Health checks

Instance health checks

  • System: network, power, hardware issues (AWS problem)
  • Instance: Incorrect configuration, out of memory, corrupted file system (our problem)

Target group health checks

  • Come from the load balancer
  • Pings an endpoint

WTF is a target group

A grouping of apps that will receive load balanced traffic

  • Healthy threshold: if you're unhealthy, the number of consecutive healthy checks needed to be healthy.
  • Unhealthy: the opposite
  • Timeout: how long the check waits
  • Interval: how long to wait between checks
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