• Jun 19, 2025 by Petri Kallberg

    Analyze This

    Those of you who have been working as network admin or someone who's work depends on network, you know when things stop working, network is always first to blame until proven innocent. To get to correct root cause it is important to quickly rule out, or find evidence of, network problems. This is where AWS Reachability Analyzer can help network admins but also let anyone to verify basic requirements for connectivity from point A to B (and back again) are in-place.
  • Dec 30, 2024 by Petri Kallberg

    VPC Dealers

    In this episode I've inherited an old web service build on common VPC design for its time. Architecture is basicly ok and fit for the purpose. Public and private resources are in their separate subnets. Only the application load balancer (ALB) is exposed to internet and EC2 instances in private subnets are protected from direct internet access. But today we can do better and with little effort, make it run better, cheaper and be more secure. Pick any 3 ;-)
  • Nov 29, 2024 by Petri Kallberg

    Access Red Hat Knowledge Base from AWS console

    At the age of genAI it is valuable to have access to expert generated content and not just trying out random advices found from internet forums full of chatbots. If you are working as linux admin, and especially when using RHEL or one of it's derivative distributions Red Hat Knowledge Base can become very helpful resource. But some of the content requires a subscription ...
  • Nov 2, 2024 by Petri Kallberg

    re:Cycle

    First +10 years of AWS service lifecycle management was just continous stream of announcements about new services and features. And many (most?) of the services that got out to public are still there with backwards compatibility all the way to the beginnings. But it isn't realistic to think one could just continue building new stuff year after year. At some point you must start end-of-life process for features and services that no longer meet customer demand, have been replaced by more efficient alternatives or have become blocker for future development.
  • Jul 31, 2024 by Petri Kallberg

    Anonymous S3 Access

    I've been hanging around at repost.aws for a while because the best way to keep your skills fresh is to see what challenges other people have in real life and check if can solve those. And maybe learn something new during the process. That is also how this post got started ...