Yes that is possible. We just completed a MVP of a script (Python) run from Ansible for upgrades of our Expressway systems. I don’t have the commands at hand, but I can look it up a little later in the script.
This is a snippet of the script I mentioned before. I'm not the one that have developed the script, so I don't have any deep or first hand information on how it works, but hopefully you'll be of some help with it anyway.
import paramiko
import subprocess
import time
import os
from paramiko import ssh_exception
from scp import SCPClient
from distutils.version import StrictVersion
from src.utils.logger import *
# Initializing logger
console_logs = Logger(__name__).write_log()
class SshConnection:
def __init__(self, server, username, password, imagePath, imageVersion):
self.server = server
self.username = username
self.password = password
self.imagePath = imagePath
self.imageVersion = imageVersion
def open_ssh_connection(self):
if self.check_availability():
try:
console_logs.info(f'Connecting with {self.server}')
self.client = paramiko.client.SSHClient()
self.client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.client.connect(self.server, username=self.username, password=self.password)
self.scp = SCPClient(self.client.get_transport())
return self.client, f"Successfully connected with {self.server}"
except TimeoutError:
console_logs.exception(f"{self.server} seems to be offline.")
logging.exception(TimeoutError)
return False, "Time out error, server seems to be offline."
except ssh_exception.AuthenticationException:
console_logs.exception(f"{self.server} failed connection. Authentication exception.")
return False, "Unable to authenticate with provided credentials, please check Password State root credentials."
except ssh_exception.NoValidConnectionsError:
console_logs.exception(f"{self.server} failed connection. Authentication exception.")
logging.exception(ssh_exception.NoValidConnectionsError)
return False, "Multiple connection attempts were made and none succeeded."
else:
return False, f"Server seems to be offline."
def close_connections(self):
try:
self.client.close()
self.scp.close()
console_logs.info("SSH and SCP connections have been closed successfully.")
except Exception as e:
console_logs.info("Unable to close SSH and SCP connections. Check logs for further information.")
console_logs.exception(e)
def update_server(self, serverInstallPath):
console_logs.info("Transferring upgrade image to server. This may take several minutes...")
self.scp.put(self.imagePath, serverInstallPath)
sleeptime, waittime = 60, 6000
starttime = time.time()
console_logs.info("Checking if installation has been successfull, please wait...")
while time.time() - starttime < waittime:
stdin, stdout,stderr = self.client.exec_command("ls -l /tmp/install*")
response = stdout.read().decode()
if 'No such file or directory' in response:
console_logs.error('Installation has failed.')
console_logs.error('FAILED: {}\n{}'.format(self.server,response))
return False
if 'install-ok' in response:
console_logs.info('Successful installation on server {}'.format(self.server))
return True
console_logs.info(f"Installation still in progress, script will sleep for {sleeptime} seconds and allow installation progress to finish.")
time.sleep(sleeptime)
console_logs.info("Script has awaken and will check installation progress once again...")
console_logs.error('Installation has failed. Please check error logs for further details.')
console_logs.error('TIMEOUT: {}\n{}'.format(self.server,response))
return False
For more information have a look at this link to Git and this presentation (BRKCOC-2996) from Cisco Live.
