通过ssh连接到服务器，检查是否安装了Chef，并记录未安装Chef的服务器

Question

I need to check a lot of servers if they have chef installed (Don't ask) I was trying to automate it instead of doing it manually. I have never used python before and I can't really test this until I go in tomorrow so was looking for some feed back if I am on the right track.I figure I dump all the IP address's into a text file, loop through it and save the ones that need to have chef installed.

import pxssh
import getpass
CheckIT = str("command not found")

for line in open('ServerList.txt','r').readlines():

try:                                                            
s = pxssh.pxssh()
hostname = raw_input('line ')
username = raw_input('username ')
password = getpass.getpass('password: ')
s.login (hostname, username, password)
s.sendline ('sudo su -')   # run a command
s.prompt()             # match the prompt
s.sendline ('chef-client')
s.prompt()
if CheckIT == readline(self,size=-1)
with open("ServersToUpdate.txt", "a") as myfile:
myfile.write(hostname)


except pxssh.ExceptionPxssh, e:
print "pxssh failed on login."
print str(e)

Answer 1

Okay, so you probably won't want to actually run Chef as part of this. Also never ever use sudo su - , to correct way to write that for the past 15 years has been sudo -i , but you don't need even that. Just run chef-client --version and if that fails, assume Chef isn't installed.