{"id":37971,"date":"2024-07-03T08:28:39","date_gmt":"2024-07-03T08:28:39","guid":{"rendered":"https:\/\/accuweb.cloud\/blog\/?p=37971"},"modified":"2026-01-22T08:13:27","modified_gmt":"2026-01-22T08:13:27","slug":"mongodb-replication-automated-failover","status":"publish","type":"post","link":"https:\/\/accuweb.cloud\/blog\/mongodb-replication-automated-failover\/","title":{"rendered":"MongoDB Replication and Automated Failover: Configuration Guide"},"content":{"rendered":"<h1 class=\"ac-h1\">MongoDB Replication and Automated Failover: Configuration Guide<\/h1>\n<p><a href=\"https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/MongoDB-Replication-and-Automated-Failover.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-41938 size-full\" title=\"MongoDB Replication and Automated Failover: Configuration Guide\" src=\"https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/MongoDB-Replication-and-Automated-Failover.png\" alt=\"MongoDB Replication and Automated Failover: Configuration Guide\" width=\"1280\" height=\"720\" srcset=\"https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/MongoDB-Replication-and-Automated-Failover.png 1280w, https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/MongoDB-Replication-and-Automated-Failover-300x169.png 300w, https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/MongoDB-Replication-and-Automated-Failover-1024x576.png 1024w, https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/MongoDB-Replication-and-Automated-Failover-768x432.png 768w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/a><\/p>\n<div class=\"tips_box-cloud gradient-cloud\">\n<h3 class=\"cb-h3\">TL;DR<\/h3>\n<ul class=\"cb-ul\">\n<li><strong>MongoDB replication<\/strong> uses replica sets to maintain identical copies of data across multiple servers for high availability.<\/li>\n<li><strong>Primary and secondary nodes<\/strong> ensure read\/write distribution; secondaries can take over if the primary fails.<\/li>\n<li><strong>Automated failover<\/strong> detects primary node failure and promotes a secondary node automatically, minimizing downtime.<\/li>\n<li>Replica sets use <strong>heartbeat protocols<\/strong> to monitor node health and trigger elections when needed.<\/li>\n<li>Replication improves <strong>data durability, read scalability, and disaster recovery<\/strong> without manual intervention.<\/li>\n<li>Combining replication with <strong>arbiter nodes<\/strong> can help manage elections without consuming full data resources.<\/li>\n<\/ul>\n<\/div>\n<p>A replica set refers to a database cluster composed of multiple nodes that have replication and automated failover configured among them. Typically, a replica set requires an odd number of members, optionally including an Arbiter node, to ensure the correct selection of the <strong>PRIMARY<\/strong> database.<\/p>\n<p>This primary <a class=\"ac-link-text\" href=\"https:\/\/accuweb.cloud\/database\" target=\"_blank\" rel=\"noopener\">database<\/a> handles all incoming write operations, storing them in its log. These operations can then be accessed and replicated by each <strong>SECONDARY<\/strong> member to their datasets, ensuring all servers have the same data and maintain its availability.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/mongodb-replica-set.jpg\"><img decoding=\"async\" class=\"aligncenter wp-image-37992 size-full\" title=\"Configuration Guide\" src=\"https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/mongodb-replica-set.jpg\" alt=\"Configuration Guide\" width=\"373\" height=\"433\" srcset=\"https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/mongodb-replica-set.jpg 373w, https:\/\/accuweb.cloud\/blog\/wp-content\/uploads\/2024\/07\/mongodb-replica-set-258x300.jpg 258w\" sizes=\"(max-width: 373px) 100vw, 373px\" \/><\/a><\/p>\n<p>If an unexpected issue occurs, causing the primary database to go down (e.g., due to hardware failure or connection interruption), an automatic election process begins to restore normal operation without manual intervention.<\/p>\n<p>This setup benefits from replication (such as failover redundancy, increased data availability and read capacity, disaster recovery, etc.) while simplifying the management of multiple databases.<\/p>\n<p>Here is a straightforward guide on creating and configuring a <a class=\"ac-link-text\" href=\"https:\/\/accuweb.cloud\/database\/mongodb-hosting\" target=\"_blank\" rel=\"noopener\">MongoDB<\/a> replica set with three members.