Static Go Binaries w/ Docker - Entrypoint Not Found - go

Question

I used Static Go Binaries with Docker on OSX by Nicola Paolucci to try to use static Go binary w/ Docker. I believe I followed every step correctly, but when I run the final image, I get the following error response from Docker.
NOTE The name of my service and executable are netverify
docker: Error response from daemon: Container command '/netverify' not found or does not exist..
My Dockerfile.static looks like the following...
#Create a minimal container to run a Golang static binary
FROM tianon/true
ADD netverify /
EXPOSE 8282
CMD ["/netverify"]
My Dockerfile.build looks like the following...
FROM golang
ADD Makefile /
WORKDIR /
RUN make setup
ADD . /go/src/github.com/eirwin/netverify
RUN make buildgo
CMD ["/bin/bash"]
My Makefile is the following...
GOCMD = go
GOBUILD = $(GOCMD) build
GOGET = $(GOCMD) get -v
GOCLEAN = $(GOCMD) clean
GOINSTALL = $(GOCMD) install
GOTEST = $(GOCMD) test
.PHONY: all
all: build
setup:
$(GOGET) github.com/gorilla/mux
buildgo:
GOOS=linux $(GOBUILD) -o netverify ./go/src/github.com/eirwin/netverify
builddocker:
docker build -t eirwin/netverify -f ./Dockerfile.build .
docker run -t eirwin/netverify /bin/true
docker cp `docker ps -q -n=1`:/netverify .
chmod 755 ./netverify
docker build --rm=true --tag=eirwin/netverify -f Dockerfile.static .
run: builddocker
docker run -p 8282:8282 eirwin/netverify
For the purpose of this post, lets assume I have the following as my golang application.
func main() {
router := mux.NewRouter()
router.HandleFunc("/ping", api.PingHandler).Methods("GET")
http.ListenAndServe(":8282", router)
}
When I run Make run everything seems to work except for when the image is ran.
I can see that the image builds correctly at ~8.5MB
eirwin/netverify latest eae16e146b91 3 seconds ago 8.63 MB
But when If docker run -p 8282:8282 eirwin/netverify is ran I get the following error...
docker: Error response from daemon: Container command '/netverify' not found or does not exist..

Answer 1

The go static build in your makefile is missing some options.
buildgo:
CGO_ENABLED=0 GOOS=linux go build -ldflags "-s" -a -installsuffix cgo -o netverify ./go/src/github.com/eirwin/netverify
The build process can capture the container ID to avoid timing issues.
Separate the tags for build and binary images.
builddocker:
docker build -t eirwin/netverify-build -f ./Dockerfile.build .
CID=$$(docker create eirwin/netverify-build); \
docker cp $$CID:/netverify .; \
docker rm $$CID
chmod 755 ./netverify
docker build --rm=true --tag=eirwin/netverify -f Dockerfile.static .
Your binary Dockerfile.static can start with the scratch blank image.
FROM scratch