实现基于LAN的NTP时钟同步

朱雀 2022-11-27 08:59 196阅读 0赞

# 1.搭建LAN环境 #

# 2.选取某个节点作为 NTP服务器 #

例如 选取 192.168.1.149节点部署NTP,配置为NTP服务器

#相关命令
    sudo apt-get install ntp #安装
    sudo systemctl enable ntpd #自启动
    systemctl is-enabled ntp #检查自启动是否开启
    sudo systemctl start ntp #手启动
    service ntp status #ntp 状态
    ntpq -p #ntp状态
    netstat -tlunp | grep ntp #查看启动的端口(123)
    firewall-cmd --zone=public --add-port=123/udp --permanent && firewall-cmd --reload #开放端口 123

#ntp.conf
    # /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
    
    driftfile /var/lib/ntp/ntp.drift
    
    # Leap seconds definition provided by tzdata
    leapfile /usr/share/zoneinfo/leap-seconds.list
    
    # Enable this if you want statistics to be logged.
    #statsdir /var/log/ntpstats/
    
    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.
    #pool 0.ubuntu.pool.ntp.org iburst
    #pool 1.ubuntu.pool.ntp.org iburst
    #pool 2.ubuntu.pool.ntp.org iburst
    #pool 3.ubuntu.pool.ntp.org iburst
    
    # Use Ubuntu's ntp server as a fallback.
    #pool 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 limited
    restrict -6 default kod notrap nomodify nopeer noquery limited
    
    # Local users may interrogate the ntp server more closely.
    restrict 127.0.0.1
    restrict ::1
    
    # Needed for adding pool entries
    restrict source notrap nomodify noquery
    
    # Clients from this (example!) subnet have unlimited access, but only if
    # cryptographically authenticated.
    #restrict 192.168.123.0 mask 255.255.255.0 notrust
    restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap #放行局域网来源，允许192.168.1.x网段中的服务器访问本ntp服务器进行时间同步
    
    
    # If you want to provide time to your local subnet, change the next line.
    # (Again, the address is an example only.)
    #broadcast 192.168.123.255
    
    # If you want to listen to time broadcasts on your local subnet, de-comment the
    # next lines.  Please do this only if you trust everybody on the network!
    #disable auth
    #broadcastclient
    
    #Changes recquired to use pps synchonisation as explained in documentation:
    #http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918
    
    server time.cloudflare.com prefer    # Meinberg GPS167 with PPS
    #fudge 127.127.8.1 time1 0.0042        # relative to PPS for my hardware
    
    #server 127.127.22.1                   # ATOM(PPS)
    #fudge 127.127.22.1 flag3 1            # enable PPS API
    server 127.127.1.0   #local clock，和本地系统时间同步
    fudge  127.127.1.0  stratum  10   #127.127.1.0为第10层。ntp和127.127.1.0同步完后，就变成了11层。ntp是层次阶级的。同步上层服务器的stratum大小不能超过或等于16
    includefile /etc/ntp/crypto/pw
    keys /etc/ntp/keys
    disable monitor

# 3.其余节点手动同步 #

ntpdate 192.168.1.149

# 4.其余节点通过 chrony 实现同步  #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxODU0Mjkx_size_16_color_FFFFFF_t_70][]

# 5.示例 #

mount -o remount -w / #挂载Linux系统外的文件,致其可修改
    vi /etc/chrony.conf #修改配置文件
    server 192.168.1.149 iburst minpoll 2 prefer
    makestep 1.0 -1
    sync # sync 指令会将存于 buffer 中的资料强制写入硬盘中。
    ps -ef | grep chronyd
    kill 4999
    chronyd -d &
    chronyc sources

# 6.常见问题 #

*  ntp未自启动 
 *  关闭 chronyd ; 关闭 Ubuntu 系统设置里面的时钟获取

# 7.参考文献 #

设置局域网NTP对时:[https://blog.csdn.net/s\_p\_j/article/details/88386981][https_blog.csdn.net_s_p_j_article_details_88386981]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxODU0Mjkx_size_16_color_FFFFFF_t_70]: /images/20221124/a78b105079ff41cc9fa568e3f68d7fb5.png
[https_blog.csdn.net_s_p_j_article_details_88386981]: https://blog.csdn.net/s_p_j/article/details/88386981