Comments (3)
t-cas
commented on July 19, 2024
this is not the expected behavior, a session remains opened until:
- you explicitely call
closeonSSHSessioninstance SSHSessioninstance is garbage collected- underlying ssh connection is closed by remote host (so
SSHSessionbecomes inactive)
see several tests in which we call multiple successive run_cmd on a single SSHSession instance: https://github.com/AmadeusITGroup/JumpSSH/blob/master/tests/test_session.py#L127
If you are not in one of those cases, please provide a code example having this issue so that we can troubleshoot further.
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mohsen1565
commented on July 19, 2024
Hi.
Thank you for your quick response.
Consider the following code:
from jumpssh import SSHSession
jumHostPassword='MyPass'
jumHostUsername='MyUser'
EndDeviceUsename='MyUser'
EndDevicePassword='MyPass'
gateway_session = SSHSession('MyHost', jumHostUsername, private_key_file=
'/home/d806848/.ssh/Identity_rsa', password='Mypassphrase').open()
remote_session = gateway_session.get_remote_session('MyRouter',
username=EndDeviceUsename,
password=EndDevicePassword)
print(remote_session.get_cmd_output('show interfaces Te3/6.319 | i bia'))
#remote_session.close()
#remote_session = gateway_session.get_remote_session('MyRouter',
username=EndDeviceUsename, password=EndDevicePassword)
print(remote_session.get_cmd_output('show standby Te3/6.319 | i Active
virtual MAC'))
If I run the code, only the first print command will execute:
Hardware is C7600 10Gb 802.3, address is 0024.142c.96c0 (bia
0024.142c.96c0) Traceback (most recent call last): File "test.py", line 11,
in <module> print(remote_session.get_cmd_output('show standby Te3/6.319 | i
Active virtual MAC')) File
"/home/d806848/mpls_impv/mplsAddrEnv/lib/python3.6/site-packages/jumpssh/session.py",
line 407, in get_cmd_output return self.run_cmd(cmd=cmd, **kwargs).output
File
"/home/d806848/mpls_impv/mplsAddrEnv/lib/python3.6/site-packages/jumpssh/session.py",
line 284, in run_cmd channel = self.ssh_transport.open_session() File
"/home/d806848/mpls_impv/mplsAddrEnv/lib/python3.6/site-packages/paramiko/transport.py",
line 767, in open_session timeout=timeout) File
"/home/d806848/mpls_impv/mplsAddrEnv/lib/python3.6/site-packages/paramiko/transport.py",
line 891, in open_channel raise e File
"/home/d806848/mpls_impv/mplsAddrEnv/lib/python3.6/site-packages/paramiko/transport.py",
line 1909, in run ptype, m = self.packetizer.read_message() File
"/home/d806848/mpls_impv/mplsAddrEnv/lib/python3.6/site-packages/paramiko/packet.py",
line 426, in read_message header = self.read_all(self.__block_size_in,
check_rekey=True) File
"/home/d806848/mpls_impv/mplsAddrEnv/lib/python3.6/site-packages/paramiko/packet.py",
line 276, in read_all raise EOFError() EOFError
However if I close and reestablish the connection to the remote host, it
will then start to work:
from jumpssh import SSHSession
jumHostPassword='MyPass'
jumHostUsername='MyUser'
EndDeviceUsename='MyUser'
EndDevicePassword='MyPass'
gateway_session = SSHSession('MyHost', jumHostUsername, private_key_file=
'/home/d806848/.ssh/Identity_rsa', password='MyPassphrase').open()
remote_session = gateway_session.get_remote_session('MyRouter',
username=EndDeviceUsename,
password=EndDevicePassword)
print(remote_session.get_cmd_output('show interfaces Te3/6.319 | i bia'))
remote_session.close()
remote_session = gateway_session.get_remote_session('MyRouter',
username=EndDeviceUsename,
password=EndDevicePassword)
print(remote_session.get_cmd_output('show standby Te3/6.319 | i Active
virtual MAC'))
Which runs fine:
(mplsAddrEnv) d806848@nebula-07:~/mpls_impv$ python test.py Hardware is
C7600 10Gb 802.3, address is 0024.142c.96c0 (bia 0024.142c.96c0) Active
virtual MAC address is 0000.0c07.ace0 (mplsAddrEnv) d806848@nebula-07
:~/mpls_impv$
I'm not sure why it does not allow consecutive execution of commands.
Regards,
…On Fri, Nov 9, 2018 at 7:03 PM Thibaud Castaing ***@***.***> wrote:
this is not the expected behavior, a session remains opened until:
- you explicitely call close on SSHSession instance
- SSHSession instance is garbage collected
- underlying ssh connection is closed by remote host (so SSHSession
becomes inactive)
see several tests in which we call multiple successive run_cmd on a
single SSHSession instance:
https://github.com/AmadeusITGroup/JumpSSH/blob/master/tests/test_session.py#L127
If you are not in one of those cases, please provide a code example having
this issue so that we can troubleshoot further.
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t-cas
commented on July 19, 2024
From what I can see looking a bit around, this seems to be a common issue with Cisco devices that apparently only allow one exec command execution per connection:
- https://stackoverflow.com/questions/48229181/paramiko-exec-command-with-multiple-commands-on-cisco-router-not-providing-any-o
- https://stackoverflow.com/questions/8151107/paramiko-failed-to-re-use-ssh-session-when-connecting-to-cisco-c2960-switcher
if you don't have any issue with the latency introduced when reopening the session for each command, I think it will be the easiest approach.
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