https://ervinszilagyi.dev/articles/atom.xml Latest blog posts from ervinszilagyi.dev http://www.rssboard.org/rss-specification python-feedgen en Tue, 16 Jun 2026 08:00:47 +0000 https://ervinszilagyi.dev/articles/lessons-learned-from-building-an-mcp-client.html Takeaways from building a Java-based MCP client and CLI on top of LangChain4J. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/lessons-learned-from-building-an-mcp-client.html Fri, 25 Jul 2025 00:00:00 +0000 https://ervinszilagyi.dev/articles/building-super-slim-containerized-lambdas-revisited.html Revisiting techniques for minimizing AWS Lambda container image size, with a sustainability angle. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/building-super-slim-containerized-lambdas-revisited.html Mon, 31 Mar 2025 00:00:00 +0000 https://ervinszilagyi.dev/articles/how-to-build-a-bluesky-rss-like-bot-with-aws-lambda-and-terraform.html Building a serverless BlueSky bot that reposts RSS feed entries using AWS Lambda and Terraform. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/how-to-build-a-bluesky-rss-like-bot-with-aws-lambda-and-terraform.html Wed, 20 Nov 2024 00:00:00 +0000 https://ervinszilagyi.dev/articles/about-ai-practitioner-beta-exam.html My experience taking the AWS AI Practitioner certification during its beta phase. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/about-ai-practitioner-beta-exam.html Sun, 29 Sep 2024 00:00:00 +0000 https://ervinszilagyi.dev/articles/recertification-and-the-current-state-aws-exams.html My experience recertifying AWS Professional exams and how the exams have changed. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/recertification-and-the-current-state-aws-exams.html Wed, 14 Aug 2024 00:00:00 +0000 https://ervinszilagyi.dev/articles/terragrunt-for-multi-region-multi-account-deployments.html Why and how we adopted Terragrunt to manage Terraform across multiple AWS regions and accounts. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/terragrunt-for-multi-region-multi-account-deployments.html Wed, 08 May 2024 00:00:00 +0000 https://ervinszilagyi.dev/articles/fluentbit-with-ecs-configuration-tips-and-tricks.html Practical Fluent Bit configuration tips learned from running it with ECS in production. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/fluentbit-with-ecs-configuration-tips-and-tricks.html Tue, 26 Dec 2023 00:00:00 +0000 https://ervinszilagyi.dev/articles/why-i-am-not-able-to-remove-a-security-group.html Why Terraform sometimes cannot delete a security group attached to a VPC Lambda, and how to handle it. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/why-i-am-not-able-to-remove-a-security-group.html Sun, 10 Sep 2023 00:00:00 +0000 https://ervinszilagyi.dev/articles/expose-our-rest-api-on-aws-with-a-custom-domain.html A practical guide to exposing an AWS REST API behind a custom domain name with Route 53 and ACM. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/expose-our-rest-api-on-aws-with-a-custom-domain.html Wed, 24 May 2023 00:00:00 +0000 https://ervinszilagyi.dev/articles/an-introduction-to-aws-batch.html An overview of AWS Batch components and how to run containerized batch workloads on AWS. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/an-introduction-to-aws-batch.html Sun, 19 Mar 2023 00:00:00 +0000 https://ervinszilagyi.dev/articles/about-ocp-exams.html My experience preparing for and taking the Oracle Certified Professional Java exams. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/about-ocp-exams.html Sat, 21 Jan 2023 00:00:00 +0000 https://ervinszilagyi.dev/articles/aws-lambda-extensions-with-rust.html How to build external AWS Lambda extensions in Rust to hook into the function lifecycle. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/aws-lambda-extensions-with-rust.html Mon, 26 Dec 2022 00:00:00 +0000 https://ervinszilagyi.dev/articles/certificate-parsing-with-domain-recon.html Using domain-recon, an open-source Rust tool, to enumerate domains and subdomains via SSL certificates. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/certificate-parsing-with-domain-recon.html Sun, 06 Nov 2022 00:00:00 +0000 https://ervinszilagyi.dev/articles/containers-under-the-hood.html A deep dive into what containers really are and the Linux primitives that power them. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/containers-under-the-hood.html Sun, 16 Oct 2022 00:00:00 +0000 https://ervinszilagyi.dev/articles/electrify-your-nodejs-aws-lambdas-with-rust.html Speeding up NodeJS Lambda functions by calling Rust native addons via Neon and FFI. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/electrify-your-nodejs-aws-lambdas-with-rust.html Sun, 02 Oct 2022 00:00:00 +0000 https://ervinszilagyi.dev/articles/building-super-slim-containerized-lambdas.html Techniques to drastically reduce the size of containerized AWS Lambda images, focused on Rust. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/building-super-slim-containerized-lambdas.html Wed, 14 Sep 2022 00:00:00 +0000 https://ervinszilagyi.dev/articles/running-serverless-lambdas-with-rust-aws.html Building and deploying AWS Lambda functions written in Rust on the custom runtime. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/running-serverless-lambdas-with-rust-aws.html Mon, 05 Sep 2022 00:00:00 +0000 https://ervinszilagyi.dev/articles/gcp-associate-cloud-engineer-certification-experience.html My experience preparing for and taking the GCP Associate Cloud Engineer exam online. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/gcp-associate-cloud-engineer-certification-experience.html Tue, 09 Aug 2022 00:00:00 +0000 https://ervinszilagyi.dev/articles/deploy-containers-with-app-runner.html Deploying containerized web apps on AWS App Runner straight from GitHub or ECR. ervin_szilagh[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/deploy-containers-with-app-runner.html Sat, 28 May 2022 00:00:00 +0000 https://ervinszilagyi.dev/articles/aws-lambda-graceful-shutdown.html Implementing graceful shutdown in AWS Lambda to clean up resources like database connections. ervin_szilagyi[at]outlook.com (Ervin Szilagyi) https://ervinszilagyi.dev/articles/aws-lambda-graceful-shutdown.html Sat, 21 May 2022 00:00:00 +0000