{"id":3409,"date":"2026-02-18T09:00:00","date_gmt":"2026-02-18T12:00:00","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=3409"},"modified":"2026-04-12T16:29:15","modified_gmt":"2026-04-12T19:29:15","slug":"oom-killer-linux-mysql-como-evitar","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/oom-killer-linux-mysql-como-evitar\/","title":{"rendered":"OOM Killer no Linux: Por que o MySQL \u00e9 morto e como evitar"},"content":{"rendered":"<div id=\"helps-2302387762\" 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-o-que-e-o-oom-killer-no-linux\">O que \u00e9 o OOM Killer no Linux?<\/h2>\n\n\n\n<p>O <strong>OOM Killer <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">Linux<\/a><\/strong> (Out Of Memory Killer) \u00e9 um mecanismo do Linux kernel que entra em a\u00e7\u00e3o quando a mem\u00f3ria RAM do servidor se esgota completamente.<\/p>\n\n\n\n<p>Quando n\u00e3o h\u00e1 mais mem\u00f3ria dispon\u00edvel para aloca\u00e7\u00e3o, o kernel precisa liberar recursos imediatamente. Para isso, ele seleciona e finaliza um processo com base em um c\u00e1lculo chamado <strong>OOM Score<\/strong>.<\/p>\n\n\n\n<p>Na pr\u00e1tica: ele \u201cmata\u201d um processo para impedir que o sistema inteiro trave.<\/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-por-que-o-oom-killer-mata-o-mysql\">Por que o OOM Killer mata o MySQL?<\/h2>\n\n\n\n<p>Servi\u00e7os de banco de dados como:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MySQL<\/li>\n\n\n\n<li>MariaDB<\/li>\n<\/ul>\n\n\n\n<p>costumam consumir muita mem\u00f3ria RAM \u2014 principalmente em ambientes com WordPress, m\u00faltiplos sites ou tr\u00e1fego elevado.<\/p>\n\n\n\n<p>O processo <code>mysqld<\/code> frequentemente recebe um OOM Score alto porque:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Usa muita mem\u00f3ria residente (RSS)<\/li>\n\n\n\n<li>Possui buffers grandes configurados<\/li>\n\n\n\n<li>Mant\u00e9m m\u00faltiplas conex\u00f5es abertas<\/li>\n<\/ul>\n\n\n\n<p>Quando a RAM acaba, o banco vira um alvo prov\u00e1vel.<\/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-como-identificar-se-o-oom-killer-foi-acionado\">Como identificar se o OOM Killer foi acionado<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-verifique-os-logs-do-kernel\">1\ufe0f\u20e3 Verifique os logs do kernel<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>dmesg -T | grep -i kill\n<\/pre><\/div>\n\n\n\n<p>Ou:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>journalctl -k | grep -i oom\n<\/pre><\/div>\n\n\n\n<p>Exemplo de sa\u00edda:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>Out of memory: Kill process 1234 (mysqld)\nKilled process 1234 (mysqld)\n<\/pre><\/div>\n\n\n\n<p>Se essa mensagem aparecer, o <strong>OOM Killer Linux<\/strong> foi ativado.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-consulte-o-oom-score\">2\ufe0f\u20e3 Consulte o OOM Score<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>cat \/proc\/$(pidof mysqld)\/oom_score\ncat \/proc\/$(pidof mysqld)\/oom_score_adj\n<\/pre><\/div>\n\n\n\n<p>Quanto maior o n\u00famero, maior a probabilidade do processo ser finalizado.<\/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-principais-causas-do-oom-killer-matar-o-mysql\">Principais causas do OOM Killer matar o MySQL<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-buffer-pool-mal-dimensionado\">\ud83d\udd34 1. Buffer pool mal dimensionado<\/h3>\n\n\n\n<p>Configura\u00e7\u00e3o perigosa:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>innodb_buffer_pool_size = 6G\n<\/pre><\/div>\n\n\n\n<p>Em um servidor com 8GB totais.<\/p>\n\n\n\n<p>Isso deixa pouco espa\u00e7o para:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PHP-FPM<\/li>\n\n\n\n<li>Nginx \/ Apache<\/li>\n\n\n\n<li>Cache do sistema<\/li>\n\n\n\n<li>Kernel<\/li>\n<\/ul>\n\n\n\n<p><strong>Regra pr\u00e1tica:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Servidor dedicado para banco \u2192 60\u201370% da RAM<\/li>\n\n\n\n<li>Servidor compartilhado \u2192 30\u201350%<\/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-2-ausencia-de-swap\">\ud83d\udd34 2. Aus\u00eancia de swap<\/h3>\n\n\n\n<p>Sem swap, quando a RAM acaba, o <strong>OOM Killer Linux<\/strong> \u00e9 acionado imediatamente.