执行命令。
我也试过一个简单的python脚本：
from pyghmi.ipmi.private import session
def _onlogon(response):
if 'error' in response:
raise Exception(response['error'])
s = session.Session(bmc='10.0.0.100',
userid='USER',
password='PASS',
onlogon=_onlogon)
但这失败并出现相同的错误（尝试使用 python 2.7 和 3.5）：
Traceback (most recent call last):
File "/tmp/pycharm_project_858/main.py", line 15, in <module>
s.wait_for_rsp(timeout=1)
File "/usr/local/lib/python2.7/dist-packages/pyghmi/ipmi/private/session.py", line 1103, in wait_for_rsp
relsession.process_pktqueue()
File "/usr/local/lib/python2.7/dist-packages/pyghmi/ipmi/private/session.py", line 1194, in process_pktqueue
self._handle_ipmi_packet(pkt[0], sockaddr=pkt[1], qent=pkt)
File "/usr/local/lib/python2.7/dist-packages/pyghmi/ipmi/private/session.py", line 1261, in _handle_ipmi_packet
self._handle_ipmi2_packet(data)
File "/usr/local/lib/python2.7/dist-packages/pyghmi/ipmi/private/session.py", line 1283, in _handle_ipmi2_packet
return self._got_rmcp_response(data[16:])
File "/usr/local/lib/python2.7/dist-packages/pyghmi/ipmi/private/session.py", line 1363, in _got_rmcp_response
self.onlogon({'error': errstr})
File "/usr/local/lib/python2.7/dist-packages/pyghmi/ipmi/private/session.py", line 537, in onlogon
waiter(parameter)
File "/tmp/pycharm_project_858/main.py", line 6, in _onlogon
raise Exception(response['error'])
Exception: Insufficient resources to create new session (wait for existing sessions to timeout)
欢迎任何见解，不幸的是，我找不到任何关于 pyghmi 的文档。