{"id":6923,"date":"2026-05-16T11:42:24","date_gmt":"2026-05-16T14:42:24","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=6923"},"modified":"2026-05-16T12:51:15","modified_gmt":"2026-05-16T15:51:15","slug":"otimizar-memoria-ram-linux-server","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/otimizar-memoria-ram-linux-server\/","title":{"rendered":"Otimizar memoria ram no linux server e Evitar o OOM Killer"},"content":{"rendered":"<div id=\"helps-204965059\" 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 class=\"wp-block-paragraph\">Administrar um servidor exige m\u00e1xima efici\u00eancia dos recursos de hardware. Quando o assunto \u00e9 desempenho, saber <strong>otimizar memoria ram no <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">linux<\/a> server<\/strong> \u00e9 o divisor de \u00e1guas entre um sistema est\u00e1vel e quedas repentinas de servi\u00e7os essenciais. Ao contr\u00e1rio do que muitos pensam, ter pouca mem\u00f3ria livre no Linux nem sempre \u00e9 um problema, j\u00e1 que o kernel utiliza o espa\u00e7o ocioso como cache para acelerar a leitura de arquivos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Abaixo, veja o passo a passo pr\u00e1tico para realizar esse ajuste fino no seu ambiente de produ\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O uso incorreto de mem\u00f3ria RAM pode degradar completamente a performance do servidor. Para entender a otimiza\u00e7\u00e3o completa do ambiente, veja o guia de <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/otimizar-vps-servidor-dedicado-cloud\/\" target=\"_blank\" rel=\"noreferrer noopener\">otimizar VPS, servidor dedicado e cloud<\/a><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-como-analisar-o-consumo-antes-de-comecar\">Como analisar o consumo antes de come\u00e7ar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de aplicar qualquer comando, use a ferramenta <code>htop<\/code> ou o comando <code>free -h<\/code> para mapear o consumo atual. Identifique se os grandes vil\u00f5es s\u00e3o os bancos de dados (como MySQL e PostgreSQL) ou servidores web (como Apache e Nginx).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-1-configurando-a-swappiness-corretamente\">1. Configurando a Swappiness Corretamente<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A &#8220;Swappiness&#8221; dita a agressividade com que o sistema move dados da mem\u00f3ria f\u00edsica para o disco (Swap). O padr\u00e3o de f\u00e1brica costuma ser 60, o que \u00e9 muito alto para servidores.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para <strong>otimizar memoria ram no linux server<\/strong>, o ideal \u00e9 reduzir o valor da Swappiness para algo entre 10 e 30. Isso for\u00e7a o kernel a priorizar a mem\u00f3ria RAM f\u00edsica, que \u00e9 infinitamente mais r\u00e1pida que o disco. Altere adicionando <code>vm.swappiness = 10<\/code> no seu arquivo <code>\/etc\/sysctl.conf<\/code>. No prompt digite sysctl -p para aplicar as altera\u00e7\u00f5es.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Problemas de mem\u00f3ria devem ser analisados junto com outras m\u00e9tricas do sistema. Veja tamb\u00e9m:<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/swap-alto-com-ram-livre-linux\/\" target=\"_blank\" rel=\"noreferrer noopener\">como resolver swap alto<\/a><\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/memory-leak-linux-detectar-resolver\/\" target=\"_blank\" rel=\"noreferrer noopener\">como identificar memory leak<\/a><\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/usar-vmstat-para-achar-gargalo-linux\/\" target=\"_blank\" rel=\"noreferrer noopener\">como analisar uso de mem\u00f3ria com vmstat<\/a><\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-otimizando-os-arquivos-de-configuracao-dos-servicos\">2. Otimizando os Arquivos de Configura\u00e7\u00e3o dos Servi\u00e7os<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e3o adianta alterar as propriedades do sistema operacional se o seu servidor web ou banco de dados estiver configurado para consumir mais mem\u00f3ria do que o servidor possui.