一、集群環境：
系統：CentOS7-minimal
集群中的兩台主機ip：10.132.226.103/24 10.132.226.104/24
二、CentOS7中時間相關命令timedatectl例子介紹：
1.查看主機中的時間信息：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時間同步開啟 8 RTC in local TZ: yes 9 DST active: n/a
2.查看可獲取的時區：timedatectl list-timezones
1 [root@controller ~]# timedatectl list-timezones 2 Africa/Abidjan 3 Africa/Accra 4 Africa/Addis_Ababa 5 ........
3.設置本地時區：timedatectl set-timezone Asia/Shanghai
1 # timedatectl set-timezone Asia/Shanghai
4.設置時間日期等：
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.將硬件時鍾設置為本地時區：
1 [root@controller ~]# timedatectl set-local-rtc 1
6.將硬件時鍾設置為協調世界時（UTC）：
[root@controller ~]# timedatectl set-local-rtc 0
三、安裝配置chrony
1.主節點安裝：
1 [root@controller ~]# yum install -y chrony
2.主節點配置：編輯 /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等為遠程時間同步服務器可自行更改 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！！！ #此處添加子節點的IP allow 10.132.226.104/24 #~~~~~~~~~~~省略若干~~~~~~~~#
3.主節點重啟NTP服務
1 [root@controller ~]# systemctl enable chronyd.service 2 [root@controller ~]# systemctl start chronyd.service
4.子節點安裝：
1 [root@compute1 ~]# yum install -y chrony
5.子節點配置：編輯 /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 把其他遠程同步節點全部注釋，並添加主節點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、驗證同步服務是否搭建成功：
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前為^? 可能是主節點防火牆開啟，導致子節點無法進行時間同步。
可以也可以通過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 //此處如果為no說明NTP時鍾為開啟 8 RTC in local TZ: yes 9 DST active: n/a
解決方法：關閉主節點防火牆