{"id":47391,"date":"2024-07-30T10:26:02","date_gmt":"2024-07-30T10:26:02","guid":{"rendered":"https:\/\/accuweb.cloud\/resource\/?post_type=faq&#038;p=47391"},"modified":"2026-02-18T07:22:59","modified_gmt":"2026-02-18T07:22:59","slug":"mariadb-galera-cluster-replication","status":"publish","type":"faq","link":"https:\/\/accuweb.cloud\/resource\/articles\/mariadb-galera-cluster-replication","title":{"rendered":"MariaDB Galera Cluster Replication on AccuWeb.Cloud"},"content":{"rendered":"<h2 class=\"ack-h2\">MariaDB Galera Cluster Replication on AccuWeb.Cloud<\/h2>\n<p>Extending the Topic of Database Auto-Clustering on AccuWeb.cloud: MariaDB Galera Cluster<br \/>\nAccuWeb.cloud offers a robust auto-clustering solution with MariaDB Galera Cluster, ensuring high availability and synchronous replication. Key features include:<\/p>\n<ol class=\"ack-ol\">\n<li><strong>True Multi-Master Topology:<\/strong> All nodes in the cluster are equal, allowing read and write operations on any node.<\/li>\n<li><strong>Automatic New Node Provisioning:<\/strong> New nodes are automatically added and synchronized without manual intervention, simplifying scalability.<\/li>\n<li><strong>No Data Loss on Node Crashes:<\/strong> The cluster ensures data integrity and availability, even in node failures.<\/li>\n<li><strong>Consistent Data Replicas:<\/strong> Data remains consistent across all nodes, thanks to synchronous replication.<\/li>\n<li><strong>Automatic Membership Control:<\/strong> Nodes are automatically managed within the cluster, ensuring seamless integration and operation.<\/li>\n<li><strong>No Complex Failovers:<\/strong> Failovers are handled automatically and transparently, avoiding the need for manual intervention and reducing downtime.<\/li>\n<li><strong>Parallel Transaction Execution:<\/strong> Transactions are executed in parallel across all nodes, enhancing performance and throughput.<\/li>\n<li><strong>No Slave Lag:<\/strong> Eliminates the delay between master and slave nodes, ensuring real-time data consistency.<\/li>\n<li><strong>No Lost Transactions:<\/strong> Ensures that no transactions are lost, providing reliable data integrity.<\/li>\n<li><strong>Scalability for Reads and Writes:<\/strong> The cluster can efficiently scale to handle increased read and write operations.<\/li>\n<li><strong>Smaller Client Latencies:<\/strong> Optimized for reduced latency, providing faster response times for clients.<\/li>\n<li><strong>Support for Multi-Cloud and Multi-Region Deployments:<\/strong> The cluster can be deployed across multiple clouds and regions, offering flexibility and resilience.<\/li>\n<\/ol>\n<p>By leveraging MariaDB Galera Cluster on AccuWeb.cloud, you achieve a high-performance, scalable, and resilient database environment, ensuring data consistency and availability across all nodes.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/galera-cluster-topology-12.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"ack-extra-image-space aligncenter wp-image-47396 size-full\" title=\"MariaDB Galera Cluster\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/galera-cluster-topology-12.jpg\" alt=\"MariaDB Galera Cluster\" width=\"500\" height=\"445\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/galera-cluster-topology-12.jpg 500w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/galera-cluster-topology-12-300x267.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<h2 class=\"ack-h2\">Requirements for Setting Up a Galera Cluster<\/h2>\n<p>In Galera, databases need to adhere to specific requirements when creating tables. Key requirements include:<\/p>\n<ul class=\"ack-ul\">\n<li><strong>InnoDB Storage Engine:<\/strong> All data must be stored using the <a class=\"ack-link-color\" target=\"_blank\" href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/innodb-storage-engine.html\" rel=\"noopener\">InnoDB<\/a> transactional storage engine to ensure proper replication.<\/li>\n<li><strong>Primary Keys:<\/strong> Each table intended for replication must have a defined primary key, which can be a single or multi-column index.<\/li>\n<\/ul>\n<p>For a comprehensive list of limitations and best practices, refer to the official <a class=\"ack-link-color\" target=\"_blank\" href=\"https:\/\/mariadb.com\/kb\/en\/mariadb-galera-cluster-known-limitations\/\" rel=\"noopener\">documentation.<\/a><\/p>\n<h2 class=\"ack-h2\">Setting Up MariaDB Galera Cluster on AccuWeb.cloud<\/h2>\n<ul class=\"ack-ul\">\n<li><strong>Access the AccuWeb.cloud Dashboard:<\/strong>\u00a0Sign in to your AccuWeb.cloud account and access the dashboard.