• linux设置自动同步服务器时间


    最近遇到一个问题,由于两台服务器时间的问题,经常导致用户登录由于时间差问题而报错,再三百度,最后整理了一下修改linux定时同步的操作(本方法适用于有自己时间服务器,没有的只限于借鉴)

    首先确认,我们的服务是否已经安装了ntp服务

    如果没有安装,需要先安装ntp服务

    安装完ntp之后,编辑ntp.conf  

    vi /etc/ntp.conf

    可以看到文件中内容

    # 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 可以看到修改标出来的ip地址,改为自己的时间服务器地址,也可以是域名

    修改后保存退出

    命令行输入

    crontab -e
    

      设置定时任务,其这里设置的是

    * * */1 * * /usr/sbin/ntpdate 127.0.0.1 >> /home/logs/ntpd.log
    

     同样修改ip地址 
    然后创建日志文件夹用来存放日志

    mkdir /home/logs
    

      ok 大功告成,过几分钟在日志文件夹可以看到日志文件,浏览会发现,时间差不超过0.01s .一般来说是够用了的

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  • 原文地址:https://www.cnblogs.com/hebin-pc/p/11592746.html
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