Timezone

Overview

Timezone에 대한 기술 문서입니다.

Summary

• 무엇인가? - Timezone
• 왜 필요한가? - HPC 및 서버 환경에서 필수 개념
• 언제 사용하는가? - 서버 구성, 성능 튜닝, 문제 해결 시

Purpose

이 문서가 존재하는 이유

• Goal: Timezone에 대한 기술 정보 제공
• Scope: Timezone의 개념, 사용법, 설정
• Non-goals: 다른 주제로의 확장

Key Concepts

Concept	Description	Related
Timezone	HPC/서버 환경에서 중요한 기술 개념	Linux, Server

Detailed Explanation

Timezone tells your system where you are in the world depending on your exact location on this planet with GMT-/+<time> format. On most Linux, /etc/timezone is a text-based representation of what timezone you are in. /etc/localtime is a binary representation of the exact rules for calculating the time relative to UNIX time by a symbolic link from /etc/localtime to a file in the /usr/share/zoneinfo directory.

instead of manually chaing those file, timedatectl command change your timezone much easily.

# Get available timezone list and it's name 
$ timedatectl list-timezones  | grep -i seoul
Asia/Seoul
# Set system timezone to Asia/Seoul, for example.
$ sudo timedatectl set-timezone Asia/Seoul
$ ls -al /etc/timezone
-rw-r--r-- 1 root root 11 May 30 10:51 /etc/timezone
$ cat /etc/timezone
Asia/Seoul
$ ls -al /etc/localtime
lrwxrwxrwx 1 root root 32 May 30 10:51 /etc/localtime -> ../usr/share/zoneinfo/Asia/Seoul

systemd uses /etc/systemd/timesyncd.conf file for NTP time sync. FallbackNTP points to the NTP servers, for example, FallbackNTP=time.nist.gov <syntaxhighlight lang="bash">

1. changing configuration file needs to restart systemd-timesyncd service

Best Practices

• 최신 버전 사용 권장
• 공식 문서 참고
• 테스트 환경에서 먼저 검증

References

• Timezone

Related Pages

• Linux
• Server
• Hardware
• Network

Knowledge Graph

Related

→ Linux → Server → Hardware → Network