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Hello Kubernetes ​

A Hello World web app in plain Python, for trying out a deployment or debugging requests inside a cluster. Its page shows a configurable hello text (HELLO_TEXT), the pod's namespace, service account, pod and node names and IP addresses, and a fixed set of request headers such as Host, User-Agent and X-Forwarded-For. /headers returns every request header as plain text.

registry.gitlab.com/hosstio/docker-images/hello-kubernetes/main:latest

Source: hosstio/docker-images/hello-kubernetes

Run ​

shell
docker run --interactive --tty --publish 8000:8000 registry.gitlab.com/hosstio/docker-images/hello-kubernetes/main:latest

Browse to http://127.0.0.1:8000. Set HELLO_TEXT to change the hello text:

shell
docker run --interactive --tty --publish 8000:8000 --env HELLO_TEXT="Foobar!" registry.gitlab.com/hosstio/docker-images/hello-kubernetes/main:latest

The Kubernetes values come from downward API environment variables. Under docker run those fields show their placeholders, like ${KUBERNETES_NAMESPACE}.

Deploy ​

The repository's kubernetes.yaml sets those environment variables:

shell
kubectl apply --filename kubernetes.yaml