Integration with Prometheus via statsd exporter about k6-operator

[jmdacruz]

thanks @dgzlopes, I completely missed the -e argument! And yes, it would be ideal to be able to replace the image on the operator. I'll see if I can put together a PR for this.

[simskij]

Yeah, using -e won't work, just as you point out @mikaelkundert. What that does is that it allows the k6 script to use it as an environment variable. However, the statsd output is initiated outside of the actual test script. I'll raise an issue about adding support for env vars in the CRD.

[dgzlopes]

Hey :)

You can pass env vars as arguments in k6. Something like this should work:

apiVersion: k6.io/v1alpha1
kind: K6
metadata:
  name: k6-sample
spec:
  parallelism: 4
  script: k6-test
  arguments: -e K6_STATSD_ADDR=something --out statsd

Another approach is to create an image with a custom k6 build that includes https://github.com/szkiba/xk6-prometheus. Then, you can use that img on the operator and scrape the metrics from the pods as usual. But idk if we have support to swap the image used by the operator (cc @simskij).

[dgzlopes]

Now that #17 has been merged, we can close this :)

btw, thanks for raising the issue!

[mikaelkundert]

I did not get -e argument working.

I got following errors:

time="2021-06-04T14:51:39Z" level=error msg="Couldn't flush a batch" error="write udp 127.0.0.1:36848->127.0.0.1:8125: write: connection refused" output=statsd

While having following manifest:

apiVersion: k6.io/v1alpha1
kind: K6
metadata:
  name: k6-sample
spec:
  parallelism: 4
  script: crocodile-stress-test
  arguments: -e K6_STATSD_ADDR=graphite-1622816495:8125 --out statsd

This popped up job with commands:

k6 run --quiet --execution-segment=0:1/4 --execution-segment-sequence=0,1/4,2/4,3/4,1 -e K6_STATSD_ADDR=graphite-1622816495:8125 --out statsd /test/test.js --address=0.0.0.0:6565 --paused

/\ |‾‾| /‾‾/ /‾‾/
/\ / \ | |/ / / /
/ \/ \ | ( / ‾‾\
/ \ | |\ \ | (‾) |
/ __________ \ |__| \__\ \_____/ .io
execution: local
script: /test/test.js
output: statsd (localhost:8125)

But this doesn't work locally either. Unless I run the command as follow:

$ K6_STATSD_ADDR=graphite-1622816495:8125 k6 run --quiet --execution-segment=0:1/4 --execution-segment-sequence=0,1/4,2/4,3/4,1 -e K6_STATSD_ADDR=graphite-1622816495:8125 --out statsd ./test.js --address=0.0.0.0:6565 --paused

          /\      |‾‾| /‾‾/   /‾‾/   
     /\  /  \     |  |/  /   /  /    
    /  \/    \    |     (   /   ‾‾\  
   /          \   |  |\  \ |  (‾)  | 
  / __________ \  |__| \__\ \_____/ .io

ERRO[0000] The moduleSpecifier "./test.js" couldn't be found on local disk. Make sure that you've specified the right path to the file. If you're running k6 using the Docker image make sure you have mounted the local directory (-v /local/path/:/inside/docker/path) containing your script and modules so that they're accessible by k6 from inside of the container, see https://k6.io/docs/using-k6/modules#using-local-modules-with-docker.

[mikaelkundert]

I noticed that error message was about missing test.js, but here's the actual error message that indicates that latter command should work.

$ K6_STATSD_ADDR=graphite-1622816495:8125 k6 run --quiet --execution-segment=0:1/4 --execution-segment-sequence=0,1/4,2/4,3/4,1 -e K6_STATSD_ADDR=graphite-1622816495:8125 --out statsd ./test.js --address=0.0.0.0:6565 --paused

          /\      |‾‾| /‾‾/   /‾‾/   
     /\  /  \     |  |/  /   /  /    
    /  \/    \    |     (   /   ‾‾\  
   /          \   |  |\  \ |  (‾)  | 
  / __________ \  |__| \__\ \_____/ .io

ERRO[0000] Couldn't make buffered client, lookup graphite-1622816495 on 127.0.0.53:53: server misbehaving  output=statsd
ERRO[0000] lookup graphite-1622816495 on 127.0.0.53:53: server misbehaving