<\/p>\n<p>This configuration is considered sufficient for most applications, providing a balance of data safety and performance to handle the necessary I\/O operations. We will cover preparing the environment, setting up authentication between DB nodes, configuring replication, and ensuring everything is correctly tuned.<\/p>\n<h2 id=\"Create-an-Environment\" class=\"ac-h2\">Create an Environment<\/h2>\n<p>To begin, you need at least three MongoDB nodes to set up a replica set. In this example, we&#8217;ll use MongoDB instances version 7.0.5 within a single environment.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication02-min.png\"><img decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45477 size-full\" title=\"Create an Environment\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication02-min.png\" alt=\"Create an Environment\" width=\"976\" height=\"649\" \/><\/a><\/p>\n<p>If needed, change the Environment Name and destination Region. Once the installation is complete, ensure the security of node communication using an authentication key file.<\/p>\n<div class=\"main-tooltip-only-btn\">\n<p><a class=\"tooltip-link\" href=\"https:\/\/accuweb.cloud\/database\/mongodb-hosting\" target=\"_blank\" rel=\"noopener\"><button class=\"tooltip-btn\">MongoDB Hosting <i class=\"fa-solid fa-arrow-right-long\"><\/i><\/button><\/a><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<h2 id=\"Adding-an-Authentication-Key-File-to-Your-Database\" class=\"ac-h2\">Adding an Authentication Key File to Your Database<\/h2>\n<p>Securing your <a class=\"ac-link-text\" href=\"https:\/\/accuweb.cloud\/database\" target=\"_blank\" rel=\"noopener\">database<\/a> communication is crucial. One way to do this is by using an authentication key file, ensuring that each member of your replica set can identify itself. Follow these steps to generate and distribute an authentication key file to protect your data from unauthorized access:<\/p>\n<p><strong>Step 1. <\/strong>Log into one of the database nodes using Web SSH.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication03.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45478 size-full\" title=\"Web SSH\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication03.png\" alt=\"Web SSH\" width=\"763\" height=\"337\" \/><\/a><\/p>\n<p><strong>Step 2. <\/strong>Use your own key file, or generate one using OpenSSL with the following command (using a key size of 741 bytes, for example, and naming it &#8220;my.key&#8221;):<\/p>\n<pre><code class=\"language-javascript\">\r\nopenssl rand -base64 741 &gt; my.key\r\n<\/code><\/pre>\n<p><strong>Step 3. <\/strong>Distribute the newly created key file to all <a class=\"ac-link-text\" href=\"https:\/\/accuweb.cloud\/database\/mongodb-hosting\" target=\"_blank\" rel=\"noopener\">MongoDB<\/a> instances:<\/p>\n<ul class=\"ac-ul\">\n<li>Click the Config button next to your database nodes to access the File Manager.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication04.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45479 size-full\" title=\"Config FIle\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication04.png\" alt=\"Config FIle\" width=\"792\" height=\"344\" \/><\/a><\/p>\n<ul class=\"ac-ul\">\n<li>In the configuration tab that opens, locate the <strong>my.key<\/strong> file at <strong>\/home\/jelastic\/my.key<\/strong> and rename it with the <strong>mongodb.key<\/strong> name.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication05.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45480 size-full\" title=\"Locate my.key\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication05.png\" alt=\"Locate my.key\" width=\"918\" height=\"415\" \/><\/a><\/p>\n<div class=\"accu-blog-space\">\n<div style=\"display: flex; justify-content: center;\">\n<div class=\"save-card1\"><a class=\"save-btn1\" href=\"https:\/\/accuweb.cloud\/register\">Start Registration \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<div class=\"accu-blog-space\"><\/div>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication06.