This script adds rules to the routing policy database

routing.py

#!/usr/bin/env python
# -*- encoding: utf-8; py-indent-offset: 4 -*-
#
# This script adds rules to the routing policy database
#
import ConfigParser
import os
import socket
import sys
from pyroute2 import IPRoute
config_file = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'routing.conf')
config = ConfigParser.RawConfigParser()
try:
    config.readfp(open(config_file))
except:
    print('Cannot read the config file %s' % config_file)
    sys.exit(1)
ip = IPRoute()
ipv4 = socket.AF_INET
rules = ip.get_rules(family=ipv4)
interfaces = {}
for k,v in [(x.get_attr('IFLA_IFNAME'), x['index']) for x in ip.get_links()]:
    interfaces[k] = v
for section in config.sections():
    if section not in interfaces.keys():
        continue
    try:
        table = int(config.get(section, 'table'))
        gw = config.get(section, 'gw')
        vip = config.get(section, 'vip').split(',')
    except:
        continue
    if not ip.get_routes(family=ipv4, table=table):
        ip.route('add', family=ipv4, gateway=gw, table=table)
        ip.route('add', family=ipv4, dst='127.0.0.0', oif=interfaces['lo'], dst_len=8, table=table)
    for ip_addr in vip:
        if not [x for x in rules if x.get_attr('RTA_TABLE') == table and x.get_attr('RTA_SRC') == ip_addr]:
            ip.rule('add', family=ipv4, src=ip_addr, table=table)