Minimal Docker containers for Go applications

This repo features a simple demo app that fetches https://google.com and outputs the status code and the size of the html in the response body.

Usage

Clone this repo.

To be able to make requests via https, copy the ssl certificates from your host machine and paste them in the current directory.

For many Linux distributions, this file is in /etc/ssl/certs/ca-certificates.crt. In my case, I've got mac OSX with openssl installed via homebrew, so this file was in /usr/local/etc/openssl/cert.pem).

Build the main.go file by running:

CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main .

We’re disabling cgo which gives us a static binary. We’re also setting the OS to Linux (in case someone builds this on a Mac or Windows) and the -a flag means to rebuild all the packages we’re using, which means all the imports will be rebuilt with cgo disabled.

Build the image

$ docker build -t golang-lightweight-image .

Run the following command to see the output in your terminal

$ docker run -it --rm golang-lightweight-image

Note: the --rm will delete the container when the app exits.

That's it! :)