Aaron VanSledright

Tag: lambda

  • Deleting MANY Lambda Function Versions

    I recently came across a challenge where I wanted to purge old Lambda Function versions. Some of the functions had over 65 versions! The code below will iterate through a text file with a Lambda function defined on each line. It will get a list of all the versions and delete any version that is […]

  • Moving AWS Cloudfront Logs to DynamoDB

    I think its pretty obvious that I love DynamoDB. It has become one of my favorite AWS Services and I use it almost every day at work and am getting better at using it for my personal projects as well. I had a client approach me about getting logs from a Cloudfront Distribution. Cloudfront has […]

  • Updating AWS Managed Prefix Lists

    I was working with a customer the other day trying to come up with a way to import a bunch of IP addresses into a white list on AWS. We came up with the approach of using Managed Prefix Lists in VPC. I wrote some Python in order to grab some code from an API […]

  • Automating Security Group Rule Removal

    I’m using an Amazon Web Services Security Group as a way to allow traffic into an EC2 instance for the instance’s users. The users can give themselves access through a web interface that I wrote for them. Maybe I’ll cover that in a different post. I found recently that the Security Group was nearing its […]

  • EC2 Reservation Notification

    I realized today that I haven’t updated my EC2 reservations recently. Wondering why I never did this I came to understand that there was no way that I was getting notified that the reservations were expiring. I spent the day putting together a script that would look through my reservations, assess the time of their […]

  • Pandas & NumPy with AWS Lambda

    Fun fact: Pandas and NumPy don’t work out of the box with Lambda. The libraries that you might download from your development machine probably won’t work either. The standard Lambda Python environment is very barebones by default. There is no point in loading in a bunch of libraries if they aren’t needed. This is why […]

  • Where Is It Five O’Clock Pt: 3

    So I left this project at a point where I felt it needed to be re-architected based on the fact that Flask only executes the function once and not every time the page loads. I re-architected the application in my head to include an API that calls the Lambda function and returns a list of […]

  • Where Is It 5 O’Clock Pt: 2

    So I spend the evening deploying this web application to Amazon Web Services. In my test environment, everything appeared to be working great because every time I reloaded the page it reloaded the function as well. When I transferred this over to a live environment I realized the Python function only ran every time I […]

  • EC2 Action Slack Notification

    I took a brief break from my Lambda function creation journey to go on vacation but, now i’m back! This function will notify a Slack channel of your choosing when an EC2 instance enters “Starting, Stopping, Stopped, or Shutting-Down” status. I thought this might be useful for instances that reside under a load balancer. It […]

  • Check EC2 Instance Tags on Launch

    In my ever-growing quest to automate my AWS infrastructure deployments, I realized that just checking my tags wasn’t good enough. I should force myself to put tags in otherwise my instances won’t launch at all. I find this particularly useful because I utilize AWS Backup to do automated snapshots nightly of all of my instances. […]