第一步:配置memcached主缓存服务器

#挂载软件包
mount.cifs //192.168.142.1/memcached /mnt
cd /mnt/memcached

#创建目录
mkdir /opt/magent       

#解压安装包
tar zxvf magent-0.5.tar.gz -C /opt/magent/
tar zxvf libevent-2.1.8-stable.tar.gz -C /opt
tar zxvf memcached-1.5.6.tar.gz -C /opt

#安装必要组件
yum install gcc gcc-c++ make -y

#进行编译安装
cd /opt/libevent-2.1.8-stable/
./configure --prefix=/usr
make && make install
cd /opt/memcached-1.5.6/
./configure --with-libevent=/usr
make && make install

cd /opt/magent/

vim ketama.h
#ifndef SSIZE_MAX
#define SSIZE_MAX 32767
#endif
#第一行末尾添加-lm
vim Makefile
LIBS = -levent-lm

#编译
make

#安装openssh
yum install openssh-clients -y
cp magent /usr/bin

#推送magent文件
scp magent root@192.168.142.131:/usr/bin

#关闭防火墙和安全功能
systemctl stop firewalld.service 
setenforce 0

#安装keepalived
yum install keepalived -y

#修改配置文件
vim /etc/keepalived/keepalived.conf 
! Configuration File for keepalived

#写入下列内容,定义函数
vrrp_script magent {
        script "/opt/shell/magent.sh"
        interval 2
}

#修改route-id
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 30
   router_id MAGENT_HAL
   #修改id名
}

#修改网卡端口
vrrp_instance VI_1 {
    state MASTER
    interface ens33         #修改网卡信息
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    #修改，调用上边函数
    track_script {
        magent
   }
    virtual_ipaddress {
        192.168.142.100     #定义虚拟IP地址
    }
}

mkdir /opt/shell
cd /opt/shell/

#配置从服务器脚本
vim magent.sh
#!/bin/bash
K=`ps -ef | grep keepalived | grep -v grep | wc -l`
if [ $K -gt 0 ];then
        magent -u root -n 51200 -l 192.168.142.100 -p 12000 -s 192.168.45.132:
11211 -b 192.168.142.131:11211
else
pkill -9 magent
fi

chmod +x magent.sh
#启动
systemctl start keepalived.service

#查看迁移地址
ip addr

#启动主服务器
memcached -m 512k -u root -d -l 192.168.142.130 -p 11211

#查看端口是否正常开启
netstat -anptu | grep 11211

第二步:配置memcached从缓存服务器

#挂载软件包
mount.cifs //192.168.142.1/memcached /mnt

#解压安装包
cd /mnt/memcached
tar zxvf libevent-2.1.8-stable.tar.gz -C /opt
tar zxvf memcached-1.5.6.tar.gz -C /opt
yum install gcc gcc-c++ make -y

cd /opt/libevent-2.1.8-stable/
./configure --prefix=/usr
make && make install

cd /opt/memcached-1.5.6/
./configure --with-libevent=/usr
make && make install

[root@localhost memcached-1.5.6]# cd /etc/keepalived/
[root@localhost keepalived]# mv keepalived.conf keepalived.conf.bk
[root@localhost keepalived]# touch keepalived.conf
[root@localhost keepalived]# vim keepalived.conf

vrrp_script magent {
        script "/opt/shell/magent.sh"
        interval 2
}

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 30
   router_id MAGENT_HB      #id名不可与主服务器相同
}

vrrp_instance VI_1 {
    state BACKUP            #设定从服务器
    interface ens33
    virtual_router_id 52    #id号不可与主服务器相同
    priority 90             #优先级低与主服务器 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        magent
   }
    virtual_ipaddress {
        192.168.142.100     #定义虚拟IP地址
    }
}

mkdir /opt/shell
cd /opt/shell/

#配置从服务器脚本
vim magent.sh
#!/bin/bash
K=`ip addr | grep 192.168.142.100 | grep -v grep | wc -l`
if [ $K -gt 0 ];then
        magent -u root -n 51200 -l 192.168.142.100 -p 12000 -s 192.168.142.130:
11211 -b 192.168.142.131:11211
else
pkill -9 magent
fi
chmod +x magent.sh

#启动keepalived
systemctl start keepalived.service

#关闭防火墙和安全功能
systemctl stop firewalld.service 
setenforce 0

#启动从服务器
memcached -m 512k -u root -d -l 192.168.142.131 -p 11211

#查看端口是否正常开启
netstat -anptu | grep 11211

#安装telent进行测试
yum install telnet -y

第三步:客户端测试

#关闭防火墙和安全功能
systemctl stop firewalld.service 
setenforce 0

#安装telent进行测试
yum install telnet -y

#使用漂移地址登录连接
telnet 192.168.142.100 12000

#创建键值对,验证主从同步
add username 0 0 7
1234567

#双机热备
#停掉主服务器
systemctl stop keepalived.service

#使用漂移地址登录连接
telnet 192.168.142.100 12000

谢谢阅读!!!

原文：https://blog.51cto.com/14449521/2461646