Dockerfile for Go and chromedp

I'm trying to implement a Dockerfile to contain both my go binary and also chromedp. I manage to build the image and I can run the image and the go binary runs as expected, all but chromedp.

Thanks in advance!

Error message i recieve:
Error exec: "google-chrome": executable file not found in $PATH running chromedp

Dockerfile

# syntax=docker/dockerfile:1


##
## Build
##
FROM golang:1.17-bullseye as build

WORKDIR /app
COPY . ./

RUN go mod download

COPY *.go ./

RUN go build -o /docker-scraper

EXPOSE 8080

FROM chromedp/headless-shell:latest

CMD ["/docker-scraper"]

##
## Deploy
##
FROM gcr.io/distroless/base-debian11

WORKDIR /

COPY --from=build /docker-scraper /docker-scraper

EXPOSE 8080

USER nonroot:nonroot

ENTRYPOINT ["/docker-scraper"]

Solution

Error exec: "google-chrome": executable file not found in $PATH running chromedp

This is because you did not run your go program in chromedp/headless-shell. You define multi-stage builds, but with this, only the last stage will be act as the base image of final image.

This means your go program in fact runs in gcr.io/distroless/base-debian11, not headless-shell.

To learn how to run your own program in headless-shell, you could refers to its official document:

When using chromedp/headless-shell as a base image to build an image that runs your own program, You could experience zombie process problem. To reap zombie processeses, use dumb-init or tini on your Dockerfile's ENTRYPOINT
FROM chromedp/headless-shell:latest
...
# Install dumb-init or tini
RUN apt install dumb-init
# or RUN apt install tini
...
ENTRYPOINT ["dumb-init", "--"]
# or ENTRYPOINT ["tini", "--"]
CMD ["/path/to/your/program"]

A minimal workable example as next.

main.go:

package main

import (
        "context"
        "log"
        "fmt"
        "time"

        "github.com/chromedp/chromedp"
)

func main() {
        ctx, cancel := chromedp.NewContext(
                context.Background(),
                chromedp.WithLogf(log.Printf),
        )
        defer cancel()

        ctx, cancel = context.WithTimeout(ctx, 15*time.Second)
        defer cancel()

        err := chromedp.Run(ctx,
                chromedp.Navigate(`https://golang.org/pkg/time/`),
        )
        if err != nil {
            fmt.Println(err)
        }
        fmt.Println("done")
}

Dockerfile:

FROM golang:latest as build

WORKDIR /go/src/app
COPY ./main.go .
RUN go mod init docker-scraper; go mod tidy
RUN go build

FROM chromedp/headless-shell:latest
RUN apt-get update; apt install dumb-init -y
ENTRYPOINT ["dumb-init", "--"]
COPY --from=build /go/src/app/docker-scraper /tmp
CMD ["/tmp/docker-scraper"]

docker-compose.yaml:

version: '3'
services:
  goservice:
    build: .

Execution:

$ docker-compose up
Recreating chromedp-docker_goservice_1 ... done
Attaching to chromedp-docker_goservice_1
goservice_1  | done
chromedp-docker_goservice_1 exited with code 0

You could see no error about google-chrome now.