For this part, is it possible to replace "lab-logs-bucket" with "mychallengebucketname" (not in the gs:// format? Why does it need to be in the key-value attribute format?
Metadata should be set in the "lab-logs-bucket" attribute using the "gs://mybucketname/" format.
log_bucket_metadata_name=lab-logs-bucket
log_bucket_metadata_url="http://metadata.google.internal/computeMetadata/v1/instance/attributes/${log_bucket_metadata_name}"
worker_log_bucket=$(curl -H "Metadata-Flavor: Google" "${log_bucket_metadata_url}")
2 Answers
"lab-logs-bucket" is hard coded in startup script as a metadata key. What you need to provide is the bucket (gs://mybucketname/) you created as a value for the instance to retrieve from metadata list. So you should not replace it.
In my lab I set metadata lab-logs-bucket=gs://jay-startup The key was lab-logs-bucket. The value was bucket name including gs. You can pass the bucket name as any key. For example mybucket=gs://jay-startup . This would require modifying the startup script to look for value of that key mybucket.