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時をかけるほと / Leap Second
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Yuki Ishikawa
June 18, 2015
Technology
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時をかけるほと / Leap Second
Yuki Ishikawa
June 18, 2015
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Transcript
࣌ Λ ͔ ͚ Δ ΄ ͱ
Θ ͨ ͠ Ͱ ͢
12 ճ ؍ ͨ
ࠓλΠϜϦʔϓ͢Δ ํ๏Λ͝հ͠·͢
ࠓ͢͜ͱ • ͏Δ͏ඵʹ͍ͭͯ • ͏Δ͏ඵΛײ͡Δํ๏ • λΠϜϦʔϓ͢Δํ๏
ࠓ͞ͳ͍͜ͱ • ͏Δ͏ඵʹΑΔোͷରࡦ
͏Δ͏ඵʹ͍ͭͯ
͏Δ͏ඵͱ • ੈքඪ४࣌(UTC) ͱ ੈք࣌(UT1) ͷࠩΛຒΊΔͷ • 1ඵ૿͑ͨΓݮͬͨΓ͢Δ • ࠓͷͱ͜Ζݮͬͨ͜ͱͳ͍
• 1972ʙ2012ͷؒʹܭ25ճ࣮ࢪ • ࣮ࢪͷ 6݄30 ·ͨ 12݄31 • 23࣌5960ඵ ͕Ճ͞ΕΔ • ຊ࣌ؒͩͱ࣍ͷͷ 8࣌5960ඵ
࣍ճͷ͏Δ͏ඵ • 20156݄30 23࣌5960ඵ • ຊ࣌ؒͩͱ 7݄1 23࣌5960ඵ • 2012Ҏདྷɺ̏ͿΓ
͏Δ͏ඵͱ IT • 2012࣮ࢪ࣌ʹଟ͘ͷ Linux αʔόͰ ো͕ൃੜ • ରࡦํ๏Χʔωϧͱ͔ ntpd
ͱ͔ͷ όʔδϣϯʹΑͬͯ৭ʑͳͷͰׂѪ • άάΕ (^ω^)
େखΫϥυϕϯμʔͷରԠ AWS: લޙ12࣌ؒͣͭ ܭ24͔͚࣌ؒͯௐ GCP: લޙ10࣌ؒͣͭ ܭ20͔͚࣌ؒͯௐ
AWS, GCP ʮ͏Δ͏ඵͳΜͯͳ͔ͬͨʯ ( ŋ´Ŗŋʆ)ŪƄź
͏Δ͏ඵΛײ͡Δํ๏
NTP ύέοτ
Leap Indicator • ͏Δ͏ඵ͕͍ۙ͜ͱΛΒͤΔϑϥά • ݖҖαʔόʹ LI Ϗοτ͕ઃఆ͞ΕΔͱ ঃʑʹԼҐ NTP
αʔόʹਁಁ͍ͯ͘͠ • LI ϏοτΛड͚औͬͨͱ͖Ͳ͏ରԠ͢Δ͔ ֤ NTP αʔόʹΑͬͯҟͳΔ
LI Ϗοτͷछྨ 00: ͏Δ͏ඵͳ͠ʢ௨ৗ࣌ʣ 01: ͏Δ͏ඵ͋Γʢ̍ඵ૿͢ʣ 10: ͏Δ͏ඵ͋Γʢ̍ඵݮΒ͢ʣ
LI ϏοτΛ͍ͯΈΔ $ ntpq -c rv
λΠϜϦʔϓ͢Δํ๏
લఏࣝ • ntpd Ͱ 23࣌5960ඵ ૠೖ͞Εͳ͍ • 23࣌5959ඵ ͕̎ඵ͋Δ •
ʮ60ඵʯΛѻ͑ͳ͍γεςϜ͋ΔͨΊ • ʢͱࢥΘΕΔʣ
ϛϦඵͲ͏ͳΔͷʁ ̎ճͷ 23࣌5959ඵ ʹͳͬͨΒ ϛϦඵϦηοτ͞Ε·͢
ϛϦඵͲ͏ͳΔͷʁ 23:59:59.000000 : 23:59:59.999999 23:59:59.000000 : 23:59:59.999999 00:00:00.000000 ௨ৗͷ 23࣌5959ඵ
̎ճͷ 23࣌5959ඵ ʢ͏Δ͏ඵʣ
ͭ·Γ΅ͨͪ͘ɺ ͏Δ͏ඵʹΑͬͯ ̍ඵؒͷ࣌ؒḪߦ͕ Ͱ͖Δɾɾɾͬʂʂʂ
ͬ͜ɺ͜Εɾɾɾͬʂ (;ŋ`дŋ´)
None
͍͚ͬ͑͑͑ ͑͑͑͑͑͑
None