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The

testcontainers/ryuk:0.8.1

runs inside kubernetes, so the

127.0.0.1

refers to the pod that runs the test container, not the macOS machine.

127.0.0.1:32803

is how you, from your laptop, outside kubernetes can access the postgres container. The test container needs to call the postgres service name as a hostname and the postgres service port as port, not the NodePort