{"id":194,"date":"2026-05-31T23:22:45","date_gmt":"2026-06-01T06:22:45","guid":{"rendered":"https:\/\/hostandtech.com\/kb\/whm\/how-to-configure-mysql-in-whm\/"},"modified":"2026-05-31T23:22:45","modified_gmt":"2026-06-01T06:22:45","slug":"how-to-configure-mysql-in-whm","status":"publish","type":"post","link":"https:\/\/hostandtech.com\/kb\/whm\/how-to-configure-mysql-in-whm\/","title":{"rendered":"How to Configure MySQL in WHM: Database Server Settings, Security, and Optimization"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>WHM (Web Host Manager) provides a centralized interface for managing your server&#8217;s MySQL or MariaDB database server \u2014 including version selection, configuration tuning, user management, and security hardening. Whether you&#8217;re setting up a fresh VPS or tightening security on an existing server, knowing where these controls live and what they actually do saves a lot of time.<\/p>\n<p>Most hosting admins encounter WHM MySQL settings when they&#8217;re either spinning up a new server, troubleshooting slow query performance, or responding to a security audit. The default configuration that ships with cPanel\/WHM is functional, but it&#8217;s not hardened and it&#8217;s not optimized for production workloads. You&#8217;ll need to make deliberate choices here.<\/p>\n<p>This article covers the essential WHM MySQL configuration steps, including version management, my.cnf tuning, root account security, and the gotchas that aren&#8217;t obvious from the UI alone. If you&#8217;re running reseller hosting and managing databases on behalf of clients, these settings affect every account on your server \u2014 so it&#8217;s worth getting them right from the start.<\/p>\n<h2>Prerequisites<\/h2>\n<ul>\n<li>Root access to WHM (typically via <code class=\"\" data-line=\"\">https:\/\/yourserver.com:2087<\/code>)<\/li>\n<li>A cPanel\/WHM installation (version 110 or later recommended; steps are consistent across recent releases as of 2026)<\/li>\n<li>SSH access to the server for command-line steps<\/li>\n<li>Basic familiarity with what a database server does (you don&#8217;t need to be a DBA)<\/li>\n<li>A backup of any existing databases before making configuration changes \u2014 especially before upgrading MySQL\/MariaDB versions<\/li>\n<\/ul>\n<h2>Step-by-Step Instructions<\/h2>\n<h3>Step 1: Access MySQL\/MariaDB Manager in WHM<\/h3>\n<p>Log into WHM as root. In the left-hand search bar, type <strong>MySQL<\/strong>. You&#8217;ll see several relevant options \u2014 the one you want first is <strong>MySQL\/MariaDB Manager<\/strong> under the <em>SQL Services<\/em> section.<\/p>\n<p>This panel shows your currently installed database engine and version, and lets you switch between MySQL and MariaDB releases. On most cPanel servers today, MariaDB 10.6 or 10.11 is the default. MySQL 8.0 is also supported if you need it for a specific application.<\/p>\n<p>\ud83d\udcdd Note: MariaDB and MySQL are largely compatible but not identical. Some MySQL 8.0 features (like specific JSON functions or certain authentication plugins) behave differently under MariaDB. If your application explicitly requires MySQL 8.0, select it here \u2014 otherwise, MariaDB 10.6+ is a solid default.<\/p>\n<h3>Step 2: Install or Upgrade Your Database Version<\/h3>\n<p>In the MySQL\/MariaDB Manager, you&#8217;ll see a list of available versions. To install or upgrade:<\/p>\n<ol>\n<li>Select your target version from the dropdown.<\/li>\n<li>Click <strong>Install<\/strong> (or <strong>Upgrade<\/strong> if you&#8217;re moving to a newer release).<\/li>\n<li>WHM will run the upgrade process, which includes a <code class=\"\" data-line=\"\">mysql_upgrade<\/code> equivalent automatically. This can take several minutes.<\/li>\n<\/ol>\n<p>\u26a0 Warning: Upgrading from MariaDB 10.5 to 10.11 (or MySQL 5.7 to 8.0) is not always reversible cleanly. Take a full server backup \u2014 or at minimum a <code class=\"\" data-line=\"\">mysqldump<\/code> of all databases \u2014 before proceeding.<\/p>\n<h3>Step 3: Edit the MySQL Configuration File (my.cnf)<\/h3>\n<p>WHM provides a GUI editor for <code class=\"\" data-line=\"\">\/etc\/my.cnf<\/code> under <strong>SQL Services &gt; MySQL Configuration Editor<\/strong>. This is where you tune performance-related settings.