CentOS8时间同步
概述
最近在CentOs8操作时间同步，却发现在CentOS8中默认已经不再支持ntpd软件包，同时也无法通过官方软件仓库安装， CentOS8上使用Chrony配置NTP服务器，用于同步时间。 它有两个程序，chrony和chronyd， chronyd是守护进程 ，chrony是一个命令行界面程序，可以用来监控chronyd的性能，并修改各种操作参数。
安装chrony
系统会默认安装并启动，如果系统不存在则需要安装此工具库。
- 仓库中直接安装
1 | dnf -y install chrony |
- 启动守护进程
1 | systemctl enable –now chronyd |
时间同步配置
设置时区
- 联网的情况下一般设置时区后会通过网络同步时间
1 | timedatectl set-timezone "Asia/Shanghai" |
配置chrony.conf
修改配置加入aliyun pool网络时间，也可以加入多个pool服务器
1
vim /etc/chrony.conf
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40># Use public servers from the pool.ntp.org project.
># Please consider joining the pool (http://www.pool.ntp.org/join.html).
>pool 2.centos.pool.ntp.org iburst
>pool ntp.aliyun.com iburst
>
># Record the rate at which the system clock gains/losses time.
>driftfile /var/lib/chrony/drift
>
># Allow the system clock to be stepped in the first three updates
># if its offset is larger than 1 second.
>makestep 1.0 3
>
># Enable kernel synchronization of the real-time clock (RTC).
>rtcsync
>
># Enable hardware timestamping on all interfaces that support it.
>#hwtimestamp *
>
># Increase the minimum number of selectable sources required to adjust
># the system clock.
>#minsources 2
>
># Allow NTP client access from local network.
>#allow 192.168.0.0/16
>
># Serve time even if not synchronized to a time source.
>#local stratum 10
>
># Specify file containing keys for NTP authentication.
>keyfile /etc/chrony.keys
>
># Get TAI-UTC offset and leap seconds from the system tz database.
>leapsectz right/UTC
>
># Specify directory for log files.
>logdir /var/log/chrony
>
># Select which information is logged.
>#log measurements statistics tracking
>重新加载配置
1
systemctl restart chronyd.service
时间同步
执行时间同步命令
1
chronyc sources -v
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19>[root@k8smaster ~]# chronyc sources -v
>210 Number of sources = 5
>
> .-- Source mode '^' = server, '=' = peer, '#' = local clock.
> / .- Source state '*' = current synced, '+' = combined , '-' = not combined,
>| / '?' = unreachable, 'x' = time may be in error, '~' = time too variable.
>|| .- 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
>===============================================================================
>^- ntp5.flashdance.cx 2 6 377 6 +8255us[+8255us] +/- 139ms
>^- 185.216.231.25 2 7 13 6 +10ms[ +10ms] +/- 98ms
>^- 119.28.206.193 2 6 377 9 +1016us[+1001us] +/- 62ms
>^* dns1.synet.edu.cn 2 6 377 8 -1423us[-1438us] +/- 9294us
>^+ 203.107.6.88 2 6 377 7 +2107us[+2107us] +/- 17ms
>
查看时间
查看当前系统时间
1
date
