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2ffc0c5073
* Increase lease time to infinite Lease time set to effectively infinite (36000+ days) since we fully control VM lifecycle via CloudStack Infinite time helps avoid some edge cases which could cause DHCPNAK being sent to VMs since (RHEL) system lose routes when they receive DHCPNAK When VM is expunged, it's active lease and DHCP/DNS config is properly removed from related files in VR. * desc fix
203 lines
8.1 KiB
Python
Executable File
203 lines
8.1 KiB
Python
Executable File
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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import CsHelper
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import logging
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import os
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from netaddr import *
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from random import randint
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from CsGuestNetwork import CsGuestNetwork
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from cs.CsDatabag import CsDataBag
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from cs.CsFile import CsFile
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LEASES = "/var/lib/misc/dnsmasq.leases"
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DHCP_HOSTS = "/etc/dhcphosts.txt"
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DHCP_OPTS = "/etc/dhcpopts.txt"
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CLOUD_CONF = "/etc/dnsmasq.d/cloud.conf"
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class CsDhcp(CsDataBag):
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""" Manage dhcp entries """
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def process(self):
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self.hosts = {}
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self.changed = []
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self.devinfo = CsHelper.get_device_info()
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self.preseed()
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self.cloud = CsFile(DHCP_HOSTS)
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self.dhcp_opts = CsFile(DHCP_OPTS)
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self.conf = CsFile(CLOUD_CONF)
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self.cloud.repopulate()
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self.dhcp_opts.repopulate()
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for item in self.dbag:
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if item == "id":
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continue
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if not self.dbag[item]['remove']:
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self.add(self.dbag[item])
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self.configure_server()
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restart_dnsmasq = False
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if self.conf.commit():
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restart_dnsmasq = True
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if self.cloud.commit():
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restart_dnsmasq = True
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self.dhcp_opts.commit()
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if restart_dnsmasq:
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self.delete_leases()
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self.write_hosts()
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if not self.cl.is_redundant() or self.cl.is_master():
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if restart_dnsmasq:
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CsHelper.service("dnsmasq", "restart")
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else:
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CsHelper.start_if_stopped("dnsmasq")
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CsHelper.service("dnsmasq", "reload")
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def configure_server(self):
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# self.conf.addeq("dhcp-hostsfile=%s" % DHCP_HOSTS)
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idx = 0
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for i in self.devinfo:
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if not i['dnsmasq']:
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continue
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device = i['dev']
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ip = i['ip'].split('/')[0]
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sline = "dhcp-range=set:interface-%s-%s" % (device, idx)
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line = "dhcp-range=set:interface-%s-%s,%s,static" % (device, idx, ip)
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self.conf.search(sline, line)
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gn = CsGuestNetwork(device, self.config)
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sline = "dhcp-option=tag:interface-%s-%s,15" % (device, idx)
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line = "dhcp-option=tag:interface-%s-%s,15,%s" % (device, idx, gn.get_domain())
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self.conf.search(sline, line)
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# DNS search order
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if gn.get_dns() and device:
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sline = "dhcp-option=tag:interface-%s-%s,6" % (device, idx)
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dns_list = [x for x in gn.get_dns() if x]
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line = "dhcp-option=tag:interface-%s-%s,6,%s" % (device, idx, ','.join(dns_list))
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self.conf.search(sline, line)
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# Gateway
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gateway = ''
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if self.config.is_vpc():
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gateway = gn.get_gateway()
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else:
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gateway = i['gateway']
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if gateway != '0.0.0.0':
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sline = "dhcp-option=tag:interface-%s-%s,3," % (device, idx)
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line = "dhcp-option=tag:interface-%s-%s,3,%s" % (device, idx, gateway)
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self.conf.search(sline, line)
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# Netmask
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netmask = ''
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if self.config.is_vpc():
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netmask = gn.get_netmask()
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else:
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netmask = str(i['network'].netmask)
