Time Zone and NTP - mata-elang-stable/MataElang-Platform GitHub Wiki

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Time is of great importance.

Contents

OPTIONAL: if your network is not connected to the Internet

Time Synchronization

If your servers can refer to an NTP server on the Internet, only "Setup NTP client" is required on all servers.

If your servers are put on a closed network, where the Internet is not available, you need to "Build a local NTP server" on your network. After that, "Setup NTP client" is required on all servers.

As for the time zone, this document assumes that you use "Asia/Jakarta" time zone. However, if you manage multiple sensors over different time zones, it is better to set the time zone to "UTC".

ntp

Example Environment

Item Internet Available Network Closed Network
Time Zone Asia/Jakarta Asia/Jakarta
Local NTP Server - Necessary
NTP Server 0.id.pool.ntp.org 172.16.2.110
Network Address - 172.16.2.0/24

Setup NTP Client

1. Change system clock settings.

▶️ Set the system time zone to your time zone.

  • To see a list of time zones, use timedatectl list-timezones command.
sudo timedatectl set-timezone Asia/Jakarta

▶️ RTC (Real Time Clock) is set to UTC.

sudo timedatectl set-local-rtc false

2. Configure NTP client.

▶️ Enable NTP client for time synchronization.

sudo timedatectl set-ntp true

▶️ Edit timesyncd.conf to specify NTP servers you use.

sudo nano /etc/systemd/timesyncd.conf
Configuration

🔑 If the network is closed, specify the local NTP server here.

#NTP=
NTP=0.id.pool.ntp.org

▶️ Restart the time synchronization service.

sudo systemctl restart systemd-timesyncd

✅ Confirm the time synchronization service is active.

systemctl status systemd-timesyncd
Click here to see the result. 

● systemd-timesyncd.service - Network Time Synchronization
     Loaded: loaded (/lib/systemd/system/systemd-timesyncd.service; enabled; vendor preset: enabled)
     Active: active (running) since Mon 2021-08-23 20:14:02 WIB; 25min ago

3. Check time and date.

✅ Check time and date settings.

timedatectl
Result 

               Local time: Mon 2021-08-23 20:14:02 WIB
           Universal time: Mon 2021-08-23 13:14:02 UTC
                 RTC time: Mon 2021-08-23 13:14:02
                Time zone: Asia/Jakarta (WIB, +0700)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

Build a local NTP Server

0. Introduction

❗ This is an optional installation.

If the Internet is not available on your network, it is necessary to build a local NTP server on Defence Center.

In this case, please follow the steps below. If not, skip here and go to the next installation.

1. Change system clock settings

▶️ Set the system time zone to your time zone.

  • To see a list of time zones, use timedatectl list-timezones command.
sudo timedatectl set-timezone Asia/Jakarta

▶️ RTC (Real Time Clock) is set to UTC.

sudo timedatectl set-local-rtc false

2. Check time and date.

✅ Check time and date settings.

timedatectl
Result 

               Local time: Mon 2021-08-23 20:14:02 WIB
           Universal time: Mon 2021-08-23 13:14:02 UTC
                 RTC time: Mon 2021-08-23 13:14:02
                Time zone: Asia/Jakarta (WIB, +0700)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

3. Install NTP server.

▶️ Install an NTP server.

sudo apt update && sudo apt -y upgrade
sudo apt -y install ntp

4. Configure NTP server.

▶️ Edit ntp.conf for a closed network.

sudo nano /etc/ntp.conf
Configuration

🔑 Set the network address for the Defence Center network to YOUR_NETWORK_ADDRESS and YOUR_NETMASK.

### Line 21-24: Comment out the default NTP servers.
#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

### Line 27: Comment out Ubuntu's NTP server.
#pool ntp.ubuntu.com

### Line 51: Add a restriction of time synchronization.
restrict <YOUR_NETWORK_ADDRESS (e.g. 172.16.2.0)> mask <YOUR_NETMASK (e.g. 255.255.255.0)> notrap nomodify

### Line 61-62: Add the local clock settings at the end of the file.
server  127.127.1.0 prefer
fudge   127.127.1.0 stratum 10

5. Restart NTP service.

▶️ Restart the NTP service.

sudo systemctl restart ntp

✅ Confirm the NTP service is active.

systemctl status ntp
Click here to see the result. 

● ntp.service - Network Time Service
     Loaded: loaded (/lib/systemd/system/ntp.service; enabled; vendor preset: enabled)
     Active: active (running) since Mon 2021-08-23 20:14:02 WIB; 25min ago

✅ Confirm the NTP server is working with its own clock.

ntpq -p
Result 

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*LOCAL(0)        .LOCL.          10 l   19   64    1    0.000    0.000   0.000

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