<\/li>\n<li><strong>Create a New Environment:<\/strong> Click on &#8220;Create Environment&#8221; to start setting up your new environment.<\/li>\n<li><strong>Select MariaDB Server:<\/strong> Within the topology wizard, select MariaDB as your database server.<\/li>\n<li><strong>Activate Auto-Clustering:<\/strong> Enable the Auto-Clustering feature to set up a scalable and resilient database cluster.<\/li>\n<li><strong>Choose Galera Scheme:<\/strong> Select the Galera scheme to configure synchronous replication and high availability.<\/li>\n<\/ul>\n<h2 class=\"ack-h2\">Customizing Cluster Topology on AccuWeb.Cloud<\/h2>\n<p>Before proceeding with the installation, you have the option to exclude the ProxySQL layer from the cluster topology using the appropriate switch. Note that this decision is final; if you exclude ProxySQL before installation, you cannot add it later, and if you include it, you cannot remove it afterward.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/ProxySQL-settings.png\"><img decoding=\"async\" class=\"ack-extra-image-space aligncenter wp-image-47460 size-full\" title=\"ProxySQL settings\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/ProxySQL-settings.png\" alt=\"ProxySQL settings\" width=\"332\" height=\"358\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/ProxySQL-settings.png 332w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/ProxySQL-settings-278x300.png 278w\" sizes=\"(max-width: 332px) 100vw, 332px\" \/><\/a><\/p>\n<p>The environment will soon be created with the selected topology, complete with pre-configured interconnections, ready in just a few minutes.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Created-Environment-4.png\"><img decoding=\"async\" class=\"ack-article-image aligncenter wp-image-47461 size-full\" title=\"Created Environment\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Created-Environment-4.png\" alt=\"Created Environment\" width=\"689\" height=\"294\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Created-Environment-4.png 689w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Created-Environment-4-300x128.png 300w\" sizes=\"(max-width: 689px) 100vw, 689px\" \/><\/a><\/p>\n<p>You can monitor the health status of the cluster nodes through the Orchestrator admin panel. Access it using the credentials provided in the email regarding ProxySQL Load Balancer deployment. In the panel, each cluster member is displayed individually, showing their current status and health metrics.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Clusters-Current-Status-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-47463 size-full\" title=\"Cluster's Current Status\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Clusters-Current-Status-1.png\" alt=\"Cluster's Current Status\" width=\"896\" height=\"225\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Clusters-Current-Status-1.png 896w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Clusters-Current-Status-1-300x75.png 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Clusters-Current-Status-1-768x193.png 768w\" sizes=\"(max-width: 896px) 100vw, 896px\" \/><\/a><\/p>\n<h2 class=\"ack-h2\">Connecting a Java Web Application to MariaDB Galera Cluster via ProxySQL<\/h2>\n<p>Follow the linked guide for detailed instructions to establish a connection from your Java web application to the MariaDB Galera Cluster using ProxySQL as the entry point.<\/p>\n<p>Additionally, upon creating each master node in the MariaDB cluster, you will receive an email containing phpMyAdmin credentials. This allows you to access the databases through the phpMyAdmin panel, which is useful for debugging and performing manual operations on your databases.<\/p>\n<p><strong>Step 1.<\/strong> Access <a class=\"ack-link-color\" target=\"_blank\" href=\"https:\/\/www.phpmyadmin.net\/\" rel=\"noopener\">php<\/a>MyAdmin using the Admin Panel URL, Username, and Password provided in the email. Select the desired database (e.g., &#8216;test&#8217; or create a new one) from the left pane. Upon selection, the right pane will display that the database &#8216;test&#8217; (or your chosen database) currently has no tables.