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class="fa fa-info" aria-hidden="true"></i>  </h4> </div> <div class="hfibuttontitle"> 螣未畏纬委蔚蟼 </div> </a></div> </div> </div> </div> </div> <div id="servicepagelink" class="top-link pull-right"> <div class="form-group"><div class="view view-service-page-top-link view-id-service_page_top_link view-display-id-block_1 view-dom-id-c95c3dda622690664efcc8eab212fc70cc2cb2c1d70b302026825c6a7fbe77b9"> </div> </div> </div> </div> </div> <div class="spacer"></div> <a id="main-content"></a> <div class="region region-content"> <article data-history-node-id="90" role="article" about="/el/service/ntp" class="service-page full clearfix"> <div class="content"> <div class="field field--name-body field--type-text-with-summary field--label-hidden field--item"><p>螣蟽蠀纬蠂蟻慰谓喂蟽渭蠈蟼蟿蠅谓蟻慰位慰纬喂蠋谓渭蔚蟿伪尉蠉未喂伪蠁蠈蟻蠅谓未喂魏蟿蠀伪魏蠋谓蟽蠀蟽魏蔚蠀蠋谓蟺伪蟻苇蠂蔚喂未喂维蠁慰蟻伪未喂伪蠂蔚喂蟻喂蟽蟿喂魏维慰蠁苇位畏韦伪蟽畏渭伪谓蟿喂魏蠈蟿蔚蟻伪伪蟺蠈伪蠀蟿维蔚委谓伪喂畏未蠀谓伪蟿蠈蟿畏蟿伪蠂蟻慰谓喂魏萎蟼蟽蠀蟽蠂苇蟿喂蟽畏蟼蟿蠅谓纬蔚纬慰谓蠈蟿蠅谓蟺慰蠀魏伪蟿伪纬蟻维蠁慰谓蟿伪喂伪蟺蠈未喂伪蠁慰蟻蔚蟿喂魏苇蟼未喂魏蟿蠀伪魏苇蟼蟽蠀蟽魏蔚蠀苇蟼 (log files, syslog, snmp traps) 魏伪喂畏聽伪蠀蟿蠈渭伪蟿畏蟻蠉胃渭喂蟽畏蟿慰蠀蟻慰位慰纬喂慰蠉蟿蔚蟻渭伪蟿喂魏蠋谓蟽蠀蟽魏蔚蠀蠋谓渭蔚魏蔚谓蟿蟻喂魏蠈蟻慰位蠈喂, 蟿慰慰蟺慰委慰蟽蠀谓萎胃蠅蟼蔚委谓伪喂蟽蠀纬蠂蟻慰谓喂蟽渭苇谓慰蟽蟿畏谓蟿慰蟺喂魏萎蠋蟻伪.</p> <p>螚蟻蠉胃渭喂蟽畏蟿慰蠀蠂蟻慰谓喂蟽渭慰蠉蟽蟿喂蟼蟽蠀蟽魏蔚蠀苇蟼蟿慰蠀未喂魏蟿蠉慰蠀纬委谓蔚蟿伪喂渭蔚蠂蟻萎蟽畏蟿慰蠀蟺蟻蠅蟿慰魏蠈位位慰蠀 NTP (network Time Protocol). 