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168 lines
3.0 KiB
Bash
Executable File
168 lines
3.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# $Id: loadbalancer.sh 9947 2010-06-25 19:34:24Z manuel $ $HeadURL: svn://svn.lab.vmops.com/repos/vmdev/java/patches/xenserver/root/loadbalancer.sh $
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# loadbalancer.sh -- reconfigure loadbalancer rules
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#
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#
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# @VERSION@
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usage() {
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printf "Usage: %s: -i <domR eth1 ip> -a <added public ip address> -d <removed> -f <load balancer config> \n" $(basename $0) >&2
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}
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# set -x
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# check if gateway domain is up and running
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check_gw() {
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ping -c 1 -n -q $1 > /dev/null
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if [ $? -gt 0 ]
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then
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sleep 1
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ping -c 1 -n -q $1 > /dev/null
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fi
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return $?;
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}
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# firewall entry to ensure that haproxy can receive on specified port
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fw_entry() {
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local added=$1
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local removed=$2
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if [ "$added" == "none" ]
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then
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added=""
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fi
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if [ "$removed" == "none" ]
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then
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removed=""
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fi
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local a=$(echo $added | cut -d, -f1- --output-delimiter=" ")
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local r=$(echo $removed | cut -d, -f1- --output-delimiter=" ")
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for i in $a
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do
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local pubIp=$(echo $i | cut -d: -f1)
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local dport=$(echo $i | cut -d: -f2)
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for vif in $VIF_LIST; do
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iptables -D INPUT -i $vif -p tcp -d $pubIp --dport $dport -j ACCEPT 2> /dev/null
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iptables -A INPUT -i $vif -p tcp -d $pubIp --dport $dport -j ACCEPT
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if [ $? -gt 0 ]
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then
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return 1
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fi
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done
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done
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for i in $r
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do
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local pubIp=$(echo $i | cut -d: -f1)
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local dport=$(echo $i | cut -d: -f2)
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for vif in $VIF_LIST; do
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iptables -D INPUT -i $vif -p tcp -d $pubIp --dport $dport -j ACCEPT
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done
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done
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return 0
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}
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#Hot reconfigure HA Proxy in the routing domain
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reconfig_lb() {
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/root/reconfigLB.sh
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return $?
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}
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# Restore the HA Proxy to its previous state, and revert iptables rules on DomR
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restore_lb() {
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# Copy the old version of haproxy.cfg into the file that reconfigLB.sh uses
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cp /etc/haproxy/haproxy.cfg.old /etc/haproxy/haproxy.cfg.new
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if [ $? -eq 0 ]
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then
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# Run reconfigLB.sh again
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/root/reconfigLB.sh
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fi
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}
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get_vif_list() {
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local vif_list=""
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for i in /sys/class/net/eth*; do
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vif=$(basename $i);
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if [ "$vif" != "eth0" ] && [ "$vif" != "eth1" ]
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then
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vif_list="$vif_list $vif";
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fi
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done
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echo $vif_list
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}
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mflag=
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iflag=
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aflag=
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dflag=
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fflag=
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while getopts 'i:a:d:f:' OPTION
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do
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case $OPTION in
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i) iflag=1
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domRIp="$OPTARG"
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;;
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a) aflag=1
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addedIps="$OPTARG"
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;;
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d) dflag=1
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removedIps="$OPTARG"
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;;
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f) fflag=1
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cfgfile="$OPTARG"
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;;
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?) usage
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exit 2
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;;
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esac
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done
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VIF_LIST=$(get_vif_list)
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# hot reconfigure haproxy
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reconfig_lb $cfgfile
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if [ $? -gt 0 ]
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then
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printf "Reconfiguring loadbalancer failed\n"
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exit 1
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fi
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if [ "$addedIps" == "" ]
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then
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addedIps="none"
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fi
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if [ "$removedIps" == "" ]
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then
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removedIps="none"
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fi
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# iptables entry to ensure that haproxy receives traffic
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fw_entry $addedIps $removedIps
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if [ $? -gt 0 ]
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then
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# Restore the LB
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restore_lb
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# Revert iptables rules on DomR, with addedIps and removedIps swapped
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fw_entry $removedIps $addedIps
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exit 1
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fi
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exit 0
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