k8s-podinfo

Podinfo is a tiny web application made with Go that showcases best practices of running microservices in Kubernetes.

Specifications:

Release automation (Make/TravisCI/CircleCI/Quay.io/Google Cloud Container Builder/Skaffold/Weave Flux)
Multi-platform Docker image (amd64/arm/arm64/ppc64le/s390x)
Health checks (readiness and liveness)
Graceful shutdown on interrupt signals
File watcher for secrets and configmaps
Instrumented with Prometheus
Tracing with Istio and Jaeger
Structured logging with zap
12-factor app with viper
Fault injection (random errors and latency)
Helm chart

Web API:

GET / prints runtime information
GET /version prints podinfo version and git commit hash
GET /metrics return HTTP requests duration and Go runtime metrics
GET /healthz used by Kubernetes liveness probe
GET /readyz used by Kubernetes readiness probe
POST /readyz/enable signals the Kubernetes LB that this instance is ready to receive traffic
POST /readyz/disable signals the Kubernetes LB to stop sending requests to this instance
GET /status/{code} returns the status code
GET /panic crashes the process with exit code 255
POST /echo forwards the call to the backend service and echos the posted content
GET /env returns the environment variables as a JSON array
GET /headers returns a JSON with the request HTTP headers
GET /delay/{seconds} waits for the specified period
POST /token issues a JWT token valid for one minute JWT=$(curl -sd 'anon' podinfo:9898/token | jq -r .token)
GET /token/validate validates the JWT token curl -H "Authorization: Bearer $JWT" podinfo:9898/token/validate
GET /configs returns a JSON with configmaps and/or secrets mounted in the config volume
POST /write writes the posted content to disk at /data/hash and returns the SHA1 hash of the content
GET /read/{hash} returns the content of the file /data/hash if exists
GET /ws/echo echos content via websockets podcli ws ws://localhost:9898/ws/echo

linuxbsdfreak/k8s-podinfo