![]() ![]() export DOCKER_BUILDKIT=1īuild secrets implementation is based on two new features provided by BuildKit. The intention is to make BuildKit backend default in a future release. BuildKit is an opt-in feature in 18.09 that can be enabled with an environment variable DOCKER_BUILDKIT=1before running docker build. The first thing to do to use build secrets is to enable BuildKit backend. ![]() BuildKit backend comes with a bunch of new features, one of them being build secrets support in Dockerfiles. Most importantly it can now use a completely new backend implementation that is provided by the Moby BuildKit project. The build command Docker 18.09 comes with a lot of new updates. Some creative use cases leveraged multi-stage builds, but the user still needed to be very careful to make sure the final stage is clean from all secure values, and the secret files would be kept in the local build cache until it is pruned. You shouldn’t use environment variables or plainly remove the secret files after use because they would still remain in the metadata of the image. If you need to access some private repository or service there really wasn’t a very good solution to achieve that. One of the complexities when using Dockerfiles has always been accessing private resources. ![]()
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