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

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

Establishing a High-Availability MySQL Cluster with Orchestrator

For mission-critical applications like WooCommerce, a single MySQL instance is a single point of failure. Architecting for high availability (HA) necessitates a robust failover strategy. We’ll leverage Orchestrator, a popular MySQL replication topology manager, to automate this process. Orchestrator monitors replication health and can automatically promote a replica to a primary in case of failure.

Our setup will involve at least two MySQL nodes (a primary and a replica) and a separate Orchestrator instance. For simplicity, we’ll assume a basic topology. In a production environment, you’d want multiple Orchestrator instances for their own HA and potentially more MySQL nodes for read scaling and redundancy.

Orchestrator Installation and Configuration

Orchestrator can be installed from source or via pre-built packages. For this example, we’ll assume a Debian/Ubuntu-based system. The configuration file, typically /etc/orchestrator/orchestrator.conf.json, is crucial.

Key configuration parameters include:

  • MySQLTopologyUser and MySQLTopologyPassword: Credentials for Orchestrator to connect to MySQL instances. These users need sufficient privileges (e.g., REPLICATION SLAVE, REPLICATION CLIENT, SELECT).
  • DiscoveryPollSeconds: How often Orchestrator scans the topology.
  • FailureDetectionPeriodSeconds: How long a failure must persist before triggering an action.
  • PromotionRule: Defines the logic for promoting a replica (e.g., ‘prefer-most-recent-master-check’).
  • ListenAddress: The IP address Orchestrator listens on.
  • HTTPPort: The port for the Orchestrator web UI and API.
  • MySQLOrchestratorHostPort: The host and port of the MySQL instance Orchestrator itself connects to for topology discovery (often a dedicated user or the primary).

Here’s a sample orchestrator.conf.json:

Ensure the orchestrator user has the necessary MySQL privileges. You can create this user and grant permissions like so:

-- On each MySQL node:
CREATE USER 'orchestrator'@'%' IDENTIFIED BY 'your_secure_password';
GRANT REPLICATION SLAVE, REPLICATION CLIENT, SELECT ON *.* TO 'orchestrator'@'%';
FLUSH PRIVILEGES;
{
  "Debug": true,
  "ListenAddress": "0.0.0.0",
  "HTTPPort": 8080,
  "MySQLTopologyUser": "orchestrator",
  "MySQLTopologyPassword": "your_secure_password",
  "MySQLOrchestratorHostPort": "127.0.0.1:3306",
  "DiscoveryPollSeconds": 10,
  "FailureDetectionPeriodSeconds": 30,
  "PromotionRule": "prefer-most-recent-master-check",
  "RecoveryPeriodBlockSeconds": 3600,
  "DetectClusterAlias": true,
  "SlaveLagQuery": "SELECT * FROM mysql.slave_replica_status WHERE ServerId = ?",
  "SlaveLagQueryIntervalSeconds": 5,
  "GlobalWriteRecoveryPeriodBlockSeconds": 3600,
  "AutoOrchestrateOnFailure": true,
  "PostUnsuccessfulFailoverProcesses": [
    "discover"
  ],
  "PostSuccessfulFailoverProcesses": [
    "discover"
  ],
  "PrePromotionProcesses": [],
  "PostPromotionProcesses": [
    "discover"
  ],
  "PreFailoverProcesses": [],
  "PostFailoverProcesses": [
    "discover"
  ],
  "PostRelocationProcesses": [
    "discover"
  ],
  "PostUnsuccessfulRecoveryProcesses": [
    "discover"
  ],
  "PostSuccessfulRecoveryProcesses": [
    "discover"
  ],
  "PostRelocationProcesses": [
    "discover"
  ],
  "MySQLBinlogPlayerHostPort": "127.0.0.1:3306",
  "MySQLBinlogPlayerUser": "orchestrator",
  "MySQLBinlogPlayerPassword": "your_secure_password",
  "MySQLBinlogPlayerPort": 3306,
  "MySQLBinlogPlayerDatabase": "mysql",
  "MySQLBinlogPlayerTable": "binlog_player",
  "MySQLBinlogPlayerSlaveIdOffset": 1000000,
  "MySQLBinlogPlayerSlaveIdIncrement": 1,
  "MySQLBinlogPlayerSlaveIdMax": 2000000,
  "MySQLBinlogPlayerSlaveIdPoolSize": 100,
  "MySQLBinlogPlayerSlaveIdPoolRefreshSeconds": 300,
  "MySQLBinlogPlayerSlaveIdPoolRefreshMaxAttempts": 5,
  "MySQLBinlogPlayerSlaveIdPoolRefreshRetryIntervalSeconds": 10,
  "MySQLBinlogPlayerSlaveIdPoolRefreshTimeoutSeconds": 60,
  "MySQLBinlogPlayerSlaveIdPoolRefreshMaxTimeoutSeconds": 300,
  "MySQLBinlogPlayerSlaveIdPoolRefreshMaxRetryIntervalSeconds": 60,
  "MySQLBinlogPlayerSlaveIdPoolRefreshMaxRetryAttempts": 10,
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