Nesse artigo vou falar do serviço de sincronia de horário que está disponível no ubuntu 18 e derivados.

Iniciando.

Vamos ativar o serviço systemd-timesyncd .

systemctl enable --now systemd-timesyncd.service

root@srv01:~# systemctl enable --now systemd-timesyncd.service

Vamos definir o seu timezone

timedatectl set-timezone America/Maceio

Na dúvida .

timedatectl list-timezones

As principais nacionais são :

America/Bahia
America/Maceio
America/Manaus
America/Porto_Velho
America/Recife
America/Sao_Paulo

Vamos editar o arquivo timesyncd.conf

vi /etc/systemd/timesyncd.conf

Colocar o seguinte conteúdo.

#
 #  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.
#
# Entries in this file show the compile time defaults.
# You can change settings by editing this file.
# Defaults can be restored by simply deleting this file.
#
# See timesyncd.conf(5) for details.

[Time]
NTP=pool.ntp.br
FallbackNTP=ntp.ubuntu.com
RootDistanceMaxSec=5
PollIntervalMinSec=32
PollIntervalMaxSec=2048

Vamos ativar via timedatectl.

timedatectl set-ntp true

Reiniciar o serviço.

systemctl restart  systemd-timesyncd.service

Verificar o status .

systemctl status   systemd-timesyncd.service

julio@srv01:~$ systemctl status systemd-timesyncd.service
● systemd-timesyncd.service - Network Time Synchronization
   Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2019-11-18 10:16:50 -03; 24min ago
     Docs: man:systemd-timesyncd.service(8)
 Main PID: 2297 (systemd-timesyn)
   Status: "Synchronized to time server 200.20.186.76:123 (pool.ntp.br)."
    Tasks: 2 (limit: 2290)
   CGroup: /system.slice/systemd-timesyncd.service
           └─2297 /lib/systemd/systemd-timesyncd

Nov 18 10:16:50 srv01 systemd[1]: Starting Network Time Synchronization...
Nov 18 10:16:50 srv01 systemd[1]: Started Network Time Synchronization.
Nov 18 10:16:50 srv01 systemd-timesyncd[2297]: Synchronized to time server 200.20.186.76:123 (pool.ntp.br).

Verificar o status via timedatectl.

timedatectl status

julio@srv01:~$ timedatectl status
                      Local time: Mon 2019-11-18 10:40:22 -03
                  Universal time: Mon 2019-11-18 13:40:22 UTC
                        RTC time: Mon 2019-11-18 13:40:22
                       Time zone: America/Maceio (-03, -0300)
       System clock synchronized: yes
systemd-timesyncd.service active: yes
                 RTC in local TZ: no