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CloudFormation parameters grouping and labelling

By pprakash · December 6, 2015 · AWS, CFN, Cloud, CloudFormation, Tech · Leave a comment

Last week AWS enhanced CloudFormation by adding new services like AWS CodePipeline, AWS Config, AWS KMS and few more; default stack limit also has been increased from 20 to 200. Among other new features they also have introduced this small but useful parameters grouping and labelling feature. Earlier all the parameters in a CFN template […]

Executing Ruby code in AWS Lambda

By pprakash · November 29, 2015 · AWS, Chef, Lambda, Python, Ruby, Tech · 10 Comments

AWS Lambda supports only Java, JavaScript & Python at the time of writing this post. I was wondering whether I can exploit the Lambda to execute chef’s knife commands on it since Lambda runs on a Linux container. Using simple python function I have identified that the code of the Lambda function gets copied to […]

Automated cross account DNS management through CFN and API access through API gateway

By pprakash · November 27, 2015 · API Gateway, AWS, CFN, CloudFormation, Lambda, NodeJS, Tech · Leave a comment

It’s a general best practice to manage all DNS entries in Route53 in a centralized AWS account. In that case it is difficult to automate the DNS record creation/deletion based on resources created in another AWS account using CloudFormation. CloudFormation doesn’t yet have the capability to create resources in a different AWS account. Combining IAM […]

Obtain AMI Id from name to be used in CFN

By pprakash · November 22, 2015 · AWS, CFN, CloudFormation, Lambda, NodeJS, Tech · Leave a comment

In most cases we create custom AMI’s for various reasons like OS hardening, installing and configuring additional software, etc. If you use single AWS account to create the AMI’s and share it with other AWS accounts and use that as part of CloudFormation template, it is required to pass the new AMI Id every time. […]

Save AWS costs by scheduled start and stop of EC2 instances

By pprakash · November 15, 2015 · AWS, Lambda, Python, Tech · Leave a comment

Most of the AWS resources are billed on per-hour basis which provides us an opportunity to save cost based on the usage pattern. Especially in case of Dev/Test environment, we need them only during the working days and working hours. By using AWS Lambda function (python) in combination with EC2 instance tags, scheduled start or […]