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
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Purpose
이 문서가 존재하는 이유
- Goal: Timezone에 대한 기술 정보 제공
- Scope: Timezone의 개념, 사용법, 설정
- Non-goals: 다른 주제로의 확장
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Key Concepts
| Concept | Description | Related |
|---|---|---|
| Timezone | HPC/서버 환경에서 중요한 기술 개념 | Linux, Server |
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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">
- changing configuration file needs to restart systemd-timesyncd service
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Best Practices
- 최신 버전 사용 권장
- 공식 문서 참고
- 테스트 환경에서 먼저 검증
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References
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Related Pages
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Knowledge Graph
Related