{"id":2116,"date":"2018-08-23T10:14:35","date_gmt":"2018-08-23T10:14:35","guid":{"rendered":"http:\/\/dbtut.com\/?p=2116"},"modified":"2018-11-18T20:40:37","modified_gmt":"2018-11-18T20:40:37","slug":"mysql-master-master-replication","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/08\/23\/mysql-master-master-replication\/","title":{"rendered":"MySQL master-master replication"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p><strong>Master-Master Replication setup<\/strong><\/p>\n<p>Replication makes data highly available for applications and websites, master-master replication is an active-active cluster kind of solution which can be useful to load balance reads and writes. If we have only two nodes, then master-master replication is a good option.<\/p>\n<p>&nbsp;<\/p>\n<p>Consider these two servers for reference<\/p>\n<pre class=\"lang:default decode:true \">Master1\/Slave2 -\u00a0 A.A.A.A(IP address)\r\n\r\nMaster2\/Slave1 -\u00a0 B.B.B.B(IP address)<\/pre>\n<p>&nbsp;<\/p>\n<p>MySQL should be installed on both servers to setup master-master replication.<\/p>\n<p><b>Step 1<\/b><strong>: Add these options in my.cnf of master1\/slave2<\/strong><\/p>\n<pre class=\"lang:default decode:true \">server-id=104\r\n\r\nlog-bin=mysql-bin\r\n\r\nrelay-log=relay-bin\r\n\r\nsync_binlog = 1\r\n\r\nrelay-log-info-repository = TABLE\r\n\r\nrelay_log_purge = 1\r\n\r\nlog-slave-updates\r\n\r\nauto_increment_increment = 2\r\n\r\nauto_increment_offset = 1<\/pre>\n<p>&nbsp;<\/p>\n<p>Restart mysql service in master1<\/p>\n<pre class=\"lang:default decode:true \">service mysql restart\u00a0 \u00a0\u00a0or \u00a0\u00a0\u00a0\u00a0\/etc\/init.d\/mysql restart<\/pre>\n<p>&nbsp;<\/p>\n<p>server_id should be an unique number in the replication setup, auto_increment is used to avoid conflicts in data inserts, log-bin to enable binlog , relay-log to enable relay binlog, sync_binlog to avoid data loss or maintain consistency, \u00a0relay-log-info-repository to store binlog file position details in a table, relay_log_purge to purge relay-binlog after applying sql in slave.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Step 2: Add these options in my.cnf of Master2\/Slave1<\/strong><\/p>\n<pre class=\"lang:default decode:true \">server-id=105\r\n\r\nlog-bin=mysql-bin\r\n\r\nrelay-log=relay-bin\r\n\r\nsync_binlog = 1\r\n\r\nrelay-log-info-repository = TABLE\r\n\r\nrelay_log_purge = 1\r\n\r\nlog-slave-updates\r\n\r\nauto_increment_increment = 2\r\n\r\nauto_increment_offset = 2<\/pre>\n<p>&nbsp;<\/p>\n<p>Restart the mysql server in master2<\/p>\n<pre class=\"lang:default decode:true \">service mysql restart\u00a0 \u00a0\u00a0or \u00a0\u00a0\u00a0\u00a0\/etc\/init.d\/mysql restart<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Step3: \u00a0Create user for slave2 in Master1 DB<\/strong><\/p>\n<pre class=\"lang:default decode:true \">create user 'user_name1'@'B.B.B.B' identified by 'your_password1';\r\n\r\ngrant replication slave on *.* to\u00a0 'user_name1'@'B.B.B.B' identified by 'your_password1'; ;\r\n\r\nflush privileges;<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Step 4: \u00a0Create user for slave1 in Master2 DB<\/strong><\/p>\n<pre class=\"lang:default decode:true \">create user 'user_name2'@'A.A.A.A' identified by 'your_password2';\r\n\r\ngrant replication slave on *.* to\u00a0 'user_name2'@'A.A.A.A' identified by 'your_password2';\r\n\r\nflush privileges;<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Step 5: Make note of binlog file and position in Master1<\/strong><\/p>\n<pre class=\"lang:default decode:true\">mysql&gt; show master status;<\/pre>\n<p>use this noted file and position in next step.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Step6: Update replication user, master info and binlog position in Slave1 (B.B.B.B)<\/strong><\/p>\n<pre class=\"lang:default decode:true \">stop slave;\r\n\r\nCHANGE MASTER TO MASTER_HOST='A.A.A.A', MASTER_USER='user_name1', MASTER_PASSWORD='your_password1', MASTER_LOG_FILE='mysql-bin.000003', MASTER_LOG_POS=702;<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Step7: Start slave and check the replication in slave1 server<\/strong><\/p>\n<pre class=\"lang:default decode:true\">start slave;\r\nshow slave status\\G<\/pre>\n<p>Both I\/O and SQL thread should be running.<\/p>\n<p>check replication by doing table update in master1<\/p>\n<p>If replication is working fine from Master1-Slave1, then go to next step<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Step8: Make note of binlog file and position in Master2<\/strong><\/p>\n<pre class=\"lang:default decode:true\">mysql&gt; show master status;<\/pre>\n<p>use this noted file and position in next step.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Step9: Update replication user, master info and binlog position in Slave2 (A.A.A.A)<\/strong><\/p>\n<pre class=\"lang:default decode:true \">stop slave;\r\n\r\nCHANGE MASTER TO MASTER_HOST='B.B.B.B', MASTER_USER='user_name2', MASTER_PASSWORD='your_password2', MASTER_LOG_FILE='mysql-bin.000003', MASTER_LOG_POS=702;<\/pre>\n<p>&nbsp;<\/p>\n<p><strong>Step10: Start slave and check the replication in slave2 server<\/strong><\/p>\n<pre class=\"lang:default decode:true\">start slave;\r\n\r\nshow slave status\\G<\/pre>\n<p>Both I\/O and SQL thread should be running.<\/p>\n<p>check replication by doing table update in master2<\/p>\n<p>If replication is working fine from Master2-Slave2, then master-master replication setup is complete.<\/p>\n\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_2116\" class=\"pvc_stats all  \" data-element-id=\"2116\" 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; Master-Master Replication setup Replication makes data highly available for applications and websites, master-master replication is an active-active cluster kind of solution which can be useful to load balance reads and writes. If we have only two nodes, then master-master replication is a good option. &nbsp; Consider these two servers for reference Master1\/Slave2 &#8211;\u00a0 A.A.A.A(IP &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_2116\" class=\"pvc_stats all  \" data-element-id=\"2116\" 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":126,"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":[7],"tags":[1427,1301,1415],"class_list":["post-2116","post","type-post","status-publish","format-standard","","category-mysql","tag-master-master-replication","tag-mysql","tag-mysql-replication"],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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