Python script automation

Dev Shed Forums Sponsor:

January 19th, 2013, 09:46 AM

hrp2010

Registered User

Join Date: Jan 2013

Posts: 5

Time spent in forums: 2 h 1 m 42 sec
Reputation Power: 0

Python script automation

Need help sith pyton script for auto installation of RPM on number of redhat servers.

so far i was successfully able to copy rpm/directory to single redhat server. i wants to know how we can transfer it to multiple server and upon transfer i can i install rpm and edit file ?

#!/usr/bin/python
import os
os.system("scp -r xyz root@hostname:/root")

above will copy xyz directory to single host.

hints or conceptual idea would be greatly appericated.

thank you

January 19th, 2013, 11:30 AM

b49P23TIvg

Contributing User

Join Date: Aug 2011

Posts: 3,458

Time spent in forums: 1 Month 2 Weeks 4 Days 6 h 33 m 33 sec
Reputation Power: 403

I'd use bash, not python.
I'm sure you can
read
hostnames from a file as well.

man bash

Code:

for h in host1 host2 
do
  scp -r xyz root@$h:/root
done

If you must have python, roughly

Code:

import os
hostnames = populate(a_file)  # list from a file
for host in hostnames:
    os.system("scp -r xyz root@{}:/root".format(host))

__________________
[code]Code tags[/code] are essential for python code!

January 19th, 2013, 03:15 PM

hrp2010

Registered User

Join Date: Jan 2013

Posts: 5

Time spent in forums: 2 h 1 m 42 sec
Reputation Power: 0

Thank you very much for your quick response. I tested but
i am getting below error message while running as per you recommendation.

did we need to import module related to "populate" ? If so what is that ?

Traceback (most recent call lst):
File "./xyz.py, line 3,in <module>
hostnames=populate(a_file)
NameError: name 'populate' is not defined.

Also my ultimate goal is after i copy directories on various servers, that directory contains couple rpm's which i need to install on each server, open a specific file and search for word an xyz="xyz" and replace "xyz" with "hostname" and another line in the same file, starting with ddd="sss" and replace "sss" with "hostname" , restart deamons by /etc/init.d/xyz restart

your help is very much appericated.
thank you

January 19th, 2013, 04:01 PM

b49P23TIvg

Contributing User

Join Date: Aug 2011

Posts: 3,458

Time spent in forums: 1 Month 2 Weeks 4 Days 6 h 33 m 33 sec
Reputation Power: 403

You're supposed to write populate. I presume your list of host names is in a file. You'd read the file into a list.

Suppose your hosts are a b and c.

def populate():

return ['a','b','c']

would work.

January 20th, 2013, 04:53 PM

hrp2010

Registered User

Join Date: Jan 2013

Posts: 5

Time spent in forums: 2 h 1 m 42 sec
Reputation Power: 0

does not work. do you mind putting newly advised code with explanation ? thank you. a_file is where i am putting all hostnames. i found that if i use as below to copy directory to a multiple systems but i would like to avoide that as i like concept of reading all hosts from a single file and script read that file in order to login and than copy.
os.system("scp -r xyz root@hostname:/root")
s.system("scp -r xyz root@hostname1:/root")

Also after directory being copied, i can i go to that xyz directory and run "rpm -ivh xyz.rpm" ( install a package ) or multiple commands like that ?

thank you

January 20th, 2013, 09:01 PM

b49P23TIvg

Contributing User

Join Date: Aug 2011

Posts: 3,458

Time spent in forums: 1 Month 2 Weeks 4 Days 6 h 33 m 33 sec
Reputation Power: 403

Code:

def populate():
    with open('a_file','r') as inf:
        hostnames = inf.readlines()
    return [host.strip() for host in hostnames]

For the other question, you can run ssh . You can run ssh from python. I still don't know why this extra python layer is useful.

Python script automation

Developer Shed Advertisers and Affiliates