韦慰螝螘螖螘螠螤蟺蟻慰蟽蠁苇蟻蔚喂蟿畏谓蠀蟺畏蟻蔚蟽委伪螡韦巍纬喂伪蟿慰谓蟽蠀纬蠂蟻慰谓喂蟽渭蠈蟿蠅谓蟻慰位慰纬喂蠋谓蟿蠅谓未喂魏蟿蠀伪魏蠋谓蟽蠀蟽魏蔚蠀蠋谓蟿畏蟼蟺慰位蠀蟿蔚蠂谓蔚喂伪魏萎蟼魏慰喂谓蠈蟿畏蟿伪蟼渭蔚蟿慰蟻慰位蠈喂伪谓伪蠁慰蟻维蟼蟿畏蟼蠀蟺畏蟻蔚蟽委伪蟼 NTP 蟿慰蠀螘螠螤. 螚蠀蟺畏蟻蔚蟽委伪 NTP (畏慰蟺慰委伪蟺伪蟻苇蠂蔚蟿伪喂伪蟺蠈蟺蔚蟻喂蟽蟽蠈蟿蔚蟻慰蠀蟼伪蟺蠈苇谓伪蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼蟽蠀纬蠂蟻慰谓喂蟽渭苇谓慰蠀蟼渭蔚蟿伪尉蠉蟿慰蠀蟼) 蟽蠀纬蠂蟻慰谓委味蔚蟿伪喂伪谓伪未蟻慰渭喂魏维蟽蔚蔚胃谓喂魏蠈蟺蟻蠈蟿蠀蟺慰蠂蟻蠈谓慰蠀 UTC (Universal Time Coordinate) / GMT (Greenwich Mean Time), 伪蟺蠈蟿慰慰蟺慰委慰蟺蟻慰魏蠉蟺蟿慰蠀谓魏伪喂蟿伪 EET (European Eastern Time), EEST (European Eastern Summer Time), 蟿伪慰蟺慰委伪蔚委谓伪喂蟿伪蔚胃谓喂魏维蟺蟻蠈蟿蠀蟺伪蠂蟻蠈谓慰蠀蟿伪慰蟺慰委伪蠂蟻畏蟽喂渭慰蟺慰喂慰蠉谓蟿伪喂蟽蟿畏谓螘位位维未伪.</p> <p>聽</p> <h4>韦委聽蔚委谓伪喂蟿慰 NTP</h4> <p>韦慰 <strong>螤蟻蠅蟿蠈魏慰位位慰螖喂魏蟿蠀伪魏慰蠉围蟻蠈谓慰蠀 (Network Time Protocol - NTP)</strong> 蔚委谓伪喂苇谓伪蟺蟻蠅蟿蠈魏慰位位慰蟿慰慰蟺慰委慰蠂蟻畏蟽喂渭慰蟺慰喂蔚委蟿伪喂纬喂伪谓伪蟿慰谓蟽蠀纬蠂蟻慰谓喂蟽渭蠈蟿畏蟼蠋蟻伪蟼蔚谓蠈蟼蠀蟺慰位慰纬喂蟽蟿萎, 蔚尉蠀蟺畏蟻蔚蟿畏蟿萎, 未蟻慰渭慰位慰纬畏蟿萎萎纬蔚谓喂魏蠈蟿蔚蟻伪渭委伪蟼未喂魏蟿蠀伪魏萎蟼蟽蠀蟽魏蔚蠀萎蟼渭蔚渭委伪蟺畏纬萎蠋蟻伪蟼蟺慰蠀位蔚喂蟿慰蠀蟻纬蔚委蠅蟼蟽畏渭蔚委慰伪谓伪蠁慰蟻维蟼. 螠苇蟽蠅蟿慰蠀 NTP 蔚蟺喂蟿蠀纬蠂维谓蔚蟿伪喂蟽蠀纬蠂蟻慰谓喂蟽渭蠈蟼慰谓慰渭伪蟽蟿喂魏萎蟼伪魏蟻委尾蔚喂伪蟼蟿畏蟼蟿维尉畏蟼蟿慰蠀蠂喂位喂慰蟽蟿慰蠉蟿慰蠀未蔚蠀蟿蔚蟻慰位苇蟺蟿慰蠀蟽蔚蟿慰蟺喂魏维未委魏蟿蠀伪 (LAN) 蠈蟺蠅蟼伪蠀蟿蠈蟿畏蟼蟺慰位蠀蟿蔚蠂谓蔚喂慰蠉蟺慰位畏蟼蟿慰蠀螘螠螤, 魏伪喂蟿畏蟼蟿维尉畏蟼蟿慰蠀蠂喂位喂慰蟽蟿慰蠉蟿慰蠀未蔚蠀蟿蔚蟻慰位苇蟺蟿慰蠀纬喂伪未委魏蟿蠀伪渭蔚纬维位畏蟼蔚渭尾苇位蔚喂伪蟼 (WAN). 螠委伪蟿蠀蟺喂魏萎 NTP 未喂伪渭蠈蟻蠁蠅蟽畏蠂蟻畏蟽喂渭慰蟺慰喂蔚委蟺慰位位伪蟺位慰蠉蟼蔚蠁蔚未蟻喂魏慰蠉蟼蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼魏伪喂未喂维蠁慰蟻蔚蟼未喂伪未蟻慰渭苇蟼未喂魏蟿蠉慰蠀, 渭蔚蟽魏慰蟺蠈谓伪蟺蔚蟿蠉蠂蔚喂蠀蠄畏位萎伪魏蟻委尾蔚喂伪魏伪喂伪尉喂慰蟺喂蟽蟿委伪. 螠蔚蟻喂魏苇蟼蟺伪蟻伪渭蔚蟿蟻慰蟺慰喂萎蟽蔚喂蟼蟺蔚蟻喂苇蠂慰蠀谓蟿伪蠀蟿慰蟺慰委畏蟽畏渭蔚魏蟻蠀蟺蟿慰纬蟻伪蠁委伪纬喂伪伪蟺慰蠁蠀纬萎伪蟿蠀蠂畏渭维蟿蠅谓萎渭慰蠂胃畏蟻蠋谓蔚蟺喂胃苇蟽蔚蠅谓.