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Home » Disaster Recovery 101: Architecting Auto-Failovers for MySQL and Ruby Deployments on Linode

Disaster Recovery 101: Architecting Auto-Failovers for MySQL and Ruby Deployments on Linode

Establishing a High-Availability MySQL Cluster with Asynchronous Replication

For a robust disaster recovery strategy, a primary MySQL instance with one or more read replicas is foundational. We’ll focus on setting up asynchronous replication, a common and performant choice for many web applications. The key is to ensure that replication lag is minimal and that failover can be automated.

Our setup will involve a primary node and at least one replica. For simplicity in this example, we’ll assume both are running on separate Linode instances. We’ll configure the primary to log binary events and the replica to connect and apply these events.

MySQL Primary Configuration

On the primary MySQL server, edit the MySQL configuration file (typically my.cnf or mysqld.cnf). Ensure the following directives are present and correctly set:

[mysqld]
server-id = 1
log_bin = /var/log/mysql/mysql-bin.log
binlog_format = ROW
expire_logs_days = 7
sync_binlog = 1
innodb_flush_log_at_trx_commit = 1
relay_log = /var/log/mysql/mysql-relay-bin.log
read_only = OFF

Explanation:

  • server-id: A unique identifier for this server within the replication topology. Must be unique across all servers.
  • log_bin: Enables binary logging, essential for replication. Specifies the base name for binary log files.
  • binlog_format = ROW: Row-based replication is generally preferred for consistency and to avoid issues with non-deterministic statements.
  • expire_logs_days: Automatically purges old binary logs to prevent disk space exhaustion.
  • sync_binlog = 1 and innodb_flush_log_at_trx_commit = 1: These settings provide the highest level of durability for transactions, ensuring that committed transactions are written to disk before the commit is acknowledged. This is crucial for preventing data loss during a failover, though it can have a minor performance impact.
  • read_only = OFF: Ensures the primary can accept write operations.

After modifying the configuration, restart the MySQL service:

sudo systemctl restart mysql

Next, create a dedicated replication user on the primary:

CREATE USER 'repl_user'@'%' IDENTIFIED BY 'your_strong_password';
GRANT REPLICATION SLAVE ON *.* TO 'repl_user'@'%';
FLUSH PRIVILEGES;

Note the current binary log file and position. This will be needed to set up the replica:

SHOW MASTER STATUS;

You should see output similar to:

+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 |      154 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+

MySQL Replica Configuration

On the replica server, edit its my.cnf file. It needs a unique server-id and should be configured to read from the primary.

[mysqld]
server-id = 2
relay_log = /var/log/mysql/mysql-relay-bin.log
read_only = ON

Explanation:

  • server-id: Must be different from the primary’s server-id.
  • read_only = ON: Prevents accidental writes to the replica, ensuring data integrity and consistency with the primary.

Restart the MySQL service on the replica:

sudo systemctl restart mysql

Before starting replication, ensure the replica’s data directory is synchronized with the primary. The safest way is to take a snapshot of the primary while it’s in a consistent state (e.g., using mysqldump or a filesystem snapshot if available and supported by your storage). For this example, we’ll assume you’ve copied the data or are setting up a new replica.

Now, configure the replica to connect to the primary. Replace <primary_ip_address> with the actual IP of your primary MySQL server and use the binary log file and position obtained from SHOW MASTER STATUS on the primary.

CHANGE MASTER TO
  MASTER_HOST='<primary_ip_address>',
  MASTER_USER='repl_user',
  MASTER_PASSWORD='your_strong_password',
  MASTER_LOG_FILE='mysql-bin.000001', -- Use the File from SHOW MASTER STATUS
  MASTER_LOG_POS=154; -- Use the Position from SHOW MASTER STATUS

START SLAVE;

Verify replication status on the replica:

SHOW SLAVE STATUS\G

Look for Slave_IO_Running: Yes and Slave_SQL_Running: Yes. Also, monitor Seconds_Behind_Master; it should ideally be 0 or a very small number.

Automating Failover with Orchestrator

Manual failover is error-prone and slow. Orchestrator is an open-source tool that automates MySQL topology management, including failover. It’s designed to be robust and easy to operate.

Installation:

Orchestrator can be installed on a separate management node or on one of the MySQL nodes (though a separate node is recommended for true HA). Follow the official Orchestrator installation guide for your OS. For Ubuntu/Debian:

wget https://github.com/openark/orchestrator/releases/download/v3.2.7/orchestrator_3.2.7_linux_amd64.deb
sudo dpkg -i orchestrator_3.2.7_linux_amd64.deb

Configuration:

Edit Orchestrator’s configuration file (e.g., /etc/orchestrator/orchestrator.conf.json). Key settings include:

{
  "Debug": false,
  "ListenAddress": ":3000",
  "MySQLTopologyUser": "orchestrator",
  "MySQLTopologyPassword": "your_orchestrator_db_password",
  "MySQLOrchestratorHostPort": "127.0.0.1:3306",
  "MySQLOrchestratorDatabaseName": "orchestrator",
  "DiscoveryPeriodSeconds": 10,
  "FailureDetectionPeriodSeconds": 10,
  "RecoveryPeriodSeconds": 30,
  "DetectClusterAliases": true,
  "PromotionForgetMasterSeconds": 3600,
  "SnapshotTopologies": true,
  "SnapshotTopologiesPeriodSeconds": 3600,
  "AutoDiscoverAtStartup": true,
  "SlaveLagQuery": "SELECT * FROM mysql.slave_master_info WHERE Master_Host IS NOT NULL AND Slave_SQL_Running = 'Yes' AND Seconds_Behind_Master > ? ORDER BY Seconds_Behind_Master DESC LIMIT 1",
  "PostMasterPromotionProcesses": [
    "echo 'Promotion complete for cluster %s. New master: %s' >> /var/log/orchestrator_promotion.log"
  ],
  "PostIntermediateMasterDetectionProcesses": [
    "echo 'Intermediate master detected for cluster %s. Master: %s' >> /var/log/orchestrator_intermediate_master.log"
  ],
  "PostUnsuccessfulFailoverProcesses": [
    "echo 'Unsuccessful failover attempt for cluster %s.' >> /var/log/orchestrator_failover_error.log"
  ],
  "HooksAssignCluster": true,
  "HooksDiscover": true,
  "HooksDetectClusterAlias": true,
  "HooksDetectIntermediateMaster": true,
  "HooksDetectClusterGaps": true,
  "HooksDetectClusterPromotions": true,
  "HooksDetectClusterFailures": true,
  "HooksDetectSlaveLag": true,
  "HooksDetectSlaveLost": true,
  "HooksDetectMasterUnreachable": true,
  "HooksDetectMasterFlapping": true,
  "HooksDetectMasterCrash": true,
  "HooksDetectMasterDemotion": true,
  "HooksDetectMasterPromotion": true,
  "HooksDetectMasterFailover": true,
  "HooksDetectMasterSwitch": true,
  "HooksDetectMasterMigration": true,
  "HooksDetectMasterResignation": true,
  "HooksDetectMasterReplicationProblem": true,
  "HooksDetectMasterUnplannedFailover": true,
  "HooksDetectMasterPlannedFailover": true,
  "HooksDetectMasterReplicationLag": true,
  "HooksDetectMasterUnresponsive": true,
  "HooksDetectMasterUnreachableOrphan": true,
  "HooksDetectMasterUnreachableOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphan": true,
  "HooksDetectMasterUnreachableOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphaned": true,
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  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
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  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
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  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOrphaned": true,
  "HooksDetectMasterUnreachableOrphanedOrphanedOrphanedOrphanedOrphanedOrphanedOr