NTP（Network Time Protocol）介绍

NTP 安装

  • 查看是否已安装：

    • CentOS：rpm -qa | grep ntp-*
    • Ubuntu：dpkg -l | grep ntp-*

  • 安装：

    • CentOS 6/7：sudo yum install -y ntp
    • Ubuntu：sudo apt-get install -y ntp

配置阿里云 NTP（推荐）

server 0.centos.pool.ntp.org iburst
server 1.centos.pool.ntp.org iburst
server 2.centos.pool.ntp.org iburst
server 3.centos.pool.ntp.org iburst
  • 新增配置：
ntp1.aliyun.com
ntp2.aliyun.com
ntp3.aliyun.com
ntp4.aliyun.com
ntp5.aliyun.com
ntp6.aliyun.com
ntp7.aliyun.com
  • CentOS 6
    • 重启 NTP 服务：sudo service ntpd start
    • 添加 NTP 自启动：sudo chkconfig ntpd on
  • CentOS 7
    • 重启 NTP 服务：sudo systemctl start ntpd.service
    • 添加 NTP 自启动：sudo systemctl enable ntpd.service

NTP 服务器配置文件常用参数

NTP 服务器配置文件常用参数

  • 该配置解释：
  • 标注 1 是默认内容，我们这里进行了注释。
  • 标注 2 是新增内容，表示使用中国时间校对服务器节点地址。
server 0.cn.pool.ntp.org
server 1.cn.pool.ntp.org
server 2.cn.pool.ntp.org
server 3.cn.pool.ntp.org
  • 我的配置如下 ``` driftfile /var/lib/ntp/drift pidfile /var/run/ntpd.pid logfile /var/log/ntp.log

Access Control Support

restrict default kod nomodify notrap nopeer noquery restrict -6 default kod nomodify notrap nopeer noquery restrict 127.0.0.1 restrict 192.168.0.0 mask 255.255.0.0 nomodify notrap nopeer noquery restrict 172.16.0.0 mask 255.240.0.0 nomodify notrap nopeer noquery restrict 100.64.0.0 mask 255.192.0.0 nomodify notrap nopeer noquery restrict 10.0.0.0 mask 255.0.0.0 nomodify notrap nopeer noquery

local clock

server 127.127.1.0 fudge 127.127.1.0 stratum 10

restrict ntp1.aliyun.com nomodify notrap nopeer noquery restrict ntp1.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp10.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp11.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp12.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp2.aliyun.com nomodify notrap nopeer noquery restrict ntp2.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp3.aliyun.com nomodify notrap nopeer noquery restrict ntp3.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp4.aliyun.com nomodify notrap nopeer noquery restrict ntp4.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp5.aliyun.com nomodify notrap nopeer noquery restrict ntp5.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp6.aliyun.com nomodify notrap nopeer noquery restrict ntp6.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp7.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp8.cloud.aliyuncs.com nomodify notrap nopeer noquery restrict ntp9.cloud.aliyuncs.com nomodify notrap nopeer noquery

server ntp1.aliyun.com iburst minpoll 4 maxpoll 10 server ntp1.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp10.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp11.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp12.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp2.aliyun.com iburst minpoll 4 maxpoll 10 server ntp2.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp3.aliyun.com iburst minpoll 4 maxpoll 10 server ntp3.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp4.aliyun.com iburst minpoll 4 maxpoll 10 server ntp4.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp5.aliyun.com iburst minpoll 4 maxpoll 10 server ntp5.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp6.aliyun.com iburst minpoll 4 maxpoll 10 server ntp6.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp7.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp8.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 server ntp9.cloud.aliyuncs.com iburst minpoll 4 maxpoll 10 ```

  • 启动服务：
    • sudo service ntpd stop（改配置后，先停再启动）
    • sudo service ntpd start

  • 手动更新时间：

    • sudo ntpdate ntp1.aliyun.com

  • 服务加到启动项

    • CentOS 系统：sudo chkconfig ntpd on
    • Ubuntu 系统
      • sudo apt-get install -y sysv-rc-conf
      • sudo sysv-rc-conf ntpd on

NTP 资料

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