Build with build args

Pass build-time variables to Dockerfile ARG instructions

docker build --build-arg APP_VERSION=1.2.3 --build-arg ENV=prod -t myapp:1.2.3 .
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docker46 commands
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docker

More docker commands

  • Multi-platform build
    docker buildx build --platform linux/amd64,linux/arm64 -t myapp:latest --push .

    Build and push multi-arch image using BuildKit

  • Inspect image layers
    docker history --no-trunc <image>

    Show all layers with full commands and sizes

  • Export container filesystem
    docker export <container> | tar -tvf - | head -30

    Inspect a container's merged filesystem as a tar stream

  • Diff container from image
    docker diff <container>

    Files added (A), changed (C), or deleted (D) in a running container

  • Commit container to image
    docker commit -m 'debug snapshot' <container> debug-snapshot:$(date +%s)

    Snapshot a running container's filesystem as an image

all 46 docker commands