最近遇到一個問題，由於兩台服務器時間的問題，經常導致用戶登錄由於時間差問題而報錯，再三百度，最后整理了一下修改linux定時同步的操作（本方法適用於有自己時間服務器，沒有的只限於借鑒）
首先確認，我們的服務是否已經安裝了ntp服務
如果沒有安裝，需要先安裝ntp服務
安裝完ntp之后，編輯ntp.conf
vi /etc/ntp.conf
可以看到文件中內容
# For more information about this file, see the man pages # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5). driftfile /var/lib/ntp/drift # Permit time synchronization with our time source, but do not # permit the source to query or modify the service on this system. restrict default kod nomodify notrap nopeer noquery restrict -6 default kod nomodify notrap nopeer noquery # Permit all access over the loopback interface. This could # be tightened as well, but to do so would effect some of # the administrative functions. restrict 127.0.0.1 restrict -6 ::1 # Hosts on local network are less restricted. #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap # Use public servers from the pool.ntp.org project. # Please consider joining the pool (http://www.pool.ntp.org/join.html). server 127.0.0.1 #server 1.centos.pool.ntp.org #server 2.centos.pool.ntp.org #broadcast 192.168.1.255 autokey # broadcast server #broadcastclient # broadcast client #broadcast 224.0.1.1 autokey # multicast server #multicastclient 224.0.1.1 # multicast client #manycastserver 239.255.254.254 # manycast server #manycastclient 239.255.254.254 autokey # manycast client # Undisciplined Local Clock. This is a fake driver intended for backup # and when no outside source of synchronized time is available.
# local clock #fudge 127.127.1.0 stratum 10 # Enable public key cryptography. #crypto includefile /etc/ntp/crypto/pw # Key file containing the keys and key identifiers used when operating # with symmetric key cryptography. keys /etc/ntp/keys
在文件中 可以看到
修改標出來的ip地址，改為自己的時間服務器地址，也可以是域名
修改后保存退出
命令行輸入
crontab -e
設置定時任務，其這里設置的是
* * */1 * * /usr/sbin/ntpdate 127.0.0.1 >> /home/logs/ntpd.log
同樣修改ip地址
然后創建日志文件夾用來存放日志
mkdir /home/logs
ok 大功告成，過幾分鍾在日志文件夾可以看到日志文件，瀏覽會發現，時間差不超過0.01s .一般來說是夠用了的