dockerignore in Docker
From the Docker cheat sheet · Dockerfile · verified Jul 2026
.dockerignore
Exclude files from the build context to speed up builds and avoid leaking secrets
bash
# .dockerignore
node_modules
.git
.env
*.md
dist
.DS_Store💡 Without .dockerignore, Docker sends EVERYTHING in the directory to the build daemon
⚡ Always ignore node_modules — they get reinstalled with npm ci inside the image
📌 Ignore .env files to prevent secrets from being baked into the image
🟢 Same syntax as .gitignore — supports wildcards, negation (!important.md), and comments
dockerignorebuildsecurity
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