Deploy your Next.js app to Cloudflare Workers with the Cloudflare adapter for OpenNext

We first announced the Cloudflare adapter for OpenNext at Builder Day 2024. It transforms Next.js applications to enable them to run on Cloudflare’s infrastructure.

Over the seven months since that September announcement, we have been working hard to improve the adapter. It is now more tightly integrated with OpenNext to enable supporting many more Next.js features. We kept improving the Node.js compatibility of Workers and unenv was also improved to polyfill the Node.js features not yet implemented by the runtime.

With all of this work, we are proud to announce the 1.0.0-beta release of @opennextjs/cloudflare. Using the Cloudflare adapter is now the preferred way to deploy Next applications to the Cloudflare platform, instead of Next on Pages.

Read on to learn what is possible today, and about our plans for the coming months.

OpenNext

OpenNext is a build tool designed to transform Next.js applications into packages optimized for deployment across various platforms. Initially created for serverless environments on AWS Lambda, OpenNext has expanded its capabilities to support a wider range of environments, including Cloudflare Workers and traditional Node.js servers.

By integrating with the OpenNext codebase, the Cloudflare adapter is now able to Continue reading

Pools across the sea: how Hyperdrive speeds up access to databases and why we’re making it free

Free as in beer

In acknowledgement of its pivotal role in building distributed applications that rely on regional databases, we’re making Hyperdrive available on the free plan of Cloudflare Workers!

Hyperdrive enables you to build performant, global apps on Workers with your existing SQL databases. Tell it your database connection string, bring your existing drivers, and Hyperdrive will make connecting to your database faster. No major refactors or convoluted configuration required.

Over the past year, Hyperdrive has become a key service for teams that want to build their applications on Workers and connect to SQL databases. This includes our own engineering teams, with Hyperdrive serving as the tool of choice to connect from Workers to our own Postgres clusters for many of the control-plane actions of our billing, D1, R2, and Workers KV teams (just to name a few). 

This has highlighted for us that Hyperdrive is a fundamental building block, and it solves a common class of problems for which there isn’t a great alternative. We want to make it possible for everyone building on Workers to connect to their database of choice with the best performance possible, using the drivers and frameworks they already know Continue reading

Build global MySQL apps using Cloudflare Workers and Hyperdrive

Today, we’re announcing support for MySQL in Cloudflare Workers and Hyperdrive. You can now build applications on Workers that connect to your MySQL databases directly, no matter where they’re hosted, with native MySQL drivers, and with optimal performance. 

Connecting to MySQL databases from Workers has been an area we’ve been focusing on for quite some time. We want you to build your apps on Workers with your existing data, even if that data exists in a SQL database in us-east-1. But connecting to traditional SQL databases from Workers has been challenging: it requires making stateful connections to regional databases with drivers that haven’t been designed for the Workers runtime. 

After multiple attempts at solving this problem for Postgres, Hyperdrive emerged as our solution that provides the best of both worlds: it supports existing database drivers and libraries while also providing best-in-class performance. And it’s such a critical part of connecting to databases from Workers that we’re making it free (check out the Hyperdrive free tier announcement).

With new Node.js compatibility improvements and Hyperdrive support for the MySQL wire protocol, we’re happy to say MySQL support for Cloudflare Workers has been achieved. If you want to Continue reading

“Just use Vite”… with the Workers runtime

Today, we are announcing the 1.0 release of the Cloudflare Vite plugin, as well as official support for React Router v7!

Over the past few years, Vite’s meteoric rise has seen it become one of the most popular build tools for web development, with a large ecosystem and vibrant community. The Cloudflare Vite plugin brings the Workers runtime right into its beating heart! Previously, the Vite dev server would always run your server code in Node.js, even if you were deploying to Cloudflare Workers. By using the new Environment API, released experimentally in Vite 6, your Worker code can now run inside the native Cloudflare Workers runtime (workerd). This means that the dev server matches the production behavior as closely as possible, and provides confidence as you develop and deploy your applications.

Vite 6 includes the most significant changes to Vite’s architecture since its inception and unlocks many new possibilities for the ecosystem. Fundamental to this is the Environment API, which enables the Vite dev server to interact with any number of custom runtime environments. This means that it is now possible to run server code in alternative JavaScript runtimes, such as our Continue reading

Skip the setup: deploy a Workers application in seconds

You can now add a Deploy to Cloudflare button to the README of your Git repository containing a Workers application — making it simple for other developers to quickly set up and deploy your project! 

