{"id":3057,"date":"2026-02-04T11:16:51","date_gmt":"2026-02-04T14:16:51","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=3057"},"modified":"2026-03-08T09:23:42","modified_gmt":"2026-03-08T12:23:42","slug":"evitar-oom-killer-linux","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/evitar-oom-killer-linux\/","title":{"rendered":"Como Evitar OOM Killer no Linux: Guia Completo para Servidores Est\u00e1veis"},"content":{"rendered":"<div id=\"helps-792864152\" class=\"helps-before-content-2 helps-entity-placement\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3661896953164277\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- 2anuncios display quadrado -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3661896953164277\"\r\n     data-ad-slot=\"5051229894\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-1-entendendo-o-oom-killer\">1\ufe0f\u20e3 Entendendo o OOM Killer<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>evitar OOM Killer<\/li>\n\n\n\n<li><strong>OOM Killer (Out Of Memory Killer)<\/strong> \u00e9 um mecanismo do kernel <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">Linux<\/a> que mata processos automaticamente quando o sistema fica sem mem\u00f3ria RAM e swap.<\/li>\n\n\n\n<li>Ele <strong>prioriza matar processos \u201cmenos importantes\u201d<\/strong>, mas pode afetar servi\u00e7os cr\u00edticos se a mem\u00f3ria estiver muito baixa.<\/li>\n\n\n\n<li>Sintomas comuns:\n<ul class=\"wp-block-list\">\n<li>Processos misteriosamente mortos.<\/li>\n\n\n\n<li>Logs com mensagens tipo: <code>Out of memory: Kill process 1234 (mysqld) score 987 or sacrifice child<\/code><\/li>\n\n\n\n<li>Swap completamente usada e alta carga de I\/O.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-monitorar-memoria-e-swap\">2\ufe0f\u20e3 Monitorar mem\u00f3ria e swap<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de evitar OOM, voc\u00ea precisa saber <strong>como e quando ele dispara<\/strong>:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>free -h      # mostra mem\u00f3ria e swap\nvmstat 1 5   # uso de mem\u00f3ria e CPU em tempo real\ntop \/ htop   # identificar processos que consomem mais RAM\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Swap cheia + RAM cheia<\/strong> = situa\u00e7\u00e3o cl\u00e1ssica que dispara OOM.<\/li>\n\n\n\n<li><strong>Load alto sem CPU<\/strong> geralmente indica waiting por mem\u00f3ria (IOWait).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-estrategias-para-evitar-oom\">3\ufe0f\u20e3 Estrat\u00e9gias para evitar OOM<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-a-aumentar-ram-e-swap\">A) Aumentar RAM e Swap<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Adicionar RAM f\u00edsica<\/strong> se poss\u00edvel.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/configurar-login-automatico-phpmyadmin\/\" data-internallinksmanager029f6b8e52c=\"3\" title=\"Como Configurar Login Autom\u00e1tico no phpMyAdmin via DirectAdmin\">Configurar<\/a> swap corretamente<\/strong>:<\/li>\n<\/ol>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre># Criar swap de 4GB, por exemplo\nsudo fallocate -l 4G \/swapfile\nsudo chmod 600 \/swapfile\nsudo mkswap \/swapfile\nsudo swapon \/swapfile\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ajuste o <strong>swappiness<\/strong> para controlar quando o Linux come\u00e7a a usar swap:<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>sudo sysctl vm.swappiness=10\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Valores baixos (~10) usam swap s\u00f3 em caso extremo.<\/li>\n\n\n\n<li>Valores altos (~60) come\u00e7am a usar swap mais cedo.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-b-limitar-memoria-de-processos\">B) Limitar mem\u00f3ria de processos<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Para servi\u00e7os cr\u00edticos (MySQL, PHP-FPM, Docker, etc.), defina limites de mem\u00f3ria.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-mysql-mariadb\">MySQL \/ MariaDB:<\/h4>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>[mysqld]\ninnodb_buffer_pool_size=2G\nmax_connections=100\n<\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-php-fpm\">PHP-FPM:<\/h4>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>pm.max_children = 20\nmemory_limit = 256M\n<\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-docker\">Docker:<\/h4>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>docker run --memory=&quot;512m&quot; ...