mirror of
https://github.com/apache/cloudstack.git
synced 2025-11-02 20:02:29 +01:00
7ccc833114
This message may show during redundant router start up: FAULT (Restarting DNS forwarder and DHCP server: dnsmasq failed!) This caused by edithost.sh is racy with keepalived process. They both want to restart dnsmasq. Even in normal condition, it's very hard to reproduce this bug. Add file lock for edithost.sh should solve it.
118 lines
2.9 KiB
Bash
Executable File
118 lines
2.9 KiB
Bash
Executable File
#!/usr/bin/env bash
|
|
|
|
|
|
|
|
#
|
|
# Copyright (C) 2010 Cloud.com, Inc. All rights reserved.
|
|
#
|
|
# This software is licensed under the GNU General Public License v3 or later.
|
|
#
|
|
# It is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or any later version.
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
#
|
|
|
|
|
|
# edithosts.sh -- edit the dhcphosts file on the routing domain
|
|
# $1 : the mac address
|
|
# $2 : the associated ip address
|
|
# $3 : the hostname
|
|
|
|
grep "redundant_router=1" /var/cache/cloud/cmdline > /dev/null
|
|
no_redundant=$?
|
|
|
|
wait_for_dnsmasq () {
|
|
local _pid=$(pidof dnsmasq)
|
|
for i in 0 1 2 3 4 5 6 7 8 9 10
|
|
do
|
|
sleep 1
|
|
_pid=$(pidof dnsmasq)
|
|
[ "$_pid" != "" ] && break;
|
|
done
|
|
[ "$_pid" != "" ] && return 0;
|
|
logger -t cloud "edithosts: timed out waiting for dnsmasq to start"
|
|
return 1
|
|
}
|
|
|
|
logger -t cloud "edithosts: update $1 $2 $3 to hosts"
|
|
|
|
[ ! -f /etc/dhcphosts.txt ] && touch /etc/dhcphosts.txt
|
|
[ ! -f /var/lib/misc/dnsmasq.leases ] && touch /var/lib/misc/dnsmasq.leases
|
|
|
|
#delete any previous entries from the dhcp hosts file
|
|
sed -i /$1/d /etc/dhcphosts.txt
|
|
sed -i /$2,/d /etc/dhcphosts.txt
|
|
sed -i /$3,/d /etc/dhcphosts.txt
|
|
|
|
#put in the new entry
|
|
echo "$1,$2,$3,infinite" >>/etc/dhcphosts.txt
|
|
|
|
#delete leases to supplied mac and ip addresses
|
|
sed -i /$1/d /var/lib/misc/dnsmasq.leases
|
|
sed -i /"$2 "/d /var/lib/misc/dnsmasq.leases
|
|
sed -i /"$3 "/d /var/lib/misc/dnsmasq.leases
|
|
|
|
#put in the new entry
|
|
echo "0 $1 $2 $3 *" >> /var/lib/misc/dnsmasq.leases
|
|
|
|
#edit hosts file as well
|
|
sed -i /"$2 "/d /etc/hosts
|
|
sed -i /"$3"/d /etc/hosts
|
|
echo "$2 $3" >> /etc/hosts
|
|
|
|
locked=0
|
|
if [ $no_redundant -eq 0 ]
|
|
then
|
|
#for redundant router, grap the lock to prevent racy with keepalived process
|
|
LOCK=/tmp/rrouter.lock
|
|
|
|
# Wait the lock
|
|
for i in `seq 1 5`
|
|
do
|
|
if [ ! -e $LOCK ]
|
|
then
|
|
touch $LOCK
|
|
locked=1
|
|
break
|
|
fi
|
|
sleep 1
|
|
logger -t cloud "edithosts: sleep 1 second wait for the redundant router lock"
|
|
done
|
|
|
|
if [ $locked -eq 0 ]
|
|
then
|
|
logger -t cloud "edithosts: fail to get the redundant router lock"
|
|
logger -t cloud "edithosts: keepalived should able to handle the dnsmasq restart"
|
|
exit
|
|
fi
|
|
fi
|
|
|
|
# make dnsmasq re-read files
|
|
pid=$(pidof dnsmasq)
|
|
if [ "$pid" != "" ]
|
|
then
|
|
service dnsmasq restart
|
|
else
|
|
if [ $no_redundant -eq 1 ]
|
|
then
|
|
wait_for_dnsmasq
|
|
else
|
|
logger -t cloud "edithosts: skip wait dnsmasq due to redundant virtual router"
|
|
fi
|
|
fi
|
|
|
|
ret=$?
|
|
if [ $locked -eq 1 ]
|
|
then
|
|
rm $LOCK
|
|
fi
|
|
|
|
exit $ret
|