时间同步不正常，处理chronyd确保时间一致
[root@jyc ~]# timedatectl status
Local time: Fri 2023-07-28 08:53:34 CST
Universal time: Fri 2023-07-28 00:53:34 UTC
RTC time: Fri 2023-07-28 00:53:34
Time zone: Asia/Shanghai (CST, +0800)
NTP enabled: no
NTP synchronized: yes
RTC in local TZ: no
DST active: n/a
[root@jyc ~]# timedatectl set-ntp true #启用时间同步服务
[root@jyc ~]# timedatectl status
Local time: Fri 2023-07-28 08:54:16 CST
Universal time: Fri 2023-07-28 00:54:16 UTC
RTC time: Fri 2023-07-28 00:54:16
Time zone: Asia/Shanghai (CST, +0800)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: n/a
[root@jyc ~]# date
Fri Jul 28 08:54:18 CST 2023
[root@jyc ~]# chronyc sources -v
210 Number of sources = 1
.-- 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
===============================================================================
^* 192.168.0.2 5 9 377 315 -313us[ -314us] +/- 12ms
[root@jyc ~]# cat /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
server 192.168.0.2 iburst #填写时间同步服务器的地址
# 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
# Specify directory for log files.
logdir /var/log/chrony
# Select which information is logged.
#log measurements statistics tracking
[root@jyc ~]# systemctl enable chronyd
[root@jyc ~]# systemctl restart chronyd
[root@jyc ~]# timedatectl status
Local time: Fri 2023-07-28 09:09:26 CST
Universal time: Fri 2023-07-28 01:09:26 UTC
RTC time: Fri 2023-07-28 01:09:26
Time zone: Asia/Shanghai (CST, +0800)
NTP enabled: yes
NTP synchronized: yes
RTC in local TZ: no
DST active: n/a
[root@jyc ~]# date
Fri Jul 28 09:09:30 CST 2023
[root@jyc ~]# chronyc -a makestep #强制时间同步
200 OK
[root@jyc ~]# chronyc tracking
Reference ID : 75080002 (dns2.online.tj.cn)
Stratum : 6
Ref time (UTC) : Fri Jul 28 01:16:55 2023
System time : 0.000004204 seconds slow of NTP time
Last offset : -0.000005968 seconds
RMS offset : 0.000892102 seconds
Frequency : 31.983 ppm slow
Residual freq : -0.001 ppm
Skew : 0.176 ppm
Root delay : 0.000670372 seconds
Root dispersion : 0.011242659 seconds
Update interval : 64.5 seconds
Leap status : Normal
[root@jyc ~]# chronyc sources -v
210 Number of sources = 1
.-- 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
===============================================================================
^* dns1.online.tj.cn 5 6 377 53 -53us[ -85us] +/- 11ms
[root@jyc ~]# ping dns1.online.tj.cn #ip变成域名，并且还不通，但同步却正常???后边解释dns解析问题
ping: dns1.online.tj.cn: Name or service not known
[root@jyc ~]# head /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
server 192.168.0.2 iburst
# Record the rate at which the system clock gains/losses time.
driftfile /var/lib/chrony/drift
由于配置了dns解析所以引起上述问题：（把resolv.conf文件删除掉或注释掉即可解决）
[root@jyc ~]# cat /etc/resolv.conf
nameserver 114.114.114.114
[root@jyc ~]# nslookup 192.168.0.2 （只是例子）
发现解析到了上述的域名dns1.online.tj.cn
[root@jyc ~]# ping www.baidu.com
PING www.a.shifen.com (110.242.68.4) 56(84) bytes of data.
64 bytes from 110.242.68.4 (110.242.68.4): icmp_seq=1 ttl=54 time=7.63 ms
64 bytes from 110.242.68.4 (110.242.68.4): icmp_seq=2 ttl=54 time=7.61 ms
64 bytes from 110.242.68.4 (110.242.68.4): icmp_seq=3 ttl=54 time=7.62 ms
^C
--- www.a.shifen.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 7.617/7.625/7.634/0.101 ms
[root@jyc ~]# mv /etc/resolv.conf /etc/resolv.conf.bak
[root@jyc ~]# systemctl restart chronyd
[root@jyc ~]# chronyc sourcestats -v
210 Number of sources = 1
.- Number of sample points in measurement set.
/ .- Number of residual runs with same sign.
| / .- Length of measurement set (time).
| | / .- Est. clock freq error (ppm).
| | | / .- Est. error in freq.
| | | | / .- Est. offset.
| | | | | | On the -.
| | | | | | samples. \
| | | | | | |
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
192.168.0.2 4 4 6 -3.418 480.043 -7453ns 86us
最后修改时间：2023-07-28 09:47:07
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