2025-10-16
There's no way to audit a site’s client-side code as it changes, making it hard to trust sites that use cryptography. We preview a specification we co-authored that adds auditability to the web....
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2025-10-08
84 million requests a second means even rare bugs appear often. We'll reveal how we discovered a race condition in the Go arm64 compiler and got it fixed....
2025-09-26
We’ve replaced the original core system in Cloudflare with a new modular Rust-based proxy, replacing NGINX. ...
2025-09-25
R2 SQL provides a built-in, serverless way to run ad-hoc analytic queries against your R2 Data Catalog. This post dives deep under the Iceberg into how we built this distributed engine....
2025-04-10
D1, Cloudflare’s managed SQL database, announces read replication beta. Here's a deep dive of the read replication implementation and how your queries can remain consistent across all regions....
April 08, 2025 2:00 PM
Hyperdrive, Cloudflare's global connection pooler, relies on some key innovations to make your database connections work. Let's dive deeper, in celebration of its availability for Free Plan customers....
April 02, 2025 1:00 PM
Yarn tests fail consistently at the 27-second mark. The usual suspects are swiftly eliminated. A deep dive is taken to comb through traces, only to be derailed into an unexpected crash investigation....
February 14, 2025 2:00 PM
The Linux kernel can produce a hung task warning. Searching the Internet and the kernel docs, you can find a brief explanation that the process is stuck in the uninterruptible state....
January 27, 2025 2:00 PM
Here we explain how we made our data pipeline scale to 700 million events per second while becoming more resilient than ever before. We share some math behind our approach and some of the designs of ...
January 03, 2025 2:00 PM
Multi-Path TCP (MPTCP) leverages multiple network interfaces, like Wi-Fi and cellular, to provide seamless mobility for more reliable connectivity. While promising, MPTCP is still in its early stages,...
October 25, 2024 1:00 PM
Hyperdrive (Cloudflare’s globally distributed SQL connection pooler and cache) recently added support for directing database traffic from Workers across Cloudflare Tunnels....
October 23, 2024 1:00 PM
In this post we will describe how we use anomaly detection to watch for novel DDoS attacks. We’ll provide an overview of how we build models which flag unusual traffic and keep our customers safe....
October 22, 2024 1:00 PM
Cloudflare's Vectorize is now generally available, offering faster responses, lower pricing, a free tier, and supporting up to 5 million vectors....
April 12, 2024 1:00 PM
Let’s Encrypt’s cross-signed chain will be expiring in September. This will affect legacy devices with outdated trust stores (Android versions 7.1.1 or older). To prevent this change from impacting customers, Cloudflare will shift Let’s Encrypt certificates upon renewal to use a ...
March 06, 2024 2:00 PM
This post illustrates some of the Linux Kernel features, which are helping us to keep our production systems more secure. We will deep dive into how they work and why you may consider enabling them as well...
February 08, 2024 2:00 PM
This is our story of what we learned about the connect() implementation for TCP in Linux. Both its strong and weak points. How connect() latency changes under pressure, and how to open connection so that the syscall latency is deterministic and time-bound...
December 06, 2023 2:00 PM
This is what Cloudflare has been able to do so far with OpenBMC with respect to our GPU-equipped servers...
November 17, 2023 2:00 PM
The initial posts are dedicated to the x86 architecture. Since then, the fleet of our working machines has expanded to include a large and growing number of ARM CPUs. This time we’ll repeat this exercise for the aarch64 architecture....
October 06, 2023 1:05 PM
Tap devices were historically used for VPN clients. Using them for virtual machines is essentially reversing their original purpose - from traffic sinks to traffic sources. In the article I explore the intricacies of tap devices, covering topics like offloads, segmentation, and m...
June 26, 2023 1:00 PM
In this post, we'll provide some insight into the process of investigating networking issues and how to begin debugging issues in the kernel using pwru and kprobe tracepoints...
