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      UserData:
        Fn::Base64:
          Fn::Sub:
            - |
              #!/bin/bash -xe
              echo ECS_CLUSTER=${EcsCluster} >> /etc/ecs/ecs.config
              yum install -y aws-cfn-bootstrap ec2-instance-connect awscli
              amazon-linux-extras install epel
              yum install -y s3fs-fuse
              mkdir -p /srv/omaha_s3

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# Change to /home directory
$ cd /home

# Change to previous directory
$ cd -

# Go up one level of the directory tree
$ cd ..

# Print's current directory you are in

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# Display Linux system information
:> uname -a 

# Display kernel release information 
:> uname -r 

# Show which version of Ubuntu installed (Similar command is available to other distros)
:> cat /etc/lsb_release
:> lsb_release -a

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const fetchServerInformation = async (url: URL): Promise<[finalURL: URL, version: string]> => {
  // ...
  
  const endpoint = new URL('api/info', url);

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AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Description: Lambda to send notification for ElastiCache Events

Parameters:
  EnvironmentName:
    Type: String
  
  EnvironmentType:

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Resources:
  LambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: src/
      Handler: main
      Runtime: go1.x
      Environment:
        Variables:
          WEBHOOK_URL: !Ref WebhookUrl

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  Topic:
    Type: AWS::SNS::Topic
    Properties:
      TopicName: !Sub ${AWS::StackName}
      DisplayName: A topic that receives ElastiCache Events and triggers lambda to send notification.
      Subscription:
          - Endpoint: !GetAtt LambdaFunction.Arn
            Protocol: lambda
      Tags:
        - Key: EnvironmentName

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  LambdaPermission:
    Type: AWS::Lambda::Permission
    Properties:
        Action: 'lambda:InvokeFunction'
        FunctionName: !Ref LambdaFunction
        Principal: sns.amazonaws.com
        SourceArn: !Ref Topic

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Outputs:
  TopicArn:
    Value: !Ref Topic
    Export:
      Name: !Sub "${EnvironmentName}:ElastiCache:Events:TopicArn"

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package main

import (
  "github.com/aws/aws-lambda-go/lambda"
  "github.com/aws/aws-lambda-go/events"
)

func handler(snsEvent events.SNSEvent) (error) {
  return nil
}