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I'd like to use one experimental feature of Docker BuidlKit (mount=type=cache)

The first lines of my Dockerfile are:

 # syntax=docker/dockerfile:experimental FROM i386/debian:buster # # Setup an apt cache for Docker (experimental) # RUN rm -f /etc/apt/apt.conf.d/docker-clean; echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache RUN --mount=type=cache,target=/var/cache/apt --mount=type=cache,target=/var/lib/apt apt update && apt-get --no-install-recommends install -y gcc

I have setup a Password Store for docker, logged in successfully to docker hub, "docker-credential-pass" binary in my PATH, setup the "docker login process using the encrypted password". (as described in

"How to Enable Docker Experimental Features and Encrypt Your Login Credentials"

 kalou@shinwey $ pass list Password Store `-- docker-credential-helpers |-- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx | `-- berryamin `-- docker-pass-initialized-check

But when I launch the image build, the process fails:

 DOCKER_BUILDKIT=1 docker build -t minexpert2:0.1 . [+] Building 0.5s (3/3) FINISHED => [internal] load build definition from Dockerfile 0.1s => => transferring dockerfile: 38B 0.0s => [internal] load .dockerignore 0.1s => => transferring context: 2B 0.0s => ERROR resolve image config for docker.io/docker/dockerfile:experimental 0.4s ------ > resolve image config for docker.io/docker/dockerfile:experimental: ------ failed to solve with frontend dockerfile.v0: failed to solve with frontend gateway.v0: rpc error: code = Unknown desc = error getting credentials - err: exit status 1, out: `exit status 2: gpg: decryption failed: No secret key`

May someone help to explain what's missing here?

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  • Maybe similar to stackoverflow.com/questions/28321712/… Commented Apr 19, 2020 at 8:08
  • More investigation gives in log: Apr 19 19:52:00 shinwey dockerd[4960]: time="2020-04-19T19:52:00.208583620+02:00" level=warning msg="grpc: addrConn.createTransport failed to connect to { 0 <nil>}. Err :connection error: desc = \"transport: Error while dialing only one connection allowed\". Reconnecting..." module=grpc Commented Apr 19, 2020 at 17:52
  • 1
    might be related to "buildkit: Build fails when FROM image isn't cached" github.com/moby/buildkit/issues/1271 Commented Apr 27, 2020 at 13:15

1 Answer 1

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try download first the docker image and run command for build image, it worked me

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