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>No <a href=\"https:\/\/www.mysql.com\/\">MySQL<\/a>\/<a href=\"https:\/\/mariadb.org\/\">MariaDB<\/a>:<\/strong> Ajuste o <code>innodb_buffer_pool_size<\/code> para ocupar no m\u00e1ximo 70% da RAM se o servidor for dedicado, ou menos se dividir espa\u00e7o com aplica\u00e7\u00f5es web.<\/li>\n\n\n\n<li><strong>No Apache:<\/strong> Substitua o m\u00f3dulo <em>prefork<\/em> pelo <em>event<\/em> para reduzir drasticamente o consumo por requisi\u00e7\u00e3o simult\u00e2nea.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A mem\u00f3ria influencia diretamente estabilidade e velocidade do sistema. Confira como melhorar a <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/otimizar-vps-servidor-dedicado-cloud\/\">performance do servidor<\/a><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusao\">Conclus\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Manter o monitoramento constante e aplicar essas configura\u00e7\u00f5es \u00e9 o segredo para <strong>otimizar memoria ram no linux server<\/strong> com seguran\u00e7a. Evite o uso de scripts que prometem &#8220;limpar a RAM automaticamente&#8221;, pois eles destroem o cache do sistema e causam lentid\u00e3o de I\/O no disco. Foque em limitar seus servi\u00e7os e ajustar o comportamento do kernel para colher os melhores resultados de performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para manter estabilidade e desempenho, \u00e9 importante otimizar todo o ambiente. Consulte o guia de <strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/otimizar-vps-servidor-dedicado-cloud\/\" target=\"_blank\" rel=\"noreferrer noopener\">otimizar VPS, servidor dedicado e cloud<\/a><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-perguntas-frequentes-faq\">Perguntas Frequentes (FAQ)<\/h3>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1778941331172\"><strong class=\"schema-faq-question\">Como ver o uso real de mem\u00f3ria no Linux?<\/strong> <p class=\"schema-faq-answer\">Para visualizar o uso real, utilize o comando <code>free -h<\/code> no terminal. Foque sempre na coluna &#8220;available&#8221; (dispon\u00edvel), pois o Linux gerencia o espa\u00e7o livre automaticamente para cache de disco.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778941356635\"><strong class=\"schema-faq-question\">O que \u00e9 o erro OOM Killer e como evitar?<\/strong> <p class=\"schema-faq-answer\">O OOM (Out Of Memory) Killer \u00e9 um mecanismo do kernel que encerra processos pesados para evitar o colapso do sistema quando a RAM esgota. Voc\u00ea pode evit\u00e1-lo ajustando a mem\u00f3ria Swap e configurando corretamente o tamanho dos buffers do seu banco de dados.<br><strong>Limpar o cache do Linux com &#8220;drop_caches&#8221; melhora a performance?<\/strong> N\u00e3o. For\u00e7ar a limpeza do cache de mem\u00f3ria degrada a performance do servidor, pois obriga o sistema a ler arquivos diretamente do disco (I\/O lento) nas pr\u00f3ximas requisi\u00e7\u00f5es.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778941411525\"><strong class=\"schema-faq-question\">Qual \u00e9 a diferen\u00e7a entre mem\u00f3ria &#8220;Free&#8221; e &#8220;Available&#8221; no Linux?<\/strong> <p class=\"schema-faq-answer\">A mem\u00f3ria &#8220;Free&#8221; (livre) \u00e9 o espa\u00e7o que est\u00e1 completamente sem uso e ocioso. A mem\u00f3ria &#8220;Available&#8221; (dispon\u00edvel) mostra a quantidade real de RAM que pode ser liberada imediatamente para novos processos, incluindo o espa\u00e7o que o Linux est\u00e1 usando temporariamente como cache de disco.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778941424947\"><strong class=\"schema-faq-question\">Qual o valor ideal de Swappiness para um servidor de banco de dados?<\/strong> <p class=\"schema-faq-answer\">Para servidores dedicados a bancos de dados (como MySQL ou PostgreSQL), o valor ideal de Swappiness geralmente fica entre <strong>1 e 10<\/strong>. Isso impede que o kernel envie as p\u00e1ginas do banco de dados para o disco r\u00edgido, mantendo as consultas na mem\u00f3ria RAM para m\u00e1xima performance.