Dockerfile used to build the image
# syntax=docker/dockerfile:1
FROM debian:bullseye as browser
RUN apt-get update && \
apt-get install -y chromium
ENV XK6_HEADLESS=true
FROM golang:1.18 as builder
# build k6 0.36.0 with prometheus support
ENV K6_VERSION=v0.36.0
RUN go install go.k6.io/xk6/cmd/xk6@latest && xk6 build --with github.com/grafana/xk6-browser
WORKDIR /build
ENV CGO_ENABLED=0
ENV GOOS=linux
COPY . .
RUN cd cmd/agent;go build -o /build/runner -mod mod -a .
FROM loadimpact/k6:0.36.0
WORKDIR /home/k6
COPY --from=builder /go/k6 /usr/bin/k6
COPY --from=builder /build/runner /bin/runner
ENTRYPOINT ["/bin/runner"]
Output:
Script Used
import { sleep } from 'k6';
import { chromium } from 'k6/x/browser';
import { Counter, Rate, Trend } from "k6/metrics";
//let timeToFirstByte = new Trend("time_to_first_byte", true);
export default function () {
const browser = chromium.launch({
headless: true, // false if you wish to view the browser
slowMo: '500ms',
});
const context = browser.newContext();
const page = context.newPage();
page.goto('https://test.k6.io/');
const elem = page.$('a[href="/my_messages.php"]');
page.screenshot({ path: `example-chromium.png` });
elem.click();
sleep(1)
page.screenshot({ path: `example-chromium1.png` });
sleep(10);
page.close();
browser.close();
}
Could you please let me know how can resolve the "GoError: launching browser: exec: no command " Error and run the browser test in non-gui mode
ankur
November 17, 2022, 11:54am
3
Hi @chandana194 ,
Welcome to the forum!
Thanks for your question. We need to get some more information from you to be able to replicate the issue on our side. Could you please fill in the gaps:
What host OS is your computer running on?
What is this agent that you are building and running alongside k6?
Can you give us the exact step-by-step command line instructions as to how you’re building and running the docker image and test?
I tried your test (with some alterations to goto since it is now async) and it worked on my Mac laptop. These are the steps i took:
Clone the xk6-browser github project:git clone https://github.com/grafana/xk6-browser.git
Create a test file (test.js) in the root of the cloned project and copy the following test into it:import { sleep } from 'k6';
import { chromium } from 'k6/x/browser';
import { Counter, Rate, Trend } from "k6/metrics";
//let timeToFirstByte = new Trend("time_to_first_byte", true);
export default function () {
const browser = chromium.launch({
headless: true, // false if you wish to view the browser
slowMo: '500ms',
});
const context = browser.newContext();
const page = context.newPage();
page.goto('https://test.k6.io/').then(() => {
const elem = page.$('a[href="/my_messages.php"]');
page.screenshot({ path: `example-chromium.png` });
elem.click();
sleep(1)
page.screenshot({ path: `example-chromium1.png` });
sleep(10);
}).finally(() => {
page.close();
browser.close();
})
}
Now build and run the test using docker-compose:docker-compose run -T xk6-browser run - <test.js
It should run the test without any errors.
Cheers,
Hi
I’ve encountered a similar issue.
Having installed k6 v0.43.1 ((devel), go1.20.1, darwin/arm64) on my Mac with the M1, I do receive:
ERRO[0001] Uncaught (in promise) GoError: launching browser: exec: no command
running at github.com/grafana/xk6-browser/browser.mapBrowserType.func1 (native)
I have imported import { chromium } from 'k6/experimental/browser'; and trying to instanciate it with const browser = chromium.launch({ headless: true });
The same script does, however, work with your provided solution by using docker-compose. But in the end, it should be working either way
ankur
March 14, 2023, 11:50am
6
Hi @Lukas.kaeppeli ,
welcome to the forum!
Can you share the Dockerfile you are working with? It looks like the image you are using doesn’t contain a chromium (or chrome) browser.
Try working with this Dockerfile:
FROM grafana/k6:0.43.1
USER root
RUN apk update && apk add --no-cache chromium
ENV K6_BROWSER_ENABLED=true
Build it with:
docker build -t browser-k6 -f Dockerfile .
Run a test with:
docker run --rm -i browser-k6 run - </path/to/script.js
Cheers,
EDIT: edited the docker run command above to work with -i and not -t.
Hi Ankur
Thanks for your quick response. I am not working with a Dockerfile at all. I have installed k6 with homebrew. As of version 0.43.0, it should come pre-installed with a browser (or I have misread the documentation).
However, when following your approach that you explained above (by using GitHub - grafana/xk6-browser: k6 extension that adds support for browser automation and end-to-end web testing via the Chrome Devtools Protocol ), everything works fine
ankur
March 15, 2023, 12:37pm
8
Hi @Lukas.kaeppeli ,
k6 and the k6-browser module do not come with a pre-installed browser, it works with the existing Chrome/Chromium browser installed on your system.
I’m glad the docker method worked for you
Cheers,
Hi @ankur
docker build -t browser-k6 -f Dockerfile .
docker run --rm -t browser-k6 run - <script.js
But the script is not running, seem it stays loading.I used your docker file example:
FROM grafana/k6:0.43.0
USER root
RUN apk update && apk add --no-cache chromium
ENV K6_BROWSER_ENABLED=true
My script.js is :
import { chromium } from 'k6/experimental/browser';
export default async function () {
const browser = chromium.launch({ headless: true });
const page = browser.newPage();
try {
await page.goto('https://test.k6.io/my_messages.php', { waitUntil: 'networkidle' });
// Enter login credentials
page.locator('input[name="login"]').type('admin');
page.locator('input[name="password"]').type('123');
page.screenshot({ path: 'screenshot.png' });
} finally {
page.close();
browser.close();
}
}
could you please help with it ?
Hi @vsanabria ,
I think there was a confusion on the docker run command, you have to use the -i flag in order for the container to be able to read from stdin like:
docker run --rm -i browser-k6 run - <script.js
Let me know if that works.
2 Likes
yes, it worked, thank you!!!
