[SOLVED] The provided execution role does not have permissions to call DescribeNetworkInterfaces on EC2

The provided execution role does not have permissions to call DescribeNetworkInterfaces on EC2

When I input any code in this function (e.g. console.log();) and click "Save", an error occurs:

The provided execution role does not have permissions to call DescribeNetworkInterfaces on EC2

exports.handler = (event, context, callback) => {
  callback(null, 'Hello from Lambda');
  console.log(); // here is my code   
};

I bound the function with Role: lambda_excute_execution(Policy:AmazonElasticTranscoderFullAccess).

And this function is not bound with any triggers now.

And then, I give the role AdministratorAccess Policy, I can save my source code correctly.

This role could run Functions successfully before today.

Does anyone know this error?

Solution

This error is common if you try to deploy a Lambda in a VPC without giving it the required network interface related permissions ec2:DescribeNetworkInterfaces, ec2:CreateNetworkInterface, and ec2:DeleteNetworkInterface (see AWS Forum).

For example, this a policy that allows to deploy a Lambda into a VPC:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "ec2:DescribeNetworkInterfaces",
        "ec2:CreateNetworkInterface",
        "ec2:DeleteNetworkInterface",
        "ec2:DescribeInstances",
        "ec2:AttachNetworkInterface"
      ],
      "Resource": "*"
    }
  ]
}