Page 14 - Docker

Docker

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Structuring Docker Compose Cleanly: Services, Profiles, Overrides, and .env Files

Maxim Mironjuk - July 15, 2025

Anyone who crams every environment into a single docker-compose.yml will soon be fighting configuration drift, hardcoded passwords, and deployments that behave differently locally than in CI. Profiles, overrides, and cleanly separated .env files solve exactly these problems, without the Compose project growing into something unreadable.

Docker

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Init Container Pattern: Database Migrations Before App Startup in Docker Compose

Maxim Mironjuk - July 14, 2025

Hiding migration logic in the app container's entrypoint works fine for a while and then breaks down uncomfortably under scaling, parallel startups, or failed migrations. A dedicated, short-lived init container with a clear success condition fixes this structurally.

Docker PHPStorm PHPUnit

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PHPUnit in PhpStorm: Run Configurations, Coverage and Test Filters

Maxim Mironjuk - July 13, 2025

Anyone who only runs PHPUnit from the command line is giving up most of PhpStorm's productivity. Run Configurations, coverage reports right in the editor, test filters down to a single method, and the Docker remote interpreter turn PhpStorm into a complete testing environment, without ever leaving the terminal behind for good reason.

Docker

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Detecting and Systematically Debugging Container Restart Loops

Maxim Mironjuk - July 13, 2025

A container that starts, runs briefly, and then crashes again in an endless loop is one of the most frustrating everyday problems in Docker operations, since the logs often disappear faster than you can read them. A systematic approach narrows down the cause within minutes in most cases, instead of guessing wildly at configuration values.

Docker

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Macvlan Networks: Use Cases and Limitations

Maxim Mironjuk - July 11, 2025

A macvlan network gives containers their own IP address visible on the physical network, with no port mapping through the Docker host at all. This solves real problems for legacy applications and monitoring systems, but comes with a known limitation around communication between host and container that must be understood before going to production.

Docker

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Choosing the Right Docker Log Driver: json-file vs. journald

Maxim Mironjuk - July 11, 2025

Docker's default setting is rarely the right choice for production environments. The log driver json-file only rotates logs after explicit configuration and exists as a plain text file, while journald integrates logs directly into the systemd journal infrastructure, with structured metadata and central querying via journalctl.

Docker Testing/E2E

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Linting and Testing Dockerfiles and Compose Files: hadolint, trivy, docker compose validate

Maxim Mironjuk - July 09, 2025

Dockerfiles that are never statically checked accumulate silent problems: outdated base images with critical CVEs, invalid compose configurations, and structural issues that only surface once they hit production. Automated linting and testing closes that gap right inside the CI pipeline.

Docker Security/OWASP

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Docker Socket Mounting: Why It Grants Root Access and What Is Safer

Maxim Mironjuk - July 09, 2025

The Docker socket is often mounted as a convenient trick so a container can start other containers itself. What gets overlooked most: reaching that socket effectively grants root privileges on the entire host, no --privileged flag required.

Symfony Docker

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Symfony Docker Images: Production Ready Multi Stage Builds

Maxim Mironjuk - July 08, 2025

A Symfony Docker image that runs locally is far from production ready. Multi stage builds separate the build environment from the runtime, Composer caching shortens every build, and a non root user plus a healthcheck make the container operable. This article walks through building a lean, hardened Symfony Docker image step by step.

Docker Design Patterns

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Docker Swarm vs Kubernetes: When Each Orchestration Fits

Maxim Mironjuk - July 08, 2025

Docker Swarm and Kubernetes solve the same core problem, running containers reliably across multiple hosts, but with completely different operational effort. Teams that base the decision purely on how popular Kubernetes is often build in unnecessary complexity that nobody actually needs day to day.