{"id":111821,"date":"2021-03-08T11:40:28","date_gmt":"2021-03-08T06:10:28","guid":{"rendered":"https:\/\/www.vskills.in\/certification\/tutorial\/?page_id=111821"},"modified":"2024-04-12T14:31:36","modified_gmt":"2024-04-12T09:01:36","slug":"convert-a-standalone-to-a-replica-set","status":"publish","type":"page","link":"https:\/\/www.vskills.in\/certification\/tutorial\/convert-a-standalone-to-a-replica-set\/","title":{"rendered":"Convert a Standalone to a Replica Set"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\"><strong>Convert a Standalone to a Replica Set<\/strong><\/h4>\n\n\n\n<p>This tutorial describes the process for converting a standalone mongod instance into a three-member replica set. Use standalone instances for testing and development, but always use replica sets in production. The procedure is as<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shut down the standalone mongod instance.<\/li>\n\n\n\n<li>Restart the instance. Use the &#8211;replSet option to specify the name of the new replica set. For example, the following command starts a standalone instance as a member of a new replica set named rs0. The command uses the standalone\u2019s existing database path of \/srv\/mongodb\/db0:<\/li>\n<\/ul>\n\n\n\n<p>mongod &#8211;port 27017 &#8211;dbpath \/srv\/mongodb\/db0 &#8211;replSet rs0<\/p>\n\n\n\n<p>If your application connects to more than one replica set, each set should have a distinct name. Some drivers group replica set connections by replica set name.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connect to the mongod instance.<\/li>\n\n\n\n<li>Use rs.initiate() to initiate the new replica set<\/li>\n<\/ul>\n\n\n\n<p>The replica set is now operational. To view the replica set configuration, use rs.conf(). To check the status of the replica set, use rs.status().<\/p>\n\n\n\n<p><strong>Expand the Replica Set<\/strong> &#8211; Add additional replica set members by doing the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>On two distinct systems, start two new standalone mongod instances.<\/li>\n\n\n\n<li>On your connection to the original mongod instance (the former standalone instance), issue a command in the following form for each new instance to add to the replica set:<\/li>\n<\/ul>\n\n\n\n<p>rs.add(&#8220;&lt;hostname&gt;&lt;:port&gt;&#8221;)<\/p>\n\n\n\n<p>Replace &lt;hostname&gt; and &lt;port&gt; with the resolvable hostname and port of the mongod instance to add to the set.<\/p>\n\n\n\n<p><strong>Sharding Considerations<\/strong> &#8211; If the new replica set is part of a sharded cluster, change the shard host information in the config database by doing the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connect to one of the sharded cluster\u2019s mongos instances and issue a command in the following form:<\/li>\n<\/ul>\n\n\n\n<p>db.getSiblingDB(&#8220;config&#8221;).shards.save( {_id: &#8220;&lt;name&gt;&#8221;, host: &#8220;&lt;replica-set&gt;\/&lt;member,&gt;&lt;member,&gt;&lt;&#8230;&gt;&#8221; } )<\/p>\n\n\n\n<p>Replace &lt;name&gt; with the name of the shard. Replace &lt;replica-set&gt; with the name of the replica set. Replace &lt;member,&gt;&lt;member,&gt;&lt;&gt; with the list of the members of the replica set.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Restart all mongos instances. If possible, restart all components of the replica sets (i.e., all mongos and all shard mongod instances).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Apply for MongoDB Certification Now!!<\/h3>\n\n\n\n<p><a href=\"https:\/\/www.vskills.in\/certification\/databases\/mongodb-server-administrator\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.vskills.in\/certification\/databases\/mongodb-server-administrator<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><a href=\"https:\/\/www.vskills.in\/certification\/tutorial\/certified-mongodb-professional\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Back to Tutorial<\/strong><\/a><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Convert a Standalone to a Replica Set This tutorial describes the process for converting a standalone mongod instance into a three-member replica set. Use standalone instances for testing and development, but always use replica sets in production. The procedure is as mongod &#8211;port 27017 &#8211;dbpath \/srv\/mongodb\/db0 &#8211;replSet rs0 If your application connects to more than&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[73],"tags":[],"class_list":["post-111821","page","type-page","status-publish","hentry","category-mongodb"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Convert a Standalone to a Replica Set - Tutorial<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vskills.in\/certification\/tutorial\/convert-a-standalone-to-a-replica-set\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Convert a Standalone to a Replica Set - Tutorial\" \/>\n<meta property=\"og:description\" content=\"Convert a Standalone to a Replica Set This tutorial describes the process for converting a standalone mongod instance into a three-member replica set. 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