{"id":46985,"date":"2024-07-24T08:09:37","date_gmt":"2024-07-24T08:09:37","guid":{"rendered":"https:\/\/accuweb.cloud\/resource\/?post_type=faq&#038;p=46985"},"modified":"2026-02-18T07:35:01","modified_gmt":"2026-02-18T07:35:01","slug":"mongodb-auto-clustering-2","status":"publish","type":"faq","link":"https:\/\/accuweb.cloud\/resource\/articles\/mongodb-auto-clustering-2","title":{"rendered":"MongoDB Replica Set Auto-Clustering"},"content":{"rendered":"<h2 class=\"ack-h2\">MongoDB Replica Set Auto-Clustering for High Availability and Performance on AccuWeb.Cloud<\/h2>\n<p>Setting up MongoDB <a class=\"ack-link-color\" href=\"https:\/\/docs.mongodb.com\/manual\/replication\/\" target=\"_blank\" rel=\"noopener\">replica sets<\/a> for high availability and performance can be streamlined using AccuWeb.Cloud. Follow these steps to configure your MongoDB environment<\/p>\n<h2 class=\"ack-h2\">Key Features of MongoDB Replica Set on AccuWeb Cloud<\/h2>\n<h3 class=\"ack-h3\">Redundancy and Data High Availability<\/h3>\n<p>Maintaining multiple copies of data across different database servers ensures a high level of fault tolerance against data loss. This setup guarantees that your data remains accessible even if one or more servers fail.<\/p>\n<h3 class=\"ack-h3\">Scalability and Auto-Discovery<\/h3>\n<p>When new nodes are added during <a class=\"ack-link-color\" href=\"https:\/\/accuweb.cloud\/resource\/articles\/how-to-automatically-scale-nodes-horizontally-in-accuweb-cloud\/\" target=\"_blank\" rel=\"noopener\">horizontal scaling,<\/a> they are automatically integrated into the cluster with all necessary configurations applied. This seamless auto-discovery process allows the cluster to expand without manual intervention.<\/p>\n<h3 class=\"ack-h3\">Automated Failover<\/h3>\n<p>In the event of temporary unavailability or high latency of any database node, the system automatically excludes the affected node from the cluster. Once the connection is restored, the node is reintegrated into the cluster, ensuring continuous and efficient operation.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Automated-Failover-1.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-46986 size-full\" title=\"Automated Failover\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Automated-Failover-1.jpg\" alt=\"Automated Failover\" width=\"900\" height=\"507\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Automated-Failover-1.jpg 900w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Automated-Failover-1-300x169.jpg 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Automated-Failover-1-768x433.jpg 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/a><\/p>\n<p>All these benefits can be easily activated in just a few clicks using the topology wizard. Follow these steps to enable auto-clustering for your MongoDB database on AccuWeb.Cloud PaaS:<\/p>\n<h3 class=\"ack-h3\">Specifics of the MongoDB Auto-Clustering<\/h3>\n<p>A <a class=\"ack-link-color\" href=\"https:\/\/www.mongodb.com\/docs\/manual\/replication\/\" target=\"_blank\" rel=\"noopener\">replica set<\/a> in MongoDB consists of a minimum of three instances that synchronize data. One instance acts as the primary node, handling all write operations and recording changes in the oplog. The secondary nodes use this oplog to replicate the primary&#8217;s data. If the primary node goes offline, one of the secondary nodes is automatically promoted to primary after a brief period.<\/p>\n<p>The default configuration <a class=\"ack-link-color\" href=\"https:\/\/www.mongodb.com\/docs\/manual\/reference\/replica-configuration\/#settings\" target=\"_blank\" rel=\"noopener\">setting<\/a>s for the automatically configured cluster are as follows:<\/p>\n<ul class=\"ack-ul\">\n<li><strong>&#8220;chainingAllowed&#8221;:<\/strong> true &#8211; Enables secondary members to replicate data from other secondaries.<\/li>\n<li><strong>&#8220;heartbeatIntervalMillis&#8221;:<\/strong> 2000 &#8211; Sets the frequency of heartbeats to 2000 milliseconds.<\/li>\n<li><strong>&#8220;heartbeatTimeoutSecs&#8221;:<\/strong> 10 &#8211; Specifies a 10-second timeout for replica set members to wait for a successful heartbeat before marking a node as inaccessible.<\/li>\n<li><strong>&#8220;electionTimeoutMillis&#8221;:<\/strong> 10000 &#8211; Sets a 10,000-millisecond timeout for detecting if the primary member is unreachable.<\/li>\n<li><strong>&#8220;catchUpTimeoutMillis&#8221;:<\/strong> -1 &#8211; Indicates an infinite timeout for the newly elected primary to catch up with members that have more recent writes.