How to create a python script to ssh and run commands on multiple linux devices

Question

I’ve been scalping to find an explained python script to ssh to multiple Linux devices via ssh using paramiko. I found a few tweaked them and actually worked but i still cannot understand how it works.

Can someone please explain in the most appealing way how a python script to ssh to multiple Linux device and run commands works? Just as you would explain to a 6 year old. I mean I saw some scripts and they haver some complexity for no reason. I just wanted a Python script that imports a txt of hostnames and a another txt of commands and runs the same commands to all the Linux devices and returns the output. If someone could explain how such a script works I would be grateful.

ip = input("Please enter the hostname ")
user = ""
password = ""

print ("creating ssh")
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
print("please wait")
ssh_client.connect(hostname=ip, username=user, password=password)

cmd= "uname -r;pwd"
print("please wait")
sdtin,stdout,stderr = ssh_client.exec_command(cmd)
print("success")
stdout = stdout.readlines()
stdout = "".join(stdout)
print (stdout)

I want this but for multiple devices and getting the hostnames and commands from 2 separate files.

Asked By: rick_sorkin

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Answer 1

Turns out I’ve found the answer (the perfect script for what I want).
Here it is:

import paramiko
import time
p = paramiko.SSHClient()
cred = open("hostnames.csv","r")
for i in cred.readlines():
        line=i.strip()
        ls =line.split(",")
        print(ls[0])
        p.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        p.connect("%s"%ls[0],port =22, username = "%s"%ls[1], password="%s"%ls[2])
        stdin, stdout, stderr = p.exec_command('sudo pwd' , get_pty=True)
        stdin.write("%sn"%ls[2])
        stdin.flush()
        opt = stdout.readlines()
        opt ="".join(opt)
        print(opt)
cred.close()

So, it basically reads the csv file with is formatted as : hostname,username,password
and runs the script sequentially. Also, it can run sudo commands this way 🙂

Answered By: rick_sorkin

How to create a python script to ssh and run commands on multiple linux devices

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