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sline = "dhcp-option=tag:interface-%s-%s,1," % (device, idx)
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line = "dhcp-option=tag:interface-%s-%s,1,%s" % (device, idx, netmask)
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self.conf.search(sline, line)
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idx += 1
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def delete_leases(self):
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macs_dhcphosts = []
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try:
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logging.info("Attempting to delete entries from dnsmasq.leases file for VMs which are not on dhcphosts file")
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for host in open(DHCP_HOSTS):
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macs_dhcphosts.append(host.split(',')[0])
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removed = 0
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for leaseline in open(LEASES):
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lease = leaseline.split(' ')
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mac = lease[1]
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ip = lease[2]
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if mac not in macs_dhcphosts:
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cmd = "dhcp_release $(ip route get %s | grep eth | head -1 | awk '{print $3}') %s %s" % (ip, ip, mac)
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logging.info(cmd)
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CsHelper.execute(cmd)
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removed = removed + 1
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self.del_host(ip)
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logging.info("Deleted %s entries from dnsmasq.leases file" % str(removed))
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except Exception as e:
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logging.error("Caught error while trying to delete entries from dnsmasq.leases file: %s" % e)
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def preseed(self):
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self.add_host("127.0.0.1", "localhost")
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self.add_host("127.0.1.1", "%s" % CsHelper.get_hostname())
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self.add_host("::1", "localhost ip6-localhost ip6-loopback")
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self.add_host("ff02::1", "ip6-allnodes")
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self.add_host("ff02::2", "ip6-allrouters")
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if self.config.is_router():
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self.add_host(self.config.address().get_guest_ip(), "%s data-server" % CsHelper.get_hostname())
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def write_hosts(self):
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file = CsFile("/etc/hosts")
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file.repopulate()
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for ip in self.hosts:
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file.add("%s\t%s" % (ip, self.hosts[ip]))
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if file.is_changed():
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file.commit()
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logging.info("Updated hosts file")
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else:
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logging.debug("Hosts file unchanged")
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def add(self, entry):
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self.add_host(entry['ipv4_address'], entry['host_name'])
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# Lease time set to effectively infinite (36000+ days) since we properly control all DHCP/DNS config via CloudStack.
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# Infinite time helps avoid some edge cases which could cause DHCPNAK being sent to VMs since
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# (RHEL) system lose routes when they receive DHCPNAK.
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# When VM is expunged, its active lease and DHCP/DNS config is properly removed from related files in VR,
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# so the infinite duration of lease does not cause any issues or garbage.
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# There will be soon a PR which also regenerates the /var/lib/misc/dnsmasq.leases (active lease DB file)
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# in the new VR (when restarting network with cleanup), which will help around RHEL edge cases (described above)
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# for the VMs who are already running in productions systems with 30d lease time.
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lease = randint(870000, 870010)
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if entry['default_entry']:
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self.cloud.add("%s,%s,%s,%sh" % (entry['mac_address'],
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entry['ipv4_address'],
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entry['host_name'],
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lease))
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else:
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tag = entry['ipv4_address'].replace(".", "_")
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self.cloud.add("%s,set:%s,%s,%s,%sh" % (entry['mac_address'],
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tag,
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entry['ipv4_address'],
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entry['host_name'],
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lease))
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self.dhcp_opts.add("%s,%s" % (tag, 3))
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self.dhcp_opts.add("%s,%s" % (tag, 6))
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self.dhcp_opts.add("%s,%s" % (tag, 15))
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i = IPAddress(entry['ipv4_address'])
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# Calculate the device
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for v in self.devinfo:
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if i > v['network'].network and i < v['network'].broadcast:
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v['dnsmasq'] = True
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# Virtual Router
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v['gateway'] = entry['default_gateway']
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def add_host(self, ip, hosts):
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self.hosts[ip] = hosts
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def del_host(self, ip):
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if ip in self.hosts:
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self.hosts.pop(ip)
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