Building Python Script to test if servers are offline-CodePudding

I am new to python so forgive my ignorance. I am trying to build a script to find and remove servers that have been removed from DNS vs servers that still resolve.

The issue I am having is I know the function will error out on servers with no DNS. How do separate the 2 into different buckets

servers = open("test2.txt", 'r')

for server in servers:

try:

    result = socket.gethostbyname(server)

    break

except Exception:

    print("No DNS")

else:

    print(server)

CodePudding user response：

You could make two lists, one for each and with try except looping until the end of file. Txt file needs to be formatted as such that there is 1 ip address per line, and then we add servers with no DNS entry into unresolved with the exception. For example try this

import socket

resolved_servers = []
unresolved_servers = []

path = "C:/temp/servers.txt"
servers = open(path, 'r')

for server in servers:
    try:
        result = socket.gethostbyname(server)
        resolved_servers.append(server)
    except Exception:
        unresolved_servers.append(server)

print("Resolved servers:", resolved_servers)
print("Unresolved servers:", unresolved_servers)