docker buildx offline?

[Will-NN]

Hi all. First time using buildx here, I'm trying to build an arm64 image, and looking for some help.

I'm using docker 19.03 so I enabled the experimental mode to use buildx, and verified that I can do "docker buidx ...", etc.... Then I created a new builder "docker buildx create --name mybuilder" and set to use it "docker buildx use mybuilder". However, when I tried "docker build inspect --bootstrap", I got an error something like "ERROR [internal] booting buildkit". I realized that this error was due to the fact that I don't have an internet connection on my build machine. Once I connected my build machine to the internet, this command went through. Then, what is the process of building with buildx on an offline machine? (since I'll need to repeat the process on an offline machine later.)

[thaJeztah]

I guess creating the build will pull an image to run the builder in.

You should be able to run buildx against the version of buildkit embedded in the docker 19.03 daemon (but some features may not be available as it's an older version of buildkit)

Not sure if there's a way to create the container builders from an offline image

[thaJeztah]

docker buildx build by default connects to /var/run/docker.sock (or the host that you're using for your docker commands); in that case it automatically uses the buildkit instance that's provided by the docker daemon

[Will-NN]

I guess I still don't understand it. No matter what I do, "docker buildx build" still trying to pull an image from the docker registry (which would fail once I disconnect my host from the internet)

[+] Building 0.1s (1/1) FINISHED
=> ERROR [internal] booting buildkit 0.1s
=> => pulling image moby/buildkit:buildx-stable-1 0.1s

[internal] booting buildkit:

---

error: Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io

[morlay]

You could set image of your private container registry.

[ericwongwh]

@morlay, how to configure buildx to pull buildkit image from private container registry?

[bropuffshroom]

@morlay, how to configure buildx to pull buildkit image from private container registry?

docker buildx create --name builder1 --driver=docker-container --driver-opt image=YOUR_PRIVATE_REGISTRY.io/buildkit:buildx-stable-1

you can refer to the documentation here https://docs.docker.com/build/drivers/docker-container/#usage