Docker image for Go service from the Scratch

Today I changed the script to dockerize go projects godockerize, to support the ‘scratch’ image.

The way I do it, is cross compile for Linux, and after that add the binary to the image, that’s all. Ready to build and run.

To enable cross compile on Mac to build Linux executable

Follow this steps

$ cd /usr/local/go/src

$ sudo GOOS=linux CGO_ENABLED=0 ./make.bash --no-clean

You can try it doing, for example:

$ GOOS=linux CGO_ENABLED=0 go build -o gopherscraper

# Checking that is linux binary
$ file gopherscraper
gopherscraper: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped

Use the new flag ‘scratch’

Once you activate cross compilation you can use the new flag to generate and build the Docker image from the ‘scratch’

For example:

$ cd $GOPATH/src/

# Run godockerize using -scratch
$ godockerize -expose 3001 -scratch

Dockerfile generated, you can build the image with:
$ docker build -t gopherscraper .

# Run my microservice
$ docker run --rm  -p 3001:3001 -e ES= gopherscraper

You can get a really light image, using this method :)

REPOSITORY                    TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
gopherscraper                 latest              8dad2e0ca7f9        55 minutes ago      10.61 MB
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December 9, 2014
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golang docker


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