NTP 似 乎沒有在 Debian Jessie 中啟用和同步

當我在 Ubuntu 中按照以下步驟操作時，NTP 已啟用並同步。然而，在 Debian Jessie 中情況正好相反。有人知道 Debian 說“不”的原因嗎？由於“當地時間”是正確的，我還應該擔心嗎？

採取的步驟

$ timedatectl set-timezone Europe/London

$ sudo apt-get install -y ntp

$ cat /etc/ntp.conf
driftfile /var/lib/ntp/ntp.drift
server 0.uk.pool.ntp.org iburst
server 1.uk.pool.ntp.org iburst
server 2.uk.pool.ntp.org iburst
server 3.uk.pool.ntp.org iburst
restrict 127.0.0.1
restrict ::1

$ service ntp stop
$ ntpd -gq
$ service ntp start

$ systemctl enable ntp
$ systemctl restart ntp

Debian 狀態

$ timedatectl
     Local time: Sun 2018-05-27 08:57:32 BST
 Universal time: Sun 2018-05-27 07:57:32 UTC
       RTC time: Sun 2018-05-27 07:57:30
      Time zone: Europe/London (BST, +0100)
    NTP enabled: no
NTP synchronized: no
RTC in local TZ: no
     DST active: yes
Last DST change: DST began at
                 Sun 2018-03-25 00:59:59 GMT
                 Sun 2018-03-25 02:00:00 BST
Next DST change: DST ends (the clock jumps one hour backwards) at
                 Sun 2018-10-28 01:59:59 BST
                 Sun 2018-10-28 01:00:00 GMT


$ ntpq -p
    remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+h88-150-240-202 217.114.59.66    3 u   36   64    1   10.349   -1.919   0.882
*ntp3.wirehive.n 195.66.241.2     2 u   33   64    3   13.717   -0.094   1.398
+ns1.do.steersne 195.66.241.3     2 u   32   64    3    9.994   -1.230   0.947

Ubuntu 狀態

$ timedatectl
     Local time: Sun 2018-03-14 10:51:48 GMT
 Universal time: Sun 2018-03-14 10:51:48 UTC
       RTC time: Sun 2018-03-14 10:51:46
      Time zone: Europe/London (GMT, +0000)
Network time on: yes
NTP synchronized: yes
RTC in local TZ: no

要啟用時間同步，timedatectl請使用以下命令。

timedatectl set-ntp true

這將啟用該systemd服務systemd-timesyncd.service。從man timedatectl.

set-ntp [BOOL]
    Takes a boolean argument. Controls whether network time synchronization is active and enabled (if
    available). This enables and starts, or disables and stops the systemd-timesyncd.service unit. It does not
    affect the state of any other, unrelated network time synchronization services that might be installed on
    the system. This command is hence mostly equivalent to: systemctl enable --now systemd-timesyncd.service
    and systemctl disable --now systemd-timesyncd.service, but is protected by a different access policy.

    Note that even if time synchronization is turned off with this command, another unrelated system service
    might still synchronize the clock with the network. Also note that, strictly speaking,
    systemd-timesyncd.service does more than just network time synchronization, as it ensures a monotonic
    clock on systems without RTC even if no network is available. See systemd-timesyncd.service(8) for details
    about this.

因此，例如ntp或chrony已經在執行但timedatectl可能沒有意識到這一點是可能的。

此外，您可能必須配置您的 NTP 伺服器，/etc/systemd/timesyncd.conf除非您通過 DHCP 獲取您的 NTP 伺服器，或者它們也可能在相應的配置中進行systemd-networkd.service配置。有關詳細資訊，請參閱man systemd-timesyncd.service。

引用自：https://serverfault.com/questions/913968