starting container process caused "exec: \"/app\": permission denied": unknown

Question

When I was trying to build golang using docker

The image build of docker was successful, but the following error occurred when running with docker run

docker: Error response from daemon: OCI runtime create failed: container_linux.go:345: starting container process caused "exec: \"/app\": permission denied": unknown.

I think this error cause no user add, so I added group and user as below

RUN groupadd -g 10001 myapp \
    && useradd -u 10001 -g myapp myapp

but didn't fix.

Here is my source docker file

FROM golang:1.12.9 as builder

ADD . /go/src/appname/

WORKDIR /go/src/appname/

ENV GO111MODULE=on

COPY go.mod .
COPY go.sum .

RUN go mod download
COPY . .

RUN  CGO_ENABLED=0 GOOS=linux GOARCH=amd64 make build target=prod

FROM alpine

RUN apk update \
  && apk add --no-cache

COPY --from=builder /go/src/ /app

ENTRYPOINT [ "/app" ]

thanks

Answer 1

Thanks to the advice of everyone, I fix this issue

I couldn't just COPY with the build binary properly specified

before

COPY --from=builder /go/src/ /app

after

COPY --from=builder /go/src/build/build_app_name /app

thanks!!

Answer 2

You need to specify the output directory to your binary.

RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o /app .

then copy the app directory

COPY --from=builder /app ./
RUN chmod +x ./app
ENTRYPOINT ["./app"]

Answer 3

You are copying your entire source folder into the directory /app in this step:

COPY --from=builder /go/src/ /app

Then you try to execute the directory:

ENTRYPOINT [ "/app" ]

Instead, you need to copy the compiled binary that your go build outputs in the copy step.