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-database-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-47464 size-full\" title=\"Test database\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-database-1.png\" alt=\"Test database\" width=\"1279\" height=\"230\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-database-1.png 1279w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-database-1-300x54.png 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-database-1-1024x184.png 1024w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-database-1-768x138.png 768w\" sizes=\"(max-width: 1279px) 100vw, 1279px\" \/><\/a><\/p>\n<p><strong>Step 2.<\/strong> Return to the AccuWeb.Cloud dashboard.<\/p>\n<p>In this example, we are using a separate environment with a Tomcat 9 application server. To configure the database for our test application, click on the Config icon next to your compute node.<\/p>\n<p>Navigate to the <strong>\/opt\/tomcat\/temp<\/strong> directory and create a file named mydb.cfg using the platform&#8217;s integrated file manager.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mydb.cfg-file.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-47465 size-full\" title=\"Mydb.cfg file\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mydb.cfg-file.png\" alt=\"Mydb.cfg file\" width=\"1177\" height=\"344\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mydb.cfg-file.png 1177w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mydb.cfg-file-300x88.png 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mydb.cfg-file-1024x299.png 1024w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mydb.cfg-file-768x224.png 768w\" sizes=\"(max-width: 1177px) 100vw, 1177px\" \/><\/a><\/p>\n<p>Download the test application from one of the provided links and deploy it on the Tomcat server.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Deploy-to-Tomcat-Server.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-extra-image-space aligncenter wp-image-47466 size-full\" title=\"Deploy to Tomcat Server\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Deploy-to-Tomcat-Server.png\" alt=\"Deploy to Tomcat Server\" width=\"435\" height=\"254\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Deploy-to-Tomcat-Server.png 435w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Deploy-to-Tomcat-Server-300x175.png 300w\" sizes=\"(max-width: 435px) 100vw, 435px\" \/><\/a><\/p>\n<p>For seamless compatibility with the proxy layer, ensure you use the latest JDBC connector for MariaDB. Place the connectors into the <strong>\/opt\/tomcat\/webapps\/ROOT\/WEB-INF\/lib\/<\/strong> directory.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Place-the-Connectors.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-47467 size-full\" title=\"Place the Connectors\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Place-the-Connectors.png\" alt=\"Place the Connectors\" width=\"1065\" height=\"280\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Place-the-Connectors.png 1065w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Place-the-Connectors-300x79.png 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Place-the-Connectors-1024x269.png 1024w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Place-the-Connectors-768x202.png 768w\" sizes=\"(max-width: 1065px) 100vw, 1065px\" \/><\/a><\/p>\n<p><strong>Step 3.<\/strong> Remember to restart your application server to apply the changes made in mydb.cfg. You can accomplish this action by selecting the <strong>&#8220;Restart Nodes&#8221;<\/strong> button.<\/p>\n<p><strong>Step 4.<\/strong> To create and use custom user accounts after installing the cluster, you must add them to the mysql_users table on each ProxySQL node. This step is crucial for establishing connections to the database via the proxy layer. Follow these commands:<\/p>\n<div class=\"article-space\"><\/div>\n<pre><code class=\"language-javascript\">\r\n$ MYSQL_PWD=admin mysql -h 162.0.0.1 -P6032 -uadmin -e \"INSERT INTO mysql_users (username,password,default_hostgroup) VALUES ('&lt;username&gt;', '&lt;password&gt;', 2);\"<\/code><\/pre>\n<div class=\"article-extra-space\"><\/div>\n<pre><code class=\"language-javascript\">\r\n$ MYSQL_PWD=admin mysql -h 145.0.0.1 -P6032 -uadmin -e <strong>\"LOAD MYSQL USERS TO RUNTIME; SAVE MYSQL USERS TO DISK;\"<\/strong><\/code><\/pre>\n<div class=\"article-space\"><\/div>\n<p>Replace &lt;username&gt; and &lt;password&gt; with the credentials of your newly created database account. This ensures the ProxySQL nodes recognize and authenticate these custom users correctly.<\/p>\n<p><strong>Step 5.<\/strong> After the deployment completes, click on <strong>&#8220;Open in Browser&#8221;<\/strong> either in a popup window or next to your application server. Then, within the application window, click on the button labeled <strong>&#8220;Create test table in your database&#8221;<\/strong> to proceed.