{"id":15550,"date":"2025-12-18T23:59:02","date_gmt":"2025-12-18T22:59:02","guid":{"rendered":"https:\/\/www.palentino.es\/blog\/?p=15550"},"modified":"2025-12-19T00:04:53","modified_gmt":"2025-12-18T23:04:53","slug":"%f0%9f%90%a7-comando-oculto-linux-magic-sysrq-reisub","status":"publish","type":"post","link":"https:\/\/www.palentino.es\/blog\/%f0%9f%90%a7-comando-oculto-linux-magic-sysrq-reisub\/","title":{"rendered":"🐧 Comando oculto Linux: Magic SysRq (REISUB)"},"content":{"rendered":"

💥 Control total del sistema incluso cuando est\u00e1 congelado<\/em><\/p>\n

🧨 \u00bfQu\u00e9 es?<\/h3>\n

Magic SysRq<\/strong> es una combinaci\u00f3n especial a nivel de kernel<\/strong>.
\nFunciona aunque el sistema est\u00e9 colgado<\/strong>, sin interfaz gr\u00e1fica, sin SSH, sin nada.<\/p>\n

👉 Es literalmente un bot\u00f3n de emergencia del kernel Linux<\/strong>.<\/p>\n

\"\"<\/a><\/p>\n

<\/p>\n

\n

1️⃣ Activar Magic SysRq (si est\u00e1 deshabilitado)<\/h2>\n

echo 1 | sudo tee \/proc\/sys\/kernel\/sysrq<\/strong><\/span><\/p>\n

(Persistente en \/etc\/sysctl.conf)
\nkernel.sysrq = 1<\/strong><\/p>\n

\n

2️⃣ El combo legendario: REISUB<\/strong><\/h2>\n

Se ejecuta manteniendo pulsado<\/strong>:
\nAlt + SysRq (Print Screen)<\/strong><\/span><\/p>\n

Y luego, lento<\/strong>, una letra cada 2\u20133 segundos:
\nR E I S U B<\/strong><\/span><\/p>\n

\n

🧠 \u00bfQu\u00e9 hace cada letra?<\/h3>\n\n\n\n\n\n\n\n\n\n\n
Tecla<\/th>\nAcci\u00f3n (nivel kernel)<\/th>\n<\/tr>\n<\/thead>\n
R<\/strong><\/td>\nDevuelve control del teclado al kernel<\/td>\n<\/tr>\n
E<\/strong><\/td>\nMata procesos de forma limpia<\/td>\n<\/tr>\n
I<\/strong><\/td>\nMata procesos a la fuerza<\/em><\/td>\n<\/tr>\n
S<\/strong><\/td>\nSincroniza discos (flush)<\/td>\n<\/tr>\n
U<\/strong><\/td>\nRemonta discos en solo lectura<\/td>\n<\/tr>\n
B<\/strong><\/td>\nReinicio inmediato (sin corrupci\u00f3n)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

🔥 Resultado<\/strong>: reinicio seguro incluso en sistemas totalmente congelados.<\/p>\n

\n

⚠️ \u00bfPor qu\u00e9 es tan potente?<\/h3>\n
    \n
  • No depende de systemd<\/li>\n
  • No depende del entorno gr\u00e1fico<\/li>\n
  • No depende de red<\/li>\n
  • No depende de login<\/li>\n
  • Funciona en producci\u00f3n, servidores, industriales<\/strong><\/li>\n<\/ul>\n

    Es nivel root\u2026 pero m\u00e1s abajo<\/strong>.<\/p>\n

    \n

    🧪 Casos reales donde salva vidas<\/h3>\n
      \n
    • Servidores industriales bloqueados<\/li>\n
    • M\u00e1quinas sin monitor funcional<\/li>\n
    • Sistemas embebidos<\/li>\n
    • Kernel panic parcial<\/li>\n
    • Escritorios congelados sin SSH<\/li>\n<\/ul>\n
      \n

      🧠 Curiosidad brutal<\/h3>\n

      Muchos administradores Linux nunca lo usan<\/strong>
      \npero los que lo conocen\u2026 no reinician mal nunca m\u00e1s<\/strong>.<\/p>\n

       <\/p>\n","protected":false},"excerpt":{"rendered":"

      💥 Control total del sistema incluso cuando est\u00e1 congelado 🧨 \u00bfQu\u00e9 es? Magic SysRq es una combinaci\u00f3n especial a nivel de kernel. Funciona aunque el sistema est\u00e9 colgado, sin interfaz gr\u00e1fica, sin SSH, sin nada. 👉 Es literalmente un bot\u00f3n de emergencia del kernel Linux.<\/p>\n","protected":false},"author":1,"featured_media":5836,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[431],"tags":[],"class_list":["post-15550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux-2"],"_links":{"self":[{"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/posts\/15550","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/comments?post=15550"}],"version-history":[{"count":3,"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/posts\/15550\/revisions"}],"predecessor-version":[{"id":15554,"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/posts\/15550\/revisions\/15554"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/media\/5836"}],"wp:attachment":[{"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/media?parent=15550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/categories?post=15550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.palentino.es\/blog\/wp-json\/wp\/v2\/tags?post=15550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}