搭建本地私有云之时钟对准NTP

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这个系列是笔者在为实验室搭建本地私有云的过程中所记载的笔记,看起来会比较杂乱 :)

在搭建本地私有云的过程中,保证所有系统之间的时钟同步是非常重要的,因此为本地私有云维护一个专门的NTP server也是非常有必要的

搭建NTP服务

安装NTP

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sudo apt install ntp

修改ntp server虚拟主机的配置文件

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sudo vim /etc/ntp.conf
-----------------------
restrict -4 default notrap nomodify nopeer
restrict -6 default notrap nomodify nopeer

restrict 127.0.0.1
restrict ::1

driftfile /var/lib/ntp/drift/ntp.drift # path for drift file

logfile   /var/log/ntp		# alternate log file
logconfig =syncall +clockall +sysevents

keys /etc/ntp.keys		# path for keys file
trustedkey 1			# define trusted keys
requestkey 1			# key (7) for accessing server variables
controlkey 1			# key (6) for accessing server variables

restrict 0.cn.pool.ntp.org notrap nomodify noquery
pool 0.cn.pool.ntp.org iburst minpoll 4 maxpoll 7
restrict 1.cn.pool.ntp.org notrap nomodify noquery
pool 1.cn.pool.ntp.org iburst minpoll 4 maxpoll 7
restrict 2.cn.pool.ntp.org notrap nomodify noquery
pool 2.cn.pool.ntp.org iburst minpoll 4 maxpoll 7
restrict 3.cn.pool.ntp.org notrap nomodify noquery
pool 3.cn.pool.ntp.org iburst minpoll 4 maxpoll 7

server ntp.fudan.edu.cn iburst minpoll 4 maxpoll 7
server time1.google.com iburst minpoll 4 maxpoll 7
server time2.google.com iburst minpoll 4 maxpoll 7
server time3.google.com iburst minpoll 4 maxpoll 7
server time4.google.com iburst minpoll 4 maxpoll 7
-----------------------

配置ntp服务

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sudo systemctl enable ntp.service
sudo systemctl start ntp.service
# or
sudo systemctl restart ntp.service

查看NTP时间对准情况

重点关注offset和jitter两个参数,一般小于0.1就算校准了

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watch -n 1 ntpq -pn
-----------------------
remote           refid              st  t   when poll   reach   delay   offset  jitter
======================================================================================
*ntp.sonnyhcl. 23.71.59.65        3   u   18   32     377     0.364   -0.250   0.043
----------------------

NTP客户端配置

当我们在本地私有云中新添加一个虚拟机,需要为它配置对应的ntp server时,以chrony为例我们需要做

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sudo vim /etc/chrony.conf
-------------------------
server ntp.sonnyhcl.top iburst minpoll 4 maxpoll 7
-------------------------

然后查看时钟对准情况

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watch -n 1 ntpq -pn