Wait until paramiko exec_command is finished

Question

I've got a python script I'm trying to install a rpm package on but when I send the command to install it doesn't wait for the command to finish before restarting the service. I've read a lot of forums about using recv_exit_status() but I don't think I'm using it right.

This is what I have:

#!/usr/bin/python

import paramiko, os
from getpass import getpass

# Setting Variables 
Hosts = [ '192.168.1.1', '192.168.1.2'] #IPs changed for posting
username = 'root'
print 'Enter root password on remote computer:'
password = getpass()
port = 22
File = 'Nessus-6.11.2-es7.x86_64.rpm'

for host in Hosts:
    print 'Finished copying files. Now executing on remote computer'

    #Setting up SSH session to run commands
    remote_client = paramiko.SSHClient()
    remote_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    remote_client.connect(host, username=username, password=password)

    InstallNessus = 'rpm -U --percent %s'%File
    stdin, stdout, stderr = remote_client.exec_command(InstallNessus)
    stdout.channel.recv_exit_status()
    lines = stdout.readlines()
    for line in lines:
        print line
    stdin, stdout, stderr = remote_client.exec_command('systemctl restart nessusd.service')

    remote_client.close()

I've tried using Fabric but I seem to be messing up my syntax somewhere.

See also Wait to finish command executed with Python Paramiko. — Martin Prikryl
– Martin Prikryl, Commented Apr 12, 2021 at 9:52

user29913244 · Accepted Answer · 2025-03-07 15:15:18Z

2

Add get_pty=True This will wait until command execution completed.

stdin,stdout,stderr = self.ssh.exec_command(command,get_pty=True)

But be aware that this will combine the returned stdout and stderr: https://github.com/paramiko/paramiko/issues/1142

edited Mar 7 at 15:15

user29913244

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answered Jan 24, 2019 at 13:46

Jeevan Chaitanya

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Comments

danny · Accepted Answer · 2017-11-13 13:55:19Z

1

It's channel.recv_exit_status(), not stdout.channel.recv_exit_status().

However, since you are trying to run the same command over many servers, something like parallel-ssh is a better fit and much faster than paramiko, both sequentially and in parallel.

Code to do it is also much simpler, just:

from pssh.pssh2_client import ParallelSSHClient

hosts = ['192.168.1.1', '192.168.1.2']
_file = 'Nessus-6.11.2-es7.x86_64.rpm'
cmd = 'rpm -U --percent %s' % _file

client = ParallelSSHClient(hosts, user='<user>', password='<password>')

output = client.run_command(cmd)
for host, host_output in output.items():
    for line in host_output.stdout:
        print "Host %s: %s" % (host, line)
    print "Host %s exit code %s" % (host, host_output.exit_code)

restart_out = client.run_command('systemctl restart nessusd.service')
# Just wait for completion
client.join(restart_out)

See documentation for further information.

answered Nov 13, 2017 at 13:55

danny

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3 Comments

Jeremy Livingston Over a year ago

Using what you posted but it seems to be doing the same. The script doesn't seem to wait for the rpm install to finish. I only get output of "Host 192.168.1.1 exit code 0". I'll keep looking through the documentation though.

danny Over a year ago

Test your command first. If there is no output the command may not have executed or exited with nothing to do, eg if the RPM is already installed.

Jeremy Livingston Over a year ago

I'm such a noob. I just realized I didn't put the full path in my file variable. I think that was my issue on all of my scripts.

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