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45481 size-full\" title=\"Renamed mongodb.key\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication06.png\" alt=\"Renamed mongodb.key\" width=\"1024\" height=\"454\" \/><\/a><\/p>\n<h2 id=\"Configure-the-MongoDB-Replication\" class=\"ac-h2\">Configure the MongoDB Replication<\/h2>\n<p>Once you\u2019ve secured everything as a key principle of data management, you can move on to configuring your replica set.<\/p>\n<p><strong>Step 1. <\/strong>Head over to the <strong>mongod.conf<\/strong> file inside the <strong>etc<\/strong> folder within the MongoDB nodes section. Scroll down to the <strong>replication<\/strong> section, then uncomment it and add a unique name for your replica set, such as <strong>rs0<\/strong>.<\/p>\n<pre><code class=\"language-javascript\">\r\nreplSetName: rs0\r\n<\/code><\/pre>\n<p><strong>Step 2. <\/strong>Next, include the <strong>keyFile<\/strong> parameter in the <strong>security<\/strong> section. Specify the path to your key file, like <strong>\/home\/jelastic\/mongodb.key<\/strong><\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication07-min.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45482 size-full\" title=\"Keyfile Parameter\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication07-min.png\" alt=\"Keyfile Parameter\" width=\"1038\" height=\"451\" \/><\/a><\/p>\n<p><strong>Step 3. <\/strong>Click the appropriate button in the editor window to instantly <strong>Save<\/strong> all changes.<\/p>\n<p><strong>Step 4. Restart<\/strong> your database <strong>nodes<\/strong> to apply the new configuration parameters.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication08.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45483 size-full\" title=\"Restart Node\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication08.png\" alt=\"Restart Node\" width=\"904\" height=\"378\" \/><\/a><\/p>\n<div class=\"accu-extra-top-space\"><\/div>\n<div class=\"blog-codebg\"><strong>Note:<\/strong> Remember that once you\u2019ve set up the replica set, the process of electing a new PRIMARY database will begin during any node restart, or when the PRIMARY node restarts (meaning downtime for the PRIMARY database).<\/div>\n<div class=\"accu-blog-space\"><\/div>\n<p><strong>Step 5. <\/strong>Connect to the MongoDB server you want to designate as PRIMARY using the SSH protocol.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication09.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45484 size-full\" title=\"Connect to mongoDB server\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication09.png\" alt=\"Connect to mongoDB server\" width=\"867\" height=\"440\" \/><\/a><\/p>\n<div class=\"accu-extra-top-space\"><\/div>\n<div class=\"blog-codebg\"><strong>Note:<\/strong> After the PRIMARY database is elected, other replica set members will be inaccessible for direct write operations. This means that any changes or configurations\u2014including access to the web admin panel\u2014can only be made to the current PRIMARY node. You will need to adjust your <a class=\"ac-link-text\" href=\"https:\/\/accuweb.cloud\/applications\" target=\"_blank\" rel=\"noopener\">application\u2019s<\/a> connection string to the new PRIMARY node, unless you\u2019ve set priority for each replica set member and designated one as the preferred PRIMARY.<\/div>\n<div class=\"accu-blog-space\"><\/div>\n<p><strong>Step 6. <\/strong>Access the replicated database with the appropriate admin user credentials:<br \/>\nmongo <strong>-u {user} -p {password} {DB_name}<\/strong><\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication10-min.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45485 size-full\" title=\"Access Database\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication10-min.png\" alt=\"Access Database\" width=\"998\" height=\"438\" \/><\/a><\/p>\n<p>Where:<\/p>\n<ul class=\"ac-ul\">\n<li><strong>{user}:<\/strong> Administrator username (typically sent to your email and often defaulted to <strong>admin<\/strong>).<\/li>\n<li><strong>{password}:<\/strong> Password for the administrator user (sent to your email as well).<\/li>\n<li><strong>{DB_name}:<\/strong> The database you want to replicate within the replica set (usually the default <strong>admin<\/strong> database).