{"id":263,"date":"2008-10-10T09:00:34","date_gmt":"2008-10-10T08:00:34","guid":{"rendered":"https:\/\/news.galsys.co.uk\/?p=263"},"modified":"2011-11-02T16:53:03","modified_gmt":"2011-11-02T16:53:03","slug":"keeping-accurate-time-on-linux","status":"publish","type":"post","link":"https:\/\/www.galsys.co.uk\/news\/keeping-accurate-time-on-linux\/","title":{"rendered":"Keeping accurate time on Linux"},"content":{"rendered":"

If you want to be sure that your computer clock is accurate you can configure your system to use NTP <\/a>(Network Time Protocol), one of the oldest Internet protocols and the industry standard for time synchronisation.<\/p>\n

NTP on will synchronise your computer’s clock to a pool of time servers<\/a> around the world that are official ‘timekeepers’. It is best to choose the closest to you so response time is minimized and to use more than one in case one goes down. There are more than 1.500 servers to choose from, but some areas are better served than others. Many servers on the internet are extremely inaccurate and Internet time references should not be used as a replacement for a dedicated time server.<\/p>\n

However, for basic time synchronisation<\/a> purposes, Internet providers will suffice. The first step should be to select three servers close to you – preferably in your country, or if there aren’t enough, in your ‘zone. Go to ntp home and browse through the tree of zones and servers to select which ones are best for you. The follow these commands to configure:<\/p>\n

1. Configure \/etc\/ntp.conf
\nEdit this file with a text-editor. Replace
\nserver <example-server-name>
\nwith your servers, such as:<\/p>\n

server 0.br.pool.ntp.org
\nserver 1.br.pool.ntp.org
\nserver 2.br.pool.ntp.org<\/p>\n

2. Synchronise your clock manually
\nIf your clock is drifting too NTP might refuse to synchronise it, but it can be done manually:<\/p>\n

ntpdate 0.br.pool.ntp.org (server name that you choose)<\/p>\n

3. Make your ntp daemon executable<\/p>\n

chmod +x \/etc\/rc.d\/rc.ntpd<\/p>\n

4. Start NTP now without rebooting
\nAgain, a simple command:<\/p>\n

\/etc\/rc.d\/rc.ntpd start<\/p>\n","protected":false},"excerpt":{"rendered":"

If you want to be sure that your computer clock is accurate you can configure your system to use NTP (Network Time Protocol), one of the oldest Internet protocols and the industry standard for time synchronisation. NTP on will synchronise your computer’s clock to a pool of time servers around the world that are official…<\/p>\n

Continue reading <\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,8,12,13,14],"tags":[19,20,207,22,23,25,26,27,28,204,29,30,34,35],"class_list":["post-263","post","type-post","status-publish","format-standard","hentry","category-advanced-ntp","category-ntp-configuration","category-time-server","category-time-synchronisation","category-timing-source","tag-gps-ntp-server","tag-gps-ntp-time-server","tag-gps-time-server","tag-linux-ntp","tag-linux-time-server","tag-network-time-server","tag-ntp-clock","tag-ntp-gps-server","tag-ntp-gps-time-server","tag-ntp-server-2","tag-ntp-servers","tag-ntp-time-server","tag-windows-ntp-server","tag-windows-server-2008"],"yoast_head":"\nKeeping accurate time on Linux - Galleon Systems<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.galsys.co.uk\/news\/keeping-accurate-time-on-linux\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Keeping accurate time on Linux - Galleon Systems\" \/>\n<meta property=\"og:description\" content=\"If you want to be sure that your computer clock is accurate you can configure your system to use NTP (Network Time Protocol), one of the oldest Internet protocols and the industry standard for time synchronisation. NTP on will synchronise your computer’s clock to a pool of time servers around the world that are official…Continue reading\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.galsys.co.uk\/news\/keeping-accurate-time-on-linux\/\" \/>\n<meta property=\"og:site_name\" content=\"Galleon Systems\" \/>\n<meta property=\"article:published_time\" content=\"2008-10-10T08:00:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2011-11-02T16:53:03+00:00\" \/>\n<meta name=\"author\" content=\"Richard N Williams\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@galleonsystems\" \/>\n<meta name=\"twitter:site\" content=\"@GalleonSystems\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Richard N Williams\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/keeping-accurate-time-on-linux\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/keeping-accurate-time-on-linux\\\/\"},\"author\":{\"name\":\"Richard N Williams\",\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/#\\\/schema\\\/person\\\/38013a1dcb0021026d59957e276aa3cd\"},\"headline\":\"Keeping accurate time on Linux\",\"datePublished\":\"2008-10-10T08:00:34+00:00\",\"dateModified\":\"2011-11-02T16:53:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/keeping-accurate-time-on-linux\\\/\"},\"wordCount\":284,\"keywords\":[\"gps ntp server\",\"gps ntp time server\",\"gps time server\",\"linux ntp\",\"linux time server\",\"network time server\",\"ntp clock\",\"ntp gps server\",\"ntp gps time server\",\"ntp server\",\"ntp servers\",\"ntp time server\",\"windows ntp server\",\"windows server 2008\"],\"articleSection\":[\"advanced NTP\",\"NTP configuration\",\"time server\",\"Time Synchronisation\",\"timing source\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/keeping-accurate-time-on-linux\\\/\",\"url\":\"https:\\\/\\\/www.galsys.co.uk\\\/news\\\/keeping-accurate-time-on-linux\\\/\",\"name\":\"Keeping accurate time on Linux - 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