<\/li>\n<li><strong>&#8220;catchUpTakeoverDelayMillis&#8221;:<\/strong> 30000 &#8211; Provides a 30,000-millisecond delay for a secondary node, which is ahead of the current primary, to allow for catch-up before initiating an election to become the new primary.<\/li>\n<\/ul>\n<p>Ensuring<br \/>\nsecurity and protection from unauthorized access is crucial. Authentication is a key security measure, requiring each replica set member to authenticate itself during internal communications using a unique authentication key file. During cluster configuration, the platform automatically:<\/p>\n<ul class=\"ack-ul\">\n<li>Applies necessary configurations in \/etc\/mongod.conf<\/li>\n<li>Generates an authentication key located at \/home\/jelastic\/mongodb.key<\/li>\n<\/ul>\n<p>To maintain consistency, this key file is also included in the redeploy.conf file, ensuring its persistence throughout all container lifecycle operations.<\/p>\n<h3 class=\"ack-h3\">Performance with WiredTiger Storage Engine<\/h3>\n<p>MongoDB defaults to the <a class=\"ack-link-color\" href=\"https:\/\/www.mongodb.com\/docs\/manual\/core\/wiredtiger\/\" target=\"_blank\" rel=\"noopener\">WiredTiger<\/a> storage engine, which offers high performance through non-locking algorithms and efficient cost\/resource utilization. The default WiredTiger options are optimized for running a single mongod instance per server, making them suitable for AccuWeb.Cloud PaaS containers. MongoDB leverages both the WiredTiger internal cache and the filesystem cache:<\/p>\n<ul class=\"ack-ul\">\n<li><strong>Internal Cache Size:<\/strong> Set to 50% of total RAM minus 1 GB, with a minimum of 256 MB.<\/li>\n<li><strong>Filesystem Cache:<\/strong> Uses the free memory not occupied by WiredTiger or other processes.<\/li>\n<\/ul>\n<p>For detailed information on WiredTiger configurations, refer to the official MongoDB documentation.<\/p>\n<h3 class=\"ack-h3\">Automated Node Management<\/h3>\n<p>A distinctive feature of the MongoDB auto-cluster is its ability to automatically detect and manage nodes during scaling operations. When new nodes are added through horizontal scaling, they are seamlessly included in the replica set without manual intervention. Similarly, nodes are automatically removed from the cluster during scaling in.<\/p>\n<h3 class=\"ack-h3\">Activate Auto-Clustering for Databases<\/h3>\n<p>The entire MongoDB auto-clustering process can be accomplished with a single click.<\/p>\n<p><strong>Step1.<\/strong> Click the <strong>&#8220;New Environment&#8221;<\/strong> button at the top-left corner of the dashboard to open the topology wizard. Select the <strong>MongoDB<\/strong> database option and enable <strong>Auto-Clustering<\/strong> using the designated switch<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Activate-Auto-Clustering.jpg\"><img decoding=\"async\" class=\"ack-article-image aligncenter wp-image-46987 size-full\" title=\"Activate Auto-Clustering\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Activate-Auto-Clustering.jpg\" alt=\"Activate Auto-Clustering\" width=\"977\" height=\"602\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Activate-Auto-Clustering.jpg 977w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Activate-Auto-Clustering-300x185.jpg 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Activate-Auto-Clustering-768x473.jpg 768w\" sizes=\"(max-width: 977px) 100vw, 977px\" \/><\/a><\/p>\n<p><strong>Step 2.<\/strong> Allow the platform a minute to automatically configure the cluster for you.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Configured-Cluster.png\"><img decoding=\"async\" class=\"ack-article-image aligncenter wp-image-46988 size-full\" title=\"Configured Cluster\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Configured-Cluster.png\" alt=\"Configured Cluster\" width=\"757\" height=\"283\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Configured-Cluster.png 757w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Configured-Cluster-300x112.png 300w\" sizes=\"(max-width: 757px) 100vw, 757px\" \/><\/a><\/p>\n<p><strong>Step 3.<\/strong> Once the installation is complete, you will receive an email confirming the successful configuration of the replica set.