I have developed the following python script to help me upload NX-OS images to the Cisco Nexus switches.
The script is running just fine with small files. Tried with files under 100M and it's working fine. However I have also NX-OS images which are about 600M . At some point while script is running and the TFTP upload in in progress the upload stops when the file on the Cisco Employee Connection Insite: 205987840. The programs freezes and when I type show users in the cisco console I can see that the user used for upload is already disconnected.
I am thinking that maybe is something related to the ssh session timed out ? Or maybe something wrong in my script? I am new with python.
I am posting only relevant parts of the script:
def ssh_connect_no_shell(command):
global output
ssh_no_shell = paramiko.SSHClient()
ssh_no_shell.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh_no_shell.connect(device, port=22, username=myuser, password=mypass)
ssh_no_shell.exec_command('terminal length 0\n')
stdin, stdout, stder = ssh_no_shell.exec_command(command)
output = stdout.readlines()
ssh_no_shell.close()
def upload_file():
cmd_1 = "copy tftp:" + "//" + tftp_server + "/" + image + " " + "bootflash:" + " vrf " + my_vrf
ssh_connect_no_shell(cmd_1)
print '\n##### Device Output Start #####'
print '\n'.join(output)
print '\n##### Device Output End #####'
def main():
print 'Program starting...\n'
time.sleep(1)
variables1()
check_if_file_present()
check_if_enough_space()
upload_file()
check_file_md5sum()
are_you_sure(perform_upgrade)
perform_upgrade_and_reboot()
if __name__ == '__main__':
clear_screen()
main()
