Add router daemon
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222
router-daemon/pvcrd/Daemon.py
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222
router-daemon/pvcrd/Daemon.py
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#!/usr/bin/env python3
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# Daemon.py - PVC hypervisor router daemon
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import kazoo.client
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import sys
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import os
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import signal
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import socket
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import psutil
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import configparser
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import time
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import daemon_lib.ansiiprint as ansiiprint
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import daemon_lib.zkhandler as zkhandler
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import pvcrd.VXNetworkInstance as VXNetworkInstance
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print(ansiiprint.bold() + "pvcrd - Parallel Virtual Cluster router daemon" + ansiiprint.end())
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# Get the config file variable from the environment
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try:
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pvcrd_config_file = os.environ['PVCRD_CONFIG_FILE']
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except:
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print('ERROR: The "PVCRD_CONFIG_FILE" environment variable must be set before starting pvcrd.')
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exit(1)
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myhostname = socket.gethostname()
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myshorthostname = myhostname.split('.', 1)[0]
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mydomainname = ''.join(myhostname.split('.', 1)[1:])
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# Config values dictionary
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config_values = [
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'zookeeper',
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'vni_dev',
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'vni_dev_ip',
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]
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def readConfig(pvcrd_config_file, myhostname):
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print('Loading configuration from file {}'.format(pvcrd_config_file))
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o_config = configparser.ConfigParser()
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o_config.read(pvcrd_config_file)
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config = {}
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try:
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entries = o_config[myhostname]
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except:
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try:
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entries = o_config['default']
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except:
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print('ERROR: Config file is not valid!')
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exit(1)
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for entry in config_values:
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try:
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config[entry] = entries[entry]
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except:
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try:
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config[entry] = o_config['default'][entry]
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except:
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print('ERROR: Config file missing required value "{}" for this host!'.format(entry))
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exit(1)
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return config
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config = readConfig(pvcrd_config_file, myhostname)
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zk_conn = kazoo.client.KazooClient(hosts=config['zookeeper'])
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try:
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print('Connecting to Zookeeper instance at {}'.format(config['zookeeper']))
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zk_conn.start()
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except:
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print('ERROR: Failed to connect to Zookeeper!')
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exit(1)
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# Handle zookeeper failures gracefully
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def zk_listener(state):
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global zk_conn
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if state == kazoo.client.KazooState.SUSPENDED:
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ansiiprint.echo('Connection to Zookeeper list; retrying', '', 'e')
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while True:
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_zk_conn = kazoo.client.KazooClient(hosts=config['zookeeper'])
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try:
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_zk_conn.start()
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zk_conn = _zk_conn
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break
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except:
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time.sleep(1)
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elif state == kazoo.client.KazooState.CONNECTED:
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ansiiprint.echo('Connection to Zookeeper started', '', 'o')
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else:
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pass
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zk_conn.add_listener(zk_listener)
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# Cleanup function
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def cleanup(signum, frame):
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ansiiprint.echo('Terminating daemon', '', 'e')
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# Close the Zookeeper connection
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try:
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zk_conn.stop()
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zk_conn.close()
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except:
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pass
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# Exit
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exit(0)
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# Handle signals with cleanup
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signal.signal(signal.SIGTERM, cleanup)
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signal.signal(signal.SIGINT, cleanup)
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signal.signal(signal.SIGQUIT, cleanup)
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# What this daemon does:
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# 1. Configure public networks dynamically on startup (e.g. bonding, vlans, etc.) from config
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# * no /etc/network/interfaces config for these - just mgmt interface via DHCP!
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# 2. Watch ZK /networks
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# 3. Provision required network interfaces when a network is added
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# a. create vxlan interface targeting local dev from config
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# b. create bridge interface
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# c. add vxlan to bridge
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# d. set interfaces up
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# e. add corosync config for virtual gateway IP
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# 4. Remove network interfaces when network disapears
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# Zookeeper schema:
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# networks/
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# <VXLANID>/
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# ipnet <NETWORK-CIDR> e.g. 10.101.0.0/24
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# gateway <IPADDR> e.g. 10.101.0.1 [1]
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# dhcp <YES/NO> e.g. YES [2]
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# reservations/
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# <HOSTNAME/DESCRIPTION>/
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# address <IPADDR> e.g. 10.101.0.30
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# mac <MACADDR> e.g. ff:ff:fe:ab:cd:ef
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# fwrules/
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# <RULENAME>/
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# description <DESCRIPTION> e.g. Allow HTTP from any to this net
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# src <HOSTNAME/IPADDR/SUBNET/"any"/"this"> e.g. any
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# dest <HOSTNAME/IPADDR/SUBNET/"any"/"this"> e.g. this
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# port <PORT/RANGE/"any"> e.g. 80
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# Notes:
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# [1] becomes a VIP between the pair of routers in multi-router envs
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# [2] enables or disables a DHCP subnet definition for the network
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# Prepare underlying interface
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if config['vni_dev_ip'] == 'dhcp':
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vni_dev = config['vni_dev']
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ansiiprint.echo('Configuring VNI parent device {} with DHCP IP'.format(vni_dev), '', 'o')
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os.system(
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'ip link set {0} up'.format(
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vni_dev
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)
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)
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os.system(
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'dhclient {0}'.format(
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vni_dev
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)
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)
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else:
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vni_dev = config['vni_dev']
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vni_dev_ip = config['vni_dev_ip']
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ansiiprint.echo('Configuring VNI parent device {} with IP {}'.format(vni_dev, vni_dev_ip), '', 'o')
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os.system(
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'ip link set {0} up'.format(
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vni_dev
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)
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)
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os.system(
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'ip address add {0} dev {1}'.format(
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vni_dev_ip,
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vni_dev
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)
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)
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# Prepare VNI list
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t_vni = dict()
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vni_list = []
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@zk_conn.ChildrenWatch('/networks')
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def updatenetworks(new_vni_list):
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global vni_list
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print(ansiiprint.blue() + 'Network list: ' + ansiiprint.end() + '{}'.format(' '.join(new_vni_list)))
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# Add new VNIs
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for vni in new_vni_list:
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if vni not in vni_list:
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vni_list.append(vni)
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t_vni[vni] = VXNetworkInstance.VXNetworkInstance(vni, zk_conn, config)
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t_vni[vni].provision()
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# Remove deleted VNIs
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for vni in vni_list:
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if vni not in new_vni_list:
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vni_list.remove(vni)
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t_vni[vni].deprovision()
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# Tick loop
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while True:
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try:
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time.sleep(0.1)
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except:
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break
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