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-Application-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-47468 size-full\" title=\"Test Application\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-Application-1.png\" alt=\"Test Application\" width=\"555\" height=\"203\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-Application-1.png 555w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Test-Application-1-300x110.png 300w\" sizes=\"(max-width: 555px) 100vw, 555px\" \/><\/a><\/p>\n<p><strong>Step 6.<\/strong> To verify that the connection was successfully established and a new table was created, navigate back to the MySQL admin panel.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MySQL-Admin-panel-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-47470 size-full\" title=\"MySQL Admin panel\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MySQL-Admin-panel-1.png\" alt=\"MySQL Admin panel\" width=\"1181\" height=\"477\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MySQL-Admin-panel-1.png 1181w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MySQL-Admin-panel-1-300x121.png 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MySQL-Admin-panel-1-1024x414.png 1024w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MySQL-Admin-panel-1-768x310.png 768w\" sizes=\"(max-width: 1181px) 100vw, 1181px\" \/><\/a><\/p>\n<p>Check for the table named with the {date-time of creation} to confirm that replication is functioning correctly. Review all database phpMyAdmin panels within the cluster using the same credentials to ensure data availability across all instances.<\/p>\n<div class=\"article-space\"><\/div>\n<div class=\"ack-formula\">\n<strong>Tip:<\/strong> In AccuWeb.Cloud, each <a class=\"ack-link-color\" target=\"_blank\" href=\"https:\/\/mariadb.org\/download\/?t=mariadb&amp;p=mariadb&amp;r=11.4.2&amp;os=Linux&amp;cpu=x86_64&amp;pkg=tar_gz&amp;i=systemd&amp;mirror=starburst_mumbai\" rel=\"noopener\">MariaDB <\/a>node comes with a built-in phpMyAdmin panel. Simply click the <strong>&#8220;Open in Browser&#8221;<\/strong> button on the database node&#8217;s line to access it.<\/div>\n<div class=\"article-space\"><\/div>\n<p>Awesome! You&#8217;ve quickly set up access to your DB cluster from a web application and managed operations seamlessly through a single entry point.<\/p>\n<p>Now you have a highly available and reliable MariaDB Galera Cluster installed automatically within minutes, complete with intuitive management tools out-of-the-box. Take advantage of AccuWeb.Cloud PaaS&#8217;s embedded database auto-clustering capabilities.<\/p>\n<div class=\"cta-btn-top-space ack-extra-image-space\">\n  \t\t<div data-elementor-type=\"section\" data-elementor-id=\"38668\" class=\"elementor elementor-38668\" data-elementor-settings=\"{&quot;ha_cmc_init_switcher&quot;:&quot;no&quot;}\" data-elementor-post-type=\"elementor_library\">\n\t\t\t        <section class=\"elementor-section elementor-top-section elementor-element elementor-element-882321f elementor-section-boxed elementor-section-height-default elementor-section-height-default ct-header-fixed-none ct-row-max-none\" data-id=\"882321f\" data-element_type=\"section\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n            \n                        <div class=\"elementor-container elementor-column-gap-default \">\n                    <div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7cc79cc\" data-id=\"7cc79cc\" 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class=\"cta-btn-bottom-space\"><\/div>\n","protected":false},"author":1,"featured_media":52879,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","class_list":["post-47391","faq","type-faq","status-publish","has-post-thumbnail","hentry","faq_topics-databases","faq_topics-kb","faq_topics-mariadb-galera-cluster","faq_topics-mysql-mariadb-percona","faq_topics-product-documentation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.10 (Yoast SEO v24.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MariaDB Galera Cluster Replication on AccuWeb.cloud<\/title>\n<meta name=\"description\" content=\"Replication with MariaDB Galera Cluster on AccuWeb.cloud, ensuring a robust auto-clustering solution for a scalable database environment.\" \/>\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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