{"id":1439,"date":"2018-08-09T08:53:59","date_gmt":"2018-08-09T08:53:59","guid":{"rendered":"http:\/\/dbtut.com\/?p=1439"},"modified":"2018-11-09T20:59:11","modified_gmt":"2018-11-09T20:59:11","slug":"back-up-a-sharded-cluster-with-file-system-snapshots","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/08\/09\/back-up-a-sharded-cluster-with-file-system-snapshots\/","title":{"rendered":"Back Up a Sharded Cluster with File System Snapshots"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>In MongoDB we can take backups with database dumps or filesystem snapshots. In large databases it is recommended to use file system snapshots rather than dump backups. Any file system snapshot tool can be used as LVM snapshots. In our system LVM can be used.<\/p>\n<p>The process is given bleow:<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Step 1:<\/strong> Disable the balancer.<\/p>\n<p>connect to the mongos session:<\/p>\n<pre class=\"lang:default decode:true \">use config\r\n\r\nsh.stopBalancer()<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Step 2:<\/strong> Start LVM snapshot for data files directory<\/p>\n<p>I have db files in \/db directory which has the filesystem : \/dev\/mapper\/dbvg-dblv<\/p>\n<pre class=\"lang:default decode:true\">df -h\r\nFilesystem Size Used Avail Use% Mounted on\r\n\r\n.....\r\n\r\n\/dev\/mapper\/dbvg-dblv 949G 843G 107G 89% \/db\r\n\r\n.....<\/pre>\n<p>&nbsp;<\/p>\n<p>So I need to create the lvm sbapshot of \/dev\/mapper\/dbvg-dblv<\/p>\n<pre class=\"lang:default decode:true \">sudo lvcreate --size 500M --snapshot --name mdb-snap01 \/dev\/mapper\/dbvg-dblv\r\n\r\nUsing default stripesize 64.00 KiB.\r\n\r\nLogical volume \"mdb-snap01\" created.\r\n\r\ncd \/dev\/mapper\/\r\n\r\nls\r\n\r\ndbvg-dblv dbvg-dblv-real dbvg-mdbshard01--snap01 dbvg-mdbshard01--snap01-cow dbvg-mdb--snap01 dbvg-mdb--snap01-cow dbvg-mdb--snap02 dbvg-mdb--snap02-cow<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Step 3:<\/strong> take backup to another directory<\/p>\n<p>The snapshot file is created. But the backup process is not finished. We need to take the backup to another storage. So first we need to unmount the snap.<\/p>\n<pre class=\"lang:default decode:true \">sudo umount \/dev\/mapper\/dbvg-mdb--snap01\r\n\r\numount: \/dev\/mapper\/dbvg-mdb--snap01: not mounted<\/pre>\n<p>&nbsp;<\/p>\n<p>Then we can zip the snap file and copy it to another directory. So we can use it if anything happens to the datafile directory.<\/p>\n<pre class=\"lang:default decode:true \">[ mapper]$ sudo dd if=\/dev\/mapper\/dbvg-mdb--snap01 | gzip &gt; \/mongodbbackup\/mdb-snap01.gz<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Step 4:<\/strong> Reenable the balancer<\/p>\n<p>connect to the mongos session:<\/p>\n<pre class=\"lang:default decode:true \">use config\r\n\r\nsh.startBalancer()<\/pre>\n\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1439\" class=\"pvc_stats all  \" data-element-id=\"1439\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; In MongoDB we can take backups with database dumps or filesystem snapshots. In large databases it is recommended to use file system snapshots rather than dump backups. Any file system snapshot tool can be used as LVM snapshots. In our system LVM can be used. The process is given bleow: &nbsp; Step 1: Disable &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_1439\" class=\"pvc_stats all  \" data-element-id=\"1439\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[1306],"tags":[20,1371,155],"class_list":["post-1439","post","type-post","status-publish","format-standard","","category-mongodb","tag-backup","tag-mongodb","tag-snapshot"],"aioseo_notices":[],"a3_pvc":{"activated":true,"total_views":461,"today_views":0},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Back Up a Sharded Cluster with File System Snapshots - Database Tutorials<\/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:\/\/dbtut.com\/index.php\/2018\/08\/09\/back-up-a-sharded-cluster-with-file-system-snapshots\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Back Up a Sharded Cluster with File System Snapshots - Database Tutorials\" \/>\n<meta property=\"og:description\" content=\"&nbsp; In MongoDB we can take backups with database dumps or filesystem snapshots. 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