LVS+keepalived 搭建负载均衡

其实搭建负载均衡可以不用nginx  

直接用LVS+keepalived即可   

准备两个tomat  

tomcat1  192.168.80.171

tomcat2  192.168.80.172

两个keepalived  

主  192.168.80.141

备  192.168.80.142

虚拟IP  192.168.80.161

1  在两个tomcat 分别配置虚拟IP并屏蔽交换机广播

进入 init.d目录中   # cd /etc/init.d

创建 一个脚本   # vi realserver 

编辑脚本 

SNS_VIP=192.168.80.161
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev 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
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0

编辑后保存退出  

改变脚本权限  # chmod 755 realserver

启动脚本  service realserver start

2 配置两个keepalived 

安装 # yum -y install keepalived

进入配置文件目录 # cd /etc/keepalived

编辑配置文件 # vi keepalived.conf

global_defs {
#   notification_email {
#       admin@toxingwang.com
#   }
#   notification_email_from master@toxingwang.com
#   smtp_server smtp.exmail.qq.com
#   smtp_connect_timeout 30
        router_id LVS_DEVEL
}

 vrrp_instance VI_1 {
        state MASTER
        interface eth0
        virtual_router_id 51
        priority 100
        advert_int 1
        authentication {
                auth_type PASS
                auth_pass 1111
        }
        virtual_ipaddress {
                192.168.80.161
        }
}

virtual_server 192.168.80.161 80 {
        delay_loop 6
        lb_algo wrr
        lb_kind DR
        nat_mask 255.255.255.0
        persistence_timeout 0
        protocol TCP
        real_server 192.168.80.141 80 {
                weight 1
                TCP_CHECK {
                        connect_timeout 10
                        nb_get_retry 3
                        delay_before_retry 3
                        connect_port 80
                }
        }
        real_server 192.168.80.142 80 {
                weight 1
                TCP_CHECK {
                        connect_timeout 10
                        nb_get_retry 3
                        delay_before_retry 3
                        connect_port 80
                }
        }
}

启动 keepalived # service keepalived start 

此时访问 http://192.168.80.161/  就会轮询 141和142

备机的配置和主机一样  只需修改  state BACKUP即可