<\/li>\n<\/ul>\n<div class=\"main-tooltip-only-btn\">\n<p><a class=\"tooltip-link\" href=\"https:\/\/accuweb.cloud\/database\/mongodb-hosting\" target=\"_blank\" rel=\"noopener\"><button class=\"tooltip-btn\">MongoDB Hosting <i class=\"fa-solid fa-arrow-right-long\"><\/i><\/button><\/a><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"blog-codebg\"><strong>Note<\/strong>: if a new election takes place, the admin user credentials for logging into a new PRIMARY database will remain the same as those you used for the previous one.<\/div>\n<div class=\"accu-blog-space\"><\/div>\n<p><strong>Step 7. <\/strong>Once the connection is established, proceed with defining parameters for the current MongoDB node and initiating your replica set:<\/p>\n<pre><code class=\"language-javascript\">\r\nconfig = {_id : \"{replica_set}\", members : [{_id : 0, host:\"{current_db_ip}:27017\"},]}\r\nrs.initiate()\r\n<\/code><\/pre>\n<p>Be sure to replace the placeholders with the appropriate data:<\/p>\n<ul class=\"ac-ul\">\n<li><strong>{replica_set}:<\/strong> The name of your replicating database group, as indicated at the start of this section (in our example, &#8220;db-replication&#8221;).<\/li>\n<li><strong>{current_db_ip}:<\/strong> The IP address of the chosen database container.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication11.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45486 size-full\" title=\"IP Address\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication11.png\" alt=\"IP Address\" width=\"613\" height=\"392\" \/><\/a><\/p>\n<p>For instance:<\/p>\n<pre><code class=\"language-javascript\">\r\nconfig = {_id : \"rs0\", members : [{_id : 0, host:\"10.100.3.31:27017\"},]}\r\n<\/code><\/pre>\n<div class=\"accu-extra-top-space\"><\/div>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication12.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45487 size-full\" title=\"IP Address\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication12.png\" alt=\"IP Address\" width=\"1046\" height=\"427\" \/><\/a><\/p>\n<p>Then run the following command next to the <strong>admin&gt;<\/strong> to initiated this config settings<\/p>\n<pre><code class=\"language-javascript\">\r\nrs.initiate()\r\n<\/code><\/pre>\n<p><strong>Step 8. <\/strong>Run the following command for the remaining databases, replacing <strong>{db_ip}<\/strong> with the IP address of each database:<\/p>\n<div class=\"accu-extra-top-space\"><\/div>\n<pre><code class=\"language-javascript\">\r\nrs.add(\"{db_ip}:27017\")\r\n<\/code><\/pre>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication13.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45488 size-full\" title=\"Replace DB IP\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication13.png\" alt=\"Replace DB IP\" width=\"750\" height=\"458\" \/><\/a><\/p>\n<p><strong>Step 9. <\/strong>Once you&#8217;ve added all replication members, your replica set should be fully operational. If you want to confirm everything is configured correctly, execute the <strong>rs.status()<\/strong> command to view a comprehensive report on your replica set.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication14-min.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45489 size-full\" title=\"Replica set Report\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication14-min.png\" alt=\"Replica set Report\" width=\"759\" height=\"876\" \/><\/a><\/p>\n<h2 id=\"ReplicaSet-Arbiter\" class=\"ac-h2\">ReplicaSet Arbiter<\/h2>\n<p>For optimal reliability in a replica set, it&#8217;s best to have an odd number of members. If you\u2019re using an even number of nodes, consider adding an Arbiter node. This lightweight process helps maintain a quorum by responding to heartbeat and election requests from other replica set participants.<\/p>\n<ul class=\"ac-ul\">\n<li>The Arbiter does not store data and only votes in elections when a node fails.<\/li>\n<li>It is a lightweight process, consuming minimal resources.<\/li>\n<li>The Arbiter facilitates the exchange of encrypted user credentials between a set of replicas.<\/li>\n<li>It is advisable to deploy the Arbiter on a separate node to ensure high availability.<\/li>\n<\/ul>\n<p>Here&#8217;s a step-by-step guide to adding an Arbiter to your replica set:<\/p>\n<p><strong>Step 1. <\/strong>Expand your database cluster horizontally with one new node.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication15-min.