670,000 KRW informational until enrollment confirms
Program narrative
Labs bounce traffic between healthy and poisoned upstreams while you tune intervals that do not lie. We rehearse the moment when the load balancer and nginx disagree.
What the labs include
Active vs passive health checks tradeoffs
max_fails and fail_timeout math on paper first
Sticky session hazards with honest warnings
Slow start patterns for cold JVMs
Access log fields that prove behavior
Canary header routing exercise
Post-change verification script
Outcomes you can show a lead
Tune probes that catch real failures, not trivia
Explain why sticky sessions complicate healing
Capture logs that settle arguments quickly
Straight FAQ
Envoy or HAProxy?
Compared in discussion; nginx remains the hands-on surface.
TLS termination?
Covered at a config level; certificate procurement is yours.
Limitations?
gRPC specifics are not exercised in labs.
Recent participant notes
“Canary header exercise mirrored our blue/green debates. Still sorting slow start for JVMs, but probes finally match reality.”
Client in manufacturing
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