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docker-containerization

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更新日2026年1月23日 19:25

Dockerfiles, multi-stage builds, and compose for dev/prod.

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sraloff

sraloff/gravityboots

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Docker & Containerization

When to use this skill

Creating Dockerfile or docker-compose.yml.
Optimizing image size.
Debugging container networking.

1. Dockerfile Best Practices

Multi-Stage: Use multi-stage builds to keep production images small (e.g., build in node:20, run in node:20-alpine).
Ordering: Place frequent changes (code copying) AFTER infrequent changes (npm install) to leverage layer caching.
User: Don't run as root. User USER node or create a non-root user.

2. Docker Compose

Services: Define services clearly (app, db, redis).
Volumes: Use named volumes for persistence (postgres_data:/var/lib/postgresql/data).
Env: Use .env file for environment variables.

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name	docker-containerization
description	Dockerfiles, multi-stage builds, and compose for dev/prod.

Docker & Containerization

When to use this skill

Creating Dockerfile or docker-compose.yml.
Optimizing image size.
Debugging container networking.

1. Dockerfile Best Practices

Multi-Stage: Use multi-stage builds to keep production images small (e.g., build in node:20, run in node:20-alpine).
Ordering: Place frequent changes (code copying) AFTER infrequent changes (npm install) to leverage layer caching.
User: Don't run as root. User USER node or create a non-root user.

2. Docker Compose

Services: Define services clearly (app, db, redis).
Volumes: Use named volumes for persistence (postgres_data:/var/lib/postgresql/data).
Env: Use .env file for environment variables.