How to verify cfn-init & cfn-signal commands, executed successfully on the instance?

by XDK 2. October 2019 10:03


Verify the logs at the following location to debug the instance launch


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Amazon Web Service | CloudFormation

EC2 instances launched in the subnet missing public IPv4 address

by XDK 18. September 2019 22:09

EC2 instances launched in the subnet using Terraform or Cloudformation is missing public IPv4 address

Add the following argument/property


MapPublicIpOnLaunch - Indicates whether instances launched in this subnet receive a public IPv4 address.

Type: 'AWS::EC2::Subnet'
- '0'
- Fn::GetAZs:
Ref: 'AWS::Region'
CidrBlock: ''
MapPublicIpOnLaunch: 'True'
Ref: 'VPC'
- Key: 'Name'
'Fn::Join': [ ':', [ 'Public', 'Zone A', !Ref 'AWS::StackName' ] ]


map_public_ip_on_launch - (Optional) Specify true to indicate that instances launched into the subnet should be assigned a public IP address. Default is false.

resource "aws_subnet" "public-subnet-a" {
vpc_id = "${}"
map_public_ip_on_launch = true
cidr_block = ""
availability_zone = "${data.aws_availability_zones.available.names[0]}"
tags = {
Name = "public-subnet-a:${var.labname}"


Amazon Web Service | Terraform | CloudFormation

About the author

My name is Xavier Dilip Kumar Jayaraj having 16+ years of IT experience which includes solid experience and depth Knowledge in Application Life Cycle Management, Configuration Management, Implementation and Support using TFS on-premises and Azure DevOps. I have invested in gaining DevOps knowledege to expertise with Cloud Computing providers namely Microsoft Azure and Amazon Web Services in recent years. I am very positive to learn and adapt emerging technologies to client’s environment.

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The information provided here is based on my expreriences, troubleshooting and online/offline findings. It can be used as is on your own risk without any warranties and I impose no rights.