<\/p>\n\n\n\n<p>Verifique:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>swapon --show\n<\/pre><\/div>\n\n\n\n<p>Se n\u00e3o houver swap ativo, o risco \u00e9 alto.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-excesso-de-processos-php-fpm\">\ud83d\udd34 3. Excesso de processos PHP-FPM<\/h3>\n\n\n\n<p>Cada worker pode consumir entre 50MB e 150MB.<\/p>\n\n\n\n<p>Exemplo:<\/p>\n\n\n\n<p>30 processos \u00d7 100MB = 3GB de RAM<\/p>\n\n\n\n<p>Isso reduz drasticamente a margem de seguran\u00e7a.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-ataques-ou-picos-de-trafego\">\ud83d\udd34 4. Ataques ou picos de tr\u00e1fego<\/h3>\n\n\n\n<p>Sem rate limiting no Nginx ou firewall adequado, o consumo de mem\u00f3ria pode disparar.<\/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-como-evitar-que-o-oom-killer-mate-o-mysql\">Como evitar que o OOM Killer mate o MySQL<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-configure-swap-corretamente\">\u2705 1. Configure swap corretamente<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>fallocate -l 2G \/swapfile\nchmod 600 \/swapfile\nmkswap \/swapfile\nswapon \/swapfile\n<\/pre><\/div>\n\n\n\n<p>Adicione ao <code>\/etc\/fstab<\/code> para persistir ap\u00f3s reboot. \/swapfile &nbsp; swap&nbsp; &nbsp; swap&nbsp; &nbsp; sw&nbsp; 0 &nbsp; 0<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-ajuste-o-swappiness\">\u2705 2. Ajuste o swappiness<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>sysctl vm.swappiness=10\n<\/pre><\/div>\n\n\n\n<p>Persistente:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>echo &quot;vm.swappiness=10&quot; &gt;&gt; \/etc\/sysctl.conf\n<\/pre><\/div>\n\n\n\n<p>Isso reduz o uso agressivo de swap.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-ajuste-corretamente-o-mysql-mariadb\">\u2705 3. Ajuste corretamente o MySQL\/MariaDB<\/h3>\n\n\n\n<p>Revise:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>innodb_buffer_pool_size<\/code><\/li>\n\n\n\n<li><code>max_connections<\/code><\/li>\n\n\n\n<li><code>tmp_table_size<\/code><\/li>\n\n\n\n<li><code>join_buffer_size<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u26a0\ufe0f Aten\u00e7\u00e3o: alguns buffers s\u00e3o multiplicados por conex\u00e3o.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-controle-o-php-fpm\">\u2705 4. Controle o PHP-FPM<\/h3>\n\n\n\n<p>No <code>www.conf<\/code>(dependendo da sua distribui\u00e7\u00e3o linux e painel o nome pode ser outro):<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>pm = dynamic\npm.max_children = 20\n<\/pre><\/div>\n\n\n\n<p>C\u00e1lculo recomendado: <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/php-fpm-como-calcular-pm-max_children\/\" target=\"_blank\" rel=\"noreferrer noopener\">Clique aqui e veja PHP-FPM: Como Calcular pm.max_children Corretamente<\/a><\/strong><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>RAM dispon\u00edvel \/ consumo m\u00e9dio por processo\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-5-ajuste-o-oomscore-do-mysql-opcional\">\u2705 5. Ajuste o OOMScore do MySQL (opcional)<\/h3>\n\n\n\n<p>Para reduzir a chance do banco ser morto:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>echo -5 &gt; \/proc\/$(pidof mysqld)\/oom_score_adj\n<\/pre><\/div>\n\n\n\n<p>Ou via systemd:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>systemctl edit mysqld\n<\/pre><\/div>\n\n\n\n<p>Adicionar:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>[Service]\nOOMScoreAdjust=-5\n<\/pre><\/div>\n\n\n\n<p>Use com cautela \u2014 outro servi\u00e7o pode ser finalizado no lugar.