{"id":3164,"date":"2026-02-10T15:00:00","date_gmt":"2026-02-10T18:00:00","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=3164"},"modified":"2026-04-28T19:34:34","modified_gmt":"2026-04-28T22:34:34","slug":"como-evitar-oom-killer-linux","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/como-evitar-oom-killer-linux\/","title":{"rendered":"OOM Killer: Como Evitar e Otimizar a Mem\u00f3ria do Servidor Linux"},"content":{"rendered":"<div id=\"helps-4006634517\" 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<p>O <strong>OOM Killer<\/strong> (Out of Memory Killer) \u00e9 um mecanismo do kernel do <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">Linux<\/a> que entra em a\u00e7\u00e3o quando o sistema esgota sua mem\u00f3ria RAM e Swap. Para evitar que o sistema inteiro trave (kernel panic), ele sacrifica processos espec\u00edficos para liberar mem\u00f3ria.<\/p>\n\n\n\n<p>Se voc\u00ea est\u00e1 lidando com isso em ambientes de alta performance como os que gerencia, aqui est\u00e3o as estrat\u00e9gias principais para domar o OOM Killer:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-otimizacao-de-aplicacoes-criticas\">1. Otimiza\u00e7\u00e3o de Aplica\u00e7\u00f5es Cr\u00edticas<\/h2>\n\n\n\n<p>Antes de mexer no kernel, o foco deve ser nos &#8220;comil\u00f5es&#8221; de mem\u00f3ria:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MySQL\/MariaDB:<\/strong> Ajuste o <code>innodb_buffer_pool_size<\/code>. Em servidores com 64GB de RAM, ele n\u00e3o deve ocupar 100% da mem\u00f3ria; deixe margem para o sistema (geralmente setar em 70-80% da RAM dispon\u00edvel).<\/li>\n\n\n\n<li><strong>PHP-FPM:<\/strong> Limite o <code>pm.max_children<\/code>. Cada processo PHP consome uma fatia consider\u00e1vel; se voc\u00ea tiver muitos processos simult\u00e2neos, a mem\u00f3ria vai evaporar rapidamente.<\/li>\n\n\n\n<li><strong>LiteSpeed\/Apache:<\/strong> Verifique os limites de conex\u00f5es simult\u00e2neas para evitar o empilhamento de processos.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-ajuste-do-overcommit-do-kernel\">2. Ajuste do &#8220;Overcommit&#8221; do Kernel<\/h2>\n\n\n\n<p>O Linux, por padr\u00e3o, permite que processos solicitem mais mem\u00f3ria do que realmente existe fisicamente (overcommit). Voc\u00ea pode tornar o kernel mais &#8220;conservador&#8221;.<\/p>\n\n\n\n<p>Edite o arquivo <code>\/etc\/sysctl.conf<\/code>:<\/p>\n\n\n\n<p>Bash<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre># Define como o kernel lida com overcommit\n# 2 = N\u00e3o permite overcommit acima de uma porcentagem da RAM + Swap\nvm.overcommit_memory = 2\n# Define a porcentagem de RAM a ser usada no c\u00e1lculo acima\nvm.overcommit_ratio = 80\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Aten\u00e7\u00e3o:<\/strong> Isso pode fazer com que processos falhem ao iniciar se n\u00e3o houver mem\u00f3ria &#8220;prometida&#8221; dispon\u00edvel, mas evita que o OOM Killer precise matar processos em execu\u00e7\u00e3o.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-priorizacao-de-processos-oom-score\">3. Prioriza\u00e7\u00e3o de Processos (OOM Score)<\/h2>\n\n\n\n<p>Voc\u00ea pode dizer ao kernel: &#8220;Se precisar matar algu\u00e9m, n\u00e3o mate o MySQL&#8221;. Cada processo tem um valor chamado <code>oom_score_adj<\/code> (de -1000 a 1000). Quanto menor o valor, menor a chance de ser morto.<\/p>\n\n\n\n<p>Para proteger o MariaDB, por exemplo:<\/p>\n\n\n\n<p>Bash<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre># Protege o processo (substitua pelo PID real)\necho -1000 &gt; \/proc\/$(pidof mariadbd)\/oom_score_adj\n<\/pre><\/div>\n\n\n\n<p><em>Dica: Voc\u00ea pode automatizar isso via Systemd adicionando <code>OOMScoreAdjust=-1000<\/code> na unit do servi\u00e7o.