centos 系统使用chronyd 进行局域网时间同步

注意: 没有编写程序介绍说明, 纯操作流程

1. 安装chrony 程序

   sudo yum install -y chrony
   

2. 编辑配置文件 /etc/chronyd.conf

   ## 注意修改配置文件后需要重启才能生效
   vim /etc/chrony.conf
   

3. 添加配置信息

   ## 设置为阿里云 ntp 时间同步
   server ntp1.aliyun.com iburst
   server ntp2.aliyun.com iburst
   server ntp3.aliyun.com iburst
   
   ## 允许网段配置
   allow 110.0.0.0/16
   

4. 全部配置信息(局域网同步服务器)

   # 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
   
   ## 设置为阿里云 ntp 时间同步
   server ntp1.aliyun.com iburst
   server ntp2.aliyun.com iburst
   server ntp3.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.
   ## 允许网段配置
   allow 0.0.0.0/16
   
   # Serve time even if not synchronized to a time source.
   #local stratum 0
   
   # 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
   
   

5. 从节点服务器配置

   ## 设置主要同步服务器id 例如: 110.0.100.136
   server 110.0.100.136 iburst
   

6. chrony相关命令

   #### centos7 ####
   ## 查看服务状态
   sudo systemctl status chronyd 
   
   ## 启动服务
   sudo systemctl start chronyd
   
   ## 停止服务
   sudo systemctl stop chronyd
   
   ## 重启服务
   sudo systemctl restart chronyd
   
   ## 检验时间同步状态
   sudo chronyc tracking
   #### centos7 ####
   
   #### centos6.5 ####
   ## 只需要将 systemctl 改为 service 即可,并且 操作动作放置后面
   ## 例如: 启动服务
   ## sudo service chronyd start
   #### centos6.5 ####
   

7. 设置为开机启动()

   #### centos7 ####
   ## 设置开机启动
   sudo systemctl enable chronyd
   
   ## 查看是否设置成开机启动
   sudo systemctl is-enabled chronyd
   #### centos7 ####
   
   
   #### centos6.5 ####
   ## 设置开机启动
   sudo chkconfig chronyd on
   
   ## 查看是否设置成开机启动
   systemctl list-unit-files --type=service | grep chronyd
   #### centos6.5 ####
   

8. 检查时间

   ## 简单显示出当前时间
   date
   
   ## 详细显示日期时间等信息
   timedatectl
   
   

遇到的问题及解决方案

1. 执行yum install chrony -y

   ##无法检索镜像列表问题
   
   ## 解决方案- 更换镜像源(阿里云镜像源)
   sudo cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
   
   sudo curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   
   ## 清理并重建缓存
   sudo yum clean all
   sudo yum makecache