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Last active March 21, 2024 09:33
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Create a static binary in go and put it in a from scratch docker container
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Dockerfile
FROM golang:1.9
WORKDIR /go/src/github.com/purplebooth/example
COPY . .
RUN go build -ldflags "-linkmode external -extldflags -static" -a main.go
FROM scratch
COPY --from=0 /go/src/github.com/purplebooth/example/main /main
CMD ["/main"]
@emmiep
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emmiep commented May 15, 2018

I think I understand -ldflags, it seems like it's used to make use of gnu ld which can use the -static flag to build a static library, but I don't understand why -a is needed (other examples use it as well).

According to the docs it "force(s) rebuilding of packages that are already up-to-date.".
Is it because some built packages aren't built in a way that works when linking statically?

@ChristianKniep
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Just stole this nice little dockerfile for a pet-project. Thanks for putting it out.
Btw: you do not need the first RUN to create the directory. WORKDIR will do that for you if it does not exist. :)

@whatever
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💯 this is really useful to know (especially when first messing with docker)

@liampulles
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Really useful!

@MajorWalrus
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This is exactly what I needed. Thank you!

@PurpleBooth
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PurpleBooth commented Aug 7, 2019 •
edited
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@ChristianKniep wrote:

Just stole this nice little dockerfile for a pet-project. Thanks for putting it out.
Btw: you do not need the first RUN to create the directory. WORKDIR will do that for you if it does not exist. :)

Ooh! Didn't know that! Updated 👍

@liao02x
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liao02x commented Nov 16, 2019

Got this error when trying to run the container. Any idea? docker: Error response from daemon: OCI runtime create failed: container_linux.go:345: starting container process caused "exec: \"./main\": permission denied": unknown.

@PurpleBooth
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PurpleBooth commented Nov 16, 2019 •
edited
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Does main exist? The example copies to /main from the build container rather than ./main

Here's another similar example

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