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-4-gestao-de-swap-e-zram\">4. Gest\u00e3o de Swap e Zram<\/h2>\n\n\n\n<p>Em servidores modernos, o Swap em disco (SSD\/NVMe) \u00e9 uma rede de seguran\u00e7a, mas o <strong>Zram<\/strong> (Swap comprimido na RAM) \u00e9 muito mais eficiente para evitar lat\u00eancia extrema antes do OOM Killer agir.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mantenha o <code>vm.swappiness<\/code> entre <strong>10<\/strong> e <strong>30<\/strong> para servidores de banco de dados, garantindo que o sistema use a RAM f\u00edsica o m\u00e1ximo poss\u00edvel, mas tenha onde &#8220;respirar&#8221; se necess\u00e1rio. Edite nano <code>\/etc\/sysctl.conf<\/code> e insira <code>vm.swappiness<\/code>= 10. Saia do editor e execute sysctl -p para ativar as altera\u00e7\u00f5es.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-5-monitoramento-proativo\">5. Monitoramento Proativo<\/h2>\n\n\n\n<p>O segredo para evitar o OOM Killer \u00e9 saber que ele est\u00e1 chegando.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CloudLinux:<\/strong> Utilize o LVE Manager para limitar a mem\u00f3ria por usu\u00e1rio\/conta, evitando que um \u00fanico site derrube o servidor inteiro.<\/li>\n\n\n\n<li><strong>Alertas:<\/strong> Configure o monitoramento (Zabbix, Netdata ou Grafana) para alertar quando a mem\u00f3ria livre (incluindo buffers\/cache) cair abaixo de 10%.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-veja-mais\">Veja Mais:<\/h3>\n\n\n\n<p><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/almalinux-producao-boas-praticas\/\" target=\"_blank\" rel=\"noreferrer noopener\">AlmaLinux em Produ\u00e7\u00e3o: Guia de Boas Pr\u00e1ticas e Seguran\u00e7a 2026<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/fail2ban-vs-crowdsec-em-producao\/\" target=\"_blank\" rel=\"noreferrer noopener\">Fail2Ban vs CrowdSec em Produ\u00e7\u00e3o: Qual \u00e9 a Melhor Solu\u00e7\u00e3o de Seguran\u00e7a para Servidores Linux?<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-funciona-servidor-linux-producao\/\" target=\"_blank\" rel=\"noreferrer noopener\">Como Funciona um Servidor Linux em Produ\u00e7\u00e3o: Do Boot aos Servi\u00e7os Ativos<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/infraestrutura-como-produto-visao-estrategica\/\" target=\"_blank\" rel=\"noreferrer noopener\">Infraestrutura como Produto: Transformando TI em Ativo Estrat\u00e9gico<\/a><\/strong><br><strong><a href=\"http:\/\/xn--timeouts%20mal%20configurados%20e%20seu%20impacto%20real%20em%20produo-21f10a\/\" target=\"_blank\" rel=\"noreferrer noopener\">Timeouts mal configurados e seu impacto real em produ\u00e7\u00e3o<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/diferenca-load-average-cpu-usage\/\" target=\"_blank\" rel=\"noreferrer noopener\">Load Average e CPU Usage: Qual a Diferen\u00e7a e Como Analisar?<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O OOM Killer (Out of Memory Killer) \u00e9 um mecanismo do kernel do Linux que entra em a\u00e7\u00e3o quando o sistema esgota [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4236,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4187],"tags":[3165,2738,3159,3163,3157,3161,3167,2310],"class_list":["post-3164","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monitoramento-e-troubleshooting","tag-estabilidade-de-servidor","tag-kernel-linux","tag-linux-server-7","tag-mariadb-optimization","tag-oom-killer-3","tag-otimizacao-de-memoria","tag-php-fpm-memory","tag-sysadmin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OOM Killer: Como Evitar e Otimizar a Mem\u00f3ria do Servidor Linux<\/title>\n<meta name=\"description\" content=\"Seu servidor caiu do nada? 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