Docker is a handy way to deploy applications, and Go is handy way to build them. Here is how we build Docker containers for small apps.
Here’s how we build (nearly) single file docker containers for Go programs.
Building static go programs
As of Go 1.4, and after much futzing, here’s how I figured out to build programs statically:
frobnicator: frobnicator.go CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags '-s' -o frobnicator frobnicator.go ldd frobnicator | grep "not a dynamic executable"
Here’s a Dockerfile:
FROM scratch ADD frobnicator / CMD ["/frobnicator"]
scratch is special docker magic that means start with a blank slate.
If your application needs to make outbound SSL connections you might need to add SSL certificates
ADD ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
Image: Sean Kenney