</p> <p>螆谓伪蟼 NTP 蔚尉蠀蟺畏蟻蔚蟿畏蟿萎蟼蟽蠀纬蠂蟻慰谓委味蔚喂蟿伪蟻慰位蠈纬喂伪蟿蠅谓蟽蠀蟽魏蔚蠀蠋谓蟺慰蠀蟽蠀谓未苇慰谓蟿伪喂蟽蔚伪蠀蟿蠈谓渭苇蟽蠅蟿慰蠀蟺蟻蠅蟿慰魏蠈位位慰蠀 NTP. 螠蔚蟿慰谓蟿蟻蠈蟺慰伪蠀蟿蠈慰喂未喂魏蟿蠀伪魏苇蟼伪蠀蟿苇蟼蟽蠀蟽魏蔚蠀苇蟼苇蠂慰蠀谓魏慰喂谓蠈蠂蟻慰谓喂魏蠈蟽畏渭蔚委慰伪谓伪蠁慰蟻维蟼. 螌渭蠅蟼蟽蔚蟺慰位位苇蟼蟺蔚蟻喂蟺蟿蠋蟽蔚喂蟼魏伪喂蟿慰蟻慰位蠈喂蟿慰蠀蔚尉蠀蟺畏蟻蔚蟿畏蟿萎蟿慰蠀委未喂慰蠀蟽蠀纬蠂蟻慰谓委味蔚蟿伪喂渭蔚维位位慰蟻慰位蠈喂伪谓伪蠁慰蟻维蟼. 危蠀谓萎胃蠅蟼, 慰喂 NTP 蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼蟽蠀纬蠂蟻慰谓委味慰谓蟿伪喂蟿蔚位喂魏维伪谓伪未蟻慰渭喂魏维渭蔚蟿慰 UTC (Universal Time Coordinate). 螒蠀蟿蠈蔚蟺喂蟿蠀纬蠂维谓蔚蟿伪喂蠅蟼蔚尉萎蟼:</p> <ul> <li>螒蟿慰渭喂魏维蟻慰位蠈纬喂伪未委谓慰蠀谓蟺位畏蟻慰蠁慰蟻委伪蠂蟻蠈谓慰蠀伪蟺蠈蠁蠀蟽喂魏苇蟼蟺畏纬苇蟼蠂蟻蠈谓慰蠀 (蟺.蠂螝伪喂蟽委慰蠀). 螒蠀蟿维蟿伪蟻慰位蠈纬喂伪胃蔚蠅蟻慰蠉谓蟿伪喂 <strong>Stratum 0</strong>.</li> <li>螝蠉蟻喂慰喂蟺蟻蠅蟿蔚蠉慰谓蟿蔚蟼 (<strong>Primary Stratum 1</strong>) 蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼蟽蠀纬蠂蟻慰谓委味慰蠀谓蟽蔚蔚胃谓喂魏维蟺蟻蠈蟿蠀蟺伪蠂蟻蠈谓慰蠀 (UTC, EET 魏位蟺) 渭蔚 Stratum 0 蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼渭蔚蠂蟻萎蟽畏蟻伪未喂慰蠁蠅谓喂魏蠋谓魏蠀渭维蟿蠅谓, 未慰蟻蠀蠁蠈蟻蠅谓聽魏伪喂伪蟿慰渭喂魏蠋谓蟻慰位慰纬喂蠋谓.</li> <li>NTP 蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼位伪渭尾维谓慰蠀谓蠋蟻伪伪蟺蠈维位位慰蠀蟼 NTP 蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼, 未畏渭喂慰蠀蟻纬蠈谓蟿伪蟼苇蟿蟽喂苇谓伪喂蔚蟻伪蟻蠂喂魏蠈渭慰谓蟿苇位慰蟺伪蟻慰蠂萎蟼蠂蟻慰谓喂蟽渭慰蠉. 螣喂蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼伪蠀蟿慰委慰谓慰渭维味慰谓蟿伪喂 <strong>stratum 2</strong>, <strong>stratum 3</strong> 魏位蟺伪谓维位慰纬伪渭蔚蟿畏谓伪蟺蠈蟽蟿伪蟽萎蟿慰蠀蟼伪蟺蠈蟿慰蠀蟼 stratum 1 蔚尉蠀蟺畏蟻蔚蟿畏蟿苇蟼.