{"id":1186,"date":"2021-04-12T12:12:29","date_gmt":"2021-04-12T10:12:29","guid":{"rendered":"https:\/\/devpath.pro\/?p=1186"},"modified":"2021-04-12T12:12:29","modified_gmt":"2021-04-12T10:12:29","slug":"save-yourself-from-a-disaster-4-redundancy-of-storage","status":"publish","type":"post","link":"https:\/\/fabiocicerchia.it\/web\/save-yourself-from-a-disaster-4-redundancy-of-storage","title":{"rendered":"Save yourself from a disaster #4: Redundancy of Storage"},"content":{"rendered":"<p style=\"text-align: center;\">This is the fourth part of the series <a href=\"https:\/\/devpath.pro\/web\/save-yourself-from-a-disaster-redundancy-on-a-budget\/\">Save yourself from a disaster: Redundancy on a budget<\/a>.<\/p>\n<p>How can we make sure our second most important asset is safely secured in case of a disaster?<\/p>\n<p>We could mainly 2 things:<\/p>\n<ul>\n<li>Distributed Storage<\/li>\n<li><a href=\"https:\/\/devpath.pro\/web\/save-yourself-from-a-disaster-2-secure-the-storage\/\">Backups<\/a><\/li>\n<\/ul>\n<p><!--more--><\/p>\n<div style=\"border: 1px solid darkyellow; background: lightyellow; padding: 0.5em; line-height: 0.9em;\"><small><strong>Disclaimer<\/strong><br \/>\nThis guide won&#8217;t cover everything, it won&#8217;t be a comprehensive guide, and the steps that are shown need to be carefully reviewed and tested in your development\/pre-production environment. I don&#8217;t take any responsibility for any damage, interruption of service nor leak\/loss of data for the use of the instructions in the ebook (nor from any external website I&#8217;ve mentioned).<\/small><\/div>\n<h2>Distributed Storage<\/h2>\n<p>Although we could use some distributed filesystem like <a href=\"https:\/\/ceph.io\/\">Ceph<\/a>, <a href=\"https:\/\/linbit.com\/drbd\/\">DRBD<\/a>, <a href=\"https:\/\/docs.gluster.org\/en\/latest\/\">GlusterFS<\/a>, or <a href=\"https:\/\/openzfs.org\/\">ZFS<\/a>, then it won&#8217;t be on a budget and also the complexity introduced by those tools will need to addressed properly. I will not cover it here due to the costs of extra nodes and extra configuration needed &#8211; you&#8217;re time have a cost too (but if your filesystem changes frequently this is your only option).<\/p>\n<p><strong>Ad-Hoc Solutions<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/www.howtoforge.com\/tutorial\/how-to-build-a-ceph-cluster-on-centos-7\/\"><span style=\"font-weight: 400;\">How to build a Ceph Distributed Storage Cluster on CentOS 7<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/www.tecmint.com\/setup-drbd-storage-replication-on-centos-7\/\"><span style=\"font-weight: 400;\">How to Setup DRBD to Replicate Storage on Two CentOS 7 Servers<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/www.digitalocean.com\/community\/tutorials\/how-to-create-a-redundant-storage-pool-using-glusterfs-on-ubuntu-18-04\"><span style=\"font-weight: 400;\">How To Create a Redundant Storage Pool Using GlusterFS on Ubuntu 18.04<\/span><\/a><\/li>\n<li aria-level=\"1\"><a href=\"https:\/\/www.howtogeek.com\/175159\/an-introduction-to-the-z-file-system-zfs-for-linux\/\">An Introduction to the Z File System (ZFS) for Linux<\/a><\/li>\n<\/ul>\n<p><strong>Quick &amp; Dirty: Cross Sync<\/strong><\/p>\n<p>Let&#8217;s use a simple cronjob every hour to sync the whole shared folder to all remote locations.