kubernetes

This category contains 7 posts

Testing CloudNativePG Preferred Data Durability

Posted byJeremy⋅October 5, 2025⋅Leave a comment

This is the third post about running Jepsen against CloudNativePG. Earlier posts: First: shout out to whoever first came up with Oracle Data Guard Protection Modes. Designing it to be explained as a choice between performance, availability and protection was a great idea. Yesterday’s blog post described how the core of all data safety is copies of …Continue reading→

Data Safety on a Budget

Posted byJeremy⋅October 4, 2025⋅Leave a comment

Many experienced DBAs joke that you can boil down the entire job to a single rule of thumb: Don’t lose your data. It’s simple, memorable, and absolutely true – albeit a little oversimplified. Mark Porter’s Cultural Hint “The Onion of our Requirements” conveys the same idea with a lot more accuracy: We need to always make sure we …Continue reading→

Losing Data is Harder Than I Expected

Posted byJeremy⋅September 28, 2025⋅1 Comment

This is a follow‑up to the last article: Run Jepsen against CloudNativePG to see sync replication prevent data loss. In that post, we set up a Jepsen lab to make data loss visible when synchronous replication was disabled — and to show that enabling synchronous replication prevents it under crash‑induced failovers. Since then, I’ve been …Continue reading→

Run Jepsen against CloudNativePG to see sync replication prevent data loss

Posted byJeremy⋅September 1, 2025⋅1 Comment

Are you in the Pacific Northwest? Want to learn more about topics related to this blog? At 3:15p on Thu Nov 13 in KubeCon Atlanta, I’ll be speaking with Leonardo Cecchi about distributed systems theory applied to standard open source postgres cluster reconfigurations. Jepsen is a testing framework for distributed systems that verifies safety guarantees …Continue reading→

Graviton2 versus Graviton4

Posted byJeremy⋅August 3, 2025⋅2 Comments

Just a short post, because I thought this was pretty remarkable. Below, I have screenshots showing the CPU utilization of two AWS instances in us-west-2 which are running an identical workload. They are running the CloudNativePG playground, which is a production-like learning and testing environment (all running virtually inside the single ec2 instance, which can …Continue reading→

Waiting for Postgres 18 – Docker Containers 34% Smaller

Posted byJeremy⋅April 7, 2025⋅Leave a comment

On February 25, 2025 Christoph Berg committed the patch: This closed Debian bug 927182 which had been opened in April 2019 by Laurence Parry. That bug had raised concerns over the significant size increase of adding LLVM as a requirement to support Postgres JIT functionality. Postgres supports packaging LLVM as a separate optional package without …Continue reading→

Testing loadBalancerSourceRanges with CloudNativePG on Azure Kubernetes

Posted byJeremy⋅March 14, 2025⋅Leave a comment

This option didn’t seem super widely documented from my initial searches online; it should be able to basically enforce layer 4 ingress/firewall rules at the individual service level. This is a quick test to check if it works. Steps were generated with ChatGPT, and mostly worked. It missed Azure provider registration, but I figure that …Continue reading→

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This is my personal website. The views expressed here are mine alone and may not reflect the views of my employer.I am currently looking for consulting and/or contracting work in the USA around the oracle database ecosystem.

contact:312-725-9249 orschneider @ ardentperf.com