{"id":5227,"date":"2018-10-22T12:07:50","date_gmt":"2018-10-22T10:07:50","guid":{"rendered":"https:\/\/www.commander1024.de\/wordpress\/?p=5227"},"modified":"2018-10-22T12:07:55","modified_gmt":"2018-10-22T10:07:55","slug":"system-mit-magic-sysrq-neu-starten","status":"publish","type":"post","link":"https:\/\/www.commander1024.de\/wordpress\/2018\/10\/system-mit-magic-sysrq-neu-starten\/","title":{"rendered":"System mit magic SysRq neu starten"},"content":{"rendered":"\n<p class=\"has-drop-cap\">Es sind nun schon ein paar J\u00e4hrchen, die ich im IT-Showgesch\u00e4ft arbeite. Und ich sch\u00e4me mich tats\u00e4chlich ein bisschen, dass ich erst im Jahr 2018 von der Existenz des gro\u00dfartigen &#8222;magic SysRq&#8220; erfahre. <\/p> \n\n\n\n <p> Den &#8222;<a href=\"https:\/\/de.wikipedia.org\/wiki\/Klammergriff\" target=\"_blank\" rel=\"noreferrer noopener\">Klammergriff<\/a>&#8220; kennen die meisten noch. Dieser wird aber relativ weit oben im Softwarestack vom OS abgefangen. So kann dem User durchaus erst eine grafische R\u00fcckfrage vorgelegt werden, ob man das System nun neustarten oder ausschalten m\u00f6chte. <\/p> \n\n\n\n <p> Doch ist der Rechner so sehr besch\u00e4ftigt, dass er kaum noch oder gar nicht mehr reagiert, hiflt der nicht mehr. Hier kommt der &#8222;magic SysRq&#8220; als deutlich bessere Variante gegen\u00fcber dem forcierten Poweroff ins Spiel &#8211; sofern er aktiviert ist. <\/p> \n\n\n\n<h3 class=\"wp-block-heading\">sysRq Status \u00fcberpr\u00fcfen<\/h3>\n\n\n\n <p> Viele Distributionen allerdings schalten diese Funktionalit\u00e4t im Auslieferungszustand allerdings ab &#8211; so zum Beispiel <a href=\"https:\/\/getfedora.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">Fedora<\/a> und <a href=\"https:\/\/www.archlinux.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">Arch<\/a>, bei <a href=\"https:\/\/www.debian.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">debian<\/a> hingegen ist ein Subset aktiv. <\/p> \n\n\n\n <p> Dies kann man mit sysctl pr\u00fcfen: <\/p> \n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">mscholz<\/span><span class=\"hljs-keyword\">@didymos<\/span>  ~ # sysctl kernel.sysrq\nkernel.sysrq = <span class=\"hljs-number\">16<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code-Sprache:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n <p> oder durch sysfs: <\/p> \n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">mscholz<\/span><span class=\"hljs-keyword\">@didymos<\/span>  ~ # cat \/proc\/sys\/kernel\/sysrq\n<span class=\"hljs-number\">16<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code-Sprache:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n <p> Folgende Werte k\u00f6nnen in dieser sysctl-Variable stehen. Freigeschaltete Funktionen addieren ihre Werte &#8211; \u00e4hnlich den Dateirechten bei chmod &#8211; zusammen. So ergibt das debian stretch default von &#8218;438&#8216; alle Rechte au\u00dfer 64 und 8 (438-256-128-32-16-4-2=0). <\/p> \n\n\n\n <p> M\u00f6gliche Werte \/ Funktionen in der folgenden Aufstellung: <\/p> \n\n\n\n<pre class=\"wp-block-preformatted\"> 0 - disable sysrq completely<br \/> 1 - enable all functions of sysrq<br \/>&gt;1 - bitmask of allowed sysrq functions (see below for detailed function description):<br \/>    2 - enable control of console logging level<br \/>    4 - enable control of keyboard (SAK, unraw)<br \/>    8 - enable debugging dumps of processes etc.