linux时间同步ntp服务的安装与配置

桃扇骨 2022-06-08 14:43 230阅读 0赞

当我们需要管理多台服务器的时间时，一台一台的修改未免太麻烦了，NTP服务就很好的为我们解决了这个问题！

1.首先安装NTP

[root@localhost /]# yum install ntp -y

2.修改NTP配置文件，添加NTP服务器的网络位置    /etc/ntp.conf

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# 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 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 ::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 192.168.1.1 iburst       #目标服务器网络位置
    #server 1.centos.pool.ntp.org iburst     #一下三个是CentOS官方的NTP服务器，我们注释掉
    #server 2.centos.pool.ntp.org iburst
    #server 3.centos.pool.ntp.org iburst
    
    #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
    
    # Disable the monitoring facility to prevent amplification attacks using ntpdc
    # monlist command when default restrict does not include the noquery flag. See
    # CVE-2013-5211 for more details.
    # Note: Monitoring will not be disabled with the limited restriction flag.
    disable monitor

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保存退出

3.启动服务并设置开启自启

[root@localhost /]# systemctl start ntpd.service　　#启动服务
    [root@localhost /]# systemctl enable ntpd.service　　#设置为开机启动

4.查看运行状态

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\[root@localhost /\]\# systemctl status ntpd.service  
● ntpd.service - Network Time Service  
   Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled; vendor preset: disabled)  
   Active: active (running) since 二 2016-10-11 13:34:11 CST; 8min ago  
 Main PID: 6497 (ntpd)  
   CGroup: /system.slice/ntpd.servicess  
           └─6497 /usr/sbin/ntpd -u ntp:ntp -g

10月 11 13:34:11 localhost.localdomain ntpd\[6497\]: Listen and drop on 1 v6wildcard :: UDP 123  
10月 11 13:34:11 localhost.localdomain ntpd\[6497\]: Listen normally on 2 lo 127.0.0.1 UDP 123  
10月 11 13:34:11 localhost.localdomain ntpd\[6497\]: Listen normally on 3 eno16777736 192.168.100.100 UDP 123

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可以看到当前的状态为 running

[copycode.gif]: /images/20220608/cd53c9dce72843469cd718f4809ff5c0.png