Running CDKTF on AWS Lambda

Terraform CDK for Terraform
1

Hi,

I’m attempting to run cdktf synth on an AWS Lambda function, targeting the writeable tmp folder for the output as all other folders on the Lambda are read-only. However, running the command throws an error where cdktf seemingly attempts to write something to the home folder : “Error: EROFS: read-only file system, mkdir ‘/home/sbx_user1051’”.

Is this expected behavior?

The full command: cdktf synth --output ~/tmp/cdktf/cdktf.out

2

Hi @nbaju1 :wave:

This is probably the caching of the version check that’s happening. It writes to the CDKTF_HOME directory (which by default is ~/.cdktf if I remember correctly). You can either set that directory to a writable one or try disabling the version check via the env var DISABLE_VERSION_CHECK=true.

– Ansgar

3

Thanks, @ansgarm!

I ended up disabling CDKTF_DISABLE_PLUGIN_CACHE_ENV and setting CDKTF_HOME to the writable tmp directory on the Lambda, which did the trick.