实战案例3:实现双主的LVS-DR模式,利用FWM绑定成一个双主集群服务
[root@ka1-centos8 ~]#vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from kaadmin@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id ka1.magedu.org #在另一个节点为ka2.magedu.org
vrrp_mcast_group4 224.100.100.100
}
vrrp_instance VI_1 {
state MASTER #在另一个节点为BACKUP
interface eth0
virtual_router_id 66
priority 100 #在另一个节点为80
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
10.0.0.10/24 dev eth0 label eth0:1
}
track_interface {
eth0
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance VI_2 {
state BACKUP #在另一个节点为MASTER
interface eth0
virtual_router_id 88
priority 80 #在另一个节点为100
advert_int 1
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
10.0.0.20/24 dev eth0 label eth0:2
}
track_interface {
eth0
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
virtual_server fwmark 6 { #指定FWM为6
delay_loop 2
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
protocol TCP
sorry_server 127.0.0.1 80
real_server 10.0.0.7 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 2
nb_get_retry 3
delay_before_retry 3
}
}
real_server 10.0.0.17 80 {
weight 1
HTTP_GET {
url {
path /
status_code 200
}
connect_timeout 2
nb_get_retry 3
delay_before_retry 3
}
}
}
#两个节点都执行以下操作
[root@ka1-centos8 ~]#iptables -t mangle -A PREROUTING -d 10.0.0.10,10.0.0.20 -p tcp --dport 80 -j MARK --set-mark 6
[root@ka2-centos8 ~]#iptables -t mangle -A PREROUTING -d 10.0.0.10,10.0.0.20 -p tcp --dport 80 -j MARK --set-mark 6
#在RS1和RS2运行下面脚本
[root@rs1 ~]#cat lvs_dr_rs.sh
#!/bin/bash
#Author:wangxiaochun
#Date:2017-08-13
vip=10.0.0.10
vip2=10.0.0.20
mask='255.255.255.255'
dev=lo:1
dev2=lo:2
rpm -q httpd &> /dev/null || yum -y install httpd &>/dev/null
service httpd start &> /dev/null && echo "The httpd Server is Ready!"
echo "<h1>hostname
</h1>" > /var/www/html/index.html
case $1 in
start)
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
ifconfig $dev $vip netmask $mask #broadcast $vip up
ifconfig $dev2 $vip2 netmask $mask #broadcast $vip up
#route add -host $vip dev $dev
echo "The RS Server is Ready!"
;;
stop)
ifconfig $dev down
ifconfig $dev2 down
echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo "The RS Server is Canceled!"
;;
*)
echo "Usage: $(basename $0) start|stop"
exit 1
;;
esac
[root@rs1 ~]#bash lvs_dr_rs.sh start
[root@rs2 ~]#bash lvs_dr_rs.sh start
#访问测试
[root@centos6 ~]#curl 10.0.0.10;curl 10.0.0.20
<h1>rs1.magedu.org</h1>
<h1>rs2.magedu.org</h1>
同步组
LVS NAT 模型VIP和DIP需要同步,需要同步组
vrrp_sync_group VG_1 {
group {
VI_1 # name of vrrp_instance (below)
VI_2 # One for each moveable IP
}
}
vrrp_instance VI_1 {
eth0
vip
}
vrrp_instance VI_2 {
eth1
dip
}
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