Docker Health Check: Syntax, Compose, and Gotchas
A docker health check tells the daemon whether your container can still serve. Here is the syntax, the Compose ordering trick, and what it cannot see.
#health-checks
35 posts tagged "Health Checks".
Port Monitoring: Check TCP and UDP Services
Port monitoring tells you a listener answered on host and port. Here is what that proves, what it does not, and which ports deserve a check.
Keyword Monitoring: Catch Broken Pages Returning 200
Keyword monitoring checks that a phrase is still in your HTML, so you catch the broken page that keeps answering with a healthy 200 status.
Heartbeat Monitoring: Catch Jobs That Never Ran
Heartbeat monitoring waits for your cron job to check in, then alerts when the signal never arrives. Here is how to size the grace period.
Blackbox Monitoring: What the Outside View Sees
Blackbox monitoring tests a service from outside with no access to its internals, which is how you catch DNS, TLS and routing failures.