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/github.com/dahernan/gopherscraper
# 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=192.168.1.101 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
