centos系统chrony时间同步

centos系统chrony时间同步

概要

chrony 是网络时间协议（Network Time Protocol ）的通用实现。它不但可以提供保持系统时间与 NTP 时钟服务器同步的服务，还能作为 NTP 服务器对其他服务器提供时间同步服务。

chrony 有两个核心组件：

• chronyd　　守护进程，主要用于调整内核中运行的系统时间和时间服务器同步
• chronyc　　命令行界面程序，让用户能够对 chronyd 的性能进行监控以及改变各种参数

安装

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 192.168.0.1 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 192.168.0.0/24

# 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

查看

chronyc sources -v
timedatectl

timedatectl时间设置命令

管理系统时间
timedatectl +　　　

• status　　　　　　 ##显示当前时间信息
• set-time　　　　　 ##设定当前时间
• set-timezone　　　 ##设定当前时区
• set-local-rtc 0|1 　　##设定是否使用utc时间
• list-timezones　　　##查看支持的所有时区

一键命令

按需要修改

#服务器需要添加
sed -i '$a\local stratum 10' /etc/chrony.conf
sed -i '$a\allow' /etc/chrony.conf 
#客户端需要添加，修改对应服务器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

参考文章：https://blog.csdn.net/weixin_43936969/article/details/102628813