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Admin-Credentials-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-46989 size-full\" title=\"Configured Cluster\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Admin-Credentials-1.png\" alt=\"Configured Cluster\" width=\"965\" height=\"438\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Admin-Credentials-1.png 965w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Admin-Credentials-1-300x136.png 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Admin-Credentials-1-768x349.png 768w\" sizes=\"(max-width: 965px) 100vw, 965px\" \/><\/a><\/p>\n<p>You can use these credentials to access the admin panel or to establish connections from your applications directly to the primary node of the replica set.<\/p>\n<p><strong>Step 4.<\/strong> The auto-cluster utilizes the Mongo Express administration panel by default, offering support for managing replica sets.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mongo-Express-.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-46990 size-full\" title=\" Mongo Express\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mongo-Express-.png\" alt=\" Mongo Express\" width=\"1251\" height=\"588\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mongo-Express-.png 1251w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mongo-Express--300x141.png 300w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mongo-Express--1024x481.png 1024w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Mongo-Express--768x361.png 768w\" sizes=\"(max-width: 1251px) 100vw, 1251px\" \/><\/a><\/p>\n<p><strong>Step 5.<\/strong> Additionally, you have the option to connect to your database directly via the mongo shell in your terminal, such as through the integrated Web SSH feature.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Connect-Database-.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-46991 size-full\" title=\"Connect Database \" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Connect-Database-.png\" alt=\"Connect Database \" width=\"761\" height=\"373\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Connect-Database-.png 761w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Connect-Database--300x147.png 300w\" sizes=\"(max-width: 761px) 100vw, 761px\" \/><\/a><\/p>\n<div class=\"article-space\"><\/div>\n<pre><code class=\"language-javascript\">\r\nmongo -u {user} -p {password} {B_name}<\/code><\/pre>\n<div class=\"article-space\"><\/div>\n<p><strong>Step 6.<\/strong> You can verify the status of the replica set using the appropriate command<\/p>\n<div class=\"article-space\"><\/div>\n<pre><code class=\"language-javascript\">\r\nrs.status()<\/code><\/pre>\n<div class=\"article-extra-space\"><\/div>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Verify-the-Status.png\"><img loading=\"lazy\" decoding=\"async\" class=\"ack-article-image aligncenter wp-image-46992 size-full\" title=\"status\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Verify-the-Status.png\" alt=\"status\" width=\"524\" height=\"233\" srcset=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Verify-the-Status.png 524w, https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/Verify-the-Status-300x133.png 300w\" sizes=\"(max-width: 524px) 100vw, 524px\" \/><\/a><\/p>\n<p>As observed, the replica set (named <strong>rs0<\/strong> by default) is operational. For further replica set operations, refer to the official documentation. For instance, to view replica set configurations, you can use the <strong>rs.conf()<\/strong> command.<\/p>\n<div class=\"cta-btn-top-space ack-extra-image-space\">\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\" data-element_type=\"column\">\n        <div class=\"elementor-widget-wrap elementor-element-populated\">\n                    \n        \t\t<div class=\"elementor-element elementor-element-e31b40f elementor-widget elementor-widget-shortcode\" data-id=\"e31b40f\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t            <\/div>\n        <\/div>\n                    <\/div>\n        <\/section>\n        \t\t<\/div>\n\t\t<\/div>\n<div 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-46985","faq","type-faq","status-publish","has-post-thumbnail","hentry","faq_topics-databases","faq_topics-kb","faq_topics-mongodb","faq_topics-mongodb-auto-clustering","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>MongoDB Replica Set Auto-Clustering on AccuWeb.Cloud<\/title>\n<meta name=\"description\" content=\"Discover how AccuWeb.Cloud simplifies MongoDB replica set setup for high availability and performance. 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