{"id":5954,"date":"2015-10-22T12:41:42","date_gmt":"2015-10-22T10:41:42","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/linux-magic-system-request-key-hacks\/"},"modified":"2015-10-22T12:41:42","modified_gmt":"2015-10-22T10:41:42","slug":"linux-magic-system-request-key-hacks","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/linux-magic-system-request-key-hacks\/","title":{"rendered":"Linux Magic System Request Key Hacks"},"content":{"rendered":"<p>Recently at a customer we needed to power-cycle a database system because we wanted to be sure that a cluster resource fails over to a remaining node as expected. The issue was that we did not have access to the data center where the system is running nor did we have access to the console. What to do? Actually it is quite easy to force a system to reboot without syncing the disks or unmounting the file systems (which is almost the same as to power-cycle the system).<\/p>\n<p>All you need to do is this (as root, of course):<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\necho b &gt; \/proc\/sysrq-trigger\n<\/pre>\n<p>&#8230; and your system is immediately gone \ud83d\ude42<\/p>\n<p>There are several other keys you can write to the trigger file. It is documented here: <a href=\"https:\/\/www.kernel.org\/doc\/html\/latest\/admin-guide\/sysrq.html\" target=\"_blank\" rel=\"noopener noreferrer\">Linux Magic System Request Key Hacks<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recently at a customer we needed to power-cycle a database system because we wanted to be sure that a cluster resource fails over to a remaining node as expected. The issue was that we did not have access to the data center where the system is running nor did we have access to the console.&hellip;&nbsp;<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[4133],"tags":[46,74],"class_list":["post-5954","post","type-post","status-publish","format-standard","hentry","category-database","tag-linux-unix","tag-oracle-linux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Linux Magic System Request Key Hacks - dbi services | Blog<\/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.dbi-services.com\/blog\/linux-magic-system-request-key-hacks\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux Magic System Request Key Hacks\" \/>\n<meta property=\"og:description\" content=\"Recently at a customer we needed to power-cycle a database system because we wanted to be sure that a cluster resource fails over to a remaining node as expected. 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