How do I install extensions when I'm running the k6 docker image?

rshock · July 27, 2021, 6:10pm

I’m using the loadimpact/k6 docker image and I’m trying to install this kafka extension from:
https://github.com/mostafa/xk6-kafka

I’m in a mess trying to build a custom image with this extension and I can’t get it working. Is there a simple way to get this working? I’m using Gitlab.

I want to be able to install one of these extensions without needing to make a custom k6 image.

Relevant github issue I opened with my Dockerfile and failure:

github.com/mostafa/xk6-kafka

Recommended approach for using this alongside the k6 docker image?

opened 03:53PM - 27 Jul 21 UTC

closed 05:11PM - 28 Jul 21 UTC

Schachte

I'm leveraging the k6 docker image as the base within my pipeline. I'm intereste…d in adding this k6 extension. I see the k6 base image doesn't have golang installed, so curious on the recommended approach for using this the best way. ## Example Dockerfile: ``` # This is a comment FROM ubuntu:latest # Setup k6 installation RUN apt-get update RUN DEBIAN_FRONTEND="noninteractive" apt-get -y install tzdata RUN apt-get install golang -y RUN apt-get install ca-certificates gnupg2 -y RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys C5AD17C747E3415A3642D57D77C6C491D6AC1D69 RUN echo "deb https://dl.k6.io/deb stable main" | tee /etc/apt/sources.list.d/k6.list RUN apt-get update RUN apt-get install k6 RUN apt-get install wget -y # Get newer golang version RUN wget https://dl.google.com/go/go1.16.4.linux-amd64.tar.gz RUN tar -xvf go1.16.4.linux-amd64.tar.gz RUN mv go /usr/local # Setup ENV ENV GOROOT=/usr/local/go ENV GOPATH=$HOME/go ENV PATH=$GOPATH/bin:$GOROOT/bin:$PATH # Verification of go RUN go version RUN go get github.com/k6io/xk6/cmd/xk6@latest RUN xk6 build --with github.com/mostafa/xk6-kafka@bb0ceb8 ENTRYPOINT [ "/bin/bash", "-l", "-c" ] ``` I'm getting the following error when running sample script from readme: ``` time="2021-07-27T18:48:49Z" level=debug msg="Initializing the runner..." time="2021-07-27T18:48:49Z" level=debug msg=Loading... moduleSpecifier="file:///home/scripts/test_json.js" originalModuleSpecifier=/home/scripts/test_json.js time="2021-07-27T18:48:50Z" level=debug msg="Babel: Transformed" t=192.005697ms time="2021-07-27T18:48:50Z" level=error msg="unknown module: k6/x/kafka\n\tat reflect.methodValueCall (native)\n\tat file:///home/scripts/test_json.js:65:65(26)\n" hint="script exception" ``` Thanks

nedyalko · July 30, 2021, 8:35am

What issues are you encountering exactly? Maybe GitHub - szkiba/xk6bundler: Bundle k6 with extensions as fast and easily as possible from @szkiba will be of help to you?

Nesodus · August 20, 2021, 2:09pm

Hello, Ryan.
This might come very late, but I’ve had the same question earlier and in conclusion decided to just create docker image with prebuilt binary, sample:

FROM golang:1.16-alpine as builder
WORKDIR $GOPATH/src/go.k6.io/k6
ADD . .
RUN apk --no-cache add git
RUN CGO_ENABLED=0 go install -a -trimpath -ldflags "-s -w -X go.k6.io/k6/lib/consts.VersionDetails=$(date -u +"%FT%T%z")/$(git describe --always --long --dirty)" 
RUN go install -trimpath github.com/k6io/xk6/cmd/xk6@latest
RUN xk6 build --with github.com/avitalique/xk6-file@latest
RUN cp k6 $GOPATH/bin/k6

FROM alpine:3.13
RUN apk add --no-cache ca-certificates && \
    adduser -D -u 12345 -g 12345 k6
COPY --from=builder /go/bin/k6 /usr/bin/k6

#no volumes because I initiate those in docker-compose separately, this is just for image
USER 12345
ENTRYPOINT ["k6"]

Most of the code in this Dockerfile was taken from original Dockerfile which you can get from k6 github.
Also you might get an error with “latest” version, but you can always get current(or your preferred) version from github of both k6 and modules (if you want to use ones already published).