Cloud Zone Emulator -

docker exec server-a ping 10.10.2.10 # sees ~50ms delay You now have a basic two-zone cloud emulator. Use Toxiproxy or Comcast (network fault injection):

# Run Toxiproxy as sidecar to each service docker run -p 8474:8474 shopify/toxiproxy Create a proxy for cross-zone traffic and toggle latency/outage: cloud zone emulator