{"id":3092,"date":"2014-03-23T10:49:51","date_gmt":"2014-03-23T08:49:51","guid":{"rendered":"http:\/\/www.collet-matrat.com\/?p=3092"},"modified":"2014-03-23T10:54:56","modified_gmt":"2014-03-23T08:54:56","slug":"linux-effectuer-un-reboot-durgence-a-distance","status":"publish","type":"post","link":"https:\/\/www.collet-matrat.com\/?p=3092","title":{"rendered":"Linux \/\/ Effectuer un reboot d&rsquo;urgence \u00e0 distance"},"content":{"rendered":"<p style=\"text-align: justify;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"wp-image-3094 aligncenter\" alt=\"stop\" src=\"https:\/\/i0.wp.com\/www.collet-matrat.com\/wp-content\/uploads\/2014\/03\/stop.jpg?resize=507%2C507&#038;ssl=1\" width=\"507\" height=\"507\" srcset=\"https:\/\/i0.wp.com\/www.collet-matrat.com\/wp-content\/uploads\/2014\/03\/stop.jpg?w=667&amp;ssl=1 667w, https:\/\/i0.wp.com\/www.collet-matrat.com\/wp-content\/uploads\/2014\/03\/stop.jpg?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.collet-matrat.com\/wp-content\/uploads\/2014\/03\/stop.jpg?resize=300%2C300&amp;ssl=1 300w\" sizes=\"(max-width: 507px) 100vw, 507px\" \/>Vote serveur est h\u00e9berg\u00e9 dans un datacenter \u00e0 plusieurs centaines de kilom\u00e8tres. Vous disposez toujours d'un acc\u00e8s SSH mais la machine refuse de rebooter (<em>Init 6<\/em>, <em>reboot<\/em>, <em>halt<\/em> ... rien ne fonctionne...). Bien entendu vous ne disposez pas de module de contr\u00f4le de l'alimentation \u00e0 distance ... C'est une situation que j'ai rencontr\u00e9 il y a peu de temps suite \u00e0 un probl\u00e8me NFS sur l'un de mes serveurs.<\/p>\n<p style=\"text-align: justify;\">Si vous rencontrez ce type de probl\u00e8me vous pouvez tenter les commandes \"de la derni\u00e8re chance\" ;-).<\/p>\n<p style=\"text-align: justify;\"><strong>Attention<\/strong> : en appliquant ces commandes vous allez engendrer un reboot direct (un peu comme si vous appuyez sur le bouton \"reset\" du serveur ...). Autant vous dire tout de suite que ce n'est pas vraiment ce qu'il y a de plus clean : rien ne va \u00eatre ferm\u00e9 proprement, pas de sync sur les disques bref un vrai reboot \u00e0 l'arrache (avec toutes les cons\u00e9quences possibles ...) !<\/p>\n<p>Voici donc les commandes \u00e0 utiliser :<\/p>\n<blockquote><p>echo 1 &gt; \/proc\/sys\/kernel\/sysrq<br \/>\necho b &gt; \/proc\/sysrq-trigger<\/p><\/blockquote>\n<p>Si vous pr\u00e9f\u00e9rez arr\u00eater compl\u00e9tement le serveur (attention quand m\u00eame si vous \u00eates \u00e0 plusieurs centaines de kilom\u00e8tres c'est peut \u00eatre pas une tr\u00e8s bonne id\u00e9e\u00a0 \ud83d\ude09 ) :<\/p>\n<blockquote><p>echo 1 &gt; \/proc\/sys\/kernel\/sysrq<br \/>\necho o &gt; \/proc\/sysrq-trigger<\/p><\/blockquote>\n<p style=\"text-align: justify;\">Ces commandes ont pour effet de simuler l'usage de la combinaison de touche apell\u00e9e \"<em><b>magic SysRq key<\/b><\/em>\". Cette combinaison de touche reconnue par le Kernel permet d\u2019effectuer des op\u00e9rations d'assez bas niveau sur votre syst\u00e8me. Si vous souhaitez en savoir plus vous pouvez consulter <a href=\"http:\/\/en.wikipedia.org\/wiki\/Magic_SysRq_key\" target=\"_blank\">cet article Wikipedia <\/a>.<\/p>\n<ul>\n<li>Cr\u00e9dit photo : <a id=\"yui_3_11_0_3_1395563763510_1310\" href=\"http:\/\/www.flickr.com\/photos\/thirtyfootscrew\/\" data-rapid_p=\"3\" data-track=\"photoAttributionNameClick\"> <\/a><a id=\"yui_3_11_0_3_1395563763510_1310\" href=\"http:\/\/www.flickr.com\/photos\/thirtyfootscrew\/\" data-rapid_p=\"3\" data-track=\"photoAttributionNameClick\"> <\/a><a id=\"yui_3_11_0_3_1395563763510_1310\" href=\"http:\/\/www.flickr.com\/photos\/thirtyfootscrew\/\" data-rapid_p=\"3\" data-track=\"photoAttributionNameClick\"> <\/a><a href=\"http:\/\/www.flickr.com\/photos\/thirtyfootscrew\/3324101122\/in\/faves-18689371@N00\/\" target=\"_blank\">Ashley Burton<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Vote serveur est h\u00e9berg\u00e9 dans un datacenter \u00e0 plusieurs centaines de kilom\u00e8tres. Vous disposez toujours d'un acc\u00e8s SSH mais la machine refuse de rebooter (Init 6, reboot, halt ... rien ne fonctionne...). Bien entendu vous ne disposez pas de module &hellip; <a href=\"https:\/\/www.collet-matrat.com\/?p=3092\">Lire la suite <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Sur le blog : \"Linux \/\/ Effectuer un reboot d'urgence \u00e0 distance\"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[105,91,7,11],"tags":[],"class_list":["post-3092","post","type-post","status-publish","format-standard","hentry","category-hebergement","category-howto","category-linux","category-utile"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=\/wp\/v2\/posts\/3092"}],"collection":[{"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3092"}],"version-history":[{"count":9,"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=\/wp\/v2\/posts\/3092\/revisions"}],"predecessor-version":[{"id":3103,"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=\/wp\/v2\/posts\/3092\/revisions\/3103"}],"wp:attachment":[{"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.collet-matrat.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}