Deep-Dive

Hyperdrive (Cloudflare’s globally distributed SQL connection pooler and cache) recently added support for directing database traffic from Workers across Cloudflare Tunnels. We dive deep on what it took to add this feature.

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.

Vectorize was recently upgraded and made generally available, now supporting indexes of up to 5 million vectors, delivering faster responses, with lower pricing and a free tier. This post dives deep into how we built Vectorize to enable these improvements.

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 This will affect legacy devices with outdated trust stores (Android versions 7.1.1 or older).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 different CA

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

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

This is what Cloudflare has been able to do so far with OpenBMC with respect to our GPU-equipped servers

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.

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 multi-queue.

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 multi-queue.

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

Let's take a look from the perspective of an Oxy application developer, and then we can discuss the implementation of the framework and some of the interesting design decisions we made

We are constantly monitoring and optimizing the performance and resource utilization of our systems. Recently, we noticed that some of our TCP sessions were allocating more memory than expected. This blog post describes in detail the root cause of the problem and shows the test results of a solution

Cloudflare was originally built as native services, but we’re building more and more of it on Cloudflare itself. This post describes how and why we’re doing this.