{"id":574,"date":"2010-04-12T11:58:52","date_gmt":"2010-04-12T11:58:52","guid":{"rendered":"http:\/\/soi57.net\/blog\/?p=574"},"modified":"2010-04-12T11:58:52","modified_gmt":"2010-04-12T11:58:52","slug":"sysrq-en-linux","status":"publish","type":"post","link":"https:\/\/soi57.net\/blog\/sysrq-en-linux\/","title":{"rendered":"SysRq en Linux"},"content":{"rendered":"<p>No son muchas, pero hay veces en que piensas que el \u00faltimo recurso que te queda es darle un botonazo a ese servidor que se ha quedado colgado. No es muy buena idea, la cat\u00e1strofe puede ser bastante grande. En linux, te queda un \u00faltimo cartucho que gastar: las <strong>sysrq<\/strong> ( si es que las tienes activadas ).<\/p>\n<p>Las <strong>Sysrq <\/strong>son una c<em>ombinaci\u00f3n m\u00e1gica<\/em> de teclas que puedes presionar y que hablar\u00e1n directamente con el n\u00facleo sin importar que otras tareas est\u00e9 realizando y siempre que no est\u00e9 totalmente bloqueado. Con estas <strong>combinaciones de teclas<\/strong> puedes conseguir que el <strong>sistema se apague o reinicie<\/strong> de la manera m\u00e1s ordenada posible y cerrando los ficheros y procesos de la forma menos destructiva posible.<\/p>\n<p>Las <strong>combinaciones de teclas<\/strong> son las siguientes:<\/p>\n<ul>\n<li><strong>Alt + SysRq + R<\/strong>: Cambia al teclado de <strong>modo Raw<\/strong> o modo directo a <strong>modo XLATE<\/strong>.  Si el entorno gr\u00e1fico est\u00e1 muerto ( no es que tengamos entorno gr\u00e1fico en los servidores ) y no te responde ni al teclado ni al rat\u00f3n, con esta combinaci\u00f3n de teclas, se forzar\u00e1 al n\u00facleo a que descargue todos los controladores de teclado y podremos hacer un ctrl+alt+F1 para abrir una terminal y hacerle un kill al <strong>proceso<\/strong> que este <strong>bloqueando al sistema<\/strong>. Si esto no funciona, pulsaremos la siguiente combinaci\u00f3n:\n<\/li>\n<li><strong>Alt + SysRq + S<\/strong>:<strong> Sincroniza<\/strong> los discos duros. Como a partir de este punto, lo m\u00e1s probable es que tengamos que reiniciar el sistema sincronizamos los discos para que no haga un fsck. El siguiente comando<\/li>\n<li><strong>Alt + SysRq + E<\/strong>: Para terminar todos todos los procesos del sistema, excepto init, enviando la SIGTERM 15. Con esto se pararan de forma correcta los procesos que se est\u00e9n ejecutando y se iniciar\u00e1 una sesi\u00f3n de consola. Si no, lo siguiente es\n<\/li>\n<li><strong>Alt + SysRq + I<\/strong>: Matar (-9) todos los procesos, menos init. Fuerza el fin de estos procesos. Si surte su efecto acabaremos en una consola y si no pulsaremos:\n<\/li>\n<li><strong>Alt + SysRq + U<\/strong>: Desmonta los discos y los monta en modo s\u00f3lo lectura. Se guardan los datos de las cach\u00e9s y se deconectan del sistema, para que no fallen al reiniciar. Por \u00faltimo<\/li>\n<li><strong>Alt + SysRq + B<\/strong>: Reiniciar.<\/li>\n<\/ul>\n<p>Te puedes inventar alguna frase para recordar el orden de los pasos R + S + E + I + U + B. Podemos pensar por ejemplo que si el servidor casca estaremos Rapidamente Sin Empleo Indagando Un Basurero,&#8230; yo que s\u00e9!<\/p>\n<div style='text-align:left' class='yasr-auto-insert-visitor'><\/div>","protected":false},"excerpt":{"rendered":"<p>No son muchas, pero hay veces en que piensas que el \u00faltimo recurso que te queda es darle un botonazo a ese servidor que se ha quedado colgado. No es &hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"yasr_overall_rating":0,"yasr_post_is_review":"","yasr_auto_insert_disabled":"","yasr_review_type":"","footnotes":""},"categories":[25],"tags":[268,598,612,267],"class_list":["post-574","post","type-post","status-publish","format-standard","hentry","category-linux","tag-administracion","tag-linux","tag-sysadmin","tag-sysrq"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SysRq en Linux<\/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:\/\/soi57.net\/blog\/sysrq-en-linux\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SysRq en Linux\" \/>\n<meta property=\"og:description\" content=\"No son muchas, pero hay veces en que piensas que el \u00faltimo recurso que te queda es darle un botonazo a ese servidor que se ha quedado colgado. 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