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A Practical Guide to Time for Developers: Part 4 -The Linux Time Sync Cheat Sheet
개발자를 위한 시간 실용 가이드: Part 4 - Linux 시간 동기화 치트 시트
Why it matters
Linux deals with three main clock entities: system time (CLOCK_REALTIME used by most applications), RTC (battery-backed hardware clock for persistence across reboots), and PHC (PTP Hardware Clock on NICs for precise packet timing). The article serves as a practical cheat sheet for inspecting clocks, understanding synchronization relationships, and handling everyday Linux time-sync tasks using tools like date, timedatectl, hwclock, ethtool, ptp4l, and phc2sys.
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Linuxclock synchronizationRTCPHCPTPCLOCK_REALTIME