lxc2host.py

#! /usr/bin/env python3

"""
	Print IP's of LXC containers in a hostfile compatible way.
	by Hendrik 'Sharky' Schumann - https://schumann.pw/
"""

import os, sys

LXC_PATH = r'/var/lib/lxc/'

def fetch_ips(container):
	container_dir = os.path.join(LXC_PATH, container)
	ips = []
	with open(os.path.join(container_dir, 'config'), 'r') as f:
		lines = f.readlines()
		for line in lines:
			if 'lxc.network.ipv' in line and not 'gateway' in line:
				ipnet = line.split(' = ')[1]
				ip = ipnet[:ipnet.index('/')]
				#netmask = ipnet[ipnet.index('/'):]
				ips.append(ip)
	return ips

def find_containers():
	alldirs = os.listdir(LXC_PATH)
	allcontainers = []
	for d in alldirs:
		if os.path.isdir(os.path.join(LXC_PATH, d)):
			allcontainers.append(d)
	return allcontainers

def main(argv):
	ipcon = []
	for container in find_containers():
		ips = fetch_ips(container)
		ipcon.append(dict(container=container, ips=ips))
	
	for container in ipcon:
		for ip in container['ips']:
			print(("%s\t%s" % (ip, container['container'])).expandtabs(30))
	

if __name__ == '__main__':
	main(sys.argv)