{"id":24931,"date":"2023-05-03T15:58:53","date_gmt":"2023-05-03T13:58:53","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/?p=24931"},"modified":"2023-05-03T15:58:53","modified_gmt":"2023-05-03T13:58:53","slug":"mariadb-manual-switchover","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/mariadb-manual-switchover\/","title":{"rendered":"MariaDB manual Switchover"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">I\u2019m going to explain how to do a manual Switchover in a MariaDB HA setups using master-slave replication.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In my example, let\u2019s consider that I\u2019ve a server01 and server02, both running on Ubuntu 20.04.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">server02 is currently the master, server01 the slave.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">We\u2019ll perform a switchover to come back to a normal status, meaning server01 as master and server02 as slave.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stop all the connections to the DB<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>root@server02:~# mysql\nmysql&gt; flush tables with read lock;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Recovering information from the master<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Note the values for the parameters File and Position.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>root@server02:~# mysql\nmysql&gt; SHOW MASTER STATUS\\G;\n\n***** 1. row *****\nFile: mysql-bin.007747\nPosition: 5512879\nBinlog_Do_DB:\nBinlog_Ignore_DB:\nExecuted_Gtid_Set:\n1 row in set (0.00 sec)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Check slave status<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">We check that the replication is working properly and that the values for the parameters Master_Log_File and Read_Master_Log_Pos correspond to the values noted in point 1.3.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>root@server01:~# mysql\nmysql&gt; SHOW SLAVE STATUS\\G;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Stop slave and do the Switchover<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">From this step, the slave should switch back to master.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Stop the slave, reset the slave configuration to 0, reset the master configuration to 0 and switch over.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Finally we check that the changes have been made.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>root@server01:~# mysql\nmysql&gt; STOP SLAVE;\nmysql&gt; reset slave all;\nmysql&gt; RESET MASTER;\nmysql&gt; SHOW SLAVE STATUS\\G;\nmysql&gt; SHOW MASTER STATUS\\G<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Change configuration in my.cnf<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In the configuration of the instance, we set the slave as read only and the opposite for the master.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>### On Master ###\nroot@server01:~# cd \/etc\/mysql\/\nroot@server01:\/etc\/mysql# vi mysql.conf.d\/mysqld.cnf\n\n# In my.cnf:\nread_only=0\nsuper_read_only=0\n\n### On slave ###\nroot@server02:~# cd \/etc\/mysql\/\nroot@server02:\/etc\/mysql# vi mysql.conf.d\/mysqld.cnf\n\n# In my.cnf:\nread_only=1\nsuper_read_only=1<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Restart mysql service<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Restart the service to apply the changes in my.cnf<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>### On Master ###\n# Stop the MySQL service\nroot@server01:~# systemctl stop mysql.service\n\n# Start the MySQL service\nroot@server01:~# systemctl start mysql.service\n\n### On slave ###\n# Stop the MySQL service\nroot@server02:~# systemctl stop mysql.service\n\n# Start the MySQL service\nroot@server02:~# systemctl start mysql.service<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Configure replication on new slave<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>root@server02:~# mysql\nmysql&gt; CHANGE MASTER TO MASTER_HOST='MASTER IP', MASTER_USER='repl', MASTER_PASSWORD='***';\nmysql&gt; START SLAVE;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">VIP address swap<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If the VIP address is on the server with the slave instance, we set up the VIP on the server with the master instance.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>### On Slave ###\nroot@server02:~# ip addr del VIP.AD.DR.ESS\/28 dev ens160\n\n### On Master ###\nroot@server01:~# ip addr add VIP.AD.DR.ESS\/28 dev ens160\n\n### If blocked by firewall ###\niptables -I INPUT -i ens160 -d VIP.AD.DR.ESS -p icmp --icmp-type echo-request -j ACCEPT<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The cluster is now back to a normal status, with server01 as master and server02 as slave.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I\u2019m going to explain how to do a manual Switchover in a MariaDB HA setups using master-slave replication. In my example, let\u2019s consider that I\u2019ve a server01 and server02, both running on Ubuntu 20.04. server02 is currently the master, server01 the slave. We\u2019ll perform a switchover to come back to a normal status, meaning server01&hellip;&nbsp;<\/p>\n","protected":false},"author":87,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[4133,1726],"tags":[754,857],"class_list":["post-24931","post","type-post","status-publish","format-standard","hentry","category-database","category-mariadb","tag-switch","tag-switchover"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>MariaDB manual Switchover - dbi services | Blog<\/title>\n<meta name=\"description\" content=\"How to do a manual Switchover in a MariaDB HA setups using master-slave replication\" \/>\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.dbi-services.com\/blog\/mariadb-manual-switchover\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MariaDB manual Switchover\" \/>\n<meta property=\"og:description\" content=\"How to do a manual Switchover in a MariaDB HA setups using master-slave replication\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/mariadb-manual-switchover\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi services | Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/dbiservices\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-03T13:58:53+00:00\" \/>\n<meta name=\"author\" content=\"Joan Frey\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@dbiservices\" \/>\n<meta name=\"twitter:site\" content=\"@dbiservices\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Joan Frey\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/mariadb-manual-switchover\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/mariadb-manual-switchover\\\/\"},\"author\":{\"name\":\"Joan Frey\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#\\\/schema\\\/person\\\/565fa40326c9a1329bcf424186e01a04\"},\"headline\":\"MariaDB manual Switchover\",\"datePublished\":\"2023-05-03T13:58:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/mariadb-manual-switchover\\\/\"},\"wordCount\":249,\"commentCount\":2,\"publisher\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#organization\"},\"keywords\":[\"SWITCH\",\"switchover\"],\"articleSection\":[\"Database\",\"MariaDB\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/mariadb-manual-switchover\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/mariadb-manual-switchover\\\/\",\"url\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/mariadb-manual-switchover\\\/\",\"name\":\"MariaDB manual Switchover - 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