一、集群环境：
系统：CentOS7-minimal
集群中的两台主机ip：10.132.226.103/24 10.132.226.104/24
二、CentOS7中时间相关命令timedatectl例子介绍：
1.查看主机中的时间信息：timedatectl
1 [root@controller ~]# timedatectl 2 Local time: Tue 2018-07-24 00:27:53 CST 3 Universal time: Mon 2018-07-23 16:27:53 UTC 4 RTC time: Tue 2018-07-24 00:27:53 5 Time zone: Asia/Shanghai (CST, +0800) 6 NTP enabled: yes 7 NTP synchronized: yes //NTP时间同步开启 8 RTC in local TZ: yes 9 DST active: n/a
2.查看可获取的时区：timedatectl list-timezones
1 [root@controller ~]# timedatectl list-timezones 2 Africa/Abidjan 3 Africa/Accra 4 Africa/Addis_Ababa 5 ........
3.设置本地时区：timedatectl set-timezone Asia/Shanghai
1 # timedatectl set-timezone Asia/Shanghai
4.设置时间日期等：
1 [root@controller ~]# timedatectl set-time "2018-07-19 18:08:08" 2 [root@controller ~]# timedatectl set-time "2018-07-19" 3 [root@controller ~]# timedatectl set-time "18:08:08"
5.将硬件时钟设置为本地时区：
1 [root@controller ~]# timedatectl set-local-rtc 1
6.将硬件时钟设置为协调世界时（UTC）：
[root@controller ~]# timedatectl set-local-rtc 0
三、安装配置chrony
1.主节点安装：
1 [root@controller ~]# yum install -y chrony
2.主节点配置：编辑 /etc/chrony.conf文件
[root@controller ~]# vim /etc/chrony.conf # Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). #以下0.centos.pool.ntp.org等为远程时间同步服务器可自行更改 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 #~~~~~~~~~~~省略若干~~~~~~~~# # Allow NTP client access from local network. #allow 192.168.0.0/16 #修改！！！ #此处添加子节点的IP allow 10.132.226.104/24 #~~~~~~~~~~~省略若干~~~~~~~~#
3.主节点重启NTP服务
1 [root@controller ~]# systemctl enable chronyd.service 2 [root@controller ~]# systemctl start chronyd.service
4.子节点安装：
1 [root@compute1 ~]# yum install -y chrony
5.子节点配置：编辑 /etc/chrony.conf文件
1 [root@compute1 etc]# vim /etc/chrony.conf 2 3 # Use public servers from the pool.ntp.org project. 4 # Please consider joining the pool (http://www.pool.ntp.org/join.html). 5 #修改 把其他远程同步节点全部注释，并添加主节点ip或者hosts 6 #server 0.centos.pool.ntp.org iburst 7 #server 1.centos.pool.ntp.org iburst 8 #server 2.centos.pool.ntp.org iburst 9 #server 3.centos.pool.ntp.org iburst 10 server controller iburst
四、验证同步服务是否搭建成功：
1.使用命令 chronyc sources
1 [root@compute1 etc]# chronyc sources 2 210 Number of sources = 1 3 MS Name/IP address Stratum Poll Reach LastRx Last sample 4 =============================================================================== 5 ^* controller 3 6 377 22 -5232us[-6125us] +/- 47ms
注意：如果controller前为^? 可能是主节点防火墙开启，导致子节点无法进行时间同步。
可以也可以通过timedatectl命令查看：
1 [root@compute1 etc]# timedatectl 2 Local time: Mon 2018-07-23 23:41:49 CST 3 Universal time: Mon 2018-07-23 15:41:49 UTC 4 RTC time: Mon 2018-07-23 23:41:49 5 Time zone: Asia/Shanghai (CST, +0800) 6 NTP enabled: yes 7 NTP synchronized: yes //此处如果为no说明NTP时钟为开启 8 RTC in local TZ: yes 9 DST active: n/a
解决方法：关闭主节点防火墙