Configure MySQL GTID-based replication and perform a failover
domain: mysql · 6 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps
On all servers add to my.cnf: gtid_mode=ON, enforce_gtid_consistency=ON, server_id=<unique>, log_bin=ON, binlog_format=ROW; restart each node
Create a replication user with REPLICATION SLAVE privilege; store the password in MySQL's credential store or a .mylogin.cnf file, not in the CHANGE MASTER statement
On the replica run: CHANGE MASTER TO MASTER_HOST='primary-host', MASTER_USER='repl', MASTER_AUTO_POSITION=1; then START SLAVE
Verify replication: SHOW SLAVE STATUS\G — check Seconds_Behind_Master and that both Retrieved and Executed GTID sets are consistent
For failover, stop writes on the old primary, wait for replica's Executed_Gtid_Set to match, then on the replica run STOP SLAVE; RESET SLAVE ALL; and promote it by pointing the application to the new primary
Update gtid_purged on any remaining replicas if they need to follow the new primary with gaps in the GTID sequence
Known gotchas
gtid_mode can only be changed one step at a time (OFF → OFF_PERMISSIVE → ON_PERMISSIVE → ON); enforce_gtid_consistency must be ON before setting gtid_mode=ON
Statements that are unsafe for GTIDs (CREATE TABLE ... SELECT, non-transactional updates inside transactions) will be blocked when enforce_gtid_consistency=ON — audit application code before enabling
After failover, do not restart the old primary without first resetting its binary log or it may generate GTIDs that conflict with the new primary
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