How deeply does Kubernetes for Developers cover port forwarding?

Explains host-to-service and host-to-container mappings with commands, access patterns, and a network-interface flag.

Port forwarding

As explained in Kubernetes for Developers

Port forwarding maps a network port on one endpoint to a port on another endpoint so traffic can reach a service.

Port forwarding connects a convenient local port to a service running elsewhere. It lets you test a container or Kubernetes Service through localhost without assigning the service a public endpoint. section 3.4.3 section 2.2.1

Use port forwarding when you need to:

Browse or query a containerized HTTP server locally, such as mapping host port 8080 to container port 80. section 2.2.1
Reach a Kubernetes Service locally when a LoadBalancer Service has no external IP in a local cluster. section 3.4.3
Debug a cloud Kubernetes Service or let a Docker container reach it through host.docker.internal. section 3.4.3

kubectl port-forward service/$SERVICE_NAME $FROM_PORT:$TO_PORT

Run kubectl port-forward with a Service name and a local-to-Service port pair: kubectl port-forward service/$SERVICE_NAME $FROM_PORT:$TO_PORT. section 3.4.3

Expose a Kubernetes time service

Forward the Service with kubectl port-forward service/timeserver 8080:80, then open http://localhost:8080. For a Docker container using Redis, forward 6379:6379 and connect to host.docker.internal on port 6379. section 3.4.3

How Kubernetes for Developers covers it

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Also explained in

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Bootstrapping Microservices, Second Edition: With Docker, Kubernetes, GitHub Actions, and TerraformPort forwarding is the redirection of network traffic arriving at one port to a designated port on another network endpoint.
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Road to KubernetesPort forwarding is a networking technique that maps a local port to a port on a remote resource.
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ScyllaDB in ActionPort forwarding maps a port on one network endpoint to a port on another endpoint so that connections can reach a service.
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Google Anthos in ActionPort forwarding is a networking technique that maps a port on one system to a port on another service or system.

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Related concepts

kubectlused by · kubectl is the Kubernetes command-line client for communicating with the Kubernetes API and managing cluster resources.
Dockerused by · Docker is a platform and ecosystem for building, distributing, and running applications in containers.
servicecontrasts with · A Kubernetes Service is an API resource that provides stable network access and service discovery for a changing set of Pods or other specified destinations.
docker runconfigured by · docker run is a Docker command that creates and starts a container from an image, with optional runtime configuration.
Skaffoldconfigured by · Skaffold is a command-line tool that automates development workflows for building, deploying, and iterating on containerized applications.
database drivercontrasts with · A database driver is client software that implements the interface or protocol an application uses to connect to and communicate with a database system.

This explainer was generated by Manning's knowledge graph from the text of Kubernetes for Developers. The section links point to the parts of the book it draws on.