Nginx1和Nginx2组成集群，为了实现负载均衡，在集群的前端配置了LVS服务，但是一台LVS容器产生单点故障，因此需要过Keepalived实现LVS的高可用集群

192.168.136.55	node1	keepalived
192.168.136.56	node2	keeplived
192.168.136.57	node3	nginx1
192.168.136.58	node4	nginx2

写nginx1的前端页面

[root@node3 ~]# echo "web test page,node1" > /usr/share/nginx/html/index.html

[root@openEuler-node4 ~]# echo "web test page,node2" > /usr/share/nginx/html/index.html

基于LVS的DR模式，这两个节点要做ARP抑制，绑定VIP

[root@node3 ~]# vi lvs_rs
#!/bin/sh
#
# Startup script handle the initialisation of LVS
# chkconfig: - 28 72
# description: Initialise the Linux Virtual Server for DR
#
### BEGIN INIT INFO
# Provides: ipvsadm
# Required-Start: $local_fs $network $named
# Required-Stop: $local_fs $remote_fs $network
# Short-Description: Initialise the Linux Virtual Server
# Description: The Linux Virtual Server is a highly scalable and highly
# available server built on a cluster of real servers, with the load
# balancer running on Linux.
# description: start LVS of DR-RIP
LOCK=/var/lock/ipvsadm.lock
VIP=192.168.136.100
. /etc/rc.d/init.d/functions
start() {PID=`ifconfig | grep lo:10 | wc -l`if [ $PID -ne 0 ];thenecho "The LVS-DR-RIP Server is already running !"else/sbin/ifconfig lo:10 $VIP netmask 255.255.255.255 broadcast $VIP up/sbin/route add -host $VIP dev lo:10echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/lo/arp_announceecho "1" >/proc/sys/net/ipv4/conf/ens160/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/ens160/arp_announceecho "1" >/proc/sys/net/ipv4/conf/all/arp_ignoreecho "2" >/proc/sys/net/ipv4/conf/all/arp_announce/bin/touch $LOCKecho "starting LVS-DR-RIP server is ok !"fi
}
stop() {/sbin/route del -host $VIP dev lo:10/sbin/ifconfig lo:10 down >/dev/nullecho "0" >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho "0" >/proc/sys/net/ipv4/conf/lo/arp_announceecho "0" >/proc/sys/net/ipv4/conf/ens160/arp_ignoreecho "0" >/proc/sys/net/ipv4/conf/ens160/arp_announceecho "0" >/proc/sys/net/ipv4/conf/all/arp_ignoreecho "0" >/proc/sys/net/ipv4/conf/all/arp_announcerm -rf $LOCK	echo "stopping LVS-DR-RIP server is ok !"
}
status() {if [ -e $LOCK ];thenecho "The LVS-DR-RIP Server is already running !"elseecho "The LVS-DR-RIP Server is not running !"fi
}
case "$1" instart)start;;stop)stop;;restart)stopstart;;status)status;;*)echo "Usage: $1 {start|stop|restart|status}"exit 1
esac
exit 0
[root@node3 ~]# chmod +x lvs_rs 
[root@node3 ~]# ./lvs_rs start
starting LVS-DR-RIP server is ok !

VIP已经绑定好 

 主机路由也有

 node4上也一样

keepalived中TCP的健康检查方式  

 在node1和node2上   使得LVS高可用 

[root@openEuler-node1 ~]# vim /etc/keepalived/keepalived.conf ! Configuration File for keepalived
global_defs {router_id LVS1
}vrrp_instance LVS {state MASTERinterface ens160virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.136.100}
}virtual_server 192.168.136.100 80 {delay_loop 6lb_algo rrlb_kind DRprotocol TCPreal_server 192.168.136.57 80 {weight 1TCP_CHECK {connect_port 80connect_timeout 3retry 3delay_before_retry 3}}real_server 192.168.136.58 80 {weight 1TCP_CHECK {connect_port 80connect_timeout 3retry 3delay_before_retry 3}}

node2与上面类似稍作修改 

为了看效果  安装ipvsadm的管理  yum install ipvsadm

[root@openEuler-node1 ~]# watch ipvsadm -Ln

自己就添加了node3 node4 

测试    

实现负载均衡

当node4的nginx停止之后  查看转发池队列

[root@openEuler-node4 ~]# systemctl stop nginx.service 

没有node4了 

 node4开启nginx

[root@openEuler-node4 ~]# systemctl start nginx.service 

又重新修复好了 

当node1和node2其中一台keepalived停了之后  不影响客户端访问

 node2上