LVS/DR combined with keepalived
LVS/DR configuration
Prepare 3 machines:
Dir (192.168.220.141)
Rs1 (192.168. 220.143)
Rs2 (192.168.220.144)
Vip (192.168.220.110)
Vim / usr/local/sbin/lvs_dr.sh / / added on Director
#! / bin/bash
Echo 1 > / proc/sys/net/ipv4/ip_forward
Ipv=/sbin/ipvsadm
Vip=192.168.220.110
Rs1=192.168.220.143
Rs2=192.168.220.144
Ifconfig eth0:0$ vip broadcast $vip netmask 255.255.255.255 up
Route add-host $vip dev eth0:0
$ipv-C
$ipv-A-t $vip:80-s rr
$ipv-a-t $vip:80-r $rs1:80-g-w 1
$ipv-a-t $vip:80-r $rs2:80-g-w 1
On two rs: vim / usr/local/sbin/lvs_dr_rs.sh
#! / bin/bash
Vip=192.168.220.110
Ifconfig lo:0$ vip broadcast $vip netmask 255.255.255.255 up
Route add-host $vip lo:0
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
Then execute on director: bash / usr/local/sbin/lvs_dr.sh
Execute on two rs: bash / usr/local/sbin/lvs_dr_rs.sh
Browser test access under Windows
Combined with keepalived
Prepare another machine as a backup dir (192.168.220.129)
On the main dir
Vim / etc/keepalived/keepalived.conf
Vrrp_instance VI_1 {
State MASTER # BACKUP on the standby server
Interface eth0
Virtual_router_id 51
90 on priority 100 # standby server
Advert_int 1
Authentication {
Auth_type PASS
Auth_pass 1111
}
Virtual_ipaddress {
192.168.220.110
}
}
Virtual_server 192.168.220.110 80 {
Delay_loop 6 # (query realserver status every 10 seconds)
Lb_algo wlc # (lvs algorithm)
Lb_kind DR # (Direct Route)
Persistence_timeout 60 # (connections to the same IP are assigned to the same realserver within 60 seconds)
Protocol TCP # (check realserver status with TCP protocol)
Real_server 192.168.220.143 80 {
Weight 100 # (weight)
TCP_CHECK {
Connect_timeout 10 # (10 seconds no response timeout)
Nb_get_retry 3
Delay_before_retry 3
Connect_port 80
}
}
Real_server 192.168.220.144 80 {
Weight 100
TCP_CHECK {
Connect_timeout 10
Nb_get_retry 3
Delay_before_retry 3
Connect_port 80
}
}
}
Scp / etc/keepalived/keepalived.conf 192.168.220.129://etc/keepalived/keepalived.conf
On standby dir
Vim / etc/keepalived/keepalived.conf
Modify the following:
State MASTER-> state BACKUP
Priority 100-> priority 90
After configuring keepalived, you need to enable port forwarding (both master and slave):
Echo 1 > / proc/sys/net/ipv4/ip_forward
Then, execute the / usr/local/sbin/lvs_dr_rs.sh script on both rs
Finally, start the keepalived service (master then slave) on the two director:
/ etc/init.d/keepalived start
In addition, it is important to note that starting the keepalived service automatically generates vip and ipvsadm rules, eliminating the need to execute the / usr/local/sbin/lvs_dr.sh script mentioned above.
