Glossary

SSH — a technology that makes it possible to manage operating systems on virtual machines securely.

Practice

COPYshell
1# Connecting to the virtual machine from the command line
2
3ssh -i <path_to_private_key> ubuntu@<public_dns>

COPYpython
1# The minimal Python script code
2
3#!/usr/bin/python
4
5if __name__ == "__main__":
6    # Code

COPYpython
1# Getting command line arguments
2
3arguments = sys.argv
4
5# Input parameters' format
6
7unixOptions = "s:e:"  # parameters in UNIX format
8gnuOptions = ["start=", "end="] # parameters in GNU format
9
10# Check whether input parameters match the format
11# indicated in unixOptions and gnuOptions
12try:
13    arguments, values = getopt.getopt(argumentList, unixOptions, gnuOptions)
14except getopt.error as err:
15    print (str(err))
16    sys.exit(2)      # Stop execution if input parameters are incorrect
17
18# Read the values from the string with input parameters
19
20start = ''
21end = ''
22for currentArgument, currentValue in arguments:
23    if currentArgument in ("-s", "--start"):
24        start = currentValue
25    elif currentArgument in ("-e", "--end"):
26        end = currentValue

COPYshell
1# Launching a Python script containing parameters
2
3python params_test.py --start='start' --end='end'

COPYshell
1# Transmitting a file to a virtual machine
2
3scp -i <path_to_private_key> <path_to_a_local_file> ubuntu@<public_dns>:

COPYshell
1# Calling cron schedule editor
2
3crontab -e