Docker Dangling Images

docker-dangling-images.sh

#!/bin/bash

#switch to docker daemon A
#build the base dummy the first pass
cat - << EOF | docker build -t ossa.docker.oraclecorp.com/dummy/helloworld:latest -
FROM busybox
RUN echo "world" > hello.txt
EOF
docker push ossa.docker.oraclecorp.com/dummy/helloworld:latest

#switch to docker daemon B
#build the child the first pass
cat - << EOF | docker build -t child:latest -
FROM ossa.docker.oraclecorp.com/dummy/helloworld:latest
CMD ["ls", "-lh"]
EOF

#Switch back to daemon A
#build the base dummy the second pass with some modifications
cat - << EOF | docker build -t ossa.docker.oraclecorp.com/dummy/helloworld:latest -
FROM busybox
RUN echo "world" > hello-again.txt
EOF
docker push ossa.docker.oraclecorp.com/dummy/helloworld:latest

#Switch back to B and build the child again
cat - << EOF | docker build --pull -t child:latest -
FROM ossa.docker.oraclecorp.com/dummy/helloworld:latest
CMD ["ls", "-lh"]
EOF