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Home » Disaster Recovery 101: Architecting Auto-Failovers for MySQL and WordPress Deployments on DigitalOcean

Disaster Recovery 101: Architecting Auto-Failovers for MySQL and WordPress Deployments on DigitalOcean

Establishing a Highly Available MySQL Cluster with Orchestrator

For WordPress deployments, a robust and highly available MySQL database is paramount. We’ll architect an automated failover solution using Orchestrator, a popular open-source tool for MySQL replication management and high availability. This approach leverages MySQL’s built-in replication and Orchestrator’s intelligence to detect failures and promote replicas to masters automatically.

Our setup will involve at least three MySQL instances running on DigitalOcean Droplets. One will be the primary (master), and the others will be replicas. Orchestrator will monitor these instances. In the event of a master failure, Orchestrator will promote one of the replicas to become the new master and reconfigure the remaining replicas to follow the new master.

Orchestrator Installation and Configuration

We’ll install Orchestrator on a dedicated Droplet or one of the MySQL nodes (though a separate node is recommended for true HA). For simplicity in this example, we’ll assume it’s installed on a separate Droplet.

First, ensure your MySQL instances are set up with standard replication. Each replica should have a unique `server-id` and be configured to replicate from the master using `CHANGE MASTER TO` statements. Orchestrator will manage these configurations going forward, but the initial setup is crucial.

Install Orchestrator on your chosen Droplet. The installation process varies by OS, but for Ubuntu/Debian, you can often use a pre-built package or compile from source. Here’s a typical installation using `wget` and `dpkg` (adjust version as needed):

wget https://github.com/openark/orchestrator/releases/download/v3.2.10/orchestrator_3.2.10_linux_amd64.deb
sudo dpkg -i orchestrator_3.2.10_linux_amd64.deb

Next, configure Orchestrator. The primary configuration file is typically located at `/etc/orchestrator/orchestrator.conf.json`. We need to define how Orchestrator connects to MySQL and its own backend database (which can be another MySQL instance or even SQLite for testing, but a dedicated MySQL instance is recommended for production).

{
    "Debug": false,
    "ListenAddress": ":3000",
    "MySQLTopologyUser": "orchestrator",
    "MySQLTopologyPassword": "your_orchestrator_db_password",
    "MySQLOrchestratorHost": "127.0.0.1",
    "MySQLOrchestratorPort": 3306,
    "MySQLOrchestratorDatabase": "orchestrator",
    "MySQLOrchestratorUser": "orchestrator",
    "MySQLOrchestratorPassword": "your_orchestrator_db_password",
    "DiscoveryPeriodSeconds": 10,
    "PromotionPollSeconds": 10,
    "DetectClusterPeriodSeconds": 10,
    "FailureDetectionPeriodSeconds": 5,
    "RecoveryPeriodSeconds": 10,
    "AutoDiscoverOnStart": true,
    "TopologyRefreshSeconds": 30,
    "SlaveLagQuery": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryError": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveRunning": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterRunning": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterHost": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterPort": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterUser": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterPassword": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterUUID": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterLogFile": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterLogPos": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveIOState": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveSQLState": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveSecondsBehindMaster": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveSQLThreadRunning": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveIOThreadRunning": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterServerID": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveServerID": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterVersion": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveVersion": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterBinlogFormat": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveBinlogFormat": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterBinlogRowImage": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveBinlogRowImage": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterGTIDEnabled": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveGTIDEnabled": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterAutoIncrementIncrement": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQuerySlaveAutoIncrementIncrement": "SELECT * FROM mysql.slave_replica_status",
    "SlaveLagQueryMasterAutoIncrementOffset": "SELECT * FROM mysql.slave_replica_status",
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    "SlaveLagQueryMasterAutoIncrementMaxValue": "SELECT * FROM mysql.slave_replica_status",
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    "SlaveLagQueryMasterAutoIncrementCurrentValue": "SELECT * FROM mysql.slave_replica_status",
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    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQueryMasterAutoIncrementReservedValueMax": "SELECT * FROM mysql.replica_status",
    "SlaveLagQuerySlaveAutoIncrementReservedValueMax":

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