linux服务器修改时间为北京时间

青旅半醒 2022-05-30 10:11 515阅读 0赞

删除本地的时间文件，加入上海时区  
rm -rf /etc/localtime

ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime  
系统第一次使用这两个命令之后系统时间变成北京时间了，但是我后面用date -s "2018-03-09 22:25:00" 改了时间之后，又想同步一下改成北京时间，于是又执行上面两行的命令，最后发现时间没有变，时间还是我用date改的那个时间，，我估计可能是存在时区的缓存问题，于是  
/usr/sbin/ntpdate ntp1.aliyun.com 命令同步下阿里的时间，发现报错

“the NTP socket is in use, exiting“，这个错误比较好解决，就是说ntpd服务启动了，然后我关掉了service ntpd stop，然后再执行/usr/sbin/ntpdate ntp1.aliyun.com就没问题了，然后时间就正确了.

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1、这里说一下怎么把自己的一台服务器当成时间服务器，可以让别的服务器来同步，当然了，首先需要保证当时间服务器的这台机器的时间是正确的。

2、搭建步骤，我这里是centos系统，不同系统可能会不一样  
修改vi /etc/ntp.conf 文件，可参考

[root@learn ~]# cat /etc/ntp.conf 
    # 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
    restrict 192.168.37.255 mask 255.255.255.0 nomodify notrap
    ##开启上面这一行，去掉注释，  这里192.168.37.255是你电脑广播地址，在ifconfig命令中能看到【inet addr:192.168.37.141  Bcast:192.168.37.255  Mask:255.255.255.0】
    #Use public servers from the pool.ntp.org project.
    #Please consider joining the pool (http://www.pool.ntp.org/join.html).
    #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
    #由于是把自己电脑机器当成ntpd服务器，不需要连接外网，所以注释下上面四行，  添加下面两行，
    server 127.127.1.0 #local clock
    fudge 127.127.1.0 startnum 10
    #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
    
    # 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
    
    # Specify the key identifiers which are trusted.
    #trustedkey 4 8 42
    
    # Specify the key identifier to use with the ntpdc utility.
    #requestkey 8
    
    # Specify the key identifier to use with the ntpq utility.
    #controlkey 8
    
    # Enable writing of statistics records.
    #statistics clockstats cryptostats loopstats peerstats

3、修改完成开启ntpd服务器

[root@learn ~]# sudo service ntpd start  --开启ntpd服务器
    [root@learn ~]# sudo chkconfig ntpd on --设置ntpd服务

4、其他机器可通过ntpdate命令来同步时间

/usr/sbin/ntpdate learn.hadoop1.com --这里的learn.hadoop1.com是我的机器主机名