67 lines
2.6 KiB
Markdown
67 lines
2.6 KiB
Markdown
# 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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%%LOGO%%
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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-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 without arguments.
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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 "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3 go build -v
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This will add your current directory as a volume to the container, set the
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working directory to the volume, and run the command `go build` which will tell
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go to compile the project in the working directory and output the executable to
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`myapp`. Alternatively, if you have a `Makefile`, you can run the `make` command
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inside your container.
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docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3 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 "$PWD":/usr/src/myapp -w /usr/src/myapp -e GOOS=windows -e GOARCH=386 golang:1.3-cross go build -v
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Alternatively, you can build for multiple platforms at once:
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docker run --rm -it -v "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3-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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