最終更新:2024-06-20 (木) 00:22:06 (25d)  

Linux/etc/ntp.conf
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ntpdの設定ファイル

https://www.ntp.org/documentation/4.2.8-series/ntp.conf/

Ubuntu 22.04

  • # /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
    
    
    # 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