<br \/>   16 - enable sync command<br \/>   32 - enable remount read-only<br \/>   64 - enable signalling of processes (term, kill, oom-kill)<br \/>  128 - allow reboot\/poweroff<br \/>  256 - allow nicing of all RT task<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">magic SysRq aktiveren<\/h3>\n\n\n\n <p> Aktivieren kann man den SysRq ebenfalls mit sysctl. Tempor\u00e4r mit: <\/p> \n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">mscholz<\/span><span class=\"hljs-keyword\">@didymos<\/span> ~ # sudo sysctl -w kernel.sysrq=<span class=\"hljs-number\">1<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code-Sprache:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n <p> Um die \u00c4nderung dauerhaft (beim Booten) zu aktiveren, kann man &#8218;<em>kernel.sysrq = 1<\/em>&#8218; in die \/etc\/sysctl.conf oder besser in eine neu zu erstellende \/etc\/sysctl.d\/90-sysrq.conf einf\u00fcgen. <br \/>  <\/p> \n\n\n\n<h2 class=\"wp-block-heading\">Magic SysRq benutzen<\/h2>\n\n\n\n <p> Nun k\u00f6nnen die SysRq Befehle &#8211; auf verschiedene Arten &#8211; verwendet werden. <\/p> \n\n\n\n<h4 class=\"wp-block-heading\">An der Tastatur des nicht reagierenden Systems<\/h4>\n\n\n\n <p> Direkt am Rechner sitzen, dr\u00fcckt man gleichzeitig Alt + Druck (PrntScrn) und ohne die Finger von den Tasten zu l\u00f6sen die gew\u00fcnschten Befehle. Die n\u00fctzlichste und gel\u00e4ufigste Kombination d\u00fcrfte <strong>REISUB<\/strong> sein. <\/p> \n\n\n\n <p> Alt + Druck + R + E + I + S + U + B, kann sich gut mit diesen Eselsbr\u00fccken gemerkt werden: <strong>R<\/strong>eboot <strong>E<\/strong>ven <strong>I<\/strong>f <strong>S<\/strong>ystem <strong>U<\/strong>tterly <strong>B<\/strong>roken oder <strong>BUSIER.<\/strong> <\/p> \n\n\n\n<h4 class=\"wp-block-heading\">\u00dcber eine serielle Konsole<\/h4>\n\n\n\n <p> Nach dem Sendes eines BREAK hat man 5 Sekunden Zeit, die Befehle zu tippen. 2 BREAKs in Folge senden ein normales BREAK. <br \/>  <\/p> \n\n\n\n<h4 class=\"wp-block-heading\">\u00dcberall und mit Skript <br \/> <\/h4>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">mscholz<\/span><span class=\"hljs-keyword\">@didymos<\/span> ~ # echo reisub &gt; \/proc\/sysrq-trigger<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code-Sprache:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">Komplette Liste der SysRq Befehle:<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">    'b' - Will immediately reboot the system without syncing or unmounting your disks.<br \/>    'c' - Will perform a kexec reboot in order to take a crashdump.<br \/>    'd' - Shows all locks that are held.<br \/>    'e' - Send a SIGTERM to all processes, except for init.<br \/>    'f' - Will call oom_kill to kill a memory hog process.<br \/>    'g' - Used by kgdb on ppc and sh platforms.<br \/>    'h' - Will display help (any key that is not listed here will bring forth help )<br \/>    'i' - Send a SIGKILL to all processes, except for init.<br \/>    'k' - Secure Access Key (SAK)\u00b9 Kills all programs on the current virtual terminal.<br \/>    'l' - Shows a stack backtrace for all active CPUs.<br \/>    'm' - Will dump current memory info to your console.<br \/>    'n' - Used to make RT tasks nice-able<br \/>    'o' - Will shut your system off (if configured and supported).<br \/>    'p' - Will dump the current registers and flags to your console.<br \/>    'q' - Will dump a list of all running timers.<br \/>    'r' - Turns off keyboard raw mode and sets it to XLATE.<br \/>    's' - Will attempt to sync all mounted filesystems.<br \/>    't' - Will dump a list of current tasks and their information to your console.<br \/>    'u' - Will attempt to remount all mounted filesystems read-only.<br \/>    'v' - Dumps Voyager SMP processor info to your console.<br \/>    'w' - Dumps tasks that are in uninterruptable (blocked) state.<br \/>    'x' - Used by xmon interface on ppc\/powerpc platforms.<br \/>'0'-'9' - Sets the console log level, controlling which kernel messages will be printed to your console. ('0', for example would make it so that only emergency messages like PANICs or OOPSes would make it to your console.)