{"id":283,"date":"2007-09-16T02:46:20","date_gmt":"2007-09-15T23:46:20","guid":{"rendered":"http:\/\/www.void.gr\/kargig\/blog\/?p=283"},"modified":"2007-09-16T02:55:08","modified_gmt":"2007-09-15T23:55:08","slug":"force-remote-reboot-via-sysrq","status":"publish","type":"post","link":"https:\/\/www.void.gr\/kargig\/blog\/2007\/09\/16\/force-remote-reboot-via-sysrq\/","title":{"rendered":"Force remote reboot via sysrq"},"content":{"rendered":"<p>I&#8217;ve just had a kernel crash on a remote machine. Unfortunately kjournald died and I couldn&#8217;t write anything to the \/ (root) partition. I could ssh to the machine but I couldn&#8217;t start nor stop any services. I couldn&#8217;t call any shutdown scripts either. My only hope was to force, somehow, the machine to hard reboot remotely, but how ? The solution was to use the <a href=\"http:\/\/en.wikipedia.org\/wiki\/Magic_SysRq_key\">magic sysrq<\/a> button (or trigger if you like)!<\/p>\n<p>Since my kernel already supported sysrq and it was enabled,  I only had to:<br \/>\n<code>echo b &gt; \/proc\/sysrq-trigger<\/code><br \/>\nand the machine rebooted just as if I had pressed the reset switch on the box.<\/p>\n<p>The good news is that after one minute the machine was up and running, the bad news is that I have to find what caused the kernel crash. It&#8217;s the third time it happens since January on the same machine&#8230;<\/p>\n<p>P.S. <a href=\"http:\/\/marek.terminus.sk\/prog\/ipt_sysrq.shtml\">ipt_sysrq<\/a> looks quite interesting now&#8230;hmm&#8230;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I&#8217;ve just had a kernel crash on a remote machine. Unfortunately kjournald died and I couldn&#8217;t write anything to the \/ (root) partition. I could ssh to the machine but I couldn&#8217;t start nor stop any services. I couldn&#8217;t call any shutdown scripts either. My only hope was to force, somehow, the machine to hard [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ep_exclude_from_search":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-283","post","type-post","status-publish","format-standard","hentry","category-linux"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"I&#039;ve just had a kernel crash on a remote machine. Unfortunately kjournald died and I couldn&#039;t write anything to the \/ (root) partition. I could ssh to the machine but I couldn&#039;t start nor stop any services. I couldn&#039;t call any shutdown scripts either. My only hope was to force, somehow, the machine to hard\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"kargig\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.void.gr\/kargig\/blog\/2007\/09\/16\/force-remote-reboot-via-sysrq\/\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/2007\\\/09\\\/16\\\/force-remote-reboot-via-sysrq\\\/#article\",\"name\":\"Force remote reboot via sysrq | Into.the.Void.\",\"headline\":\"Force remote reboot via sysrq\",\"author\":{\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/author\\\/site-admin\\\/#author\"},\"publisher\":{\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/#organization\"},\"datePublished\":\"2007-09-16T02:46:20+03:00\",\"dateModified\":\"2007-09-16T02:55:08+03:00\",\"inLanguage\":\"en-US\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/2007\\\/09\\\/16\\\/force-remote-reboot-via-sysrq\\\/#webpage\"},\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/2007\\\/09\\\/16\\\/force-remote-reboot-via-sysrq\\\/#webpage\"},\"articleSection\":\"Linux\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/2007\\\/09\\\/16\\\/force-remote-reboot-via-sysrq\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/category\\\/linux\\\/#listItem\",\"name\":\"Linux\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/category\\\/linux\\\/#listItem\",\"position\":2,\"name\":\"Linux\",\"item\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/category\\\/linux\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/2007\\\/09\\\/16\\\/force-remote-reboot-via-sysrq\\\/#listItem\",\"name\":\"Force remote reboot via sysrq\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/2007\\\/09\\\/16\\\/force-remote-reboot-via-sysrq\\\/#listItem\",\"position\":3,\"name\":\"Force remote reboot via sysrq\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/category\\\/linux\\\/#listItem\",\"name\":\"Linux\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/#organization\",\"name\":\"Into.the.Void.\",\"description\":\"Into The Void\",\"url\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/\",\"sameAs\":[\"https:\\\/\\\/x.com\\\/kargig\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/author\\\/site-admin\\\/#author\",\"url\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/author\\\/site-admin\\\/\",\"name\":\"kargig\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/2007\\\/09\\\/16\\\/force-remote-reboot-via-sysrq\\\/#webpage\",\"url\":\"https:\\\/\\\/www.void.gr\\\/kargig\\\/blog\\\/2007\\\/09\\\/16\\\/force-remote-reboot-via-sysrq\\\/\",\"name\":\"Force remote reboot via sysrq | Into.the.Void.\",\"description\":\"I've just had a kernel crash on a remote machine. 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