Testing
How to Run Tests in Docker for a Clean Environment
Run tests in Docker for a clean, repeatable environment: a one-line run, a test stage, Compose with services, dependency caching and file ownership.
6 min read
Tag
docker
38 posts
Security
How to Harden Docker Containers From the Command Line
Harden Docker containers from the command line: non-root user, read-only filesystem, dropped capabilities, no new privileges and resource limits.
6 min read
Docker
How to Use Compose Watch for Live Reload Without Surprises
Use Docker Compose watch for live reload: configure sync, rebuild and sync restart actions, ignore noisy paths and know when a bind mount is still better.
6 min read
Docker
How to Use Compose Profiles Overrides and Extends Fast
Manage Compose variants with profiles, override files, multiple -f files and include: what merges, what replaces, and how to see the final result.
6 min read
Docker
How to Use Compose Healthchecks and depends on the Safe Way
Make Compose wait for a ready database: write a healthcheck, use depends_on with condition service_healthy, tune the timings and use up --wait in scripts.
6 min read
Docker
How to Use Docker Compose for Local Development Step by Step
A Docker Compose tutorial for local development: write a compose file for an app and a database, start it, read logs, run commands inside and tear it down.
6 min read
Docker
How to Expose and Publish Ports in Docker the Safe Way
Publish Docker ports safely: the difference between EXPOSE and -p, binding to localhost, the firewall bypass, random ports and how to check what is listening.
6 min read
Docker
How to Use Docker Networks and Container DNS the Safe Way
Understand Docker networks and container DNS: why the default bridge has none, how user defined networks resolve names, aliases, and reaching the host.
6 min read
Tooling
How to Use fzf With git Docker and Man Pages in Real Scripts
Build interactive pickers with fzf for git branches and commits, Docker containers and man pages: previews, multi select, key bindings and safe quoting.
6 min read
Debugging
How to Debug Docker Containers That Misbehave Step by Step
Debug a misbehaving Docker container: read logs and exit codes, check OOM kills, open a shell, debug images without a shell and compare configuration.
6 min read
CI/CD
How to Build and Push Docker Images in CI Step by Step
Build and push a Docker image from CI with GitHub Actions: log in, tag from git, use the build cache, push only on trusted events and keep credentials safe.
6 min read
Docker
How to Fix File Permissions on Docker Bind Mounts Safely
Fix permission denied on Docker bind mounts by matching user IDs, using the user option, fixing ownership, and handling SELinux labels and rootless mode.
6 min read