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45491 size-full\" title=\"Scale Horizontally\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication15-min.png\" alt=\"Scale Horizontally\" width=\"976\" height=\"609\" \/><\/a><\/p>\n<div class=\"accu-extra-top-space\"><\/div>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication16.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45492 size-full\" title=\"Added Node\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication16.png\" alt=\"Added Node\" width=\"835\" height=\"238\" \/><\/a><\/p>\n<p><strong>Step 2. <\/strong>In the <strong>\/home\/jelastic<\/strong> directory, create a key file named <strong>mongodb.key<\/strong> and copy the contents from a similarly configured database node.<\/p>\n<p><strong>Step 3. <\/strong>Update the <strong>mongod.conf<\/strong> configuration file:<\/p>\n<p>Uncomment the <strong>replication<\/strong> section and Add a <strong>replSetName<\/strong> (e.g., replSetName:rs0).<br \/>\nInclude a <strong>keyFile<\/strong> parameter in the <strong>security<\/strong> section pointing to <strong>\/home\/jelastic\/mongodb.key<\/strong><\/p>\n<p><strong>Step 4. <\/strong>Restart the newly added node to apply these configuration settings.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication17.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45493 size-full\" title=\"Restart Node\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication17.png\" alt=\"Restart Node\" width=\"855\" height=\"231\" \/><\/a><\/p>\n<div class=\"accu-extra-top-space\"><\/div>\n<div class=\"blog-codebg\"><strong>Note:<\/strong> Don\u2019t restart all nodes at once. This could trigger a new PRIMARY election unless priorities have been specified to force a particular node to be elected as the PRIMARY node.<\/div>\n<div class=\"accu-blog-space\"><\/div>\n<p><strong>Step 5. <\/strong>Add the Arbiter to the replica set on the PRIMARY node by issuing the command:<\/p>\n<pre><code class=\"language-javascript\">\r\nrs.addArb(\"{db_ip}:27017\")\r\n<\/code><\/pre>\n<p>Replace <strong>{db_ip}<\/strong> with the IP address of the newly added node.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication18.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45494 size-full\" title=\"New Added IP\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication18.png\" alt=\"New Added IP\" width=\"624\" height=\"283\" \/><\/a><\/p>\n<p><strong>Step 6. <\/strong>Verify that the new node has indeed been added as an <strong>Arbiter<\/strong>. To do this, log in to the new node via SSH and connect to the MongoDB instance with credentials from the email you received upon node creation.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication19-min.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45495 size-full\" title=\"Node Added to Arbiter\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication19-min.png\" alt=\"Node Added to Arbiter\" width=\"717\" height=\"455\" \/><\/a><\/p>\n<p>The newly added node will then act as the Arbiter for the <strong>rs0<\/strong> replica set, ensuring quorum in any situation.<\/p>\n<div class=\"accu-blog-space\">\n<div style=\"display: flex; justify-content: center;\">\n<div class=\"save-card1\"><a class=\"save-btn1\" href=\"https:\/\/accuweb.cloud\/register\">Register Now \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<div class=\"accu-blog-space\"><\/div>\n<h2 id=\"Database-Cluster-Availability-Testing\" class=\"ac-h2\">Database Cluster Availability Testing<\/h2>\n<p>Our advanced MongoDB cluster setup lets you connect and execute various operations remotely. For instance, you can check its current state by connecting and running a few monitoring commands via a simple <a class=\"ac-link-text\" href=\"https:\/\/accuweb.cloud\/application\/php-hosting\" target=\"_blank\" rel=\"noopener\">PHP<\/a> app.<\/p>\n<p>You&#8217;ll need a web server, like Apache, to make this work. If you haven&#8217;t set one up yet, add it to your environment, or create it in a separate environment.<\/p>\n<p><strong>Step 1. <\/strong>Click the <strong>Change Environment Topology<\/strong> button and include the server.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication20.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45496 size-full\" title=\"Change Environment Topology\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication20.png\" alt=\"Change Environment Topology\" width=\"883\" height=\"332\" \/><\/a><\/p>\n<div class=\"accu-extra-top-space\"><\/div>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication21-min.