{"id":5573,"date":"2024-04-17T07:35:31","date_gmt":"2024-04-17T07:35:31","guid":{"rendered":"https:\/\/test.opensource-db.in\/wp1\/?p=5573"},"modified":"2024-04-24T03:31:26","modified_gmt":"2024-04-24T03:31:26","slug":"setting-up-high-availability-with-repmgr","status":"publish","type":"post","link":"https:\/\/test.opensource-db.in\/wp1\/setting-up-high-availability-with-repmgr\/","title":{"rendered":"Building PostgreSQL HA Systems with repmgr"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Welcome to our latest blog post! Today, we&#8217;ll delve into the intricacies of setting up PostgreSQL High availability (HA) production cluster for a prominent client in the banking sector. Our task? Designing and implementing a robust HA solution for their PODS, with PostgreSQL as the database backbone. Join us as we navigate through the process of establishing a four-node repmgr cluster, ensuring continuous availability and data integrity for our esteemed client.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why repmgr<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">repmgr is a popular tool used for managing PostgreSQL replication and failover in high availability (HA) environments. It simplifies the setup and management of PostgreSQL replication by providing easy-to-use commands and tools for configuration, monitoring, and failover. One of its key features is its ability to automatically detect primary node failures and promote a standby node to become the new primary.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Provision four EC2 instances.<\/li>\n\n\n\n<li>Install PostgreSQL 14 on each node (why not the latest &#8211; Application compatibility)<\/li>\n\n\n\n<li>Install repmgr on each node<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Setup<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Splitting the four nodes into &nbsp;1&nbsp; primary node, 2 standby nodes &amp; 1 witness node.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before setting up the repmgr , we need to add the IPv4 address of four nodes&nbsp; to a single security group in EC2 instances.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">In Primary node:<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Create the user and database accordingly and also do entries of remaining nodes in pg_hba.conf of primary server.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#Changes of parameters in Postgresql.conf\n\nmax_wal_senders = 10\nmax_replication_slots = 10\nwal_level ='logical' #to enable logical decoding in future\nhot_standby = on\narchive_mode = on\narchive_command = '\/bin\/true'\nshared_preload_libraries = 'repmgr'\n\n#Restart the services after changing the parameters in postgresql.conf file.<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Then, we need to create a repmgr configuration file with the following parameters:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cluster='clientname_prod'\nnode_id=1\nnode_name=node1\nconninfo='host=node1 user=myuser dbname=mydb connect_timeout=2'\ndata_directory='\/var\/lib\/pgsql\/14\/data\/'\nfailover=automatic\npromote_command='\/usr\/pgsql-14\/bin\/repmgr standby promote -f \/var\/lib\/pgsql\/repmgr.conf --log-to-file'\nfollow_command='\/usr\/pgsql-14\/bin\/repmgr standby follow -f \/var\/lib\/pgsql\/repmgr.conf --log-to-file --upstream-node-id=%n'<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Now, we need to register the Primary using the command<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/pgsql-14\/bin\/repmgr -f \/var\/lib\/pgsql\/repmgr.conf primary register\n\n#To check whether the primary server is registered or not,\n\/usr\/pgsql-14\/bin\/repmgr -f \/var\/lib\/pgsql\/repmgr.conf  cluster show\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Once the primary is&nbsp; registered, we can setup the standby node<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">In Standby node<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Two steps:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One is standby clone and the other is standby register. <br>Before that, let us create the repmgr configuration file in the standby server.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>node_id=2\nnode_name=node2\nconninfo='host=(Standby IP address) user=myuser dbname=mydb connect_timeout=2'\ndata_directory='\/var\/lib\/pgsql\/14\/data'\nfailover=automatic\npromote_command='\/usr\/pgsql-14\/bin\/repmgr standby promote -f \/var\/lib\/pgsql\/repmgr.conf --log-to-file'\nfollow_command='\/usr\/pgsql-14\/bin\/repmgr standby follow -f \/var\/lib\/pgsql\/repmgr.conf --log-to-file --upstream-node-id=%n'<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Now, let us do a dry run before cloning using the command,<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/pgsql-14\/bin\/repmgr -h (Primary IP address) -U myuser -d mydb -f \/var\/lib\/pgsql\/repmgr.conf standby clone --dry-run<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If it is successful, let us do the standby clone using the command<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/pgsql-14\/bin\/repmgr -h (Primary IP address) -U myuser -d mydb -f \/var\/lib\/pgsql\/repmgr.conf standby clone<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Once the cloning is done ,Register the standby now using the command<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/pgsql-14\/bin\/repmgr -f \/var\/lib\/pgsql\/repmgr.conf standby register<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Make sure that you stop the PostgreSQL server while doing the Standby clone and restart it before registering the standby.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Repeat the same process with the second standby too.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">In Witness node<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In the witness node, the parameter changes would need to be made in <code>postgresql.conf<\/code> file, and entries in <code>pg_hba.conf<\/code> need to be added similar to what we did in Primary; and also create the repmgr configuration file accordingly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To register the witness node, use the command<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/pgsql-14\/bin\/repmgr -f \/var\/lib\/pgsql\/repmgr.conf witness register -h (Primary IP)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Now, we have all of the four nodes ready and registered as needed. You could use the cluster show command to check the nodes and verify that everything is in order.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Automate the failover<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"> To automate the failover, there is a process called repmgrd daemon. It is a background process that runs continuously to manage PostgreSQL replication and failover using repmgr. It is a crucial component of the repmgr toolset, providing automated monitoring, management, and failover capabilities for PostgreSQL replication clusters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To activate <code>repmgrd<\/code>, use the command<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/pgsql-14\/bin\/repmgrd -f \/var\/lib\/pgsql\/repmgr.conf\n\n#To check the events, use the command:\n\/usr\/pgsql-14\/bin\/repmgr -f \/var\/lib\/pgsql\/repmgr.conf cluster event\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In conclusion, the successful implementation of the four-node repmgr cluster enabled our client to achieve HA for their Microservices architecture, bolstering data resilience and ensuring uninterrupted service delivery in a mission-critical banking environment. With repmgr&#8217;s robust features and our expertise, we provided a reliable and scalable solution tailored to the client&#8217;s specific requirements. To this setup , we also added <code>PgBouncer<\/code> and <code>keepalived<\/code>. If you want to know more about the architecture and how it works with a practical approach, please stay tuned for this series..<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Welcome to our latest blog post! Today, we&#8217;ll delve into the intricacies of setting up PostgreSQL High availability (HA) [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":5588,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[52,1,23],"tags":[],"class_list":["post-5573","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-customer-success","category-others","category-postgresql-14"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Building PostgreSQL HA Systems with repmgr - OpenSource DB<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Building PostgreSQL HA Systems with repmgr - OpenSource DB\" \/>\n<meta property=\"og:description\" content=\"Introduction Welcome to our latest blog post! 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