docker-是否可以查看所有先前的Dockerfile？

Question

For example:

• python:3.6-stretch pulls from buildpack-deps:stretch
• which in turn pulls from buildpack-deps:stretch-scm
• which in turn...

Thus I am wondering: is there a way to download/view all preceding Dockerfiles to understand what is coming from where and how?

Many thanks!

Answer 1

docker history <IMAGE> will show you the history of an image. Some histories are better than others but you can get a sense of what is being done at each layer on the way. Size 0B usually means metadata added to the image while anything greater than 0B means ADD , COPY , RUN , or other file system related change.

if there an IMAGE ID then you can also do docker inspect <image id> which will tell you the details about the image . If you just want to know the tag you can do

docker inspect --format='{{range .RepoTags}}{{.}}{{end}}' <image id>

A little example of formatting a history:

docker history --format "{{.ID}}" <IMAGE> | grep -v "<missing>" | xargs docker inspect --format='{{range .RepoTags}}{{.}}{{end}} {{range .ContainerConfig.Cmd}}{{.}}{{end}}'