Expectation:
When ssh_conn_timeout is set to N in cinder.conf,
keepalive packets are sent every N seconds.
Result:
No keepalive packets were sent.
Cause guessed:
In ssh_utils.py, set_timeout(None) is called.
But in paramiko/packet.py, the timeout seems to be needed
to trigger sending keep alive packet.
When I commented out set_timeout(None),
keepalive packets sent as expected.
cinder/cinder/ssh_utils.py:L145
{{{
if self.conn_timeout:
transport = ssh.get_transport()
transport.sock.settimeout(None)
transport.set_keepalive(self.conn_timeout)
}}}
paramiko/paramiko/packet.py:L249-279
{{{
while n > 0:
got_timeout = False
...
except socket.timeout:
got_timeout = True
...
if got_timeout:
...
self._check_keepalive()
}}}
Is this information/request is a bug or some feature enhancement, as the intent is not clear??