Docker exec as root docker
Enter container as root even if default user is non-root
docker exec -it -u root <container> bash
more docker
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Copy file into running container
docker cp ./local-file.conf <container>:/etc/app/config.conf
Load image from tarball
docker load < img.tar.gz
Docker registry garbage collect
docker exec -it registry bin/registry garbage-collect /etc/docker/registry/config.yml
Multi-stage build target
docker build --target builder -t img:builder .
Build with build args
docker build --build-arg APP_VERSION=1.2.3 --build-arg ENV=prod -t myapp:1.2.3 .