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Commands used in Dockefile - Part4

  Docker is an opensource tool used for virtualization and deliver software in the form of packages called Containers. It is one of the most important tools used in networking domain.  Dockerfile  is a template for building the image which contains commands needed to package the software. In this post, I am going to explain the commands ADD & COPY used in  Dockerfile .   ADD Command:   ADD command is used to copy files, directories or files from remote URLS to destination path in the image. The source paths can contain wildcards.   If the destination has relative path, it is relative to the Working directory of the image. Note that source path is always relative to the Docker build context.   ADD command will not support authentication. So, if there are any protected files to be added in  Dockerfile  building, use other tools like curl or  wget   Dockerfile  copying Single & Multiple files, directory using ADD inst...
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Network Automation - Validation of IPV4 Address

In this post, I am going to teach you on how to validate the IPV4 address which is from “Practical Network Automation book”. There are two ways
  1. Building own logic
  2. Using the Library
Building own Logic:
First, let us see the validation of the IPV4 address using own logic. Generally, we know that IPV4 has four octets separated by dots. That means the IPV4 address has 3 dots and four octets separated by these dots and they are in the range of 0-255. So, we have to validate these two conditions in order to validate IPV4 address. Below is the script for this functionality.

def ip_validate(ip_address):
    #Check for the presence of four octets
    if(ip_addr.count(".") != 3):
        return False
    octets = ip_addr.split(".")
    #Check the range of each octet in the given input
    for each_octet in octets:
        try:
            if(int(each_octet) < 0 or int(each_octet) > 255):
                return False
        except:
            return False
    return True

#Take IP Address and pass it to function to validate
ip_addr = input("Enter an IP Address: ").strip() #Eliminate Extra spaces
ip_addr_flag = ip_validate(ip_addr)
#Based on the valiadation result from Validation function, Print message
if(ip_addr_flag):
    print("Correct IP Address")
else:
    print("IncorrectIP Address")
 Using the Socket Library:
There is an inbuilt socket library that can be used to validate the IPV4 address. If the IPV4 address is valid, it can be converted successfully using the inet_aton function of the socket library. Otherwise, it throws an exception stating that the IPV4 address is not valid. Below is the script for this functionality.

import socket
#Take IP Address and pass it to function to validate
ip_addr = input("Enter an IP Address: ").strip() #Eliminate Extra spaces
try:
    #Convert Dotted decimal representation to Binary format
    ip_addr_con = socket.inet_aton(ip_addr)
    print("IP Address is Valid")
except socket.error:
    print("Invalid IP Address")

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