<\/p>\n<p>For a typical VPS with 4GB RAM running mixed WordPress and application workloads, here&#8217;s a reasonable baseline for the <code class=\"\" data-line=\"\">[mysqld]<\/code> section:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-1\"><code class=\"\" data-line=\"\">[mysqld]\ninnodb_buffer_pool_size = 1G\ninnodb_log_file_size = 256M\nmax_connections = 150\nquery_cache_type = 0\nquery_cache_size = 0\nslow_query_log = 1\nslow_query_log_file = \/var\/lib\/mysql\/slow.log\nlong_query_time = 2\ncharacter-set-server = utf8mb4\ncollation-server = utf8mb4_unicode_ci<\/code><\/pre>\n<\/div>\n<p>A few things worth explaining here:<\/p>\n<ul>\n<li><strong>innodb_buffer_pool_size<\/strong>: Set this to roughly 50-70% of available RAM on a dedicated database server. On a shared VPS, be conservative \u2014 over-allocating here starves other processes.<\/li>\n<li><strong>query_cache_type = 0<\/strong>: The query cache is disabled in MySQL 8.0 and causes contention in MariaDB under concurrent load. Disable it explicitly \u2014 many default configs still have it enabled.<\/li>\n<li><strong>slow_query_log<\/strong>: Turn this on. You&#8217;ll thank yourself later when a poorly indexed query starts hammering your server at 2am.<\/li>\n<li><strong>utf8mb4<\/strong>: Use this instead of <code class=\"\" data-line=\"\">utf8<\/code>. MySQL&#8217;s <code class=\"\" data-line=\"\">utf8<\/code> is actually a 3-byte subset and doesn&#8217;t handle emoji or certain Unicode characters correctly. <code class=\"\" data-line=\"\">utf8mb4<\/code> is the real thing.<\/li>\n<\/ul>\n<p>After saving changes in the GUI editor, restart MySQL via WHM under <strong>Restart Services &gt; SQL Server (MySQL)<\/strong> or via SSH:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-2\"><code class=\"\" data-line=\"\">systemctl restart mysql<\/code><\/pre>\n<\/div>\n<h3>Step 4: Secure the MySQL Root Account<\/h3>\n<p>This is the step most people skip, and it&#8217;s the one that matters most for security.<\/p>\n<p>On many Linux distributions (especially those using systemd), MySQL\/MariaDB configures root to authenticate via the <code class=\"\" data-line=\"\">unix_socket<\/code> or <code class=\"\" data-line=\"\">auth_socket<\/code> plugin rather than a password. This means <code class=\"\" data-line=\"\">mysql_secure_installation<\/code> can fail or behave unexpectedly when it tries to set a root password \u2014 it&#8217;ll report success but the password won&#8217;t actually work for remote or application-level connections.<\/p>\n<p>Here&#8217;s the reliable approach. First, connect as root via socket auth:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-3\"><code class=\"\" data-line=\"\">sudo mysql<\/code><\/pre>\n<\/div>\n<p>Then, inside the MySQL shell, switch root to use native password authentication and set a strong password. Replace <code class=\"\" data-line=\"\">YourStrongPasswordHere<\/code> with something real \u2014 and do not leave this placeholder in production:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-4\"><code class=\"\" data-line=\"\">ALTER USER &#039;root&#039;@&#039;localhost&#039; IDENTIFIED WITH mysql_native_password BY &#039;YourStrongPasswordHere&#039;;\nFLUSH PRIVILEGES;\nEXIT;<\/code><\/pre>\n<\/div>\n<p>\ud83d\udcdd Note: On MariaDB 10.4+, the equivalent plugin name is <code class=\"\" data-line=\"\">mysql_native_password<\/code> \u2014 same as above. On MariaDB 11.x, check the plugin name with <code class=\"\" data-line=\"\">SELECT user, plugin FROM mysql.user;<\/code> first, as this is evolving.<\/p>\n<p>Now run the hardening script:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-5\"><code class=\"\" data-line=\"\">mysql_secure_installation<\/code><\/pre>\n<\/div>\n<p>Answer the prompts: keep the root password you just set, remove anonymous users, disallow remote root login, remove the test database, and reload privilege tables. All of these should be <strong>Yes<\/strong> on a production server.<\/p>\n<h3>Step 5: Manage MySQL Users and Databases via WHM<\/h3>\n<p>For day-to-day database management, WHM&#8217;s <strong>SQL Services<\/strong> section includes:<\/p>\n<ul>\n<li><strong>MySQL Root Password<\/strong>: Updates the root password and syncs it with cPanel&#8217;s stored credentials.