dockerfile tag test

dockerfile.sh

#!/bin/bash

echo 'FROM alpine:3.12\nENTRYPOINT ["echo", "this is version 1"]' > Dockerfile
docker build -t $DOCKER_USER/tag_test .
docker run $DOCKER_USER/tag_test # 'this is version 1'
docker tag $DOCKER_USER/tag_test $DOCKER_USER/tag_test:1
docker push $DOCKER_USER/tag_test

echo 'FROM alpine:3.12\nENTRYPOINT ["echo", "this is version 2"]' > Dockerfile
docker build -t $DOCKER_USER/tag_test:2 .
docker push $DOCKER_USER/tag_test
docker pull $DOCKER_USER/tag_test:latest
docker run $DOCKER_USER/tag_test:latest # still says 'this is version 1'

# if you want "latest" to get updated, you need to run the following
docker build -t $DOCKER_USER/tag_test .
docker run $DOCKER_USER/tag_test # 'this is version 2'