centos8 chrony时间服务器

安装服务

yum install chrony -y
systemctl enable chronyd  ###设置开机默认启动
           

修改配置

[[email protected] ~]#  vi /etc/chrony.conf
# 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 time1.aliyun.com iburst
#pool time2.aliyun.com iburst
#pool time3.aliyun.com iburst
server time1.aliyun.com iburst  ###外部时间服务器
server time2.aliyun.com iburst
server time3.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
allow all     ###允许任何链接

# 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
           

启动服务

systemctl restart chronyd

配置防火墙

firewall-cmd --zone=public --add-port=123/udp --permanent
firewall-cmd --reload
           

其他服务器测试

安装启动服务器

yum install chrony -y
systemctl enable chronyd  ###设置开机默认启动

           

修改配置

vi /etc/chrony.conf
           

注释原有配置，修改为刚才安装服务器

#pool 2.centos.pool.ntp.org iburst
server 100.40.10.3 iburst
           

测试同步成功

[[email protected] ~]# 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               
===============================================================================
^? pool-100-40-10-3.prvdri.>     0  10     0     -     +0ns[   +0ns] +/-    0ns
           

引用

https://blog.csdn.net/dhcp_zhao/article/details/102926399#chronyconf_13

https://www.cnblogs.com/lianglab/p/14088050.html