安裝

yum install chrony -y

配置

# 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 3.centos.pool.ntp.org iburst
server 192.168.0.1iburst

# 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 192.168.0.0/24

# 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

檢視

chronyc sources -v
timedatectl

一鍵命令

按需要修改

#伺服器需要新增
sed -i '$a\local stratum 10' /etc/chrony.conf
sed -i '$a\allow' /etc/chrony.conf
#客戶端需要新增，修改對應伺服器ip
systemctl stop firewalld
systemctl disable firewalld
setenforce 0
sed -i '/^SELINUX=/cSELINUX=disabled' /etc/selinux/config
getenforce
yum install chrony -y
sed -i '$a\server 192.168.0.2 iburst' /etc/chrony.conf
sed -i 's/^server 0.centos.pool.ntp.org iburst/#server 0.centos.pool.ntp.org iburst/g' /etc/chrony.conf
sed -i 's/^server 1.centos.pool.ntp.org iburst/#server 1.centos.pool.ntp.org iburst/g' /etc/chrony.conf
sed -i 's/^server 2.centos.pool.ntp.org iburst/#server 2.centos.pool.ntp.org iburst/g' /etc/chrony.conf
sed -i 's/^server 3.centos.pool.ntp.org iburst/#server 3.centos.pool.ntp.org iburst/g' /etc/chrony.conf
systemctl restart chronyd
systemctl enable chronyd
chronyc sources -v
sleep 4
chronyc sources -v
timedatectl