Linux

AL2023 vs. AL2: less disk space with ext4

Nov 17, 2024 · 5 min read · Linux ·

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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 utilization compared to the same workload on AL2. In this post, I'll share my investigation. AL2023 has less free disk space with …

Missing Container Disk I/O Stats with cgroup v1 on Kernel 6.1

Nov 9, 2024 · 4 min read · Linux Container ·

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As the Amazon Linux 2 (AL2) approaches its End of Life on 2025-06-30, we have started migrating our container platform from AL2 to Amazon Linux 2023 (AL2023). The migration encountered a few speed bumps. In this post, we'll look at one of them: missing container disk I/O stats. Why are container I/O dashboards blank? …

Mind ordering cycles in systemd: how systemd breaks them can brick the server start up

Oct 16, 2024 · 3 min read · Linux ·

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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 "rigourous" manual tests, and I felt confident on a Ruby Tuesday, so I launched 100 EC2 instances using the AMI. Surprise! around 28 instances failed to launch. What is going on? All …