Build and run a Go project in the smallest containers. This is the example of
a tiny web server using the net/http package from the standard library.
Go produces tiny and independent binaries that can be run on bare metal, we can use that to use the smallest container image in production called scratch. For this to, a two-step build process is necessary.
Inspiration comes mostly from this article of the Codeship blog and this other one from the iron.io blog. GoDocker took elements from both but with several points in mind:
- No local go installation required (full process happening in containers)
- More operations described in Dockerfiles rather than in docker run huge one-liners
You need Docker installed on your machine and... that's it. Build the project:
chmod +x build.sh
./build.sh
The build script builds the image application-builder and compiles
the go project inside the container. At this point, a application file appeared
in the project directory.
Launch the server inside a container
docker build --rm -f Dockerfile.scratch . --tag app-runner
docker run --rm --name="tinydocker" app-runner
Find the container's local address at the "IPAddress" key when running inspect:
docker inspect tinydocker
(Hint, it is usually 172.17.0.2 if no other container is running).
Go to the address http://:8080 to test the result.