Example Serverless update-stack.json

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "The AWS CloudFormation template for this Serverless application",
  "Resources": {
    "ServerlessDeploymentBucket": {
      "Type": "AWS::S3::Bucket"
    },
    "HelloLogGroup": {
      "Type": "AWS::Logs::LogGroup",
      "Properties": {
        "LogGroupName": "/aws/lambda/aws-nodejs-dev-hello"
      }
    },
    "IamRoleLambdaExecution": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "lambda.amazonaws.com"
                ]
              },
              "Action": [
                "sts:AssumeRole"
              ]
            }
          ]
        },
        "Policies": [
          {
            "PolicyName": {
              "Fn::Join": [
                "-",
                [
                  "dev",
                  "aws-nodejs",
                  "lambda"
                ]
              ]
            },
            "PolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": [
                    "logs:CreateLogStream"
                  ],
                  "Resource": [
                    {
                      "Fn::Sub": "arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/aws-nodejs-dev-hello:*"
                    }
                  ]
                },
                {
                  "Effect": "Allow",
                  "Action": [
                    "logs:PutLogEvents"
                  ],
                  "Resource": [
                    {
                      "Fn::Sub": "arn:${AWS::Partition}:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/aws-nodejs-dev-hello:*:*"
                    }
                  ]
                }
              ]
            }
          }
        ],
        "Path": "/",
        "RoleName": {
          "Fn::Join": [
            "-",
            [
              "aws-nodejs",
              "dev",
              "us-east-1",
              "lambdaRole"
            ]
          ]
        }
      }
    },
    "HelloLambdaFunction": {
      "Type": "AWS::Lambda::Function",
      "Properties": {
        "Code": {
          "S3Bucket": {
            "Ref": "ServerlessDeploymentBucket"
          },
          "S3Key": "serverless/aws-nodejs/dev/1536472931268-2018-09-09T06:02:11.268Z/aws-nodejs.zip"
        },
        "FunctionName": "aws-nodejs-dev-hello",
        "Handler": "handler.hello",
        "MemorySize": 1024,
        "Role": {
          "Fn::GetAtt": [
            "IamRoleLambdaExecution",
            "Arn"
          ]
        },
        "Runtime": "nodejs6.10",
        "Timeout": 6
      },
      "DependsOn": [
        "HelloLogGroup",
        "IamRoleLambdaExecution"
      ]
    },
    "HelloLambdaVersionIGuHLcUhocVp7xBbBIHpkdBE71UXu92gjXznQM911Y": {
      "Type": "AWS::Lambda::Version",
      "DeletionPolicy": "Retain",
      "Properties": {
        "FunctionName": {
          "Ref": "HelloLambdaFunction"
        },
        "CodeSha256": "EktX9VL1vtw8vZY/G2vD9aOup5zXDIU9NNJObrazJ4E="
      }
    }
  },
  "Outputs": {
    "ServerlessDeploymentBucketName": {
      "Value": {
        "Ref": "ServerlessDeploymentBucket"
      }
    },
    "HelloLambdaFunctionQualifiedArn": {
      "Description": "Current Lambda function version",
      "Value": {
        "Ref": "HelloLambdaVersionIGuHLcUhocVp7xBbBIHpkdBE71UXu92gjXznQM911Y"
      }
    }
  }
}