serverless-simplify-default-exec-role-plugin

** This is a fork of serverless-simplify-default-exec-role-plugin by shelfio **

A quick solution for the IamRoleLambdaExecution error: Maximum policy size of 10240 bytes exceeded.

• This plugin modifies the IamRoleLambdaExecution policy to reduce its size.
• Unlike the original version, this maintains any custom IAM statements attached to the Lambda role.
• It also doesn't collapse "logs:CreateLogStream", "logs:CreateLogGroup", and "logs:PutLogEvents" permissions into the same IAM statement.

Installation

$ npm install --dev @woebot/serverless-simplify-default-exec-role-plugin

Usage

In your serverless.yml file:

plugins:
  - "@woebot/serverless-simplify-default-exec-role-plugin"

More info

By default the Serverless framework adds something like the IAM statement below in order to allow write access to CloudWatch log groups that are part of the deployment stack. For stacks with a lot of lambda functions, this can cause the role to exceed the maximum allowed size of 10240 bytes. This plugin reduces the size of the generated lambda role by replacing the resource list with a single ARN to grants write access to all log groups that are part of the same region and account.

Before

{
  "Effect": "Allow",
  "Action": ["logs:CreateLogStream", "logs:CreateLogGroup"],
  "Resource": [
    {
      "Fn::Sub": "arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/production-users-createUser:*",
    },
    {
      "Fn::Sub": "arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/production-users-updateUser:*",
    },
    {
      "Fn::Sub": "arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/production-users-deleteUser:*",
    },
    // ... and so on, for each lambda function that logs to cloudwatch
  ],
}

After

{
  "Effect": "Allow",
  "Action": ["logs:CreateLogStream", "logs:CreateLogGroup"],
  "Resource": [
    {
      "Fn::Sub": "arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:*",
    },
  ],
}

License

MIT ©