Leap Smear  | Public NTP  | Google for Developers
Leap Smear Stay organized with collections Save and categorize content based on your preferences. outlined_flag Google uses a "leap smear" to handle leap seconds, gradually adjusting time over 24 hours instead of abrupt clock steps. Google's recommended leap smear standard is a 24-hour linear smear from noon to noon UTC for distributed computing applications. The smear keeps frequency changes smal
Network Time Protocol Best Current Practices
Internet Engineering Task Force D. Reilly Internet-Draft Spectracom Corporation Intended status: Best Current Practice H. Stenn Expires: December 10, 2016 Network Time Foundation D. Sibold PTB June 8, 2016 Network Time Protocol Best Current Practices draft-reilly-ntp-bcp-02 Abstract NTP Version 4 (NTPv4) has been widely used since its publication as RFC 5905 [RFC5905]. This documentation is a coll
Leap Second Smearing with NTP
The NTP software protocol and its reference implementation, ntpd, were originally designed to distribute UTC time over a network as accurately as possible. Unfortunately, leap seconds are scheduled to be inserted into or deleted from the UTC time scale in irregular intervals to keep the UTC time scale synchronized with the Earth’s rotation. Deletions haven’t happened, yet, but insertions have happ
NTPã¨ã¯ï¼Ÿ NTPã®ä»•çµ„ã¿å«ã‚ã¦ãŠãŠã¾ã‹ã«è§£èª¬
NTPã¨ã¯ã€ŒNetwork Time Protocolã€ã®ç•¥ã 。 ç°¡å˜ã«è¨€ãˆã°ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ä¸Šã§æ™‚é–“ã‚’åŒæœŸã™ã‚‹ãƒ—ãƒãƒˆã‚³ãƒ«ã®ã“ã¨ã§ã‚る。コンピュータã®æ™‚é–“åˆã‚ã›ãªã©ã«ä½¿ã†ã€‚ ã“ã®ãƒšãƒ¼ã‚¸ã§ã¯NTPã®æ¦‚è¦ã¨ãã®ä»•çµ„ã¿ã«ã¤ã„ã¦è§£èª¬ã—ãŸã€‚ã“ã®ãƒšãƒ¼ã‚¸ã‚’見れã°NTPã«ã¤ã„ã¦ãŠãŠã‚ˆãã®ç†è§£ã¯ã§ããŸçŠ¶æ…‹ã«ãªã‚‹ã¯ãšã 。 NTPã«ã¤ã„㦠NTPã¯ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ä¸Šã§æ™‚é–“åŒæœŸã™ã‚‹ãƒ—ãƒãƒˆã‚³ãƒ«ã®ã“ã¨ã 。NTPã¯ã‚³ãƒ³ãƒ”ュータã®å†…部時刻をæ£ã—ãè¨å®šã™ã‚‹ãŸã‚ã«ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ä¸Šã®æ™‚刻サーãƒã«å•ã„ã‚ã‚ã›ã‚‹æ‰‹é †ã‚’定義ã—ã¦ã„る。 実装ã—ãŸã‚‚ã®ã®ä»£è¡¨ã¨ã—ã¦ã¯ã‚µãƒ¼ãƒã¨ã—ã¦ã€Œntpdã€ã‚¯ãƒ©ã‚¤ã‚¢ãƒ³ãƒˆã¨ã—ã¦ã€Œntpdateã€ãªã©ãŒã‚る。ã¨ã‚‚ã«ntpã«é–¢ã™ã‚‹ã‚ªãƒ¼ãƒ—ンソースプãƒã‚¸ã‚§ã‚¯ãƒˆã€Œhttp://www.ntp.orgã€ã§ã‚³ãƒ¼ãƒ‰ãŒé…布ã•ã‚Œã¦ã„る。 「コンピュータã®æ™‚刻ã€ã¨ã„ã†ã®ã¯PCå´ã ã‘ã§ã¿ã‚‹ã¨è»½è¦–ã•ã‚ŒãŒã¡ã 。「少ã—時間ãŒãšã‚Œã¦ã‚‹ãªãã€ãらã„
Stray Penguin - Linux Memo (ntpd)
NTP ã¯ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚’経由ã—ã¦ã‚³ãƒ³ãƒ”ュータã®æ™‚é–“ã‚’åŒæœŸã™ã‚‹ãŸã‚ã®ãƒ—ãƒãƒˆã‚³ãƒ«ã€‚通信㯠UDP プãƒãƒˆã‚³ãƒ«ã® 123 番ã©ã†ã—ã§è¡Œã†ã€‚ãã—ã¦ã€NTP サーãƒãƒ‡ãƒ¼ãƒ¢ãƒ³ã®æ¨™æº–㌠ntpd ã 。マシン自体ã®æ™‚計をåˆã‚ã›ã‚‹ã ã‘ãªã‚‰ã€ NTP パッケージã«å«ã¾ã‚Œã‚‹ ntpdate を使ã£ã¦ã‚‚ã„ã„ãŒã€ã‚ªãƒ•ã‚£ã‚·ãƒ£ãƒ«ãƒ‰ã‚ュメントã«ã‚ˆã‚‹ã¨ã€ ntpdate ã¯ã‚¨ãƒ©ãƒ¼ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°ãŒã€Œã„ã„åŠ æ¸›ã€ãªã®ã§ã€ntpd ã‚’ -q オプションã§ä½¿ã£ãŸã»ã†ãŒè‰¯ã„よã†ã 。 UNIX, Linux ã¯ã‚µãƒ¼ãƒé‹ç”¨ã‚’主眼ã¨ã—ã¦ä½œã‚‰ã‚Œã¦ã„ã‚‹ã®ã§ã€æ™‚é–“ãŒæ€¥ã«å¤‰ã‚ã£ã¦ã—ã¾ã£ã¦ã¯å•é¡ŒãŒç”Ÿã˜ã‚‹ã“ã¨ãŒå¤šã„。ãã®ãŸã‚ã€ntpd ã¯ã€ãƒžã‚·ãƒ³ã®ã‚¯ãƒãƒƒã‚¯ãŒé•ã£ã¦ã„ãŸã‹ã‚‰ã¨ã„ã£ã¦ã€ã„ããªã‚Šä½•å分もé…らã›ãŸã‚Šé€²ã‚ãŸã‚Šã¯ã—ãªã„。連続性ãŒå¤±ã‚ã‚Œãªã„よㆠ「1 秒ã®é•·ã•ã€ を実際よりも長ãã—ãŸã‚ŠçŸãã—ãŸã‚Šã™ã‚‹ã“ã¨ã«ã‚ˆã£ã¦ã€å¾ã€…ã«è£œæ£ã—ã¦ã„ã“ã†ã¨ã™ã‚‹ (一概ã«è¨€
Legacy Communities - IBM Community
If you’re looking for a developerWorks forum — Don't panic! You are in the right place. You are here because specific IBM developerWorks forums, blogs and other Connections content have been decommissioned. This page will help you find the content you are looking for, get answers to your questions, and find a new community to call home. Where am I? You are on the IBM Community area, a collection o
ã„ã¾ã™ã実践! Linuxシステム管ç†
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