# -- coding: utf-8 -- # Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you under the Apache License, Version 2.0 (the # "License"); you may not use this file except in compliance # with the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, # software distributed under the License is distributed on an # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY # KIND, either express or implied. See the License for the # specific language governing permissions and limitations # under the License. # -------------------------------------------------------------------- # # Notes # -------------------------------------------------------------------- # # Vrouter # # eth0 router gateway IP for isolated network # eth1 Control IP for hypervisor # eth2 public ip(s) # # VPC Router # # eth0 control interface # eth1 public ip # eth2+ Guest networks # -------------------------------------------------------------------- # import os import logging import CsHelper from CsFile import CsFile from CsProcess import CsProcess from CsApp import CsPasswdSvc from CsAddress import CsDevice from CsRoute import CsRoute from CsStaticRoutes import CsStaticRoutes import socket from time import sleep class CsRedundant(object): CS_RAMDISK_DIR = "/ramdisk" CS_PRIO_UP = 1 CS_PRIO_DOWN = -1 CS_ROUTER_DIR = "%s/rrouter" % CS_RAMDISK_DIR CS_TEMPLATES = [ "heartbeat.sh.templ", "check_heartbeat.sh.templ", "arping_gateways.sh.templ" ] CS_TEMPLATES_DIR = "/opt/cloud/templates" CONNTRACKD_BIN = "/usr/sbin/conntrackd" CONNTRACKD_KEEPALIVED_CONFLOCK = "/var/lock/conntrack.lock" CONNTRACKD_CONF = "/etc/conntrackd/conntrackd.conf" RROUTER_LOG = "/var/log/cloud.log" KEEPALIVED_CONF = "/etc/keepalived/keepalived.conf" def __init__(self, config): self.cl = config.cmdline() self.address = config.address() self.config = config def set(self): logging.debug("Router redundancy status is %s", self.cl.is_redundant()) if self.cl.is_redundant(): self._redundant_on() else: self._redundant_off() def _redundant_off(self): CsHelper.service("conntrackd", "stop") CsHelper.service("keepalived", "stop") CsHelper.umount_tmpfs(self.CS_RAMDISK_DIR) CsHelper.rmdir(self.CS_RAMDISK_DIR) CsHelper.rm(self.CONNTRACKD_CONF) CsHelper.rm(self.KEEPALIVED_CONF) def _redundant_on(self): guest = self.address.get_guest_if() # No redundancy if there is no guest network if guest is None: self.set_backup() self._redundant_off() return interfaces = [interface for interface in self.address.get_interfaces() if interface.is_guest()] isDeviceReady = False dev = '' for interface in interfaces: if dev == interface.get_device(): continue dev = interface.get_device() logging.info("Wait for devices to be configured so we can start keepalived") devConfigured = CsDevice(dev, self.config).waitfordevice() if devConfigured: command = "ip link show %s | grep 'state UP'" % dev devUp = CsHelper.execute(command) if devUp: logging.info("Device %s is present, let's start keepalived now." % dev) isDeviceReady = True if not isDeviceReady: logging.info("Guest network not configured yet, let's stop router redundancy for now.") CsHelper.service("conntrackd", "stop") CsHelper.service("keepalived", "stop") return CsHelper.mkdir(self.CS_RAMDISK_DIR, 0755, False) CsHelper.mount_tmpfs(self.CS_RAMDISK_DIR) CsHelper.mkdir(self.CS_ROUTER_DIR, 0755, False) for s in self.CS_TEMPLATES: d = s if s.endswith(".templ"): d = s.replace(".templ", "") CsHelper.copy_if_needed( "%s/%s" % (self.CS_TEMPLATES_DIR, s), "%s/%s" % (self.CS_ROUTER_DIR, d)) CsHelper.copy_if_needed( "%s/%s" % (self.CS_TEMPLATES_DIR, "keepalived.conf.templ"), self.KEEPALIVED_CONF) CsHelper.copy_if_needed( "%s/%s" % (self.CS_TEMPLATES_DIR, "checkrouter.sh.templ"), "/opt/cloud/bin/checkrouter.sh") CsHelper.execute( 'sed -i "s/--exec $DAEMON;/--exec $DAEMON -- --vrrp;/g" /etc/init.d/keepalived') # checkrouter.sh configuration check_router = CsFile("/opt/cloud/bin/checkrouter.sh") check_router.greplace("[RROUTER_LOG]", self.RROUTER_LOG) check_router.commit() # keepalived configuration keepalived_conf = CsFile(self.KEEPALIVED_CONF) keepalived_conf.search( " router_id ", " router_id %s" % self.cl.get_name()) keepalived_conf.search( " interface ", " interface %s" % guest.get_device()) keepalived_conf.search( " advert_int ", " advert_int %s" % self.cl.get_advert_int()) keepalived_conf.greplace("[RROUTER_BIN_PATH]", self.CS_ROUTER_DIR) keepalived_conf.section("authentication {", "}", [ " auth_type AH \n", " auth_pass %s\n" % self.cl.get_router_password()[:8]]) keepalived_conf.section( "virtual_ipaddress {", "}", self._collect_ips()) # conntrackd configuration conntrackd_template_conf = "%s/%s" % (self.CS_TEMPLATES_DIR, "conntrackd.conf.templ") conntrackd_temp_bkp = "%s/%s" % (self.CS_TEMPLATES_DIR, "conntrackd.conf.templ.bkp") CsHelper.copy(conntrackd_template_conf, conntrackd_temp_bkp) conntrackd_tmpl = CsFile(conntrackd_template_conf) conntrackd_tmpl.section("Multicast {", "}", [ "IPv4_address 225.0.0.50\n", "Group 3780\n", "IPv4_interface %s\n" % guest.get_ip(), "Interface %s\n" % guest.get_device(), "SndSocketBuffer 1249280\n", "RcvSocketBuffer 1249280\n", "Checksum on\n"]) conntrackd_tmpl.section("Address Ignore {", "}", self._collect_ignore_ips()) conntrackd_tmpl.commit() conntrackd_conf = CsFile(self.CONNTRACKD_CONF) is_equals = conntrackd_tmpl.compare(conntrackd_conf) force_keepalived_restart = False proc = CsProcess(['/etc/conntrackd/conntrackd.conf']) if not proc.find() or not is_equals: CsHelper.copy(conntrackd_template_conf, self.CONNTRACKD_CONF) CsHelper.service("conntrackd", "restart") force_keepalived_restart = True # Restore the template file and remove the backup. CsHelper.copy(conntrackd_temp_bkp, conntrackd_template_conf) CsHelper.execute("rm -rf %s" % conntrackd_temp_bkp) # Configure heartbeat cron job - runs every 30 seconds heartbeat_cron = CsFile("/etc/cron.d/heartbeat") heartbeat_cron.add("SHELL=/bin/bash", 0) heartbeat_cron.add( "PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin", 1) heartbeat_cron.add( "* * * * * root $SHELL %s/check_heartbeat.sh 2>&1 > /dev/null" % self.CS_ROUTER_DIR, -1) heartbeat_cron.add( "* * * * * root sleep 30; $SHELL %s/check_heartbeat.sh 2>&1 > /dev/null" % self.CS_ROUTER_DIR, -1) heartbeat_cron.commit() proc = CsProcess(['/usr/sbin/keepalived']) if not proc.find(): force_keepalived_restart = True if keepalived_conf.is_changed() or force_keepalived_restart: keepalived_conf.commit() os.chmod(self.KEEPALIVED_CONF, 0o644) if force_keepalived_restart or not self.cl.is_primary(): CsHelper.service("keepalived", "restart") else: CsHelper.service("keepalived", "reload") def release_lock(self): try: os.remove("/tmp/primary_lock") except OSError: pass def set_lock(self): """ Make sure that primary state changes happen sequentially """ iterations = 10 time_between = 1 for iter in range(0, iterations): try: s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) s.bind('/tmp/primary_lock') return s except socket.error, e: error_code = e.args[0] error_string = e.args[1] print "Process already running (%d:%s). Exiting" % (error_code, error_string) logging.info("Primary is already running, waiting") sleep(time_between) def set_fault(self): """ Set fault mode on this router """ if not self.cl.is_redundant(): logging.error("Set fault called on non-redundant router") return self.set_lock() logging.info("Setting router to fault") interfaces = [interface for interface in self.address.get_interfaces() if interface.is_public()] for interface in interfaces: CsHelper.execute("ifconfig %s down" % interface.get_device()) cmd = "%s -C %s" % (self.CONNTRACKD_BIN, self.CONNTRACKD_CONF) CsHelper.execute("%s -s" % cmd) CsHelper.service("ipsec", "stop") CsHelper.service("xl2tpd", "stop") CsHelper.service("dnsmasq", "stop") interfaces = [interface for interface in self.address.get_interfaces() if interface.needs_vrrp()] for interface in interfaces: CsPasswdSvc(interface.get_gateway() + "," + interface.get_ip()).stop() self.cl.set_fault_state() self.cl.save() self.release_lock() logging.info("Router switched to fault mode") interfaces = [interface for interface in self.address.get_interfaces() if interface.is_public()] CsHelper.reconfigure_interfaces(self.cl, interfaces) def set_backup(self): """ Set the current router to backup """ if not self.cl.is_redundant(): logging.error("Set backup called on non-redundant router") return self.set_lock() logging.debug("Setting router to backup") dev = '' interfaces = [interface for interface in self.address.get_interfaces() if interface.is_public()] for interface in interfaces: if dev == interface.get_device(): continue logging.info("Bringing public interface %s down" % interface.get_device()) cmd2 = "ip link set %s down" % interface.get_device() CsHelper.execute(cmd2) dev = interface.get_device() cmd = "%s -C %s" % (self.CONNTRACKD_BIN, self.CONNTRACKD_CONF) CsHelper.execute("%s -d" % cmd) CsHelper.service("ipsec", "stop") CsHelper.service("xl2tpd", "stop") interfaces = [interface for interface in self.address.get_interfaces() if interface.needs_vrrp()] for interface in interfaces: CsPasswdSvc(interface.get_gateway() + "," + interface.get_ip()).stop() CsHelper.service("dnsmasq", "stop") self.cl.set_primary_state(False) self.cl.save() self.release_lock() interfaces = [interface for interface in self.address.get_interfaces() if interface.is_public()] CsHelper.reconfigure_interfaces(self.cl, interfaces) logging.info("Router switched to backup mode") def set_primary(self): """ Set the current router to primary """ if not self.cl.is_redundant(): logging.error("Set primary called on non-redundant router") return self.set_lock() logging.debug("Setting router to primary") dev = '' interfaces = [interface for interface in self.address.get_interfaces() if interface.is_public()] route = CsRoute() for interface in interfaces: if dev == interface.get_device(): continue dev = interface.get_device() logging.info("Will proceed configuring device ==> %s" % dev) cmd = "ip link set %s up" % dev if CsDevice(dev, self.config).waitfordevice(): CsHelper.execute(cmd) logging.info("Bringing public interface %s up" % dev) try: gateway = interface.get_gateway() logging.info("Adding gateway ==> %s to device ==> %s" % (gateway, dev)) if dev == CsHelper.PUBLIC_INTERFACES[self.cl.get_type()]: route.add_defaultroute(gateway) except Exception: logging.error("ERROR getting gateway from device %s" % dev) else: logging.error("Device %s was not ready could not bring it up" % dev) logging.debug("Configuring static routes") static_routes = CsStaticRoutes("staticroutes", self.config) static_routes.process() cmd = "%s -C %s" % (self.CONNTRACKD_BIN, self.CONNTRACKD_CONF) CsHelper.execute("%s -c" % cmd) CsHelper.execute("%s -f" % cmd) CsHelper.execute("%s -R" % cmd) CsHelper.execute("%s -B" % cmd) CsHelper.service("ipsec", "restart") CsHelper.service("xl2tpd", "restart") interfaces = [interface for interface in self.address.get_interfaces() if interface.needs_vrrp()] for interface in interfaces: if interface.is_added(): CsPasswdSvc(interface.get_gateway() + "," + interface.get_ip()).restart() CsHelper.service("dnsmasq", "restart") self.cl.set_primary_state(True) self.cl.save() self.release_lock() interfaces = [interface for interface in self.address.get_interfaces() if interface.is_public()] CsHelper.reconfigure_interfaces(self.cl, interfaces) public_devices = list(set([interface.get_device() for interface in interfaces])) if len(public_devices) > 1: # Handle specific failures when multiple public interfaces public_devices.sort() # Ensure the default route is added, or outgoing traffic from VMs with static NAT on # the subsequent interfaces will go from the wrong IP route = CsRoute() dev = '' for interface in interfaces: if dev == interface.get_device(): continue dev = interface.get_device() gateway = interface.get_gateway() if gateway: route.add_route(dev, gateway) # The first public interface has a static MAC address between VRs. Subsequent ones don't, # so an ARP announcement is needed on failover for device in public_devices[1:]: logging.info("Sending garp messages for IPs on %s" % device) for interface in interfaces: if interface.get_device() == device: CsHelper.execute("arping -I %s -U %s -c 1" % (device, interface.get_ip())) logging.info("Router switched to primary mode") def _collect_ignore_ips(self): """ This returns a list of ip objects that should be ignored by conntrackd """ lines = [] lines.append("\t\t\tIPv4_address %s\n" % "127.0.0.1") lines.append("\t\t\tIPv4_address %s\n" % self.address.get_control_if().get_ip()) # FIXME - Do we need to also add any internal network gateways? return lines def _collect_ips(self): """ Construct a list containing all the ips that need to be looked afer by vrrp This is based upon the address_needs_vrrp method in CsAddress which looks at the network type and decides if it is an internal address or an external one In a DomR there will only ever be one address in a VPC there can be many The new code also gives the possibility to cloudstack to have a hybrid device that could function as a router and VPC router at the same time """ lines = [] for interface in self.address.get_interfaces(): if interface.needs_vrrp(): cmdline = self.config.get_cmdline_instance() if not interface.is_added(): continue str = " %s brd %s dev %s\n" % (interface.get_gateway_cidr(), interface.get_broadcast(), interface.get_device()) lines.append(str) return lines