how to execute python or bash script through ssh connection and get the return code

Question

I have a python file at the location \tmp\ this file print something and return with exit code 22. I'm able to run this script perfectly with putty but not able to do it with paramiko module.

this is my execution code

import paramiko    
def main():
    remote_ip = '172.xxx.xxx.xxx'
    remote_username = 'root'
    remote_password = 'xxxxxxx'
    remote_path = '/tmp/ab.py'
    sub_type = 'py' 
    commands = ['echo $?']
    ssh_client = paramiko.SSHClient()
    ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh_client.connect(remote_ip, username=remote_username,password=remote_password)
    i,o,e = ssh_client.exec_command('/usr/bin/python /tmp/ab.py') 
    print o.read(), e.read()
    i,o,e = ssh_client.exec_command('echo $?')
    print o.read(), e.read()


main()

this is my python script to be executed on remote machine

#!/usr/bin/python
import sys
print "hello world"
sys.exit(20)

I'm not able to understand what is actually wrong in my logic. Also when i do cd \tmp and then ls, i'll still be in root folder.

teegaar · Accepted Answer · 2013-12-24 13:47:36Z

3

The following example runs a command via ssh and then get command stdout, stderr and return code:

import paramiko

client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(hostname='hostname', username='username', password='password')

channel = client.get_transport().open_session()
command = "import sys; sys.stdout.write('stdout message'); sys.stderr.write(\'stderr message\'); sys.exit(22)"
channel.exec_command('/usr/bin/python -c "%s"' % command)
channel.shutdown_write()

stdout = channel.makefile().read()
stderr = channel.makefile_stderr().read()
exit_code = channel.recv_exit_status()

channel.close()
client.close()

print 'stdout:', stdout
print 'stderr:', stderr
print 'exit_code:', exit_code

hope it helps

answered Dec 24, 2013 at 13:47

teegaar

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1 Comment

Hemant Over a year ago

thanks for the idea. I've accomplish this by using the pipeline and redirect the output of of python script to a file and then read the script on next command.

itzhaki · Accepted Answer · 2013-12-19 13:09:40Z

0

Each time you run exec_command, a new bash subprocess is being initiated.

That's why when you run something like:

exec_command("cd /tmp");
exec_command("mkdir hello");

The dir "hello" is created in dir, and not inside tmp.

Try to run several commands in the same exec_command call.

A different way is to use python's os.chdir()

answered Dec 19, 2013 at 13:09

itzhaki

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Hemant Over a year ago

ok i understand that excec_command will not help me accomplish what i'm trying to do but why is my python/batch script is not running? Also if i anyhow i'm able to do so how would i get the exit code or return code of the script

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