This week, I needed to install the Amazon SSM Agent and was surprised to find that GPG (GNU Privacy Guard) was the only way to verify the download. I had assumed that software downloads verification had largely transitioned to PKI (Public Key Infrastructure). This short post is a refresh on GPG. OpenPGP is an open …

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While debugging memory bloat in a Go application recently, I found that removing the GOMEMLIMIT soft memory limit and disabling transparent huge pages partially mitigated the issue. However, I couldn't fully explain why these changes worked. So I thought why not ask the internet about it. A simplified memory bloat …

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We started migrating from Amazon Linux 2 (AL2) to Amazon Linux 2023 (AL2023) a month ago. While testing workloads on AL2023 in the pre-production environment, I noticed slightly higher disk usage compared to the same workload on AL2. In this post, I'll share my investigation. AL2023 has less free disk space with ext4, …

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As Amazon Linux 2 (AL2) approaches its End of Life on June 30, 2025, we have started migrating our container platform from AL2 to Bottlerocket. The migration encountered a few speed bumps. In this post, we'll examine one of them: missing container disk I/O stats. Why are container I/O dashboards blank? Since …

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I've been building a service for a month, and the day finally arrived when I had the artifact - an EC2 AMI. The AMI passed my "rigorous" manual tests so I launched 100 EC2 instances. Surprise! Around 28 instances failed to launch. What's going on? All failed instances were stuck in the …

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