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1778941454979\"><strong class=\"schema-faq-question\">O que faz o par\u00e2metro &#8220;vfs_cache_pressure&#8221; e como ele ajuda na RAM?<\/strong> <p class=\"schema-faq-answer\">O <code>vfs_cache_pressure<\/code> define a tend\u00eancia do kernel de liberar a mem\u00f3ria usada para cache de diret\u00f3rios e arquivos (inodes\/dentries). O valor padr\u00e3o \u00e9 100. Reduzi-lo para 50 faz o Linux reter mais cache de arquivos na RAM (\u00f3timo para servidores que acessam muitos arquivos pequenos); aument\u00e1-lo para 150 for\u00e7a a libera\u00e7\u00e3o r\u00e1pida desse cache.<\/p> <\/div> <\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-veja-tambem\">Veja Tamb\u00e9m:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/otimizar-vps-servidor-dedicado-cloud\/\" target=\"_blank\" rel=\"noreferrer noopener\">Como Otimizar VPS, Servidor Dedicado ou Cloud: Guia Completo<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/benchmark-vps-vs-servidor-dedicado-performance\/\">VPS vs Servidor Dedicado em 2026 (Guia T\u00e9cnico)<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/guia-completo-comando-sar-linux\/\">Definitivo: Como Dominar o Comando Sar Linux para Monitoramento<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/diagnostico-vps-lento-checklist\/\">Diagn\u00f3stico de VPS Lento: Checklist Completo e Definitivo<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/servidor-dedicado-lento-solucoes\/\">Servidor Dedicado Lento? 15 Causas e Solu\u00e7\u00f5es Definitivas (2026)<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/otimizar-uso-cpu-vps-linux\/\">Como Otimizar o Uso de CPU em uma VPS Linux: Guia Definitivo<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/servidor-dedicado-lento-causas-comuns\/\">Servidor dedicado lento? 10 causas comuns e como resolver<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Administrar um servidor exige m\u00e1xima efici\u00eancia dos recursos de hardware. Quando o assunto \u00e9 desempenho, saber otimizar memoria ram no linux server [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":6924,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4189],"tags":[90,7,59,4100,4129,4131,2940,2310,2522],"class_list":["post-6923","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-performance-e-otimizacao","tag-almalinux","tag-centos","tag-linux-server","tag-memoria-ram-4","tag-otimizacao-de-servidor-17","tag-performance-linux-12","tag-swap","tag-sysadmin","tag-ubuntu-server"],"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>Otimizar memoria ram no linux server e Evitar o OOM Killer<\/title>\n<meta name=\"description\" content=\"Aprenda como otimizar a mem\u00f3ria RAM no Linux Server de forma eficiente. 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Reduzi-lo para 50 faz o Linux reter mais cache de arquivos na RAM (\u00f3timo para servidores que acessam muitos arquivos pequenos); aument\u00e1-lo para 150 for\u00e7a a libera\u00e7\u00e3o r\u00e1pida desse cache.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"}]}},"lang":"pt","translations":{"pt":6923},"pll_sync_post":{},"_links":{"self":[{"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/posts\/6923","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/comments?post=6923"}],"version-history":[{"count":4,"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/posts\/6923\/revisions"}],"predecessor-version":[{"id":6932,"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/posts\/6923\/revisions\/6932"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/media\/6924"}],"wp:attachment":[{"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/media?parent=6923"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/categories?post=6923"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/helpsysadmin.com.br\/blog\/wp-json\/wp\/v2\/tags?post=6923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}