{"id":3187,"date":"2026-02-12T13:00:00","date_gmt":"2026-02-12T16:00:00","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=3187"},"modified":"2026-04-20T15:19:44","modified_gmt":"2026-04-20T18:19:44","slug":"checklist-diagnostico-por-sintoma-servidores-linux","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/checklist-diagnostico-por-sintoma-servidores-linux\/","title":{"rendered":"Checklist de Diagn\u00f3stico por Sintoma em Servidores Linux"},"content":{"rendered":"<div id=\"helps-1532775521\" 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>Diagn\u00f3stico por sintoma em servidores <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">Linux<\/a>. Em ambientes de produ\u00e7\u00e3o, <strong>o sintoma quase nunca aponta diretamente para a causa real do problema<\/strong>. Servidores lentos, sites fora do ar ou bancos de dados travando s\u00e3o apenas manifesta\u00e7\u00f5es vis\u00edveis de gargalos mais profundos.<\/p>\n\n\n\n<p>Este artigo apresenta um <strong>checklist t\u00e9cnico de diagn\u00f3stico por sintoma<\/strong>, focado em <strong>servidores Linux<\/strong>, pensado para <strong>sysadmins, SREs e profissionais de infraestrutura<\/strong> que precisam reduzir o MTTR (Mean Time To Repair) e evitar decis\u00f5es baseadas em achismo.<\/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-servidor-lento-ou-com-alta-latencia\">Servidor lento ou com alta lat\u00eancia<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-sintomas-comuns\">Sintomas comuns<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lentid\u00e3o geral<\/li>\n\n\n\n<li>SSH demorando para responder<\/li>\n\n\n\n<li>Comandos simples travando<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-checklist-inicial\">Checklist inicial<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>uptime<\/code> \u2192 load average maior que o n\u00famero de CPUs?<\/li>\n\n\n\n<li><code>top<\/code> ou <code>htop<\/code> \u2192 processos consumindo CPU ou mem\u00f3ria<\/li>\n\n\n\n<li><code>vmstat 1<\/code> \u2192 swap ativa (<code>si<\/code>\/<code>so<\/code> > 0)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-cpu\">CPU<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>mpstat -P ALL 1<\/code><\/li>\n\n\n\n<li><code>%wa<\/code> alto indica espera por disco<\/li>\n\n\n\n<li><code>%sy<\/code> alto pode indicar overhead de kernel, firewall ou rede<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-memoria\">Mem\u00f3ria<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>free -h<\/code><\/li>\n\n\n\n<li>Uso excessivo de swap<\/li>\n\n\n\n<li>Verificar OOM Killer:dmesg | grep-i oom<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-disco\">Disco<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>iostat -xz 1<\/code><\/li>\n\n\n\n<li><code>await<\/code> alto ou <code>%util<\/code> pr\u00f3ximo de 100%<\/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-site-fora-do-ar-http-502-503-ou-504\">Site fora do ar (HTTP 502, 503 ou 504)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-diagnostico-rapido\">Diagn\u00f3stico r\u00e1pido<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Servi\u00e7os ativos?systemctl status nginx apache2 php-fpm<\/li>\n\n\n\n<li>Portas escutando?ss -lntp<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-interpretacao-dos-erros\">Interpreta\u00e7\u00e3o dos erros<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>502 Bad Gateway<\/strong> \u2192 backend indispon\u00edvel (PHP-FPM, app)<\/li>\n\n\n\n<li><strong>503 Service Unavailable<\/strong> \u2192 satura\u00e7\u00e3o de workers<\/li>\n\n\n\n<li><strong>504 Gateway Timeout<\/strong> \u2192 backend lento ou travado<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-logs-essenciais\">Logs essenciais<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nginx: <code>\/var\/log\/nginx\/error.log<\/code><\/li>\n\n\n\n<li>Apache: <code>\/var\/log\/apache2\/error.log<\/code><\/li>\n\n\n\n<li>PHP-FPM: <code>error.log<\/code> e <code>slow.log<\/code><\/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-php-fpm-lento-ou-travando\">PHP-FPM lento ou travando<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pontos-criticos\">Pontos cr\u00edticos<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>pm.max_children<\/code> atingido<\/li>\n\n\n\n<li>Processos presos por requisi\u00e7\u00f5es longas<\/li>\n\n\n\n<li>Depend\u00eancia externa lenta (API, banco, filesystem)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-comandos-uteis\">Comandos \u00fateis<\/h3>\n\n\n\n<p>ps-ylC php-fpm &#8211;sort:rss<\/p>\n\n\n\n<p>Ativar <code>slowlog<\/code> ajuda a identificar scripts problem\u00e1ticos.