Containers from first principles: what they are, the runtimes underneath them, Docker and Podman as tools, and the security/supply-chain discipline production demands.https://containers.bradpenney.io/ Brad Penneyen Thu, 16 Jul 2026 00:17:11 -0000 Thu, 16 Jul 2026 00:17:11 -0000 1440 MkDocs RSS plugin - v1.19.0 https://containers.bradpenney.io/images/exploring_containers.png https://containers.bradpenney.io/ Install Docker or Podman on Linux, macOS, or Windows from the command line — no Docker Desktop. Verify it works before writing a single Dockerfile. https://containers.bradpenney.io/day_one/getting_docker_running/ Wed, 15 Jul 2026 09:00:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/getting_docker_running/ Running a monolith and a handful of extracted services together is the normal, long-term state of most real migrations — not a failure to eventually fix. https://containers.bradpenney.io/day_one/monolith/living_with_partial_migration/ Tue, 14 Jul 2026 11:15:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/monolith/living_with_partial_migration/ Pull one validated seam out of the monolith and run it as its own container, side by side with the monolith, without betting the whole migration on it yet. https://containers.bradpenney.io/day_one/monolith/first_slice/ Tue, 14 Jul 2026 11:00:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/monolith/first_slice/ Four signals that tell you a piece of a monolith is a real service boundary, not just a convenient folder — and the distributed-monolith trap that comes from ignoring them. https://containers.bradpenney.io/day_one/monolith/finding_the_seams/ Tue, 14 Jul 2026 10:45:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/monolith/finding_the_seams/ Understand why 'get off the VMs' is really two separate problems, and why containerizing the monolith as-is is a legitimate first step, not a shortcut. https://containers.bradpenney.io/day_one/monolith/why_it_has_to_move/ Tue, 14 Jul 2026 10:30:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/monolith/why_it_has_to_move/ A container that only runs on your laptop hasn't solved the problem yet. Tag, push, and pull an image through a container registry. https://containers.bradpenney.io/day_one/app/sharing_with_your_team/ Tue, 14 Jul 2026 10:15:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/app/sharing_with_your_team/ Diagnose a container that exits immediately or runs but doesn't respond — docker logs, docker inspect, docker exec, and the 0.0.0.0 gotcha. https://containers.bradpenney.io/day_one/app/debugging/ Tue, 14 Jul 2026 10:00:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/app/debugging/ docker build and docker run, the gap between a successful build and a working container, and how to pass secrets in without baking them into the image. https://containers.bradpenney.io/day_one/app/build_and_run/ Tue, 14 Jul 2026 09:45:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/app/build_and_run/ Write a working Dockerfile for the app you already built — line by line, with the defaults that keep it small, cacheable, and not running as root. https://containers.bradpenney.io/day_one/app/first_dockerfile/ Tue, 14 Jul 2026 09:30:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/app/first_dockerfile/ The real mental model for containers: a normal process the kernel agrees to isolate, not a smaller virtual machine. Covers the image vs. container distinction. https://containers.bradpenney.io/day_one/what_is_a_container/ Tue, 14 Jul 2026 09:15:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/what_is_a_container/ Two paths into containerization for developers: containerizing a single app for the first time, or breaking a monolith out of VMs. Start here. https://containers.bradpenney.io/day_one/overview/ Tue, 14 Jul 2026 09:00:00 -0300 Exploring Containershttps://containers.bradpenney.io/day_one/overview/ A progressive guide to containerization — from what a container actually is, to the runtimes underneath it, to running it securely in production. https://containers.bradpenney.io/ Sun, 12 Jul 2026 12:00:00 -0300 Exploring Containershttps://containers.bradpenney.io/