ECR / Pull-through-cache rule: how should I adapt my CI?

Question

My (Gitlab)CI is building containers using Dockerfiles. To use Pull-Through-Cache rules with ECR, how should I modify it?

1. Adapt the Dockerfile's FROM: statement?
For instance from FROM:php:fpm to FROM:.dkr.ecr..amazonaws.com/library/php:fpm ?

But that's cumbersome (people who don't have ECR access can't build the Dockerfile)

2. Or is there any other way (in Docker config?)

Accepted Answer

Unfortunately our implementation does not leverage the Docker config "registry-mirrors" feature. This means you currently can only use our ecr pull-through cache by updating the base image reference("FROM:...").

How often do you change your Dockerfile? Is it maybe a feasible approach to use a tool like "sed" in the CI/CD to overwrite the "FROM" Reference in the Docker File to the ecr pull-through cache address, so that GitLab CI uses the cache, but other Developers who build locally don't?

ECR / Pull-through-cache rule: how should I adapt my CI?

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