Unable to run k6 test using docker image

mandarbhalerao · October 16, 2024, 11:29pm

I am trying to run a k6 test using the grafana/k6 docker image. I am testing a gRPC service running locally. Here’s the command that I have tried:

docker run -i -v /Users/mandar.bhalerao/k6_test:/files -w /files grafana/k6 run --vus 10 --duration 30s - <script.js

The proto file exists in the k6_test folder. I have volume-mounted the folder which also consists the script.js file. In my script.js, I am trying to connect to the local gRPC server, here are the relevant parts of the code:

const client = new Client();
client.load(null,'mmdb.proto'); 

if (exec.vu.iterationInScenario === 0) {
    console.log('Attempting to connect to gRPC server...');
    client.connect('host.docker.internal:7900', {});
    console.log('Connection successful');
  }

I am not able to connect to the server succesfully. I can only see the Attempting to connect to gRPC server... logs for each VU. The test runs totally fine when executed without docker image from the terminal.

I have tried checking tcpdump when I run the test, the tcpdump does show packets transferred on localhost port 7900 where I am trying to connect. What am I missing here?

Note: I am using Mac OS

Here’s the output of running the test:

        /\      Grafana   /‾‾/  
    /\  /  \     |\  __   /  /   
   /  \/    \    | |/ /  /   ‾‾\ 
  /          \   |   (  |  (‾)  |
 / __________ \  |_|\_\  \_____/ 

     execution: local
        script: -
        output: -

     scenarios: (100.00%) 1 scenario, 10 max VUs, 1m0s max duration (incl. graceful stop):
              * default: 10 looping VUs for 30s (gracefulStop: 30s)

time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console
time="2024-10-16T22:51:57Z" level=info msg="Attempting to connect to gRPC server..." source=console

running (0m01.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [   3% ] 10 VUs  01.0s/30s

running (0m02.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [   7% ] 10 VUs  02.0s/30s

running (0m03.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  10% ] 10 VUs  03.0s/30s

running (0m04.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  13% ] 10 VUs  04.0s/30s

running (0m05.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  17% ] 10 VUs  05.0s/30s

running (0m06.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  20% ] 10 VUs  06.0s/30s

running (0m07.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  23% ] 10 VUs  07.0s/30s

running (0m08.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  27% ] 10 VUs  08.0s/30s

running (0m09.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  30% ] 10 VUs  09.0s/30s

running (0m10.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  33% ] 10 VUs  10.0s/30s

running (0m11.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  37% ] 10 VUs  11.0s/30s

running (0m12.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  40% ] 10 VUs  12.0s/30s

running (0m13.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  43% ] 10 VUs  13.0s/30s

running (0m14.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  47% ] 10 VUs  14.0s/30s

running (0m15.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  50% ] 10 VUs  15.0s/30s

running (0m16.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  53% ] 10 VUs  16.0s/30s

running (0m17.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  57% ] 10 VUs  17.0s/30s

running (0m18.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  60% ] 10 VUs  18.0s/30s

running (0m19.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  63% ] 10 VUs  19.0s/30s

running (0m20.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  67% ] 10 VUs  20.0s/30s

running (0m21.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  70% ] 10 VUs  21.0s/30s

running (0m22.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  73% ] 10 VUs  22.0s/30s

running (0m23.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  77% ] 10 VUs  23.0s/30s

running (0m24.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  80% ] 10 VUs  24.0s/30s

running (0m25.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  83% ] 10 VUs  25.0s/30s

running (0m26.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  87% ] 10 VUs  26.0s/30s

running (0m27.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  90% ] 10 VUs  27.0s/30s

running (0m28.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  93% ] 10 VUs  28.0s/30s

running (0m29.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [  97% ] 10 VUs  29.0s/30s

running (0m30.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default   [ 100% ] 10 VUs  30.0s/30s

running (0m31.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m32.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m33.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m34.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m35.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m36.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m37.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m38.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m39.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m40.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m41.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m42.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m43.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m44.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m45.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m46.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m47.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m48.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m49.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m50.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m51.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m52.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m53.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m54.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m55.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m56.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m57.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m58.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (0m59.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s

running (1m00.0s), 10/10 VUs, 0 complete and 0 interrupted iterations
default ↓ [ 100% ] 10 VUs  30s
time="2024-10-16T22:52:57Z" level=warning msg="No script iterations fully finished, consider making the test duration longer"

     data_received...: 131 kB 2.2 kB/s
     data_sent.......: 23 kB  388 B/s
     vus.............: 10     min=10   max=10
     vus_max.........: 10     min=10   max=10


running (1m00.0s), 00/10 VUs, 0 complete and 10 interrupted iterations
default ✓ [ 100% ] 10 VUs  30s

joanlopez · October 17, 2024, 11:26am

Hi @mandarbhalerao,

Welcome to our community, thanks for sharing your question here

Let me ask, before moving into the details, perhaps a stupid question:

Have you tried to run a gRPC client from within the Docker container, and tried to successfully connect with the service? I just did a quick test with the gRPC example service we have in the repository, along the k6 codebase, within a Docker container, and it worked.

Thanks!

mandarbhalerao · October 17, 2024, 5:30pm

Hi @joanlopez , you mean running the gRPC server within the container right? No, I haven’t tried that. My gRPC server runs on my localhost outside of any container.

joanlopez · October 17, 2024, 10:49pm

Hi @mandarbhalerao,

Then, I’d suggest that, to make sure the error is at k6 layer.

I know you mentioned tcpdump, but I guess that’s not actually fully proofing the gRPC connection is established successfully from within the container, despite of what k6 does. Right?

Thanks!

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