实验环境：

实验目的：

实现存储内容的主从备份

实验搭建：

一、主服务器：

1、挂载软件包

#挂载软件包
mount.cifs //192.168.100.3/lzp /mnt

#创建目录
mkdir /opt/magent       
#解压必要安装包
cd /mnt/mem
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

2、对组件进行编译安装

#编译安装libevent
cd /opt/libevent-2.1.8-stable/
./configure --prefix=/usr
make && make install

#编译安装memcached
cd /opt/memcached-1.5.6/
./configure --with-libevent=/usr
make && make install

#编译安装magent
cd /opt/magent/
#修改ketama.h配置文件
vim ketama.h
#ifndef SSIZE_MAX
#define SSIZE_MAX 32767
#将#endif移动到第三行，删除掉末尾的
#endif

vim Makefile
#第一行末尾添加-lm
LIBS = -levent-lm
#编译
make

#编译好的magent文件

3、将编译好的magent文件复制到/usr/bin目录下，并推送给从服务器

#安装openssh推送软件
yum install openssh-clients -y
#将编译好的magent文件复制到/usr/bin目录下
cp magent /usr/bin

#推送magent文件
scp magent :/usr/bin
The authenticity of host ‘192.168.45.131 (192.168.45.131)‘ can‘t be established.
ECDSA key fingerprint is SHA256:bw2256OHr5apf7CliZv/fAOyVNVsMmRn+lZ5efeQgTg.
ECDSA key fingerprint is MD5:6f:f6:70:4f:46:64:ec:17:a7:ae:c0:15:1c:8b:55:1c.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘192.168.45.131‘ (ECDSA) to the list of known hosts.
‘s password: 
magent                                     100%  112KB   5.8MB/s   00:00

4、关闭防火墙和安全功能

systemctl stop firewalld.service 
setenforce 0

5、安装keepalived，并进行修改

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

global_defs {
   notification_email {
     
     
     
   }
   notification_email_from 
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   #修改route-id
   router_id MAGENT_HA
}

vrrp_instance VI_1 {
    state MASTER
    #修改网卡端口
    interface ens33
    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 {
    #设置虚拟指向地址
        192.168.45.188
    }
}

6、创建magent脚本

mkdir /opt/shell
cd /opt/shell/
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 192.168.45.188 -p 12000 -s 192.168.45.132:
11211 -b 192.168.45.131:11211
else
pkill -9 magent
fi

#给于运行权限
chmod +x magent.sh

7、启动服务，并查看

#启动keepalived
systemctl start keepalived.service

#查看迁移地址
ip addr

#启动memcached 
memcached -m 512k -u root -d -l 192.168.45.132 -p 11211

安装telent进行测试

yum install telnet -y

二、从服务器

1、挂载软件包，并关闭防火墙和安全功能

mount.cifs //192.168.100.3/lzp /mnt
#关闭防火墙和安全功能
systemctl stop firewalld.service 
setenforce 0

2、解压安装包，并进行编译

#解压安装包
cd /mnt/mem
tar zxvf libevent-2.1.8-stable.tar.gz -C /opt
tar zxvf memcached-1.5.6.tar.gz -C /opt
#安装必要组件包
yum install gcc gcc-c++ make -y
#编译安装libevent
cd /opt/libevent-2.1.8-stable/
./configure --prefix=/usr
make && make install
#编译安装memcached
cd /opt/memcached-1.5.6/
./configure --with-libevent=/usr
make && make install

3、安装keepalived

#安装keepalived
yum install keepalived -y
#修改keepalived文件
cd /etc/keepalived/
mv keepalived.conf keepalived.conf.bk

vim keepalived.conf

! Configuration File for keepalived

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

global_defs {
   notification_email {
     
     
     
   }
   notification_email_from 
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   #修改router_id
   router_id MAGENT_HB
}

vrrp_instance VI_1 {
    state BACKUP
    #修改网络接口
    interface ens33
    #修改virtual_router_id
    virtual_router_id 52
    #修改优先级
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        magent
   }
    virtual_ipaddress {
        #修改地址
        192.168.45.188
    }
}

4、创建magent脚本

mkdir /opt/shell
cd /opt/shell/
vim magent.sh
#!/bin/bash
K=`ip addr | grep 192.168.45.188 | grep -v grep | wc -l`
if [ $K -gt 0 ];then
        magent -u root -n 51200 -l 192.168.45.188 -p 12000 -s 192.168.45.132:
11211 -b 192.168.45.131:11211
else
pkill -9 magent
fi
chmod +x magent.sh

4、启动服务

#启动keepalived
systemctl start keepalived.service
 #启动memcached
memcached -m 512k -u root -d -l 192.168.45.131 -p 11211

安装telent进行测试

yum install telnet -y

三、客户机

#关闭防火墙和安全功能
systemctl stop firewalld.service 
setenforce 0
#安装telnet 
yum install telnet -y
#在telnet中写入文件
[ ~]# telnet 192.168.45.188 12000
Trying 192.168.45.188...
Connected to 192.168.45.188.
Escape character is ‘^]‘.
add username 0 0 7
1234567
STORED

在从服务器上查看

在主服务器上查看