110 lines
5.1 KiB
Markdown
110 lines
5.1 KiB
Markdown
# Supported tags and respective `Dockerfile` links
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- [`1.2.2`, `1.2` (*1.2/Dockerfile*)](https://github.com/docker-library/golang/blob/af4e450a47a99f9a4f56225cdf598f552907d946/1.2/Dockerfile)
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- [`1.2.2-onbuild`, `1.2-onbuild` (*1.2/onbuild/Dockerfile*)](https://github.com/docker-library/golang/blob/4d4b14164e50c089a09b9364697749dc7f764824/1.2/onbuild/Dockerfile)
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- [`1.2.2-cross`, `1.2-cross` (*1.2/cross/Dockerfile*)](https://github.com/docker-library/golang/blob/4d4b14164e50c089a09b9364697749dc7f764824/1.2/cross/Dockerfile)
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- [`1.3.3`, `1.3`, `1`, `latest` (*1.3/Dockerfile*)](https://github.com/docker-library/golang/blob/af4e450a47a99f9a4f56225cdf598f552907d946/1.3/Dockerfile)
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- [`1.3.3-onbuild`, `1.3-onbuild`, `1-onbuild`, `onbuild` (*1.3/onbuild/Dockerfile*)](https://github.com/docker-library/golang/blob/4d4b14164e50c089a09b9364697749dc7f764824/1.3/onbuild/Dockerfile)
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- [`1.3.3-cross`, `1.3-cross`, `1-cross`, `cross` (*1.3/cross/Dockerfile*)](https://github.com/docker-library/golang/blob/4d4b14164e50c089a09b9364697749dc7f764824/1.3/cross/Dockerfile)
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- [`1.3.3-wheezy`, `1.3-wheezy`, `1-wheezy`, `wheezy` (*1.3/wheezy/Dockerfile*)](https://github.com/docker-library/golang/blob/af4e450a47a99f9a4f56225cdf598f552907d946/1.3/wheezy/Dockerfile)
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For more information about this image and its history, please see the [relevant
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manifest file
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(`library/golang`)](https://github.com/docker-library/official-images/blob/master/library/golang)
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in the [`docker-library/official-images` GitHub
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repo](https://github.com/docker-library/official-images).
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# What is Go?
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Go (a.k.a., Golang) is a programming language first developed at Google. It is a
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statically-typed language with syntax loosely derived from C, but with
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additional features such as garbage collection, type safety, some dynamic-typing
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capabilities, additional built-in types (e.g., variable-length arrays and
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key-value maps), and a large standard library.
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> [wikipedia.org/wiki/Go_(programming_language)](http://en.wikipedia.org/wiki/Go_(programming_language))
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# How to use this image
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## Start a Go instance in your app
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The most straightforward way to use this image is to use a Go container as both
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the build and runtime environment. In your `Dockerfile`, writing something along
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the lines of the following will compile and run your project:
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FROM golang:1.3.1-onbuild
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This image includes multiple `ONBUILD` triggers which should cover most
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applications. The build will `COPY . /usr/src/app`, `RUN go get -d -v`, and `RUN
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go install -v`.
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This image also includes the `CMD ["app"]` instruction which is the default command
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when running the image.
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You can then build and run the Docker image:
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docker build -t my-golang-app .
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docker run -it --rm --name my-running-app my-golang-app
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## Compile your app inside the Docker container
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There may be occasions where it is not appropriate to run your app inside a
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container. To compile, but not run your app inside the Docker instance, you can
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write something like:
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docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3.1 go build -v
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This will add your current directory as a volume to the container, set the
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working directory to the volume, and run the command `go build` which will tell
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go to compile the project in the working directory and output the executable to
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`myapp`. Alternatively, if you have a `Makefile`, you can run the `make` command
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inside your container.
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docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3.1 make
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## Cross-compile your app inside the Docker container
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If you need to compile your application for a platform other than `linux/amd64`
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(such as `windows/386`), this can be easily accomplished with the provided
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`cross` tags:
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docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp -e GOOS=windows -e GOARCH=386 golang:1.3.1-cross go build -v
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Alternatively, you can build for multiple platforms at once:
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docker run --rm -it -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3.1-cross bash
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$ for GOOS in darwin linux; do
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> for GOARCH in 386 amd64; do
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> go build -v -o myapp-$GOOS-$GOARCH
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> done
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> done
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# License
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View [license information](http://golang.org/LICENSE)
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for the software contained in this image.
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# User Feedback
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## Issues
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If you have any problems with or questions about this image, please contact us
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through a [GitHub issue](https://github.com/docker-library/golang/issues).
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You can also reach many of the official image maintainers via the
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`#docker-library` IRC channel on [Freenode](https://freenode.net).
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## Contributing
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You are invited to contribute new features, fixes, or updates, large or small;
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we are always thrilled to receive pull requests, and do our best to process them
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as fast as we can.
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Before you start to code, we recommend discussing your plans
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through a [GitHub issue](https://github.com/docker-library/golang/issues), especially for more ambitious
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contributions. This gives other contributors a chance to point you in the right
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direction, give you feedback on your design, and help you find out if someone
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else is working on the same thing.
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