How to run golang server in docker

I setup a simple server with golang:

package main

import (
	"golang-server/database"
	"golang-server/helper"
	"log"
	"net/http"
)

func main() {
	database.Connect()
	port := helper.GetPort()

	SetupRoutes()

	log.Printf("connect to http://localhost:%s/ for GraphQL playground", port)
	log.Fatal(http.ListenAndServe(":"+port, router))

}

Here is what my folder structure look like:

Here is what my dockerfile look like:

FROM golang:1.18

WORKDIR $GOPATH/src

COPY . .

RUN go mod download
RUN go build -o /golang-server

EXPOSE 8080

CMD ["golang-server"]

I am running these docker commands in the main directory:

docker build . -t golang-server 

docker run --network=golang-server --name=golang-server golang-server

However I am getting this error when I run:

docker: Error response from daemon: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "golang-server": executable file not found in $PATH: unknown.

What should I set the dockerfile so I can successfully deploy to docker?

The problem is related with your last line in Dockerfile CMD ["golang-server"]. When you put it there, the system (inside of the container) are trying to find an executable file inside of your $PATH variable called golang-server.

To solve this issue, you can just edit your last line from your Dockerfile to CMD ["/golang-server"], once you are building your application in / (RUN go build -o /golang-server). The final Dockerfile should be something like:

FROM golang:1.18

WORKDIR $GOPATH/src

COPY . .

RUN go mod download
RUN go build -o /golang-server

EXPOSE 8080

CMD ["/golang-server"]