AWS game-changing feature of supporting YAML in Cloudformation is a blessing for people who would love to see things in a "proper" format with comments :). Also it reduces the number of lines when compared to JSON.
Thanks to Graham for his basic tutorial on YAML and CloudFormation, borrowed much of his code and added ansible install. I haven't used cfn-init in the below snippet. Will try to enhance the code in future and make it more sophisticated.
Please note: I have hard-coded values of my key-pair etc, feel free to remove them. Please do leave a comment if you are running into any issues. I have used RHEL image for this tutorial.
Thanks to Graham for his basic tutorial on YAML and CloudFormation, borrowed much of his code and added ansible install. I haven't used cfn-init in the below snippet. Will try to enhance the code in future and make it more sophisticated.
Please note: I have hard-coded values of my key-pair etc, feel free to remove them. Please do leave a comment if you are running into any issues. I have used RHEL image for this tutorial.
AWSTemplateFormatVersion: "2010-09-09" Description: A sample template Parameters: FilePath: Description: The path of the file. Type: String Default: /home/ec2-user/userdata Resources: MyEC2Instance: Type: "AWS::EC2::Instance" # 1 Quotes are unnecessary here - will they always be? Properties: ImageId: ami-26ebbc5c # 2 Quotes removed from the example - still works InstanceType: t2.micro KeyName: gk-sairam Tags: # 3 Here I switch to using single spaces - Key: Role # 4 Tag list item is inline Value: Test Instance - # 5 Next list item is block Key: Owner Value: GK - # 5 Next list item is block Key: name Value: gk-instance-1 BlockDeviceMappings: # 6 Switch back to double spaces - DeviceName: /dev/sdm Ebs: VolumeType: gp2 VolumeSize: 10 UserData: Fn::Base64: !Sub | # No more Fn::Join needed #!/bin/bash echo "Testing Userdata" > ${FilePath} chown ec2-user.ec2-user ${FilePath} yum -y update yum -y install vim yum -y install net-tools yum -y install wget mkdir /tmp/ansible cd /tmp/ansible wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm yum -y install epel-release-latest-7.noarch.rpm yum -y install ansible
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ReplyDeleteThe article provides a practical example of combining AWS CloudFormation with UserData to automate the installation of Ansible on a RHEL instance. The move from JSON to YAML is especially useful for infrastructure templates because the syntax is more concise and supports comments, while the example also shows how provisioning tasks can be incorporated directly into the CloudFormation workflow.
DeleteThe approach demonstrates an important infrastructure-as-code concept: a cloud environment can be defined and configured in a repeatable way instead of relying on manual server setup. A Cloud Computing Projects for Final Year can give students practical exposure to provisioning, automation, and deployment patterns such as CloudFormation and configuration management.
The note about not using cfn-init yet also makes the example useful as a starting point for improving the provisioning process. As infrastructure becomes more sophisticated, separating resource creation from instance configuration and automation can make templates easier to maintain. A Cloud Security Projects context is also relevant because automated cloud provisioning should consider secure credentials, key management, access policies, and other security controls rather than embedding sensitive values directly in templates.
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ReplyDeleteIn the excerpt that follows, I didn't use cfn-init. I'll try to improve the code and make it more complex in the future. Masters Green Jacket
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