chrony 是网络时间协议(NTP)的通用实现。
chrony 包含两个程序:chronyd 是一个可以在启动时启动的守护程序。chronyc 是一个命令行界面程序,用于监视 chronyd 的性能并在运行时更改各种操作参数。
与其它时间同步软件的对比:https://chrony.tuxfamily.org/comparison.html
yum -y install chrony systemctl enable chronyd systemctl start chronyd vim /etc/chrony.conf
chrony.conf 默认配置
# 使用 pool.ntp.org 项目中的公共服务器。以server开,理论上想添加多少时间服务器都可以。 # 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 # 根据实际时间计算出服务器增减时间的比率,然后记录到一个文件中,在系统重启后为系统做出最佳时间补偿调整。 # Record the rate at which the system clock gains/losses time. driftfile /var/lib/chrony/drift # 如果系统时钟的偏移量大于1秒,则允许系统时钟在前三次更新中步进。 # Allow the system clock to be stepped in the first three updates if its offset is larger than 1 second. makestep 1.0 3 # 启用实时时钟(RTC)的内核同步。 # Enable kernel synchronization of the real-time clock (RTC). rtcsync # 通过使用 hwtimestamp 指令启用硬件时间戳 # 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 # 指定 NTP 客户端地址,以允许或拒绝连接到扮演时钟服务器的机器 # 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 # 指定包含 NTP 身份验证密钥的文件。 # Specify file containing keys for NTP authentication. #keyfile /etc/chrony.keys # 指定日志文件的目录。 # Specify directory for log files. logdir /var/log/chrony # 选择日志文件要记录的信息。 # Select which information is logged. #log measurements statistics tracking
ntp 服务器:https://www.cnblogs.com/jhxxb/p/10579816.html
chrony.conf 修改两处
# Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). server s1a.time.edu.cn iburst server ntp.aliyun.com iburst # Allow NTP client access from local network. allow 192.168.8.0/24
开启同步
systemctl enable chronyd systemctl restart chronyd # 查看时间同步状态 timedatectl status # 开启网络时间同步 timedatectl set-ntp true
chrony.conf 修改两处
# Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). server 192.168.8.5 iburst # Allow NTP client access from local network. allow 192.168.8.5
开启同步
systemctl enable chronyd systemctl restart chronyd # 查看时间同步状态 timedatectl status # 开启网络时间同步 timedatectl set-ntp true
chronyc 用法
# 查看 ntp_servers chronyc sources -v # 查看 ntp_servers 状态 chronyc sourcestats -v # 查看 ntp_servers 是否在线 chronyc activity -v # 查看 ntp 详细信息 chronyc tracking -v
修改时区
# 查看日期时间、时区及 NTP 状态 timedatectl # 查看时区列表 timedatectl list-timezones timedatectl list-timezones | grep -E "Asia/S.*" # 修改时区 timedatectl set-timezone Asia/Shanghai # 修改日期时间(可以只修改其中一个) timedatectl set-time "2019-09-19 15:50:20" # 开启 NTP timedatectl set-ntp true/flase
https://chrony.tuxfamily.org/
https://www.linuxprobe.com/centos7-chrony-time.html
https://www.zfl9.com/chrony.html