<\/p>\n<p>Server #1:<\/p>\n<pre>rsync -e \"ssh -i $HOME\/.ssh\/somekey\" -auv --progress \/path\/to\/shared\/folder\/ syncer@&lt;IP2&gt;:\/path\/to\/shared\/folder<\/pre>\n<p>Server #2:<\/p>\n<pre>rsync -e \"ssh -i $HOME\/.ssh\/somekey\" -auv --progress \/path\/to\/shared\/folder\/ syncer@&lt;IP1&gt;:\/path\/to\/shared\/folder<\/pre>\n<p>Remember, this is not a proper distributed solution, rsync looks like an old-fashioned solution, it did save me lots of times. This approach is not feasible for &#8220;real-time&#8221; synchronization, they are just for (very) infrequent changes. Distributed filesystem like GlusterFS (or Ceph, or DRBD) are solutions for the long run.<\/p>\n<p><strong>Security<\/strong><\/p>\n<p>Remember to secure the connection between one host to the others (eg. with a firewall).<\/p>\n<hr \/>\n<p>The next post will be about Redundancy of\u00a0Web Servers, Stay Tuned.<\/p>\n<p style=\"text-align: center; text-decoration: underline; color: darkblue; font-weight: bold;\">Check out the whole version of this post in the <a style=\"color: #000080; text-decoration: underline;\" href=\"https:\/\/leanpub.com\/savefromdisaster\">ebook.<br \/>\n<img decoding=\"async\" style=\"height: 100px;\" src=\"https:\/\/d2sofvawe08yqg.cloudfront.net\/savefromdisaster\/small\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is the fourth part of the series Save yourself from a disaster: Redundancy on a budget. How can we make sure our second most important asset is safely secured in case of a disaster? We could mainly 2 things: Distributed Storage Backups<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":""},"categories":[14],"tags":[122,123,124,125],"aioseo_notices":[],"author_meta":{"display_name":"fabio","author_link":"https:\/\/fabiocicerchia.it\/author\/fabio"},"featured_img":null,"coauthors":[],"tax_additional":{"categories":{"linked":["<a href=\"https:\/\/fabiocicerchia.it\/category\/web\" class=\"advgb-post-tax-term\">Web<\/a>"],"unlinked":["<span class=\"advgb-post-tax-term\">Web<\/span>"]},"tags":{"linked":["<a href=\"https:\/\/fabiocicerchia.it\/category\/web\" class=\"advgb-post-tax-term\">disaster recovery<\/a>","<a href=\"https:\/\/fabiocicerchia.it\/category\/web\" class=\"advgb-post-tax-term\">ovh<\/a>","<a href=\"https:\/\/fabiocicerchia.it\/category\/web\" class=\"advgb-post-tax-term\">redundancy<\/a>","<a href=\"https:\/\/fabiocicerchia.it\/category\/web\" class=\"advgb-post-tax-term\">sbg2<\/a>"],"unlinked":["<span class=\"advgb-post-tax-term\">disaster recovery<\/span>","<span class=\"advgb-post-tax-term\">ovh<\/span>","<span class=\"advgb-post-tax-term\">redundancy<\/span>","<span class=\"advgb-post-tax-term\">sbg2<\/span>"]}},"comment_count":"0","relative_dates":{"created":"Posted 3 years ago","modified":"Updated 3 years ago"},"absolute_dates":{"created":"Posted on April 12, 2021","modified":"Updated on April 12, 2021"},"absolute_dates_time":{"created":"Posted on April 12, 2021 12:12 pm","modified":"Updated on April 12, 2021 12:12 pm"},"featured_img_caption":"","series_order":"","_links":{"self":[{"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/posts\/1186"}],"collection":[{"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/comments?post=1186"}],"version-history":[{"count":0,"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/posts\/1186\/revisions"}],"wp:attachment":[{"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/media?parent=1186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/categories?post=1186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fabiocicerchia.it\/wp-json\/wp\/v2\/tags?post=1186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}