<\/li>\n<li><strong>Additional MySQL Access Hosts<\/strong>: Controls which IP addresses can connect to MySQL remotely. Add specific IPs here if your application servers need external database access. Don&#8217;t open this to <code class=\"\" data-line=\"\">0.0.0.0<\/code> unless you have a very specific, firewall-protected reason.<\/li>\n<li><strong>Manage MySQL Profiles<\/strong>: Relevant if you&#8217;re connecting WHM to a remote MySQL server \u2014 common on larger dedicated server setups where the database tier is separated from the web tier.<\/li>\n<\/ul>\n<p>Individual cPanel users manage their own databases and users through their cPanel interface, under <strong>Databases &gt; MySQL Databases<\/strong>. As a WHM admin, you can view and manage all databases server-wide via <strong>phpMyAdmin<\/strong> under SQL Services.<\/p>\n<h2>Common Issues and Troubleshooting<\/h2>\n<h3>MySQL Won&#8217;t Start After Editing my.cnf<\/h3>\n<p>Usually a syntax error in the config file. Check the error log:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-6\"><code class=\"\" data-line=\"\">journalctl -xeu mysql --no-pager | tail -50<\/code><\/pre>\n<\/div>\n<p>Or check MariaDB&#8217;s log directly:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-7\"><code class=\"\" data-line=\"\">cat \/var\/log\/mariadb\/mariadb.log<\/code><\/pre>\n<\/div>\n<p>Look for lines starting with <code class=\"\" data-line=\"\">[ERROR]<\/code>. Nine times out of ten, it&#8217;s a typo, a missing equals sign, or a value that exceeds available memory. Fix the value in <code class=\"\" data-line=\"\">\/etc\/my.cnf<\/code> and restart.<\/p>\n<h3>mysql_secure_installation Fails with &#8220;Access Denied&#8221;<\/h3>\n<p>This is annoyingly common and the official docs aren&#8217;t great on it. It means root is using socket authentication (see Step 4 above). The fix is to switch root to <code class=\"\" data-line=\"\">mysql_native_password<\/code> first using <code class=\"\" data-line=\"\">sudo mysql<\/code>, then rerun the hardening script. Follow the exact sequence in Step 4.<\/p>\n<h3>Too Many Connections Error<\/h3>\n<p>Applications return <code class=\"\" data-line=\"\">ERROR 1040: Too many connections<\/code>. This means you&#8217;ve hit the <code class=\"\" data-line=\"\">max_connections<\/code> limit in <code class=\"\" data-line=\"\">my.cnf<\/code>. You can check current usage without restarting:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-8\"><code class=\"\" data-line=\"\">SHOW STATUS LIKE &#039;Max_used_connections&#039;;\nSHOW VARIABLES LIKE &#039;max_connections&#039;;<\/code><\/pre>\n<\/div>\n<p>If <code class=\"\" data-line=\"\">Max_used_connections<\/code> is close to or equal to <code class=\"\" data-line=\"\">max_connections<\/code>, increase the limit in <code class=\"\" data-line=\"\">my.cnf<\/code>. But also check whether a connection leak in your application is the real cause \u2014 a WordPress site with a misconfigured persistent connection plugin can exhaust connections fast.<\/p>\n<h3>WHM Shows Wrong MySQL Version After Upgrade<\/h3>\n<p>The WHM interface sometimes caches the version display. Try a hard refresh, then check the actual running version via SSH:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-9\"><code class=\"\" data-line=\"\">mysql --version<\/code><\/pre>\n<\/div>\n<p>If the binary version doesn&#8217;t match what you selected in WHM&#8217;s MySQL Manager, the upgrade may have failed silently. Check <code class=\"\" data-line=\"\">\/usr\/local\/cpanel\/logs\/mysql_upgrade_mysql.log<\/code> for details.<\/p>\n<h3>Remote MySQL Connection Refused Despite Adding Access Host<\/h3>\n<p>Adding an access host in WHM is only half the job. You also need to make sure the MySQL bind address isn&#8217;t set to <code class=\"\" data-line=\"\">127.0.0.1<\/code> in <code class=\"\" data-line=\"\">\/etc\/my.cnf<\/code>:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-10\"><code class=\"\" data-line=\"\">grep bind-address \/etc\/my.cnf<\/code><\/pre>\n<\/div>\n<p>If it&#8217;s set to <code class=\"\" data-line=\"\">127.0.0.1<\/code>, change it to <code class=\"\" data-line=\"\">0.0.0.0<\/code> (or a specific interface IP) and restart MySQL. Then verify your server firewall (CSF or iptables) allows inbound connections on port 3306 from the remote IP.