@lendi/serverless-simplify-default-exec-role-plugin
v1.0.0
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serverless-simplify-default-exec-role-plugin
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serverless-simplify-default-exec-role-plugin
** This is a fork of serverless-simplify-default-exec-role-plugin by woebot
which in itself was 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 @lendi/serverless-simplify-default-exec-role-plugin
Usage
In your serverless.yml
file:
plugins:
- "@lendi/serverless-simplify-default-exec-role-plugin"
IAM simplification for logs:
statements
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:*",
},
],
}
IAM simplification for kinesis:*
statements
Needs more testing
When you attach a kinesis stream as an event source, it creates an IAM policy per kinesis stream
Before
{
"Effect": "Allow",
"Action": [
"kinesis:GetRecords",
"kinesis:GetShardIterator",
"kinesis:DescribeStreamSummary",
"kinesis:ListShards"
],
"Resource": [
"arn:aws:kinesis:<region>:<account>:stream/<stream-name>"
]
},
...many depending on number of input events to lambdas
{
"Effect": "Allow",
"Action": [
"kinesis:GetRecords",
"kinesis:GetShardIterator",
"kinesis:DescribeStreamSummary",
"kinesis:ListShards"
],
"Resource": [
"arn:aws:kinesis:<region>:<account>:stream/<stream-name>"
]
},
After
{
"Effect": "Allow",
"Action": [
"kinesis:GetRecords",
"kinesis:GetShardIterator",
"kinesis:DescribeStreamSummary",
"kinesis:ListShards"
],
"Resource": [
"arn:aws:kinesis:<region>:<account>:stream/<stream-name>"
]
},
tests
We have every intention of creating more tests to validate this plugin...
License
MIT ©