ntpクライアントをインストールした覚えなかったけど、時刻が合ってたので調べてみたらsystemd-timesyncdが有効になってました。
$ chronyc sources
210 Number of sources = 8
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^- golem.canonical.com 2 10 377 753 +7506us[+7453us] +/- 138ms
^- chilipepper.canonical.com 2 10 377 706 -6768us[-6820us] +/- 153ms
^- alphyn.canonical.com 2 10 377 133 -45ms[ -45ms] +/- 185ms
^- pugot.canonical.com 2 10 177 287 -7940us[-7940us] +/- 147ms
^+ x.ns.gin.ntt.net 2 10 377 5 -1457us[-1457us] +/- 74ms
^* kuroa.me 2 10 377 569 -45us[ -97us] +/- 35ms
^+ x.ns.gin.ntt.net 2 10 377 1013 -3102us[-3153us] +/- 74ms
^+ time.cloudflare.com 3 10 377 28m +5823us[+5739us] +/- 80ms
$ timedatectl
Local time: Tue 2020-08-18 00:09:00 UTC
Universal time: Tue 2020-08-18 00:09:00 UTC
RTC time: Tue 2020-08-18 00:09:00
Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: yes
systemd-timesyncd.service active: yes
RTC in local TZ: no
$ timedatectl --version
systemd 237
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid
zyun@pisces:~$ timedatectl
Local time: Tue 2020-08-18 00:29:10 UTC
Universal time: Tue 2020-08-18 00:29:10 UTC
RTC time: Tue 2020-08-18 00:29:09
Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: yes
systemd-timesyncd.service active: yes
RTC in local TZ: no
zyun@pisces:~$ timedatectl --help
timedatectl [OPTIONS...] COMMAND ...
Query or change system time and date settings.
-h --help Show this help message
--version Show package version
--no-pager Do not pipe output into a pager
--no-ask-password Do not prompt for password
-H --host=[USER@]HOST Operate on remote host
-M --machine=CONTAINER Operate on local container
--adjust-system-clock Adjust system clock when changing local RTC mode
Commands:
status Show current time settings
set-time TIME Set system time
set-timezone ZONE Set system time zone
list-timezones Show known time zones
set-local-rtc BOOL Control whether RTC is in local time
set-ntp BOOL Enable or disable network time synchronization
zyun@pisces:~$
$ timedatectl
Local time: Tue 2020-08-18 09:20:35 JST
Universal time: Tue 2020-08-18 00:20:35 UTC
RTC time: Tue 2020-08-18 00:20:36
Time zone: Asia/Tokyo (JST, +0900)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
$ timedatectl --version
systemd 245 (245.4-4ubuntu3.2)
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid
ubuntu@tucana:~/ > timedatectl --help
timedatectl [OPTIONS...] COMMAND ...
Query or change system time and date settings.
Commands:
status Show current time settings
show Show properties of systemd-timedated
set-time TIME Set system time
set-timezone ZONE Set system time zone
list-timezones Show known time zones
set-local-rtc BOOL Control whether RTC is in local time
set-ntp BOOL Enable or disable network time synchronization
systemd-timesyncd Commands:
timesync-status Show status of systemd-timesyncd
show-timesync Show properties of systemd-timesyncd
Options:
-h --help Show this help message
--version Show package version
--no-pager Do not pipe output into a pager
--no-ask-password Do not prompt for password
-H --host=[USER@]HOST Operate on remote host
-M --machine=CONTAINER Operate on local container
--adjust-system-clock Adjust system clock when changing local RTC mode
--monitor Monitor status of systemd-timesyncd
-p --property=NAME Show only properties by this name
-a --all Show all properties, including empty ones
--value When showing properties, only print the value
See the timedatectl(1) man page for details.
ubuntu@tucana:~/ >