Things I’ve found out when using the IAM role, thanks to SnapLogic documentation:
‘If enabled, IAM role stored in the EC2 instance is used to access S3 bucket. Access-key ID and Secret key are required to be empty if this property is selected.
The List, Read and Write permissions are required as per the attached S3 policy for the IAM role stored on the EC2 instance.
This property is valid only in EC2-type Groundplex. In the groundplex, the following line should be added to global.properties and restart jcc : jcc.jvm_options = -DIAM_CREDENTIAL_FOR_S3=TRUE’