<\/pre>\n\n\n\n<ol class=\"wp-block-list\"><li>Sa&#8217;k&#8216; (Secure Access Key) is useful when you want to be sure there is no trojan program running at console which could grab your password when you would try to login. It will kill all programs on given console, thus letting you make sure that the login prompt you see is actually the one from init, not some trojan program. Others find it useful as (System Attention Key) which is useful when you want to exit a program that will not let you switch consoles. (For example, X or a svgalib program.)<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":" <p> Es sind nun schon ein paar J\u00e4hrchen, die ich im IT-Showgesch\u00e4ft arbeite. Und ich sch\u00e4me mich tats\u00e4chlich ein bisschen, dass ich erst im Jahr 2018 von der Existenz des gro\u00dfartigen &#8222;magic SysRq&#8220; erfahre. Den &#8222;Klammergriff&#8220; kennen die meisten noch. Dieser wird aber relativ weit oben im Softwarestack vom OS abgefangen. So kann dem User durchaus&hellip; <\/p> \n","protected":false},"author":1,"featured_media":5239,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"activitypub_content_warning":"","activitypub_content_visibility":"","activitypub_max_image_attachments":4,"activitypub_interaction_policy_quote":"anyone","activitypub_status":"","footnotes":""},"categories":[12,3],"tags":[381,370,429],"class_list":["post-5227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administration","category-linux","tag-administration","tag-linux","tag-sysrq","comments-open","no-comments"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>System mit magic SysRq neu starten &#8211; Commander1024<\/title>\n<meta name=\"description\" content=\"Der &quot;magic SysRq&quot; ist die bessere Alternative zum Reset oder Poweroff, um ein nicht mehr reagierendes System neuzustarten, wenn Strg+Alt+Ent nicht reicht.\" \/>\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.commander1024.de\/wordpress\/2018\/10\/system-mit-magic-sysrq-neu-starten\/\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Marcus Scholz\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"4\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/2018\\\/10\\\/system-mit-magic-sysrq-neu-starten\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/2018\\\/10\\\/system-mit-magic-sysrq-neu-starten\\\/\"},\"author\":{\"name\":\"Marcus Scholz\",\"@id\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/#\\\/schema\\\/person\\\/aebb61d9f57867e2234becde6d99da8d\"},\"headline\":\"System mit magic SysRq neu starten\",\"datePublished\":\"2018-10-22T10:07:50+00:00\",\"dateModified\":\"2018-10-22T10:07:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/2018\\\/10\\\/system-mit-magic-sysrq-neu-starten\\\/\"},\"wordCount\":465,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/#\\\/schema\\\/person\\\/aebb61d9f57867e2234becde6d99da8d\"},\"image\":{\"@id\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/2018\\\/10\\\/system-mit-magic-sysrq-neu-starten\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/wp-content\\\/uploads\\\/2018\\\/10\\\/DSC_0169-e1540202243283-scaled.jpg\",\"keywords\":[\"Administration\",\"Linux\",\"Sysrq\"],\"articleSection\":[\"Administration\",\"Linux\"],\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/2018\\\/10\\\/system-mit-magic-sysrq-neu-starten\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/2018\\\/10\\\/system-mit-magic-sysrq-neu-starten\\\/\",\"url\":\"https:\\\/\\\/www.commander1024.de\\\/wordpress\\\/2018\\\/10\\\/system-mit-magic-sysrq-neu-starten\\\/\",\"name\":\"System mit magic SysRq neu starten &#8211; 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