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

by XDK 2. October 2019 10:03

Explanation:

Verify the logs at the following location to debug the instance launch
/var/log/cloud-init.log
/var/log/cfn-init.log

 

Tags: ,

Amazon Web Service | CloudFormation

EC2 instances launched in the subnet missing public IPv4 address

by XDK 18. September 2019 22:09

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

Solution:
Add the following argument/property

CloudFormation:

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

PubSubnetZoneA:
Type: 'AWS::EC2::Subnet'
Properties:
AvailabilityZone:
Fn::Select:
- '0'
- Fn::GetAZs:
Ref: 'AWS::Region'
CidrBlock: '10.0.10.0/24'
MapPublicIpOnLaunch: 'True'
VpcId:
Ref: 'VPC'
Tags:
- Key: 'Name'
Value:
'Fn::Join': [ ':', [ 'Public', 'Zone A', !Ref 'AWS::StackName' ] ]

Terraform:

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 = "${aws_vpc.vpc.id}"
map_public_ip_on_launch = true
cidr_block = "10.0.10.0/24"
availability_zone = "${data.aws_availability_zones.available.names[0]}"
tags = {
Name = "public-subnet-a:${var.labname}"
}
}

Tags:

Amazon Web Service | Terraform | CloudFormation

About the author

My name is Xavier Dilip Kumar Jayaraj having 13+ 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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Disclaimer

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.