doc/proposals: Managing Dockerfiles #431
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shawn-hurley
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Aug 27, 2018
shawn-hurley
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- Add options for managing dockerfiles
- Discuss the best solution and the changes needed for this solution.
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the content is wrong. |
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@xiang90 thanks for the comment. 🤦♂️ |
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@shawn-hurley This approach seems fine to me. With multiple dockerfiles users can choose and manage the base image and add other configurations for their operator image as needed. One thing I wanted to bring up for consideration was making each file a multi-stage Dockerfile. That should address #167 as well. # Build the operator binary
FROM golang:1.10.3 as builder
WORKDIR /go/src/github.com/example-inc/app-operator
COPY . /go/src/github.com/example-inc/app-operator
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /go/bin/app-operator github.com/example-inc/app-operator/cmd/app-operator/main.go
# Copy over to the base image with other customizations
FROM alpine:3.6
COPY --from=builder /go/bin/app-operator /usr/local/bin/app-operator
...
ENTRYPOINT ["app-operator"] |
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@shawn-hurley You mentioned offline that we can't do multi-stage docker files:
Can you elaborate why that's the case. /cc @spahl Still need your input on this. |
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multistage builds are a feature only in docker greater then 1.13. rhel has stuck at 1.13. I believe buildah though supports multistage now, so maybe that is a good alternative? |
estroz
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…h` instead of `docker` `buildah` is a tool that builds OCI images, from its CLI interface or by interpreting Dockerfiles. RHEL does not support docker-ce above v1.13, preventing the SDK from leveraging the multi-stage build Dockerfile feature; `buildah` supports this feature, and will continue to be supported in RHEL. See operator-framework#431 for relevant discussion.
…h` instead of `docker` `buildah` is a tool that builds OCI images, from its CLI interface or by interpreting Dockerfiles. RHEL does not support docker-ce above v1.13, preventing the SDK from leveraging the multi-stage build Dockerfile feature; `buildah` supports this feature, and will continue to be supported in RHEL. See operator-framework#431 for relevant discussion.
…h` instead of `docker` `buildah` is a tool that builds OCI images, from its CLI interface or by interpreting Dockerfiles. RHEL does not support docker-ce above v1.13, preventing the SDK from leveraging the multi-stage build Dockerfile feature; `buildah` supports this feature, and will continue to be supported in RHEL. See operator-framework#431 for relevant discussion.
…h` instead of `docker` `buildah` is a tool that builds OCI images, from its CLI interface or by interpreting Dockerfiles. RHEL does not support docker-ce above v1.13, preventing the SDK from leveraging the multi-stage build Dockerfile feature; `buildah` supports this feature, and will continue to be supported in RHEL. See operator-framework#431 for relevant discussion.
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@estroz Yeah... this feels like something we are going to have to do unless we are going to constantly have issues. If we want to layer builds like this then I don't see a way around this. Another option is to concat the files together to a temp file and then use that file for the build, If we don't wan to do the check this could be an option. |
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I think a simple image version check is enough for us. We specifically mention that the minimum version of docker is 17.03 in our README, and |
| The `operator-sdk build` command will add an option to pass in the base image example: `operator-sdk build --base-dockerfile centos-base.Dockerfile`. The `new` command will generate a default base, as it does now, called `base.Dockerfile`. If no option is passed in `base.Dockerfile` will be selected. | ||
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| #### Operator-SDK Changes | ||
| The `operator-sdk` will now add an `sdk.Dockerfile`. This dockerfile will contain all the steps to set up the operator image correctly for whichever type of operator this is. This will be changed/updated and owned by the operator-sdk, and we will not expect or respect any changes made by a user to this file. This will allow us to completely re-write it as we see fit. The testing framework will not be changed as part of this proposal. |
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Just a thought but how important is it to name the top level Dockerfile sdk.Dockerfile. Wondering if we can keep this as build/Dockerfile so it doesn't break users with older projects.
I know it's a small change to update existing projects to move build/Dockerfile to build/sdk.Dockerfile but it would be nice if we could avoid even that if the name change isn't strictly necessary.
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Overall this approach SGTM. Just a nit on how this affects existing projects. |
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We have decided to hold on implementing this until real-world problems exist and we can further understand the problem. |