<\/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-monitoramento-preventivo\">Monitoramento preventivo<\/h2>\n\n\n\n<p>Ferramentas como:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Zabbix<\/li>\n\n\n\n<li>Prometheus<\/li>\n\n\n\n<li>Grafana<\/li>\n<\/ul>\n\n\n\n<p>permitem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Alertas antes da RAM esgotar<\/li>\n\n\n\n<li>Visualiza\u00e7\u00e3o de tend\u00eancia<\/li>\n\n\n\n<li>Detec\u00e7\u00e3o de memory leaks<\/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-conclusao\">Conclus\u00e3o<\/h2>\n\n\n\n<p>O <strong>OOM Killer Linux<\/strong> n\u00e3o \u00e9 um erro \u2014 \u00e9 um mecanismo de prote\u00e7\u00e3o.<\/p>\n\n\n\n<p>Se ele matou seu MySQL, a causa normalmente \u00e9:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Superdimensionamento do banco<\/li>\n\n\n\n<li>Falta de swap<\/li>\n\n\n\n<li>Excesso de processos PHP<\/li>\n\n\n\n<li>Falta de monitoramento<\/li>\n<\/ul>\n\n\n\n<p>Infraestrutura est\u00e1vel \u00e9 infraestrutura dimensionada corretamente.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">FAQ<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1771261921213\"><strong class=\"schema-faq-question\">O que \u00e9 OOM Killer no Linux?<\/strong> <p class=\"schema-faq-answer\">\u00c9 um mecanismo do kernel que finaliza processos quando a mem\u00f3ria RAM acaba, evitando que o sistema trave completamente.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771261957282\"><strong class=\"schema-faq-question\">Por que o MySQL \u00e9 frequentemente morto?<\/strong> <p class=\"schema-faq-answer\">Porque geralmente consome muita mem\u00f3ria e recebe um OOM Score alto.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771261969708\"><strong class=\"schema-faq-question\">Ter swap evita o OOM Killer?<\/strong> <p class=\"schema-faq-answer\">Ajuda significativamente, pois cria uma margem antes da RAM esgotar totalmente.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771261995362\"><strong class=\"schema-faq-question\">Posso impedir o MySQL de ser morto?<\/strong> <p class=\"schema-faq-answer\">\u00c9 poss\u00edvel reduzir a probabilidade ajustando o <code>oom_score_adj<\/code>, mas isso deve ser feito com cautela.<\/p> <\/div> <\/div>\n\n\n\n<p><strong>[Precisa de ajuda com outro problema?\u00a0<br><a href=\"https:\/\/helpsysadmin.com.br\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nossa equipe est\u00e1 dispon\u00edvel 24 horas por dia, 7 dias por semana<\/a>\u00a0.]<\/strong><\/p>\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\/troubleshooting-linux-metodo-use\/\" target=\"_blank\" rel=\"noreferrer noopener\">A Arte do Troubleshooting Linux: Diagnosticando problemas complexos(Metodologia USE \u2013 Utilization, Saturation, Errors)<\/a><\/strong><\/p>\n\n\n\n<p id=\"h-veja-mais-como-reduzir-o-tempo-de-resposta-ttfb-do-servidor\"><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/cpu-ociosa-sistema-lento\/\" target=\"_blank\" rel=\"noreferrer noopener\">CPU ociosa com sistema lento: como identificar gargalos reais no servidor<\/a><\/strong><\/p>\n\n\n\n<p id=\"h-veja-mais-como-reduzir-o-tempo-de-resposta-ttfb-do-servidor\"><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/oom-killer-linux-mysql-como-evitar\/\">OOM Killer no Linux: Por que o MySQL \u00e9 morto e como evitar<\/a><\/strong><\/p>\n\n\n\n<p><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/processos-zumbis-linux-como-limpar\/\">Processos Zumbis: O que s\u00e3o e como limpar a tabela de processos<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O que \u00e9 o OOM Killer no Linux? O OOM Killer Linux (Out Of Memory Killer) \u00e9 um mecanismo do Linux kernel [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3410,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4187],"tags":[3551,3547,3545,3543,3553,3549,3555],"class_list":["post-3409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monitoramento-e-troubleshooting","tag-erro-out-of-memory-mysql","tag-mariadb-out-of-memory","tag-mysql-killed","tag-oom-killer-linux","tag-otimizacao-mysql-vps","tag-servidor-linux-sem-memoria","tag-swap-linux-configuracao"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>OOM Killer no Linux: Por que o MySQL \u00e9 morto e como evitar<\/title>\n<meta name=\"description\" content=\"Entenda por que o OOM Killer do 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