[v18] disable mysql health check#58331
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GavinFrazar merged 2 commits intobranch/v18from Aug 26, 2025
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MySQL automatically blocks remote clients that fail to handshake. Every TCP health check is counted as a failed handshake, eventually leading to the database blocking the Teleport database agent. MySQL's automatic host blocking feature can be effectively disabled by setting max_connect_errors to a very large value, but to avoid triggering service outages we should disable MySQL health checks by default. For now, an env var TELEPORT_ENABLE_MYSQL_DB_HEALTH_CHECKS can be set on the Teleport database service to enable MySQL health checks again.
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Backports #58277 to branch/v18.
Changelog: Disabled MySQL database health checks to avoid MySQL blocking the Teleport Database Service for too many connection errors. MySQL health checks can be re-enabled by setting max_connect_errors on MySQL to its maximum value and setting the environment variable TELEPORT_ENABLE_MYSQL_DB_HEALTH_CHECKS=1 on the Teleport Database Service instance.