使用Almalinux 8 搭建NTP服务器chrony

chrony官方网站

https://chrony-project.org/

1、更新系统

sudo dnf update
sudo dnf install epel-release

2、在AlmaLinux上安装NTP服务器

dnf install chrony

systemctl enable chronyd
systemctl start chronyd

3、 配置服务器

vim /etc/chrony.conf

添加NTP服务器地址，如
server ntp.aliyun.com iburst
server ntp1.aliyun.com iburst
server ntp2.aliyun.com iburst
server ntp.ntsc.ac.cn iburst

#重启服务
systemctl restart chronyd

4、查看状态

#查看时间源同步状态
chronyc sourcestats -v

#查看当前时间
date

#查看时间源是否在线
chronyc activity -v

# 查看时间源状态
chronyc sources -v

  .-- Source mode  '^' = server, '=' = peer, '#' = local clock.
 / .- Source state '*' = current best, '+' = combined, '-' = not combined,
| /             'x' = may be in error, '~' = too variable, '?' = unusable.
||                                                 .- xxxx [ yyyy ] +/- zzzz
||      Reachability register (octal) -.           |  xxxx = adjusted offset,
||      Log2(Polling interval) --.      |          |  yyyy = measured offset,
||                                \     |          |  zzzz = estimated error.
||                                 |    |           \
MS Name/IP address         Stratum Poll Reach LastRx Last sample               
===============================================================================
^* dns2.synet.edu.cn             1   6   363    58    +11ms[  +11ms] +/-   24ms
^+ 139.199.214.202               2   6   377    55  +1379us[+1379us] +/-   39ms
^- stratum2-1.ntp.mow01.ru.>     2   6   377    59    +17ms[  +17ms] +/-   79ms
^- 119.28.206.193                2   6   176   189  +3506us[+3349us] +/-   54ms
^+ 203.107.6.88                  2   6   377    60  -8530us[-8434us] +/-   21ms
^+ 120.25.115.20                 2   6   277   118  +2670us[+2771us] +/-   26ms
^- 114.118.7.161                 1   7    25    56    +29ms[  +29ms] +/-   43ms

5、配置防火墙

sudo firewall-cmd --permanent --add-service=ntp
sudo firewall-cmd --reload