安裝
sudo apt-get install ntp
修改ntp.conf配置文件
sudo vi /etc/ntp.conf
修改為如下內容
# Enable this if you want statistics to be logged. #statsdir /var/log/ntpstats/ #也可以開啟NTP log statistics loopstats peerstats clockstats filegen loopstats file loopstats type day enable filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable # Specify one or more NTP servers. # Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board # on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for # more information. server 120.24.166.46 # 阿里雲NTP Server----------- server 127.127.1.0 # 如果公網NTP不可用時，將使用Local時間作為NTP服務提供給NTP Client。 # Use Ubuntu's ntp server as a fallback. server ntp.ubuntu.com # Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for # details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions> # might also be helpful. # # Note that "restrict" applies to both servers and clients, so a configuration # that might be intended to block requests from certain clients could also end # up blocking replies from your own upstream servers. # By default, exchange time with everybody, but don't allow configuration. restrict -4 default kod notrap nomodify nopeer noquery restrict -6 default kod notrap nomodify nopeer noquery restrict 192.168.20.0 mask 255.255.255.0 nomodify # 允許的NTP Client網段--------------- # Local users may interrogate the ntp server more closely. restrict 127.0.0.1 restrict ::1
重啟NTP服務，並在客戶端驗證
root@ntpserver:~/ceph-cluster# service ntp restart * Stopping NTP server ntpd [ OK ] * Starting NTP server ntpd [ OK ] root@ntpclient:/etc/ceph# ntpdate ntpserver 14 Jan 10:55:51 ntpdate[5230]: adjust time server 192.168.20.177 offset 0.209691 sec root@ntpclient:/etc/ceph#
觀察時間同步狀況：
ntpq -p
remote：本機和上層ntp的ip或主機名，“+”表示優先，“*”表示次優先
refid：參考上一層ntp主機地址
st：stratum階層
when：多少秒前曾經同步過時間
poll：下次更新在多少秒后
reach：已經向上層ntp服務器要求更新的次數
delay：網絡延遲
offset：時間補償
jitter：系統時間與bios時間差
查看ntpd進程的狀態
【命令】watch "ntpq -p"
第一列中的字符指示源的質量。星號 ( * ) 表示該源是當前引用。
remote：列出源的 IP 地址或主機名。
when：指出從輪詢源開始已過去的時間（秒）。
poll：指出輪詢間隔時間。該值會根據本地時鍾的精度相應增加。
reach：是一個八進制數字，指出源的可存取性。值 377 表示源已應答了前八個連續輪詢。
offset：是源時鍾與本地時鍾的時間差（毫秒）。
設置開機啟動
chkconfig ntpd on
參考：
https://www.cnblogs.com/vincenshen/p/6284933.html
https://blog.csdn.net/willinge/article/details/79928726
https://www.cnblogs.com/quchunhui/p/7658853.html
https://blog.csdn.net/jinyuxiaoqiang/article/details/81634827
https://www.cnblogs.com/quchunhui/p/7658853.html