The Deploy to Cloudflare button: 

  1. Creates a new Git repository on your GitHub/ GitLab account: Cloudflare will automatically clone and create a new repository on your account, so you can continue developing. 

  2. Automatically provisions resources the app needs: If your repository requires Cloudflare primitives like a Workers KV namespace, a D1 database, or an R2 bucket, Cloudflare will automatically provision them on your account and bind them to your Worker upon deployment. 

  3. Configures Workers Builds (CI/CD): Every new push to your production branch on your newly created repository will automatically build and deploy courtesy of Workers Builds. 

  4. Adds preview URLs to each pull request: If you’d like to test your changes before deploying, you can push changes to a non-production branch and preview URLs will be generated and posted back to GitHub as a comment.   

There is nothing more frustrating than struggling to kick the tires on a new project because you don’t know where to start. Continue reading

iBGP Local-AS Details

Did you know you could use the neighbor local-as BGP functionality to fake an iBGP session between different autonomous systems? I knew Cisco IOS supported that monstrosity for ages (supposedly “to merge two ISPs that have different AS numbers”) and added the appropriate tweaks1 into netlab when I added the BGP local-as support in release 1.3.1. Someone couldn’t resist pushing us down that slippery slope, and we ended with IBGP local-as implemented on 18 platforms (almost a dozen network operating systems).

I even wrote a related integration test, and all our implementations passed it until I asked myself a simple question: “But does it work?” and the number of correct implementations that passed the test without warnings dropped to zero.

Read more …

NB521: Optics Advances in the Data Center; Google Extends Gmail’s End-to-End Encryption

Take a Network Break! We check in on a serious Firefox vulnerability, explore NIST’s latest post-quantum encryption algorithm, and discuss a broken auto-update functionality in VMware Workstation. NetBox adds config drift detection to its network automation software, the startup Lightmatter tackles co-packaged optics, and Corning launches Glassworks AI in a bid to replace copper cabling... Read more »

Piecing together the Agent puzzle: MCP, authentication & authorization, and Durable Objects free tier

It’s not a secret that at Cloudflare we are bullish on the future of agents. We’re excited about a future where AI can not only co-pilot alongside us, but where we can actually start to delegate entire tasks to AI. 

While it hasn’t been too long since we first announced our Agents SDK to make it easier for developers to build agents, building towards an agentic future requires continuous delivery towards this goal. Today, we’re making several announcements to help accelerate agentic development, including:

  • New Agents SDK capabilities: Build remote MCP clients, with transport and authentication built-in, to allow AI agents to connect to external services. 

  • BYO Auth provider for MCP: Integrations with Stytch, Auth0, and WorkOS to add authentication and authorization to your remote MCP server. 

  • Hibernation for McpAgent: Automatically sleep stateful, remote MCP servers when inactive and wake them when needed. This allows you to maintain connections for long-running sessions while ensuring you’re not paying for idle time. 

  • Durable Objects free tier: We view Durable Objects as a key component for building agents, and if you’re using our Agents SDK, you need access to it. Until today, Durable Objects Continue reading

Cloudflare acquires Outerbase to expand database and agent developer experience capabilities

I’m thrilled to share that Cloudflare has acquired Outerbase. This is such an amazing opportunity for us, and I want to explain how we got here, what we’ve built so far, and why we are so excited about becoming part of the Cloudflare team.

Databases are key to building almost any production application: you need to persist state for your users (or agents), be able to query it from a number of different clients, and you want it to be fast. But databases aren’t always easy to use: designing a good schema, writing performant queries, creating indexes, and optimizing your access patterns tends to require a lot of experience. Add that to exposing your data through easy-to-grok APIs that make the ‘right’ way to do things obvious, a great developer experience (from dashboard to CLI), and well… there’s a lot of work involved.

The Outerbase team is already getting to work on some big changes to how databases (and your data) are viewed, edited, and visualized from within Workers, and we’re excited to give you a few sneak peeks into what we’ll be landing as we get to work.

Database DX

When we first started Outerbase, we saw how Continue reading

Cloudflare Workflows is now GA: production-ready durable execution

Betas are useful for feedback and iteration, but at the end of the day, not everyone is willing to be a guinea pig or can tolerate the occasional sharp edge that comes along with beta software. Sometimes you need that big, shiny “Generally Available” label (or blog post), and now it’s Workflows’ turn.

