{"id":7179,"date":"2026-06-15T02:31:00","date_gmt":"2026-06-15T05:31:00","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=7179"},"modified":"2026-06-15T02:41:48","modified_gmt":"2026-06-15T05:41:48","slug":"mistakes-that-every-beginner-sysadmin-makes","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/en\/mistakes-that-every-beginner-sysadmin-makes\/","title":{"rendered":"Mistakes every beginner sysadmin makes"},"content":{"rendered":"<div id=\"helps-277003528\" 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 id=\"h-1-the-backup-of-schrodinger\" class=\"wp-block-heading\">1. The &#8220;Backup of Schr\u00f6dinger&#8221;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The mistake isn&#8217;t forgetting to back up your data (although that happens), but rather blindly trusting that it works.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Mistake:<\/strong> Setting up backups and never testing the restore.<\/li>\n\n\n\n<li><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.<\/li>\n\n\n\n<li><strong>The Solution:<\/strong> Implement the 3-2-1 strategy and schedule monthly restore tests.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-2-the-silver-bullet-of-the-chmod-777\" class=\"wp-block-heading\">2. The &#8220;Silver Bullet&#8221; of the chmod 777<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When something doesn&#8217;t work because of permission, the beginner panics and &#8220;opens the doors.&#8221;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Error:<\/strong> Running <code>chmod -R 777 \/var\/www\/html<\/code> to resolve a &#8220;Permission Denied&#8221; error.<\/li>\n\n\n\n<li><strong>The Danger:<\/strong> You have just allowed any malicious user or script on the system to read, edit, and execute files.<\/li>\n\n\n\n<li><strong>The Solution:<\/strong> Understand how owners (chown) and groups work. Grant only the minimum necessary permissions (Principle of Least Privilege).<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-3-the-addiction-to-the-root\" class=\"wp-block-heading\">3. The addiction to the root<\/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<ul class=\"wp-block-list\">\n<li><strong>The Mistake:<\/strong> Logging in via SSH directly as root or using the root user for everyday tasks.<\/li>\n\n\n\n<li><strong>The Danger:<\/strong> A wrong command (such as 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.<\/li>\n\n\n\n<li><strong>The Solution:<\/strong> Disable root login via SSH. Use <code>sudo<\/code> for temporary privilege elevation.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-4-i-ll-test-it-quickly-in-production\" class=\"wp-block-heading\">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<ul class=\"wp-block-list\">\n<li><strong>The Error:<\/strong> Editing configuration files (nginx.conf, my.cnf, php.ini) directly on the production server without testing beforehand, or deploying on a Friday afternoon.<\/li>\n\n\n\n<li><strong>The Consequence:<\/strong> The service fails to restart due to a syntax error, and the website goes down during peak hours.<\/li>\n\n\n\n<li><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.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-5-ignore-disk-space-and-logs\" class=\"wp-block-heading\">5. Ignore Disk Space and Logs<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Full disks are a silent cause of data corruption.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Error:<\/strong> Not monitoring the growth of log files or not configuring logrotate.<\/li>\n\n\n\n<li><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.<\/li>\n\n\n\n<li><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.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-6-disable-security-because-it-gets-in-the-way\" class=\"wp-block-heading\">6. Disable Security because it &#8220;gets in the way&#8221;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Beginner sysadmins often view security tools as obstacles, not allies.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>The Mistake:<\/strong> Disabling the firewall (iptables -F \/ ufw disable) the first time a connection is blocked, and forgetting to re-enable it.<\/li>\n\n\n\n<li><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.<\/li>\n<\/ul>\n\n\n\n<h3 id=\"h-7-mental-documentation\" class=\"wp-block-heading\">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 port.&#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 id=\"h-survival-summary\" class=\"wp-block-heading\">Survival Summary<\/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 disk will eventually fill up.&#8221;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/en\/\" target=\"_blank\" rel=\"noreferrer noopener\">Click here to view our Server Management plans.<\/a><\/strong><\/p>\n\n\n\n<h3 id=\"h-faq\" class=\"wp-block-heading\">FAQ<\/h3>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1781501737547\"><strong class=\"schema-faq-question\">Why is an untested backup considered a mistake?<\/strong> <p class=\"schema-faq-answer\">A backup only truly exists if it can be successfully restored. Many beginners schedule automated backups but never test the recovery process, only to discover during a crisis that the backup files are empty, corrupted, or completely unusable.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1781501771299\"><strong class=\"schema-faq-question\">What is the danger of using <code>chmod 777<\/code> to fix permission errors?<\/strong> <p class=\"schema-faq-answer\">Running <code>chmod -R 777<\/code> grants full read, write, and execute permissions to <em>everyone<\/em> on the system. This opens up massive security vulnerabilities, allowing any local user, malicious script, or attacker to modify or destroy critical system files.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1781501788938\"><strong class=\"schema-faq-question\">Why should I avoid logging in or working directly as the root user?<\/strong> <p class=\"schema-faq-answer\">Working continuously as the root user leaves zero room for error; a single misprotyped command like <code>rm -rf<\/code> can instantly wipe out the server. Additionally, using a shared root account destroys the audit trail, making it impossible to see which teammate made a specific change.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1781501810612\"><strong class=\"schema-faq-question\">What does the rule &#8220;Friday is read-only day&#8221; mean?<\/strong> <p class=\"schema-faq-answer\">It means you should never deploy major updates, change critical configurations, or push modifications to a production server on a Friday afternoon. If something goes wrong, you risk ruining your weekend (and your team&#8217;s) dealing with emergency downtime.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1781501835626\"><strong class=\"schema-faq-question\">How does a full disk cause database corruption?<\/strong> <p class=\"schema-faq-answer\">When a server&#8217;s disk space hits 100% capacity due to unmanaged logs or temporary files, the database engine will try to write data and fail mid-transaction. This abrupt failure often corrupts the database tables and can crash the entire operating system.<\/p> <\/div> <\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><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<\/strong><\/a><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/cheap-vps-6-critical-mistakes\/\">Cheap VPS: 6 Critical Mistakes You Should Avoid When Hiring<\/a><\/strong><br><strong><a href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/how-to-use-htop-iotop-and-glances\/\">How to Use htop, iotop, and Glances for Quick Diagnostics of Linux Servers<\/a><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><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>Complete Guide to DirectAdmin for Administrators: Installation, Security, and 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><a href=\"https:\/\/helpsysadmin.com.br\/blog\/en\/why-migrate-reseller-hosting-to-a-vps-or-dedicated-server\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><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":7181,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4456],"tags":[4644,4642,4640,4653,4638,4641,4655,4643,4637,4639],"class_list":["post-7179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infrastructure-and-cloud-computing","tag-backupstrategy","tag-beginnersysadmin","tag-devops","tag-itinfrastructure","tag-linuxadministration","tag-linuxsecurity","tag-servermanagement","tag-serversecurity","tag-sysadmintips","tag-systemadministration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.8 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Mistakes every beginner sysadmin makes<\/title>\n<meta name=\"description\" content=\"Aqui est\u00e3o os erros mais 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