<\/p>\n<h2>Related Resources<\/h2>\n<p>If you&#8217;re managing databases across multiple client accounts, Host &amp; Tech&#8217;s <a href=\"https:\/\/www.hostandtech.com\/reseller-hosting\/\">Reseller Hosting<\/a> plans include WHM access with full MySQL management capabilities, so you can configure database settings server-wide while your clients manage individual databases through their own cPanel interfaces.<\/p>\n<div class=\"ht-faq-section\">\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">How do I reset the MySQL root password in WHM?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Go to WHM &gt; SQL Services &gt; MySQL Root Password and enter a new password. WHM updates the password and syncs it with its own stored credentials automatically. If MySQL won&#8217;t accept the new password through WHM, you may need to reset it via SSH using <code class=\"\" data-line=\"\">sudo mysql<\/code> and an ALTER USER statement as described in Step 4 of this guide.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Should I use MySQL or MariaDB on my cPanel server?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>For most hosting scenarios \u2014 WordPress, Joomla, Magento, general PHP apps \u2014 MariaDB 10.6 or 10.11 is the right choice. It&#8217;s actively maintained, performs well under concurrent load, and is fully compatible with standard MySQL queries. Only choose MySQL 8.0 if a specific application explicitly requires it, since some MySQL 8.0 authentication or JSON behaviours differ from MariaDB.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Can I connect to MySQL remotely on my WHM server?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Yes, but you need to do two things: add the remote IP under WHM &gt; SQL Services &gt; Additional MySQL Access Hosts, and make sure MySQL&#8217;s bind address in <code class=\"\" data-line=\"\">\/etc\/my.cnf<\/code> is not restricted to 127.0.0.1. You&#8217;ll also need port 3306 open in your server firewall for that specific IP. Leaving port 3306 open to all IPs is a security risk \u2014 always whitelist specific addresses.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">What&#039;s the difference between MySQL Manager and MySQL Configuration Editor in WHM?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>MySQL Manager handles version selection and installation \u2014 it&#8217;s where you switch between MariaDB and MySQL releases. MySQL Configuration Editor is a GUI for editing <code class=\"\" data-line=\"\">\/etc\/my.cnf<\/code>, the file that controls performance tuning, logging, and connection limits. They&#8217;re separate tools under the same SQL Services section in WHM.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">How do I find slow queries on my database server?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Enable the slow query log in <code class=\"\" data-line=\"\">\/etc\/my.cnf<\/code> by setting <code class=\"\" data-line=\"\">slow_query_log = 1<\/code> and <code class=\"\" data-line=\"\">long_query_time = 2<\/code> (logs queries taking over 2 seconds). The log file path is set with <code class=\"\" data-line=\"\">slow_query_log_file<\/code>. Once enabled, you can analyse the log with <code class=\"\" data-line=\"\">mysqldumpslow<\/code> or the <code class=\"\" data-line=\"\">pt-query-digest<\/code> tool from Percona Toolkit to identify problematic queries.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>WHM gives server admins direct control over MySQL and MariaDB configuration \u2014 but the options are spread across several panels and easy to misconfigure. This guide walks you through the key settings, how to harden your database server, and how to fix the errors that trip people up most.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[88],"tags":[72,466,471,468,467,469,470,465],"class_list":["post-194","post","type-post","status-publish","format-standard","hentry","category-whm","tag-cpanel-whm","tag-database-server","tag-how-to-configure-mysql-in-whm-database-server-settings-security-and-optimization","tag-mariadb-whm","tag-mysql-configuration","tag-mysql-security","tag-whm-database-management","tag-whm-mysql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Configure MySQL in WHM: Database Server Settings, Security, and Optimization<\/title>\n<meta name=\"description\" content=\"Learn how to configure MySQL in WHM, manage your database server settings, harden security, and fix common issues. 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