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You are monitoring service health using Consul and want to ensure that a service is automatically removed from the catalog if it remains in a 'critical' state for more than 24 hours. Which configuration key supports this?
The deregister_critical_service_after setting in a Consul service definition tells Consul to automatically deregister a service instance if its health check remains in the critical state for longer than the specified duration (e.g., '24h'). This is exactly the built-in mechanism …Read full explanation
A service has a TTL check configured with a 30-second TTL. If the application crashes and stops sending heartbeats, when will the service status change to 'critical'?
A TTL check in Consul marks the service as critical when the TTL interval elapses without a heartbeat update. Since the TTL is set to 30 seconds, the check will transition to critical exactly 30 seconds after the last successful heartbeat. The application crashing means no furthe…Read full explanation
When defining a TCP health check, what is the primary indicator that the check is 'passing'?
For a TCP health check, Consul considers the check passing if it can successfully establish a TCP connection to the specified port. This is indicated by a successful TCP handshake (SYN, SYN-ACK, ACK). No application-level response is required.
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