Executing reboot command over SSH using Paramiko

Question

I use Paramiko for establishing SSH connection with some target device and I want to execute reboot command.

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(zip_hostname, username=username, password=password, timeout=1)
try:
    stdin, stdout, stderr = ssh.exec_command("/sbin/reboot -f")
    # .........
    # some code
    # .........
except AuthenticationException, e:
    print ''
finally:
    ssh.close()

But after executing ssh.exec_command("/sbin/reboot -f") "some code" does not execute because program is stuck in exec_command (the disconnection takes place caused by rebooting). What should I do to solve my problem?

Answer 1

Try this:

ssh.exec_command("/sbin/reboot -f > /dev/null 2>&1 &")

All the output of reboot is redirected to /dev/null to make it produce no output and it is started in the background thanks to the '&' sign in the end. Hopefully the program won't hang on that line this way, because the remote shell gives the prompt back.

Answer 2

All you need to do is to call channel.exec_command() instead of the high-level interface client.exec_command()

# exec fire and forget
timeout=0.5
transport = ssh.get_transport()
chan = ssh.get_transport().open_session(timeout=timeout)
chan.settimeout(timeout)
try:
  chan.exec_command(command)
except socket.timeout:
  pass