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Out setup is multiple Front Ends (replicated) and 2 Backend MYSQL servers (Master-Master replication).

We're looking to achieve HA automatic failover for wordpress. We've got the front ends covered through replication and a load balancer.

Any ideas on how to achieve AUTOMATIC MySQL failover?

Thanks in advance.

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You can achieve automatic failover using a synchronous service, like Galera cluster.

It requires three nodes, but you can set up two nodes there, along with an arbitrator.

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We use MariaDB Galera Replication for ensuring high availability of our WordPress Enterprise solution. Load balancing and automatic failover can be achieved with a help of DNS round robin (assigning multiple IP addresses of database instances to one hostname) or with a help of ProxySQL (or MaxScale) placed in front of database cluster.

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