NTP安装

yum -y install ntp

systemctl enable ntpd

首先同步一次时间

ntpdate time.windows.com

ntp配置(Host1 Host2)

/etc/ntp.conf

server time.windows.com prefer
server 0.asia.pool.ntp.org
server 1.asia.pool.ntp.org
server 2.asia.pool.ntp.org


#记录上次的NTP server与上层NTP server连接接所花费的时间
driftfile /var/lib/ntp/drift


#设置默认策略为允许任何主机进行时间同步
restrict 0.0.0.0 mask 0.0.0.0 nomodify


#设置ntp日志的path
statsdir /var/log/ntp/


#设置ntp日志文件
logfile /var/log/ntp/ntp.log

mkdir /var/log/ntp/; touch /var/log/ntp/ntp.log; chown ntp:ntp /var/log/ntp/ntp.log

systemctl start ntpd

Keepalived安装

yum -y install Keepalived

host1配置

/etc/keepalived/keepalived.conf

global_defs {
        notification_email {
                xx@xx.com
        }

        notification_email_from keepalived@xx.com
        smtp_server 127.0.0.1
        smtp_connect_timeout 30
        router_id LVS_DEVEL
}




vrrp_instance VI_1 {
        state MASTER        ############ MASTER/BACKUP
        interface eno16777984
        virtual_router_id 51
        mcast_src_ip 172.16.0.2
        priority 150                  ########### MASTER权值要比BACKUP高
        advert_int 1

        authentication {
                auth_type PASS
                auth_pass GSksLAyTX9ylwG86U2Ez
        }

        virtual_ipaddress {
                172.16.0.10
        }

}

Host2配置

global_defs {
        notification_email {
                xx@xx.com
        }

        notification_email_from keepalived@xx.com
        smtp_server 127.0.0.1
        smtp_connect_timeout 30
        router_id LVS_DEVEL
}




vrrp_instance VI_1 {
        state BACKUP        ############ MASTER/BACKUP
        interface eno16777984
        virtual_router_id 51
        mcast_src_ip 172.16.0.3
        priority 150                  ########### MASTER权值要比BACKUP高
        advert_int 1

        authentication {
                auth_type PASS
                auth_pass GSksLAyTX9ylwG86U2Ez
        }

        virtual_ipaddress {
                172.16.0.10
        }

}

systemctl enable keepalived

systemctl start keepalived

1 windows客户端向NTP每10分钟同步一次时间

gpedit.msc打开组策略

1.1 启动windows NTP客户端

1.2 配置windows NTP客户端

1.3 Internet时间设置里指定时间服务器

点击立即更新

2 linux客户端向NTP每10分钟同步一次时间

2.1 安装NTP

yum -y install ntp

2.2 设置时间同步

执行下面的命令

echo -e "\n\n## sync time\n*/10 * * **    root    ntpdate 172.16.0.10 && hwclock-w" >> /etc/crontab

CentOS7 NTP server + keepalived

原文：http://tianshili.blog.51cto.com/5050423/1879046