A simple python script to generate ansible inventory host file.

ansible-random-inventory-generator.py

from netaddr import *
import argparse
import random
import string

CHAR_LIST = list(string.ascii_lowercase)


def word_generator(word_length):
    random_word = ''.join(random.choice(CHAR_LIST) for _ in range(word_length))
    return random_word


def inventory_generator(my_network,host_prefix,inventory_file_path):
    region_suffix_list = ['1a', '1b', '1c', '1d', '1e']
    group_line_range = 0
    counter = 0
    with open(inventory_file_path, 'w') as f:
        for each_ip in IPNetwork(my_network).iter_hosts():
            ip = str(each_ip)
            instance_name1 = word_generator(5)
            instance_name2 = word_generator(7)
            instance_number_suffix = random.randrange(30)
            instance_zone_suffix = random.choice(region_suffix_list)
            instance_final_name = host_prefix + '-' + instance_name1 + '-' + instance_name2 + '-' + str(instance_number_suffix) + '-' + instance_zone_suffix + '\n'
            current_line = '%s ht_name=%s' % (ip, instance_final_name)

            if group_line_range == 0:
                current_line = '[all]\n\n' + '[' + word_generator(7) + ']\n' + current_line
                group_line_range = random.randrange(3,30)
            if group_line_range == counter:
                counter = 0
                group_line_range = random.randrange(3,30)
                current_line = '\n\n[' + word_generator(7) + ']\n' + current_line
            else:
                counter += 1

            f.write(current_line)

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='A simple python script to generate ansible inventory')
    parser.add_argument("-n", "--network", help="Your IP Address Network. Defaults to: 192.168.1.0/24", default='192.168.1.0/24')
    parser.add_argument("-p", "--prefix", help="Prefix for each host name. Defaults to: dev", default='dev')
    parser.add_argument("-P", "--path", help="Path of the inventory file. Defaults to: ./my_ansible_hosts", default='my_ansible_hosts')
    args = parser.parse_args()

    inventory_generator(args.network,args.prefix,args.path)