Long-running ssh commands in python paramiko module (and how to end them)

by

Instead of calling exec_command on the client, get hold of the transport and generate your own channel. The channel can be used to execute a command, and you can use it in a select statement to find out when data can be read:

#!/usr/bin/env python
import paramiko
import select
client = paramiko.SSHClient()
client.load_system_host_keys()
client.connect('host.example.com')
transport = client.get_transport()
channel = transport.open_session()
channel.exec_command("tail -f /var/log/everything/current")
while True:
  rl, wl, xl = select.select([channel],[],[],0.0)
  if len(rl) > 0:
      # Must be stdout
      print channel.recv(1024)

The channel object can be read from and written to, connecting with stdout and stdin of the remote command. You can get at stderr by calling channel.makefile_stderr(...).

I’ve set the timeout to 0.0 seconds because a non-blocking solution was requested. Depending on your needs, you might want to block with a non-zero timeout.

More Related Contents:

  1. How to scp in Python?
  2. Some Unix commands fail with ” not found”, when executed using Python Paramiko exec_command
  3. Environment variable differences when using Paramiko
  4. Pass input/variables to command/script over SSH using Python Paramiko
  5. How to use Paramiko logging?
  6. Paramiko ssh die/hang with big output
  7. Nested SSH using Python Paramiko
  8. Running interactive commands in Paramiko
  9. Executing command using Paramiko exec_command on device is not working
  10. What is the difference between exec_command and send with invoke_shell() on Paramiko?
  11. Reading file opened with Python Paramiko SFTPClient.open method is slow
  12. Command executed with Paramiko does not produce any output
  13. Read a file from server with SSH using Python
  14. Port forwarding with Paramiko
  15. How to list all the folders and files in the directory after connecting through SFTP in Python
  16. SSH key generated by ssh-keygen is not recognized by Paramiko: “not a valid RSA private key file”
  17. Run multiple commands in different SSH servers in parallel using Python Paramiko
  18. Password authentication in Python Paramiko fails, but same credentials work in SSH/SFTP client
  19. Executing command using “su -l” in SSH using Python
  20. Execute command and wait for it to finish with Python Paramiko
  21. Implement an interactive shell over ssh in Python using Paramiko?
  22. How to run sudo with Paramiko? (Python)
  23. Paramiko authentication fails with “Agreed upon ‘rsa-sha2-512’ pubkey algorithm” (and “unsupported public key algorithm: rsa-sha2-512” in sshd log)
  24. Recursive directory download with Paramiko?
  25. How to create a SSH tunnel using Python and Paramiko?
  26. Paramiko: read from standard output of remotely executed command
  27. How can you get the SSH return code using Paramiko?
  28. List files on SFTP server matching wildcard in Python using Paramiko
  29. How to execute a script remotely in Python using SSH?
  30. python paramiko ssh

Leave a Comment