CentOS安装时钟同步服务

yum install chrony -y

vim /etc/chrony.conf

cat /etc/chrony.conf | grep -v  "^#" | grep -v "^$"
pool ntp.aliyun.com iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
allow 10.0.0.0/8
local stratum 10
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony


systemctl restart chronyd
systemctl enable chronyd
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yum install chrony -y

vim /etc/chrony.conf

cat /etc/chrony.conf | grep -v  "^#" | grep -v "^$"
pool 10.0.0.20 iburst
driftfile /var/lib/chrony/drift
makestep 1.0 3
rtcsync
keyfile /etc/chrony.keys
leapsectz right/UTC
logdir /var/log/chrony

systemctl restart chronyd ; systemctl enable chronyd
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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               
===============================================================================
^* master01                      3   6    17     7  -2539ns[  -29us] +/-   16ms


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