* failed to open vchiq instance

Question

Hi,  
  
I was trying to do edge ML following the instruction below.  
https://docs.aws.amazon.com/greengrass/v1/developerguide/ml-dlc-console.html  
  
I had no problem doing it with Lambda without GG container, but had the error message '* failed to open vchiq instance' when trying to do the same thing with Lambda inside of the GG container.  
  
I used 0(root) for UID/GID for Lambda. I added camera device and ML model as resources to GGG. I also chmod 777 /dev/vchiq on my RaspberryPi.  
  
I'm stuck. I'd be happy if I could get some help:)

popanmol · Answer

Hi,  
  
Please make sure you follow the instructions for containerized lambda here https://docs.aws.amazon.com/greengrass/v1/developerguide/ml-dlc-console.html#ml-console-dlc-config-lambda. Specifically choose **Use group default** for **Run as** instead of using 0 for UID/GUID.  
  
Also make sure you're adding both /dev/vcsm and /dev/vchiq as resources to the GG group with correct file access permissions and Lambda function affiliations, as documented here https://docs.aws.amazon.com/greengrass/v1/developerguide/ml-dlc-console.html#ml-console-dlc-add-cam-resource.  
  
Thanks,  
Anmol

hdmn54321 · Answer

Anmol,  
  
Thank you again. The problem was solved! I thought running Lambda as root clears all the permission problems.  
  
I ran Lambda as group default(ggc_user), after adding /dev/vcsm and /dev/vchiq resource to the GGG, and it worked.  
  
It took a while for me to understand adding volume and device resource to GGG is purely for the sake of container, while adding ML model resource to GGG is not.  
  
Thanks:)  
  
HM

* failed to open vchiq instance

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