01 / THE ROLE
In this lab.
Traefik provides the common HTTPS entry layer for many web interfaces. Routes and backend services are described in configuration, allowing a friendly service name to reach an application without exposing its internal address in the public documentation.
02 / THE CONNECTIONS
Follow the flow.
A responsibility view: branches show related components, rather than physical placement or a single request path.
03 / How it works
How it works.
A router matches an incoming request and selects a configured service. Middleware can apply request handling or access boundaries; a service defines the backend destination. The lab uses file-based configuration for its proxy routes. A service URL and its backend destination are deliberately separate concepts.
04 / Persistent data & recovery
Persistent data & recovery.
Recovery needs the static and dynamic configuration plus the certificate-related state required by the deployment. These are different from the data of the applications behind the proxy. Restoring the proxy cannot restore a missing application database.
05 / How to check it
How to check it.
Validate the expected hostname, certificate, response code and application identity. A protected endpoint may correctly return an authentication challenge; a successful response from the wrong application is still a routing failure. Long-lived requests need testing beyond the first page load.
06 / Decisions & limits
Decisions & limits.
A shared entry layer simplifies naming and HTTPS, but becomes a dependency for many applications. I document application health separately from proxy health and avoid treating a single HTTP status as complete acceptance.