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45497 size-full\" title=\"Application Server\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication21-min.png\" alt=\"Application Server\" width=\"978\" height=\"605\" \/><\/a><\/p>\n<p><strong>Step 2. <\/strong>Open the Configuration Manager tab for <strong>Apache<\/strong> by clicking on the <strong>Config<\/strong> icon next to it.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication22.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45498 size-full\" title=\"Config File\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication22.png\" alt=\"Config File\" width=\"823\" height=\"315\" \/><\/a><\/p>\n<p><strong>Step 3. <\/strong>Navigate to <strong>\/var\/www\/webroot\/ROOT<\/strong>, open the <strong>index.php<\/strong> file, and replace its default content with the following code.<\/p>\n<pre><code class=\"language-javascript\">\r\n&lt;?php\r\ntry{\r\n$mongodbConnectionURI= \"mongodb:\/\/{db_username}:{db_password}@node{NodeID}-{environment_domain}:27017,node{NodeID}-{environment_domain}:27017,node{NodeID}-{environment_domain}:27017,node{NodeID}-{environment_domain}:27017\/?replicaSet={replica_set_name}&amp;readPreference=primary\";\r\n$manager = new MongoDB\\Driver\\Manager($mongodbConnectionURI);\r\n$command = new MongoDB\\Driver\\Command(['ping' =&gt; 1]);\r\n$cursor = $manager-&gt;executeCommand('db', $command);\r\n$response = $cursor-&gt;toArray()[0];\r\nvar_dump($response);\r\necho'&lt;br&gt;&lt;br&gt;';\r\nvar_dump($manager-&gt;getServers());\r\n} catch (Exception $e){\r\necho $e-&gt;getMessage();\r\n}\r\n?&gt;\r\n<\/code><\/pre>\n<p>Make sure to substitute the placeholders with the relevant data:<\/p>\n<ul class=\"ac-ul\">\n<li><strong>{replica_set_name}<\/strong> \u2013 Your replica set name<\/li>\n<li><strong>{db_username}<\/strong> \u2013 Admin user of the chosen primary database (default is admin)<\/li>\n<li><strong>{db_password}<\/strong> \u2013 Password for the admin user<\/li>\n<li><strong>{NodeID}<\/strong> \u2013 Identification number of the corresponding node from the Jelastic dashboard<\/li>\n<li><strong>{environment_domain}<\/strong> \u2013 Environment domain from the Jelastic dashboard<\/li>\n<\/ul>\n<div class=\"main-tooltip-only-btn\">\n<p><a class=\"tooltip-link\" href=\"https:\/\/accuweb.cloud\/database\/mongodb-hosting\" target=\"_blank\" rel=\"noopener\"><button class=\"tooltip-btn\">MongoDB Hosting <i class=\"fa-solid fa-arrow-right-long\"><\/i><\/button><\/a><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication23.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45499 size-full\" title=\"Verify Data\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication23.png\" alt=\"Verify Data\" width=\"558\" height=\"333\" \/><\/a><\/p>\n<div class=\"accu-extra-top-space\"><\/div>\n<div class=\"blog-codebg\"><strong>Note:<\/strong> Specify the ID of each node in your replica set in the mongodbConnectionURI section.<\/div>\n<div class=\"accu-blog-space\"><\/div>\n<p>Consequently, you&#8217;ll obtain a comparable set of strings:<br \/>\n<a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication24-min.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45500 size-full\" title=\"Specify the ID\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication24-min.png\" alt=\"Specify the ID\" width=\"1298\" height=\"668\" \/><\/a><\/p>\n<p>Don&#8217;t forget to <strong>Save<\/strong> the file.<\/p>\n<p><strong>Step 4. <\/strong>Apache requires a special module to connect to <a class=\"ac-link-text\" href=\"https:\/\/accuweb.cloud\/database\/mongodb-hosting\" target=\"_blank\" rel=\"noopener\">MongoDB<\/a>, so you&#8217;ll need to enable it in the <strong>php.ini<\/strong> file in the <strong>etc<\/strong> directory. Remove the semicolon before <strong>extension=mongodb.so<\/strong> to activate it.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication25-min.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45501 size-full\" title=\"php.ini file\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication25-min.png\" alt=\"php.ini file\" width=\"1028\" height=\"500\" \/><\/a><\/p>\n<p><strong>Step 5. <\/strong>After saving, hit <strong>Restart Nodes<\/strong> next to your web server to apply the new configurations.