I've the following docker file which is working for my application. I was able to access to the simple web app server.
FROM golang:1.14.7 AS builder
RUN go get github.com/go-delve/delve/cmd/dlv
RUN mkdir /app
ADD . /app
WORKDIR /app
RUN CGO_ENABLED=0 GOOS=linux go build -gcflags="all=-N -l" -o main ./...
FROM alpine:3.12.0 AS production
COPY --from=builder /app .
EXPOSE 8000 40000
ENV PORT=8000
CMD ["./main"]
When I adopt it like following, I am not able to deploy it successfully to Kubernetes. The container crashed with some general error, not something that I can use.
standard_init_linux.go:190: exec user process caused "no such file or directory"
This not working
FROM golang:1.14.7 AS builder
RUN go get github.com/go-delve/delve/cmd/dlv
RUN mkdir /app
ADD . /app
WORKDIR /app
RUN CGO_ENABLED=0 GOOS=linux go build -gcflags="all=-N -l" -o main ./...
FROM alpine:3.12.0 AS production
COPY --from=builder /app .
COPY --from=builder /go/bin/dlv /
EXPOSE 8000 40000
ENV PORT=8000
CMD ["/dlv", "--listen=:40000", "--headless=true", "--api-version=2", "--accept-multiclient", "exec", "./main"]
If someone want to try it out this is the simple program (this is minimum reproducible example), if you take the first docker file it will work for you, for the second it does not.
package main
import (
"fmt"
"net/http"
"os"
)
func main() {
fmt.Println("app is starting!")
var port string
if port = os.Getenv("PORT"); len(port) == 0 {
port = "8080"
}
http.HandleFunc("/", handler)
http.ListenAndServe(":"+port, nil)
}
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hi there, %s!", r.URL.Path[1:])
}
