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Learn how to build smaller, more secure Docker container images using Multi-Stage Builds. This guide explains common sources of image bloat, best practices for slimming down production images, and practical examples for Node.js, Go, Rust, and other application stacks. Start optimizing your containers today!
Pomerium can be used as a native SSH reverse proxy, adding OAuth authentication and flexible Pomerium policy enforcement to standard SSH connections, without the need for tunnels, or custom clients or servers.
Use Pomerium's native SSH support to publish a local service through a standard reverse SSH tunnel, with OpenID Connect (OIDC) authentication and continuous authorization on every request. Reach services behind Network Address Translation (NAT) without firewall holes or custom agents, and control both who can use the service and who can open the tunnel. Application traffic stays on infrastructure you control.
Combine multi-stage builds, build-time arguments, non-root users, and Pod security context into a single production-grade image pipeline.
A poorly structured Docker image contains leftover build dependencies and leaked private registry credentials hiding in its intermediate layers. Squash the image to produce a clean, compact version with the same runtime filesystem.
Practice using Docker build arguments to inject version and commit metadata into a Go application during the image build.
Build a container image for a Node.js app that uses a private npm package without leaking the registry credentials into the image layers.
Learn how to write Dockerfiles from scratch and build production-ready container images. Start with the basics of image building and progress through handling dependencies, compiling applications, inspecting image internals, and optimizing builds with multi-stage Dockerfiles. Then go deeper with advanced Dockerfile instructions, analyzing image internals, and producing multi-platform builds.
Fast, repeatable Docker exercises for Dockerfile instructions, multi-stage builds, and build options.