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication26.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45502 size-full\" title=\"Restart Nodes\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication26.png\" alt=\"Restart Nodes\" width=\"966\" height=\"466\" \/><\/a><\/p>\n<p><strong>Step 6. <\/strong>Finally, click the <strong>Open in Browser<\/strong> icon nearby.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication27.png\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45503 size-full\" title=\"Open in Browser\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MongoDB-Replication27.png\" alt=\"Open in Browser\" width=\"876\" height=\"319\" \/><\/a><\/p>\n<p>In a new browser tab, you&#8217;ll see details about your replica set members and their accessibility.<\/p>\n<p><a href=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MDB-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"acc-blog-image aligncenter wp-image-45512 size-full\" title=\"Replica Details in Browser\" src=\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/07\/MDB-1.jpg\" alt=\"Replica Details in Browser\" width=\"992\" height=\"415\" \/><\/a><\/p>\n<p>The first line shows the result of checking the availability of the replica set, which is executed by the <strong>&#8220;ping&#8221;<\/strong> command (line 6 of <strong>index.php<\/strong>).<\/p>\n<pre><code class=\"language-javascript\">\r\nobject(stdClass)#11 (3) { [\"ok\"]=&gt; float(1)\r\n<\/code><\/pre>\n<p>This confirms that the replica set has been successfully tested.<\/p>\n<p>In the next section of the output, you\u2019ll find a detailed list of replica set hosts, which is retrieved using the <strong>getServers<\/strong> function on line 11 of <strong>index.php.<\/strong> For instance, you can observe some of the values that are assigned during the creation of the replica set:<\/p>\n<ul class=\"ac-ul\">\n<li><strong>Host:<\/strong> This is the IP address of the specific database.<\/li>\n<li><strong>Port:<\/strong> This is the port used by the current replication member.<\/li>\n<li><strong>[&#8220;is_primary&#8221;]<\/strong> and <strong>[&#8220;is_secondary&#8221;]:<\/strong> These parameters indicate the server\u2019s status. For the primary MongoDB server, the values are true and false; for the other two MongoDB servers, the values are false and true.<\/li>\n<\/ul>\n<p>Additionally, you can start or stop any of your database nodes and refresh this page to monitor the changes. This way, you can confirm that your MongoDB cluster is up and running as expected, making it suitable for any real-world <a class=\"ac-link-text\" href=\"https:\/\/accuweb.cloud\/applications\" target=\"_blank\" rel=\"noopener\">application.<\/a><\/p>\n<div class=\"accu-blog-space\"><\/div>\n<div class=\"accu-top-cta-space\">\n<div style=\"display: flex; justify-content: center;\">\n<div class=\"save-card1\"><a class=\"save-btn1\" href=\"https:\/\/accuweb.cloud\/register\">Start Registration \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<div class=\"accu-bottom-cta-space\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>MongoDB Replication and Automated Failover: Configuration Guide TL;DR MongoDB replication uses replica sets to maintain identical copies of data across multiple servers for high availability. Primary and secondary nodes ensure read\/write distribution; secondaries can take over if the primary fails. Automated failover detects primary node failure and promotes a secondary node automatically, minimizing downtime. Replica [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":41938,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"no","footnotes":""},"categories":[409],"tags":[257,256,255],"class_list":["post-37971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","tag-automated-failover-setup","tag-mongodb-configuration-guide","tag-mongodb-replication"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.10 (Yoast SEO v26.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MongoDB Replication &amp; Automated Failover Explained<\/title>\n<meta name=\"description\" content=\"Learn how MongoDB replication and automated failover enhance data availability and resilience by synchronizing replica sets and handling node failures seamlessly.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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