<\/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-banco-de-dados-lento-mysql-mariadb\">Banco de dados lento (MySQL \/ MariaDB)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-sintomas\">Sintomas<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Site responde, mas carrega lentamente<\/li>\n\n\n\n<li>CPU aparentemente ociosa<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-checklist\">Checklist<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>SHOW PROCESSLIST;<\/code><\/li>\n\n\n\n<li>Queries em estado <code>Locked<\/code> ou <code>Sending data<\/code><\/li>\n\n\n\n<li><code>SHOW ENGINE INNODB STATUS\\G<\/code><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-sistema\">Sistema<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Swap ativa durante carga<\/li>\n\n\n\n<li>Gargalo de I\/O identificado via <code>iostat<\/code><\/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-disco-cheio-ou-espaco-desaparecendo\">Disco cheio ou espa\u00e7o desaparecendo<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-verificacoes\">Verifica\u00e7\u00f5es<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>df -h<\/code><\/li>\n\n\n\n<li><code>df -i<\/code> (inodes)<\/li>\n\n\n\n<li>Identificar maiores diret\u00f3rios:du -xh \/ | sort-h | tail<\/li>\n<\/ul>\n\n\n\n<p>Causas comuns incluem logs sem rota\u00e7\u00e3o e backups acumulados.<\/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-inodes-esgotados\">Inodes esgotados<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-sintoma-classico\">Sintoma cl\u00e1ssico<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Espa\u00e7o livre dispon\u00edvel<\/li>\n\n\n\n<li>Erros ao criar arquivos<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-diagnostico\">Diagn\u00f3stico<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>df -i<\/code><\/li>\n\n\n\n<li>Diret\u00f3rios com milh\u00f5es de arquivos pequenos<\/li>\n\n\n\n<li>Sess\u00f5es PHP, uploads ou maildirs<\/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-problemas-de-rede-ou-conexoes-caindo\">Problemas de rede ou conex\u00f5es caindo<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-checklist-0\">Checklist<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>ss -s<\/code> \u2192 sockets ativos<\/li>\n\n\n\n<li>Muitos <code>TIME_WAIT<\/code>?<\/li>\n\n\n\n<li>Firewall bloqueando conex\u00f5es<\/li>\n\n\n\n<li>Interface de rede:ip -s link<\/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-oom-killer-finalizando-processos\">OOM Killer finalizando processos<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-confirmacao\">Confirma\u00e7\u00e3o<\/h3>\n\n\n\n<p>dmesg | grep-i oom<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-analise\">An\u00e1lise<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Qual processo foi morto?<\/li>\n\n\n\n<li>Swap insuficiente?<\/li>\n\n\n\n<li>Limites de mem\u00f3ria mal configurados (cgroups, systemd)<\/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-servidor-cai-sob-pico-de-trafego\">Servidor cai sob pico de tr\u00e1fego<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pontos-comuns\">Pontos comuns<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Limite baixo de arquivos abertos (<code>ulimit -n<\/code>)<\/li>\n\n\n\n<li><code>fs.file-max<\/code> insuficiente<\/li>\n\n\n\n<li>PHP-FPM ou banco saturados<\/li>\n\n\n\n<li>Cache inexistente ou mal configurado<\/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-boas-praticas-de-diagnostico\">Boas pr\u00e1ticas de diagn\u00f3stico<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nunca reinicie sem coletar dados<\/li>\n\n\n\n<li>M\u00e9trica antes de a\u00e7\u00e3o<\/li>\n\n\n\n<li>Logs s\u00e3o provas, n\u00e3o opini\u00e3o<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Sintoma n\u00e3o \u00e9 causa. Diagn\u00f3stico estruturado evita retrabalho.<\/strong><\/p>\n<\/blockquote>\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>Um checklist de diagn\u00f3stico por sintoma transforma incidentes ca\u00f3ticos em processos previs\u00edveis. Com dados corretos, decis\u00f5es se tornam t\u00e9cnicas \u2014 n\u00e3o emocionais.<\/p>\n\n\n\n<p>Esse m\u00e9todo \u00e9 essencial para opera\u00e7\u00f5es profissionais, especialmente em ambientes com <strong>WordPress, Nginx, PHP-FPM, MariaDB e alta concorr\u00eancia<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Diagn\u00f3stico por sintoma em servidores Linux. Em ambientes de produ\u00e7\u00e3o, o sintoma quase nunca aponta diretamente para a causa real do problema. [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4216,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4187],"tags":[],"class_list":["post-3187","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monitoramento-e-troubleshooting"],"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>Checklist de Diagn\u00f3stico por Sintoma em Servidores Linux<\/title>\n<meta name=\"description\" content=\"Checklist t\u00e9cnico para diagnosticar falhas em servidores Linux por sintoma. 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