If you have a directory that contains files named Dockerfile*, for example in a Git repo, you can use the following script provided.
The script will recurse the target directory, looking for Dockerfile* and probe them for FROM xxx statements and list all container images hosted on Docker Hub.
This assumes any referenced images have an associated tag.
For example, amazonlinux:2 or amazonlinux:latest will be discovered. amazonlinux will be missed.
The script will print out Dockerfile location and image on each line.
If a Dockerfile has multiple FROM images each one will be printed.
Run the script to recursively detect Dockerfiles in your current directory.
./detect-images.sh
./Dockerfile golang:1.15.0
./Dockerfile golangci/golangci-lint:v1.27-alpine
./Dockerfile amazonlinux:2
Optionally you can provide a directory you would like the script to search
./detect-images.sh ~/src/aws-load-balancer-controller
/home/user/src/aws-load-balancer-controller/Dockerfile golang:1.15.0
/home/user/src/aws-load-balancer-controller/Dockerfile golangci/golangci-lint:v1.27-alpine
/home/user/src/aws-load-balancer-controller/Dockerfile amazonlinux:2