{"id":32438,"date":"2024-05-15T13:55:59","date_gmt":"2024-05-15T11:55:59","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/?p=32438"},"modified":"2024-05-22T09:08:41","modified_gmt":"2024-05-22T07:08:41","slug":"mariadb-repair-replication-through-db-restore","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/mariadb-repair-replication-through-db-restore\/","title":{"rendered":"MariaDB &#8211; Repair Replication Through DB Restore (mysqldump)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-introduction\">Introduction<\/h2>\n\n\n\n<p>Maintaining database replication integrity is paramount for businesses relying on databases. Replication ensures that changes made on the master database are reliably propagated to replica databases, guaranteeing data consistency and availability across the system. In this comprehensive guide, we&#8217;ll dive into the process of restoring a MariaDB database and repairing replication, in the context of a &#8220;last hope&#8221; solution.<br>These steps are essential for safeguarding data integrity, ensuring disaster recovery readiness, and maintaining high availability in distributed database environments.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-prerequisites\">Prerequisites<\/h2>\n\n\n\n<p>Before embarking on the restoration and replication repair journey, it&#8217;s essential to ensure you have everything in place:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Access to the MariaDB server with appropriate privileges.<\/li>\n\n\n\n<li>Basic understanding of SQL commands for database management.<\/li>\n\n\n\n<li>A recent backup of your MariaDB database made with mysqldump, crucial for data restoration. In this blog, I will use a dump of my troublesome database, that I did previously. The dump has to be made using the option &#8220;&#8211;master-data&#8221; &#8220;which automatically appends the&nbsp;<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/5.7\/en\/change-master-to.html\"><code>CHANGE MASTER TO<\/code><\/a>&nbsp;statement required on the replica to start the replication process&#8221;.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-1-stop-the-slave\">Step 1: Stop the Slave<\/h2>\n\n\n\n<p>Replication must be halted before initiating any restoration activities to prevent potential data inconsistencies. By stopping the slave, we ensure that no new changes are applied to the replica databases during the restoration process, maintaining data integrity.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nroot@srv2:~# mysql\nMariaDB &#x5B;(none)]&gt; stop slave;\nMariaDB &#x5B;(none)]&gt; show slave status\\G \n*************************** 1. row *************************** \nSlave_IO_State: \nMaster_Host: 10.x.x.x \nMaster_User: replication_user \nMaster_Port: 3306 \nConnect_Retry: 60 \nMaster_Log_File: mariadb-bin.170722 \nRead_Master_Log_Pos: 103504747 \nRelay_Log_File: relay-bin.001548 \nRelay_Log_Pos: 103505048 \nRelay_Master_Log_File: mariadb-bin.170722 \n&lt;mark class=&quot;has-inline-color has-vivid-red-color&quot;&gt;&lt;strong&gt;Slave_IO_Running: No \nSlave_SQL_Running: No &lt;\/strong&gt;&lt;\/mark&gt;\nReplicate_Do_DB: \nReplicate_Ignore_DB:\n<\/pre><\/div>\n\n\n<p><strong>Note:<\/strong> Checking the replication status before stopping the slave is a good practice to confirm that replication is active and needs to be stopped.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-2-prepare-for-restoration\">Step 2: Prepare for Restoration<\/h2>\n\n\n\n<p>Preparing for restoration involves navigating to the backup directory and stopping the MariaDB service. Additionally, deleting the target database directory ensures a clean slate for the restoration process, preventing conflicts or errors.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\nroot@srv1:~# ll \/backup\/SRV1\/2024-03-13\/ \n-rw-r--r-- 1 root root 97685528439 May 13 03:20 backup_2024-03-13 \nroot@srv1:~# cd \/backup\/SRV1\/2024-03-13\/\n\nroot@srv1:\/backup\/SRV1\/2024-03-13# systemctl stop mariadb.service \nroot@srv1:\/backup\/SRV1\/2024-03-13# mysql \nERROR 2002 (HY000): Can&#039;t connect to local MySQL server through socket &#039;\/var\/run\/mysqld\/mysqld.sock&#039; (2)\n\nroot@srv1:\/backup\/SRV1\/2024-03-13# rm -rf \/var\/lib\/mysql\/dbtest\/\n<\/pre><\/div>\n\n\n<p><strong>Note:<\/strong> Ensure that the backup directory contains the necessary backup files and that sufficient disk space is available before proceeding with the restoration. Instead of deleting the database directory, you can also drop the database from mysql prompt.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-3-restart-mariadb\">Step 3: Restart MariaDB<\/h2>\n\n\n\n<p>Once the preparation is complete, restart the MariaDB service to initiate the restoration process. It&#8217;s important to ensure that you&#8217;re connected to MariaDB from the backup directory to run the restore command later.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\nroot@srv1:\/backup\/SRV1\/2024-03-13# systemctl start mariadb.service \nroot@srv1:\/backup\/SRV1\/2024-03-13# mysql\n<\/pre><\/div>\n\n\n<p><strong>Note:<\/strong> After restarting MariaDB, verify that the service has started successfully and is accessible before proceeding with the restoration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-4-recreate-the-database\">Step 4: Recreate the Database<\/h2>\n\n\n\n<p>After restarting MariaDB, recreate the target database using the appropriate SQL command. Verifying the successful creation of the database ensures that the restoration process can proceed smoothly.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nMariaDB &#x5B;(none)]&gt; show databases;\n+--------------------+\n| Database           |\n+--------------------+\n| binlog             |\n| information_schema |\n| logs               |\n| mysql              |\n| performance_schema |\n| sys                |\n+--------------------+\n6 rows in set (0.002 sec)\n\nMariaDB &#x5B;(none)]&gt; create database dbtest;\nQuery OK, 1 row affected (0.000 sec)\n\nMariaDB &#x5B;(none)]&gt; show databases;\n+--------------------+\n| Database           |\n+--------------------+\n| binlog             |\n| information_schema |\n| logs               |\n| mysql              |\n| performance_schema |\n| dbtest             |\n| sys                |\n+--------------------+\n7 rows in set (0.000 sec)\n\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-5-proceed-with-the-restoration\">Step 5: Proceed with the Restoration<\/h2>\n\n\n\n<p>Connect to the newly created database to prepare for the restoration of data from the backup file. This step sets the stage for applying the backed-up data to the database schema.