keepaived+LVS+Mycat+MySQL双主及主从高可用负载均衡集群

系统集群架构图如下：

一、部署90主机和77主机的MySQL主主配置和90主机和89主机的MySQL主从配置

详情请见（

MySQL主主同步：https://blog.csdn.net/baidu_38432732/article/details/80773634

MySQL主从同步：https://blog.csdn.net/baidu_38432732/article/details/80653873

）

二、部署mycat的读写分离控制，详情请见（https://blog.csdn.net/baidu_38432732/article/details/80708847）

三、配置keepalived+LVS对mycat的高可用及负载均衡集群

1、在117主机和116主机上分别安装keepalived+LVS

[root@mysql ~]# yum -y install keepalived ipvsadm
安装完后修改配置文件：

117Master主机

[root@localhost ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
#   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER #（从的改成backup）
    interface ens33
    virtual_router_id 51
    priority 100 #（从主机的值低于100即可）
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.120
    }
}

virtual_server 192.168.1.120 8066 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 0 #注意改成0，否则会出现异常
    protocol TCP

    real_server 192.168.1.130 8066 {
        weight 1
        SSL_GET {
            url {
              path /
              digest ff20ad2481f97b1754ef3e12ecd3a9cc
            }
            url {
              path /mrtg/
              digest 9b3a0c85a887a256d6939da88aabd8cd
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 8066
        }
    }
    real_server 192.168.1.76 8066 {
        weight 1
        SSL_GET {
            url {
              path /
              digest ff20ad2481f97b1754ef3e12ecd3a9cc
            }
            url {
              path /mrtg/
              digest 9b3a0c85a887a256d6939da88aabd8cd
            }
            connect_timeout 3
            nb_get_retry 3

            delay_before_retry 3
            connect_port 8066
        }
    }
}

2、在130主机和76主机上分别执行以下脚本：

[root@mysql ~]# vim realserver.sh

#!/bin/bash
#description: Config realserver

VIP=192.168.1.120

/etc/rc.d/init.d/functions

case "$1" in
start)
       /sbin/ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
       /sbin/route add -host $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)
       /sbin/ifconfig lo:0 down
       /sbin/route del $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

两台服务器上执行一样的，然后执行以下，命令验证是否执行成功，当两台主机都出现以下则成功