Keepalived搭建LVS高可用性集群系统

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER
    interface enp0s3
    virtual_router_id
    priority
    advert_int
    authentication {
        auth_type PASS
        auth_pass
    }
    virtual_ipaddress {
        192.168.1.200
    }
}

virtual_server 192.168.1.200  {    # 虚拟服务器ip地址和port
    delay_loop 6         # 设置健康检查时间 单位秒
    lb_algo rr           # 设置调度算法
    lb_kind DR           # 设置实现负载均衡机制 有 NAT、TUN、DR三种
    persistence_timeout 50   #会话保持时间，当一个用户50秒内没有进行操作，下次的访问操作才会分发到其它节点
    protocol TCP             # 指定转发协议 TCP/UDP

    real_server 192.168.1.227  {    # 配置服务节点，真实服务器ip地址和port
        weight 3                      # 权重
        TCP_CHECK {                   # real server 的状态检查部分
            connect_port 80           # 连接端口 80
            connect_timeout 3         # 表示3秒无响应超时 
            retry 3                   # 表示重试次数
            delay_before_retry 3      # 表示重试间隔
        }
    }

    real_server 192.168.1.219 80 {
        weight 1
        TCP_CHECK {
            connect_port 80
            connect_timeout 3
            retry 3
            delay_before_retry 3
        }
    }
}

real server

yum install -y ipvsadm

服务启动脚本，此操作是在回环设备上绑定了一个虚拟IP地址，并设定其子网掩码为255.255.255.255 与Director Server上的虚拟IP保持互通，然后禁用了本机的ARP请求

vim /etc/init.d/lvsrs

#!/bin/bash
#description: start real server

VIP=192.168.1.200
/etc/rc.d/init.d/functions
case "$1" in
start)
      # echo " start LVS of Real Server !"
       ifconfig lo: $VIP netmask 255.255.255.255 broadcast $VIP
       /sbin/route add -host $VIP dev lo:
       echo "" >/proc/sys/net/ipv4/conf/lo/arp_ignore
       echo "" >/proc/sys/net/ipv4/conf/lo/arp_announce
       echo "" >/proc/sys/net/ipv4/conf/all/arp_ignore
       echo "" >/proc/sys/net/ipv4/conf/all/arp_announce
       sysctl -p >/dev/null >&
       echo "RealServer Start OK"
       ;;
stop)
       #echo " Stop LVS of Real Server !"
       ifconfig lo: down
       route del $VIP >/dev/null >&
       echo "" >/proc/sys/net/ipv4/conf/lo/arp_ignore
       echo "" >/proc/sys/net/ipv4/conf/lo/arp_announce
       echo "" >/proc/sys/net/ipv4/conf/all/arp_ignore
       echo "" >/proc/sys/net/ipv4/conf/all/arp_announce
       echo "RealServer Stoped"
       ;;
*)
       echo "Usage: $0 {start|stop}"
       exit
esac
exit 

测试

real server

chmod u+x /etc/init.d/lvsrs
service lvsrs [start|stop]

director server

systemctl start keepalived.service
tail -f /var/log/messages