\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Limites ajudam a evitar que um \u00fanico processo consuma toda a mem\u00f3ria.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-c-controlar-oom-killer-com-oom-score-adj\">C) Controlar OOM Killer com <code>oom_score_adj<\/code><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Voc\u00ea pode <strong>proteger processos cr\u00edticos<\/strong>:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre># MySQL, por exemplo\necho -1000 &gt; \/proc\/$(pidof mysqld)\/oom_score_adj\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Valor de <code>-1000<\/code> = <strong>protegido ao m\u00e1ximo<\/strong><\/li>\n\n\n\n<li>Valor de <code>+1000<\/code> = mais prov\u00e1vel de ser morto<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-d-monitoramento-e-alertas\">D) Monitoramento e alertas<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use <strong>alertas antes que a mem\u00f3ria acabe<\/strong>:\n<ul class=\"wp-block-list\">\n<li><code>Prometheus + Node Exporter<\/code><\/li>\n\n\n\n<li><code>Zabbix<\/code> ou <code>Netdata<\/code><\/li>\n\n\n\n<li>Scripts simples em cron que verificam mem\u00f3ria livre<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Exemplo simples:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>#!\/bin\/bash\nfree_mem=$(free -m | awk '\/Mem:\/ {print $7}')\nif [ &quot;$free_mem&quot; -lt 500 ]; then\n  echo &quot;ATEN\u00c7\u00c3O: Mem\u00f3ria livre abaixo de 500MB&quot;\nfi\n<\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-e-ajustar-comportamento-do-kernel\">E) Ajustar comportamento do kernel<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Voc\u00ea pode fazer o kernel <strong>priorizar swap vs OOM<\/strong>:<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>sudo sysctl -w vm.overcommit_memory=2\nsudo sysctl -w vm.overcommit_ratio=80\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>vm.overcommit_memory=2<\/code> \u2192 Linux s\u00f3 aloca mem\u00f3ria se houver certeza de que RAM+Swap \u00e9 suficiente.<\/li>\n\n\n\n<li><code>vm.overcommit_ratio=80<\/code> \u2192 m\u00e1ximo de 80% da mem\u00f3ria total pode ser comprometida.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-f-evitar-vazamentos-de-memoria\">F) Evitar vazamentos de mem\u00f3ria<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Servi\u00e7os mal configurados ou bugs podem consumir RAM progressivamente:\n<ul class=\"wp-block-list\">\n<li>Monitore logs e processos.<\/li>\n\n\n\n<li>Reinicie servi\u00e7os cr\u00edticos em hor\u00e1rios de baixa carga, se necess\u00e1rio.<\/li>\n\n\n\n<li>Use <code>cgroups<\/code> para limitar consumo de mem\u00f3ria de processos espec\u00edficos.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-checklist-rapido-para-prevenir-oom\">4\ufe0f\u20e3 Checklist r\u00e1pido para prevenir OOM<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>RAM suficiente para workload + swap configurada.<\/li>\n\n\n\n<li>Limites de mem\u00f3ria em MySQL, PHP, Docker, etc.<\/li>\n\n\n\n<li>Processos cr\u00edticos com <code>oom_score_adj=-1000<\/code>.<\/li>\n\n\n\n<li>Monitoramento ativo e alertas.<\/li>\n\n\n\n<li>Kernel configurado para overcommit seguro.<\/li>\n\n\n\n<li>Revis\u00e3o peri\u00f3dica de logs para detectar leaks.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>1\ufe0f\u20e3 Entendendo o OOM Killer 2\ufe0f\u20e3 Monitorar mem\u00f3ria e swap Antes de evitar OOM, voc\u00ea precisa saber como e quando ele dispara: [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4696,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,1279],"tags":[2344,21,13,2938,437,2936,2382,2360,2940],"class_list":["post-3057","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gerenciamento-servidor","category-linux","tag-administracao-de-servidores","tag-docker","tag-linux","tag-memoria-ram","tag-mysql","tag-oom-killer","tag-php-fpm","tag-servidores","tag-swap"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Como Evitar OOM Killer no Linux: Guia Completo para Servidores Est\u00e1veis<\/title>\n<meta name=\"description\" content=\"Evite que o OOM Killer mate processos no Linux configurando swap, limites de mem\u00f3ria e monitoramento.\" \/>\n<meta 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