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nMariaDB &#x5B;(none)]&gt; use dbtest;\n<\/pre><\/div>\n\n\n<p>If replication was restarted when you started the mariadb service, it&#8217;s imperative to halt the slave again before proceeding further. This ensures that the restored data is not replicated until the process is completed.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nMariaDB &#x5B;dbtest]&gt; stop slave;\n<\/pre><\/div>\n\n\n<p>Initiate the restoration process by sourcing the backup file containing the database dump. Monitoring the progress of the restoration in a separate terminal window allows for real-time tracking of the restoration activities.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nMariaDB &#x5B;dbtest]&gt; source backup_2024-03-13;\n<\/pre><\/div>\n\n\n<p><strong>Note:<\/strong> Keep an eye on the restoration progress to ensure it completes successfully without any errors or interruptions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-6-apply-replication-configuration\">Step 6: Apply Replication Configuration<\/h2>\n\n\n\n<p>After the restore, search for and apply the replication configuration settings from the backup file to synchronize the replica databases with the master. This step is crucial for ensuring data consistency across the replication topology.<br>You can use the head command to find a similar line at the top of your dump:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nCHANGE MASTER TO MASTER_LOG_FILE=&#039;mariadb-bin.***, MASTER_LOG_POS=***;\n<\/pre><\/div>\n\n\n<p>Apply the command:.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nMariaDB &#x5B;dbtest]&gt; CHANGE MASTER TO MASTER_LOG_FILE=&#039;mariadb-bin.***, MASTER_LOG_POS=***;\n<\/pre><\/div>\n\n\n<p><strong>Note:<\/strong> The line will be present in your dump file only if you use the option &#8220;&#8211;master-data&#8221; to create the dump.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-7-start-replication\">Step 7: Start Replication<\/h2>\n\n\n\n<p>Once the restoration is complete and replication configuration is applied, restart the replication process. This allows data changes made on the master database to be propagated to the replica databases, ensuring synchronization.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nMariaDB &#x5B;dbtest]&gt; start slave;\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-step-8-verify-replication\">Step 8: Verify Replication<\/h2>\n\n\n\n<p>To ensure that replication is functioning correctly, verify the replication status. Monitoring parameters such as &#8220;Slave_IO_Running&#8221; and &#8220;Slave_SQL_Running&#8221; helps in identifying any issues and ensuring smooth replication operation. You can also control &#8220;second_behind_master&#8221; which is useful to know if the replica has catch up with the master. (&#8220;Difference between the timestamp logged on the master for the event that the replica is currently processing, and the current timestamp on the replica.&nbsp;&#8220;)<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\nMariaDB &#x5B;(none)]&gt; show slave status\\G\n*************************** 1. row ***************************\n               Slave_IO_State: \n                  Master_Host: 10.150.13.2\n                  Master_User: replication_user\n                  Master_Port: 3306\n                Connect_Retry: 60\n              Master_Log_File: mariadb-bin.***\n          Read_Master_Log_Pos: ********\n               Relay_Log_File: relay-bin.***\n                Relay_Log_Pos: ********\n        Relay_Master_Log_File: mariadb-bin.***\n            &lt;mark class=&quot;has-inline-color has-vivid-red-color&quot;&gt;&lt;strong&gt; Slave_IO_Running: Yes\n            Slave_SQL_Running: Yes&lt;\/strong&gt;&lt;\/mark&gt;\n              Replicate_Do_DB: \n          Replicate_Ignore_DB: \n... ...\n\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\">Conclusion<\/h2>\n\n\n\n<p>By carefully following these steps, you can fix issues with your MariaDB replication and make sure your data stays safe and your database works reliably. Keeping an eye on your database and doing regular backups will help you avoid problems and keep everything running smoothly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-useful-links\">Useful links<\/h2>\n\n\n\n<p><a href=\"https:\/\/mariadb.com\/kb\/en\/show-replica-status\/\">https:\/\/mariadb.com\/kb\/en\/show-replica-statu<\/a><a href=\"https:\/\/mariadb.com\/kb\/en\/show-replica-status\/\" target=\"_blank\" rel=\"noreferrer noopener\">s\/<\/a><br><a href=\"https:\/\/mariadb.com\/docs\/server\/ref\/mdb\/cli\/mariadb-dump\/master-data\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/mariadb.com\/docs\/server\/ref\/mdb\/cli\/mariadb-dump\/master-data\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Maintaining database replication integrity is paramount for businesses relying on databases. Replication ensures that changes made on the master database are reliably propagated to replica databases, guaranteeing data consistency and availability across the system. In this comprehensive guide, we&#8217;ll dive into the process of restoring a MariaDB database and repairing replication, in the context [&hellip;]<\/p>\n","protected":false},"author":87,"featured_media":33117,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[198],"tags":[141,3331,301],"type_dbi":[3328,3354,3330,3329],"class_list":["post-32438","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-management","tag-mariadb","tag-repair","tag-replication","type-mariadb","type-mysqldump","type-repair","type-replication"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>MariaDB - Repair Replication Through DB Restore (mysqldump) - dbi Blog<\/title>\n<meta name=\"description\" content=\"Learn how to restore a MariaDB database and repair replication issues step-by-step. 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