proposal: Add option to pull base images

[larroy]

Problem description

When using a base image and --cache-from to avoid rebuilding containers in CI environments for example, if the base image used in the dockerfile is stale, it triggers a rebuild of the container. This is not the case when the base images are pulled.

Ideally there would be a way to pull a container and it's base images so they are all updated.

For example, see the use of --cache-from in our CI for MXNet here:

http://jenkins.mxnet-ci.amazon-ml.com/blue/rest/organizations/jenkins/pipelines/mxnet-validation/pipelines/unix-cpu/branches/master/runs/707/nodes/49/steps/176/log/?start=0

Problem location

• I saw a problem on the following URL:

• I couldn't find the information I wanted. I expected to find it near the following URL:

• Other:

Project version(s) affected

Suggestions for a fix

See above.

[traci-morrison]

Thank you for your feedback. This seems to be a feature request or a fundamental change in the way Docker works, but this GitHub repository is only for Docker documentation. Please file an issue in https://github.com/docker/ instead.

[docker-robott]

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