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#!/usr/bin/env python
'''This runs some commands on a remote host using SSH.
At the prompts enter hostname, user, and password.
It works like this:
Login via SSH (This is the hardest part).
Run and parse 'uptime'.
Run 'iostat'.
Run 'vmstat'.
Run 'netstat'
Run 'free'.
Exit the remote host.
'''
import pexpect
import getpass
#
# Some constants. These are regular expressions.
#
TERMINAL_PROMPT = 'Terminal type?'
TERMINAL_TYPE = 'vt100'
COMMAND_PROMPT = '[$#] ' ### This is way too simple for industrial use :-) ...
# This is the prompt we get if SSH does not have
# the remote host's public key stored in the cache.
SSH_NEWKEY = 'Are you sure you want to continue connecting (yes/no)?'
PASSWORD_PROMPT_MYSQL = 'Enter password: '
print 'Enter the host that you wish to monitor.'
host = raw_input('Hostname: ')
user = raw_input('User: ')
password = getpass.getpass('Password: ')
password_mysql = getpass.getpass('MySQL Password [None]: ')
#
# Login via SSH
#
child = pexpect.spawn('ssh -l %s %s'%(user, host))
i = child.expect([pexpect.TIMEOUT, SSH_NEWKEY, 'password: '])
if i == 0: # Timeout
print 'ERROR!'
print 'SSH could not login. Here is what SSH said:'
print child.before, child.after
sys.exit (1)
if i == 1: # SSH does not have the public key. Just accept it.
child.sendline ('yes')
child.expect ('password: ')
child.sendline(password)
# Now we are either at the command prompt or
# the login process is asking for our terminal type.
i = child.expect ([COMMAND_PROMPT, TERMINAL_PROMPT])
if i == 1:
child.sendline (TERMINAL_TYPE)
child.expect (COMMAND_PROMPT)
#
# Now we should be at the command prompt and ready to run some commands.
#
print
print '---------------------------------------'
print 'Report of commands run on remote host.'
# Run and parse 'uptime'.
child.sendline ('uptime')
child.expect ('up ([0-9]+) days?,.*?,\s+([0-9]+) users?,\s+load averages?: ([0-9]+\.[0-9][0-9]), ([0-9]+\.[0-9][0-9]), ([0-9]+\.[0-9][0-9])')
duration, users, av1, av5, av15 = child.match.groups()
print
print 'Uptime: %s days, %s users, %s (1 min), %s (5 min), %s (15 min)' % (
duration, users, av1, av5, av15)
child.expect (COMMAND_PROMPT)
# Run iostat.
child.sendline ('iostat')
child.expect (COMMAND_PROMPT)
print
print child.before
# Run vmstat.
child.sendline ('vmstat')
child.expect (COMMAND_PROMPT)
print
print child.before
# Run netstat
child.sendline ('netstat')
child.expect (COMMAND_PROMPT)
print
print child.before
# Run free.
child.sendline ('free') # Linux systems only.
child.expect (COMMAND_PROMPT)
print
print child.before
# Run df.
child.sendline ('df')
child.expect (COMMAND_PROMPT)
print
print child.before
# Run MySQL show status.
child.sendline ('mysql -p -e "SHOW STATUS;"')
child.expect (PASSWORD_PROMPT_MYSQL)
child.sendline (password_mysql)
child.expect (COMMAND_PROMPT)
print
print child.before
# Now exit the remote host.
child.sendline ('exit')
child.expect(pexpect.EOF)
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