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Optional Parameter in CloudFormation

Sometimes you want a CloudFormation Parameter to be optional. Unfortunately a blank Parameter contains an empty string. If you pass this empty string to e.g. the KeyName Property of an EC2 Instance or Launch Configuration you end up with a validation er...

Avoid Sharing Key Pairs for EC2

Lock and key devices are used by mankind for more than 6.000 years. Whether mechanical, electrical or digital, the concept stays the same: a key is needed to access resources behind a lock. Technology has made incredible progress since then. But one pro...

AWS Weekly 2016-08

The official AWS Week in Review gets longer and longer. This is a shortened version containing the most important news. Reference Security Groups in a peered VPC CloudWatch Events are Now Available in the eu-central-1 AWS CLI, AWS SDKs (JavaScript, Go,...

Protect AWS SDK calls with Bulkheads and Circuit Breakers

If you use one of the AWS SDKs to make queries to the AWS API you need to prepare for network unreliability. One of the AWS service that requires heavy SDK usage is DynamoDB (NoSQL database as a Service). I will use DynamoDB as an example in this post b...

Discovering Machine Learning with Iris flower data set

Today I want you to show how you can use the Amazon Machine Learning service to train (supervised learning) a model that can categorize data (multiclass classification). Introduction to Machine LearningGiven you have a spreadsheet with data, one column ...

Rolling Update with AWS CloudFormation

Updating all EC2 instances in an Auto Scaling Group becomes complex and expensive when done manually. If you follow the immutable infrastructure approach you will roll out a new version by creating new EC2 instances. You never change the old instances. ...

Static Website Templates for AWS CloudFormation

This page has moved to GitHub: https://github.com/widdix/aws-cf-templates/tree/master/static-website

VPC Templates for AWS CloudFormation

This page has moved to GitHub: https://github.com/widdix/aws-cf-templates/tree/master/vpc

AWS year in review

If you want to provide an excellent AWS consulting service you need to stay up-to-date with all the new AWS stuff (450 announcements in 2015). As an AWS Cloud Consultant it’s part of my job to read all AWS announcements and evaluate the new features as ...

5 AWS mistakes you should avoid

Since this year I’m working as an AWS Cloud Consultant where I see a lot of small to medium sized AWS deployments. Most of them are typical web applications. I want to share with you the 5 most common mistakes that you better avoid: managing infrastruc...