How deeply does Road to Kubernetes cover port forwarding?

Explains Pod, StatefulSet, and Service commands with port mappings, but stops short of in-cluster communication.

Port forwarding

Port forwarding is a networking technique that maps a local port to a port on a remote resource.

Port forwarding maps a local port to a port on a remote Kubernetes resource, letting localhost connect to a cluster resource without exposing the database publicly. section 8.4.2

Use kubectl to forward traffic to different Kubernetes targets:

Pod: kubectl port-forward postgres-0 3312:5432 section 8.4.2
StatefulSet: kubectl port-forward statefulsets/postgres 3312:5432; this selects the first Pod. section 8.4.2
Service: kubectl port-forward service/postgres 3312:5432. section 8.4.2

Connecting to PostgreSQL locally

After forwarding local port 3312 to PostgreSQL port 5432, connect with psql -h localhost -U postgres -d postgres-db -p 3312. Port forwarding verifies access from the local machine, not container-to-container communication inside the cluster. section 8.4.2

How Road to Kubernetes covers it

liveBook manning.com

Read Road to Kubernetes on liveBook Get the book at manning.com

Also explained in

liveBook manning.com

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.
liveBook manning.com

Kubernetes for DevelopersPort forwarding maps a network port on one endpoint to a port on another endpoint so traffic can reach a service.
liveBook manning.com

ScyllaDB in ActionPort forwarding maps a port on one network endpoint to a port on another endpoint so that connections can reach a service.
liveBook manning.com

Google Anthos in ActionPort forwarding is a networking technique that maps a port on one system to a port on another service or system.

Compare how 5 books explain port forwarding →

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 Road to Kubernetes. The section links point to the parts of the book it draws on.