{"id":2346,"date":"2026-01-03T01:45:59","date_gmt":"2026-01-03T04:45:59","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=2346"},"modified":"2026-01-03T01:50:02","modified_gmt":"2026-01-03T04:50:02","slug":"mistakes-every-beginner-sysadmin-makes","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/en\/mistakes-every-beginner-sysadmin-makes\/","title":{"rendered":"Mistakes every beginner sysadmin makes"},"content":{"rendered":"<div id=\"helps-6553296\" 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\">Systems administration is an area where experience often comes right after you need it. Every senior sysadmin has &#8220;war&#8221; stories about the day they deleted the wrong database or crashed the company network.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here are the most common mistakes that almost every beginner sysadmin makes, divided into critical categories.<\/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-1-the-schrodinger-s-backup\">1. The &#8220;Schr\u00f6dinger&#8217;s Backup&#8221;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The mistake isn&#8217;t forgetting to back up (although that happens), but rather blindly trusting that it works.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Mistake:<\/strong> Setting up backups and never testing the restore.<br><strong>The Reality:<\/strong> An untested backup doesn&#8217;t exist. You only discover that the .tar.gz file is corrupted or that the database dump was empty at the time of the disaster.<br><br><strong>The Solution:<\/strong> Implement the 3-2-1 strategy and schedule monthly restore tests.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-2-the-silver-bullet-of-chmod-777\">2. The &#8220;Silver Bullet&#8221; of chmod 777<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When something doesn&#8217;t work due to permissions, beginners panic and &#8220;open the doors.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Error:<\/strong> Running chmod -R 777 \/var\/www\/html to resolve a &#8220;Permission Denied&#8221; error.<br><strong>The Danger:<\/strong> You have just allowed any malicious user or script on the system to read, edit, and execute files.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Solution:<\/strong> Understand how owners (chown) and groups work. Grant only the minimum necessary permissions (Principle of Least Privilege).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-3-the-root-addiction\">3. The Root Addiction<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">It&#8217;s tempting to use the most powerful user for everything because &#8220;it works without complaining.&#8221;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Mistake:<\/strong> Logging in via SSH directly as root or using the root user for everyday tasks.<br><strong>The Danger:<\/strong> A wrong command (like a misdirected <code>rm -rf<\/code>) is catastrophic. Furthermore, there&#8217;s no audit trail of who made the change if everyone uses the same root account.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Solution:<\/strong> Disable root login via SSH. Use <code>sudo<\/code> for temporary privilege elevation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-4-i-ll-test-it-quickly-in-production\">4. &#8220;I&#8217;ll test it quickly in Production&#8221;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Overconfidence is the mother of downtime.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Mistake:<\/strong> Editing configuration files (nginx.conf, my.cnf, php.ini) directly on the production server without testing beforehand, or deploying on a Friday afternoon.<br><strong>The Consequence:<\/strong> The service fails to restart due to a syntax error, and the site goes down during peak hours.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Solution:<\/strong> Have a staging environment. If this is not possible, always use syntax testing commands (e.g., nginx -t, apachectl configtest) before restarting the service.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-5-ignore-disk-space-and-logs\">5. Ignore Disk Space and Logs<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Full disks are silent causes of data corruption.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Error:<\/strong> Not monitoring the growth of log files or not configuring logrotate.<br><strong>The Danger:<\/strong> The disk fills up (100% usage). The database attempts to write, fails, and corrupts tables. The system crashes because it cannot write temporary files.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Solution:<\/strong> Configure monitoring (Nagios, Zabbix (configure on a separate server), or simple bash scripts) and ensure that logrotate is active and compressing old logs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-6-disabling-security-because-it-gets-in-the-way\">6. Disabling Security Because It &#8220;Gets in the Way&#8221;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Beginner sysadmins often see security tools as obstacles, not allies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Mistake: <\/strong>Disabling the Firewall (iptables -F \/ ufw disable) the first time a connection is blocked, and forgetting to re-enable it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Solution:<\/strong> Learn how to configure the rules. There are tools like audit2allow that help create exceptions without disabling the entire SELinux protection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-7-mental-documentation\">7. Mental Documentation<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">&#8220;I&#8217;ll remember what this script does and why I changed this door.&#8221; (Narrator: He didn&#8217;t remember).<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Mistake:<\/strong> Not documenting changes, custom configurations, or service passwords.<\/li>\n\n\n\n<li><strong>The Consequence:<\/strong> Six months later, the server needs to be migrated and nobody knows how it was configured, or you go on vacation and your colleagues are left paralyzed.<\/li>\n\n\n\n<li><strong>The Solution:<\/strong> Maintain an internal Wiki, use comments in configuration files, and ideally, start studying Infrastructure as Code (Ansible, Terraform) so that the code becomes the documentation.<\/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-resumo-da-sobrevivencia\">Resumo da Sobreviv\u00eancia<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Common Mistake<\/strong><\/td><td><strong>Correction Mantra<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Untested backup<\/strong><\/td><td>&#8220;If it doesn&#8217;t restore, it&#8217;s not a backup.&#8221;<\/td><\/tr><tr><td><strong>Log in as Root<\/strong><\/td><td>&#8220;Sudo is your friend.&#8221;<\/td><\/tr><tr><td><strong>Edit in Production<\/strong><\/td><td>&#8220;Friday is read-only day.&#8221;<\/td><\/tr><tr><td><strong><code>chmod 777<\/code><\/strong><\/td><td>&#8220;Minimum permission required.&#8221;<\/td><\/tr><tr><td><strong>Ignore Logs<\/strong><\/td><td>&#8220;The record will sell out someday.&#8221;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong>Veja tamb\u00e9m:<\/strong><br><a href=\"https:\/\/helpsysadmin.com.br\/blog\/guia-completo-do-directadmin-para-administradores\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Guia Completo do DirectAdmin para Administradores | Instala\u00e7\u00e3o, Seguran\u00e7a e Performance<\/strong><\/a><br><a href=\"https:\/\/helpsysadmin.com.br\/blog\/testar-velocidade-da-internet-do-servidor-linux-com-speedtest-cli\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Como testar a velocidade da internet do servidor linux com speedtest-cli<\/strong><\/a><br><a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-verificar-no-linux-a-velocidade-de-io-do-disco\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Como verificar no linux a velocidade de I\/O do disco<\/strong><\/a><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/instalar-engintron-nginx-cpanel\/\" target=\"_blank\" rel=\"noreferrer noopener\">Como instalar Engintron(NGINX) cPanel\/WHM<\/a><br><\/strong><br><strong>In english:<br><\/strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/why-migrate-reseller-hosting-to-a-vps-or-dedicated-server\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Why Migrate Reseller Hosting to a VPS or Dedicated Server<br><\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Systems administration is an area where experience often comes right after you need it. Every senior sysadmin has &#8220;war&#8221; stories about the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2254,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1209,1204],"tags":[],"class_list":["post-2346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","category-server-management"],"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>Mistakes every beginner sysadmin makes<\/title>\n<meta name=\"description\" content=\"Here are the most common mistakes that almost every beginner sysadmin makes, divided into critical categories.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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