[Container-tools] Trick to do a docker "multi-stage-build" using minishift ?

[Xavier Coulon]

Hello Charles,

I've tried it before and failed too, because minishift/Openshift uses an
older version of Docker that does not support multi-stage builds:

````
$ eval $(minishift docker-env)
$ docker version
Client:
 Version:      18.03.1-ce
 API version:  1.24 (downgraded from 1.37)
 Go version:   go1.9.5
 Git commit:   9ee9f40
 Built:        Thu Apr 26 07:13:02 2018
 OS/Arch:      darwin/amd64
 Experimental: false
 Orchestrator: swarm

Server:
 Engine:
  Version:      *1.12.6*
  API version:  1.24 (minimum version )
  Go version:   go1.6.4
  Git commit:   78d1802
  Built:        Wed Jan 11 00:23:16 2017
  OS/Arch:      linux/amd64
  Experimental: false
````

I have not tried it yet, but maybe https://github.com/projectatomic/buildah
could help since it supports multi-stage builds since V1.0 (
https://github.com/projectatomic/buildah/releases/tag/V1.0 /
https://github.com/projectatomic/buildah/pull/495). So you may be able to
build and push with Buildah without having to use the Docker daemon running
on OpenShift (again, this is just assumptions, it needs to be verified)

Also, I found this PR (https://github.com/openshift/imagebuilder/pull/59),
so you may want to give a try to https://github.com/openshift/imagebuilder
- although it's still apparently in beta for now.

HTH.




On Thu, Jun 21, 2018 at 11:31 AM, Charles Moulliard <cmoullia at redhat.com>
wrote:

> Hi
>
> Is there a trick to be able to do a multi stages build using docker 17.x
> running in minishift [1] ?
>
> E.g. Dockerfile to be processed
>
> FROM golang:1.9.4 as builder
> ..
> # Build and test the API code
> RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o
> controller-manager ./cmd/controller-manager/main.go
> RUN go test ./pkg/... ./cmd/...
>
> # Copy the controller-manager into a thin image
> FROM ubuntu:latest
> WORKDIR /root/
> COPY --from=builder /go/src/github.com/cmoulliard/
> my-controller/controller-manager .
>
> Docker reports this error :
>
> docker build . -f Dockerfile.controller -t gcr.io/kubeships/controller-
> manager:v1
> Sending build context to Docker daemon    246MB
> Step 1/23 : FROM golang:1.9.4 as builder
> Error parsing reference: "golang:1.9.4 as builder" is not a valid
> repository/tag: invalid reference format
>
> [1] https://docs.docker.com/develop/develop-images/multistage-build/
>
> Regards
>
> Charles
>
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>
>


-- 
Best regards,
/Xavier
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