helloworld of lvs

##################lvs##############

LVS-NAT: address translation
three servers test
192.168.139.161
192.168.139.193
192.168 .139.194

reference http://www.cnblogs.com/MacoLee/p/5856858.html

yum install ipvsadm -y

cat /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/ipv4/ip_forward

ipvsadm -A -t 192.168.139.161:80 -s rr

[root@LVS ~]# ipvsadm -A -t 192.168.139.161:80 -s rr #Define a cluster service
[root@LVS ~]# ipvsadm -a -t 192.168.139.161:80 -r 192.168.139.193 -m #Add RealServer and assign the scheduling algorithm to NAT
[root@LVS ~]# ipvsadm -a -t 192.168.139.161:80 -r 192.168.139.194 -m #Add RealServer and assign the scheduling algorithm to NAT
[root@LVS ~]# ipvsadm -L -n #View the list of rules defined by ipvs

Wrong test several times, found that the average switch between 193 and 194
curl http://192.168.139.161/index.html

to modify the weight

ipvsadm -E -t 192.168.139.161:80 -s wrr
ipvsadm -e -t 192.168.139.161:80 -r 192.168.139.193 -m -w 3
ipvsadm -e -t 192.168.139.161:80 -r 192.168.139.194 -m -w 1

I tested it several times and found that the ratio of switching 193 and 194 is 3:1
curl http://192.168.139.161/index.html
to save it permanently #The
first method:
# service ipvsadm save
ipvsadm: Saving IPVS table to /etc/sysconfig /ipvsadm: [OK] #Second

method:
ipvsadm -S > /etc/sysconfig/ipvsadm.s1

Empty:
ipvsadm -C

restore
ipvsadm -R < /etc/sysconfig/ipvsadm.s1

######## #########LVS-DR: Direct Routing
http://blog.csdn.net/gzh0222/article/details/8566516
################# ###On realserver

echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
#The above commands need to be added to the /etc/rc.local file to make it take effect automatically

# vim /etc/sysconfig/network-scripts/ifcfg-lo:0 The content is as follows
DEVICE=lo:0  
IPADDR=10.3.3.100
NETMASK=255.255.255.255
BROADCAST=10.3.3.100
ONBOOT=yes
NAME=loopback  


ifdown lo:0
ifup lo:0
route add -host 10.3.3.100 dev lo:0
echo "route add -host 10.3.3.100 dev lo:0" >> /etc/rc.local

###################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################

_
_ #######
# vim /etc/sysconfig/network-scripts/ifcfg-eth2:0 The content is as follows

DEVICE=eth2:0
IPADDR=10.3.3.100
NETMASK=255.255.255.255
BROADCAST=10.3.3.100
ONBOOT=yes

#Order
ifdown eth2:0
ifup eth2:0
route add -host 10.3.3.100 dev eth2:0
echo "route add -host 10.3.3.100 dev eth2:0" >> /etc/rc.local
echo "1" > /proc/sys/net/ipv4/ip_forward
echo "echo 1 > /proc/sys/net/ipv4/ip_forward" >> /etc/rc.local
ipvsadm -A -t 10.3.3.100:80 -s wlc
ipvsadm -a -t 10.3.3.100:80 -r 10.3.3.3 -g -w 2
ipvsadm -a -t 10.3.3.100:80 -r 10.3.3.4 -g -w 1

###################

Access curl from outside http://10.3.3.100 Test
tcpdump -i eth2 -e -l -s 0 -w 194.pcp
and then use wireshark Look at the network card traffic on each machine

############tun mode

health check
##check-lvs-health.sh

#!/bin/bash
# VIP=172.16.100.100
CPORT=80
FAIL_BACK=127.0.0.1
RS=("10.3.3.3" "10.3.3.4")
declare -a RSSTATUS
RW=("2" "1")
RPORT=80
TYPE=g
CHCLOOP=3
LOG = / var / log / ipvsmonitor.log
addrs() {
ipvsadm -a -t $VIP:$CPORT -r $1:$RPORT -$TYPE -w $2
[ $? -eq 0 ] && return 0 || return 1
}
delrs() {
ipvsadm -d -t $ VIP: $ CPORT -r $ 1: $ RPORT
[ $? -eq 0 ] && return 0 || return 1
}
checkrs() {  
local I=1
while [ $I -le $CHKLOOP ];
do
        if curl --connect-timeout 1 http://$1 &> /dev/null;
        then
        return 0
        be
        let I++
done
return 1
}
fixed() {  
local I local COUNT=0;
for I in ${RS[*]};
do
        if ipvsadm -L -n | grep "$I:$RPORT" && > /dev/null ;
        then
                RSSTATUS[$COUNT]=1
        else
                RSSTATUS[$COUNT]=0
                A++
                Dir [0] = $ A  
        be
        let COUNT++
done
}
initstatus  
while :;
do
        let COUNT=0
        for I in ${RS[*]};
        do
        if checkrs $I;
        then
                if [ ${RSSTATUS[$COUNT]} -eq 0 ];
                then
                        addrs $I ${RW[$COUNT]}
                        [ $? -eq 0 ] && RSSTATUS[$COUNT]=1 && echo "`date +'%F %H:%M:%S'`, $I is back." >> $LOG
                be
        else
                if [ ${RSSTATUS[$COUNT]} -eq 1 ];
                then
                        delrs $I
                        [ $? -eq 0 ] && RSSTATUS[$COUNT]=0 && echo "`date +'%F %H:%M:%S'`, $I is gone." >> $LOG
                be
        be
        let COUNT++
        done
        sleep 5
done

######

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