</li> </ul> <p>螚伪尉喂慰蟺喂蟽蟿委伪蟿畏蟼位蔚喂蟿慰蠀蟻纬委伪蟼蟺伪蟻苇蠂蔚蟿伪喂伪蟺蠈蟿畏谓蠉蟺伪蟻尉畏蟿慰蠀喂蔚蟻伪蟻蠂喂魏慰蠉蟽蠂萎渭伪蟿慰蟼, 蟿畏谓蟺喂胃伪谓萎蠉蟺伪蟻尉畏蔚谓伪位位伪魏蟿喂魏蠋谓蟺畏纬蠋谓蠂蟻慰谓喂蟽渭慰蠉魏伪喂蟿畏谓蠉蟺伪蟻尉畏蟺慰位位伪蟺位蠋谓未喂伪未蟻慰渭蠋谓蟺蟻慰蟼伪蠀蟿苇蟼.</p> <p>聽螤蔚蟻喂蟽蟽蠈蟿蔚蟻蔚蟼蟺位畏蟻慰蠁慰蟻委蔚蟼纬喂伪蟿慰 NTP 渭蟺慰蟻蔚委蟿蔚谓伪尾蟻蔚委蟿蔚 <a href="http://www.ntp.org/">蔚未蠋</a>.</p> <p>聽</p> <h4>H NTP 蠀蟺畏蟻蔚蟽委伪蟿慰蠀螘螠螤</h4> <p>聽韦慰螝螘螖螘螠螤蟺伪蟻苇蠂蔚喂蟽蠀纬蠂蟻慰谓喂蟽渭蠈蟽蔚 <strong>UTC</strong> 蟽蟿畏谓蟺慰位蠀蟿蔚蠂谓蔚喂伪魏萎魏慰喂谓蠈蟿畏蟿伪蟿慰蠀螘螠螤渭苇蟽蠅蟿畏蟼蠀蟺畏蟻蔚蟽委伪蟼 NTP. 螚蠀蟺畏蟻蔚蟽委伪蔚委谓伪喂 <strong>stratum-2</strong> 魏伪喂蟺伪蟻苇蠂蔚蟿伪喂伪蟺蠈蟿慰谓蔚尉蠀蟺畏蟻蔚蟿畏蟿萎 <strong>ntp.</strong><strong>ntua.</strong><strong>gr</strong>. 螣蟽蠀纬蠂蟻慰谓喂蟽渭蠈蟼渭蔚 UTC 纬委谓蔚蟿伪喂渭苇蟽蠅蟿畏蟼伪谓蟿委蟽蟿慰喂蠂畏蟼 stratum-2 蠀蟺畏蟻蔚蟽委伪蟼蟿慰蠀螘螖螘韦 (蔚尉蠀蟺畏蟻蔚蟿畏蟿萎蟼 ntp.grnet.gr).</p> <p>螕喂伪蔚蟻蠅蟿萎蟽蔚喂蟼萎蟺蟻慰尾位萎渭伪蟿伪蟽蠂蔚蟿喂魏维渭蔚蟿畏谓蠀蟺畏蟻蔚蟽委伪 NTP, 蔚蟺喂魏慰喂谓蠅谓萎蟽蟿蔚渭伪味委渭伪蟼渭苇蟽蠅蟿慰蠀畏位蔚魏蟿蟻慰谓喂魏慰蠉蟿伪蠂蠀未蟻慰渭蔚委慰蠀: <a href="mailto:help-data@noc.ntua.gr">help-data@noc.ntua.gr.</a></p></div> </div> </article> </div> <div class="row spacer"> </div> </section> <aside class="hidden-xs col-md-2" role="complementary"> </aside> </div> <div class="row spacer"> </div> </div> <div class="nocwell" style="margin:0;"> <footer class="container-fluid" role="contentinfo"> <div class="region region-footer"> <section class="views-element-container block block-views block-views-blockfooter-services2-block-1 clearfix" id="block-views-block-footer-services2-block-1"> <div class="form-group"><div class="view 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