Workflows, our serverless durable execution engine that allows you to build long-running, multi-step applications (some call them “step functions”) on Workers, is now GA.

In short, that means it’s production ready —  but it also doesn’t mean Workflows is going to ossify. We’re continuing to scale Workflows (including more concurrent instances), bring new capabilities (like the new waitForEvent API), and make it easier to build AI agents with our Agents SDK and Workflows.

If you prefer code to prose, you can quickly install the Workflows starter project and start exploring the code and the API with a single command:

npm create cloudflare@latest workflows-starter -- 
--template="cloudflare/workflows-starter"

How does Workflows work? What can I build with it? How do I think about building AI agents with Workflows and the Agents SDK? Well, read on.

Building with Workflows

Workflows is a durable execution engine built on Cloudflare Workers that Continue reading

Introducing AutoRAG: fully managed Retrieval-Augmented Generation on Cloudflare

Today we’re excited to announce AutoRAG in open beta, a fully managed Retrieval-Augmented Generation (RAG) pipeline powered by Cloudflare, designed to simplify how developers integrate context-aware AI into their applications. RAG is a method that improves the accuracy of AI responses by retrieving information from your own data, and providing it to the large language model (LLM) to generate more grounded responses.

Building a RAG pipeline is a patchwork of moving parts. You have to stitch together multiple tools and services — your data storage, a vector database, an embedding model, LLMs, and custom indexing, retrieval, and generation logic — all just to get started. Maintaining it is even harder. As your data changes, you have to manually reindex and regenerate embeddings to keep the system relevant and performant. What should be a simple “ask a question, get a smart answer” experience becomes a brittle pipeline of glue code, fragile integrations, and constant upkeep.

AutoRAG removes that complexity. With just a few clicks, it delivers a fully-managed RAG pipeline end-to-end: from ingesting your data and automatically chunking and embedding it, to storing vectors in Cloudflare’s Vectorize database, performing semantic retrieval, and generating high-quality responses using Workers AI. AutoRAG continuously monitors Continue reading

Welcome to Developer Week 2025

We’re kicking off Cloudflare’s 2025 Developer Week — our innovation week dedicated to announcements for developers.

It’s an exciting time to be a developer. In fact, as a developer, the past two years might have felt a bit like every week is Developer Week. Starting with the release of ChatGPT, it has felt like each day has brought a new, disruptive announcement, whether it’s new models, hardware, agents, or other tools. From late 2024 and in just the first few months of 2025, we’ve seen the DeepSeek model challenge assumptions about what it takes to train a new state-of-the-art model, MCP introduce a new standard for how LLMs interface with the world, and OpenAI’s o4 model Ghiblify the world.

And while it’s exciting to witness a technological revolution unfold in front of your eyes, it’s even more exciting to partake in it. 

A new era of innovation

One of the marvels of the recent AI revolution is the extent to which the cost of experimentation has gone down. Ideas that would have taken whole weekends, weeks, or months to build can now be turned into working code in a day. You can vibe-code your way through things you might Continue reading

AI for Network Engneers: Challenges in AI Fabric Design

 Introduction


Figure 10-1 illustrates a simple distributed GPU cluster consisting of three GPU hosts. Each host has two GPUs and a Network Interface Card (NIC) with two interfaces. Intra-host GPU communication uses high-speed NVLink interfaces, while inter-host communication takes place via NICs over slower PCIe buses.

GPU-0 on each host is connected to Rail Switch A through interface E1. GPU-1 uses interface E2 and connects to Rail Switch B. In this setup, inter-host communication between GPUs connected to the same rail passes through a single switch. However, communication between GPUs on different rails goes over three hops  Rail–Spine–Rail switches.

In Figure 10-1, we use a data parallelization strategy where a training dataset is split into six micro-batches, which are distributed across the GPUs. All GPUs use the shared feedforward neural network model and compute local model outputs. Next, each GPU calculates the model error and begins the backward pass to compute neuron-based gradients. These gradients indicate how much, and in which direction, the weight parameters should be adjusted to improve the training result (see Chapter 2 for details).

Figure 10-1: Rail-Optimized Topology.


Egress Interface Congestions


After computing all gradients, each GPU stores the results in a local memory buffer and Continue reading

Meta’s Llama 4 is now available on Workers AI

As one of Meta’s launch partners, we are excited to make Meta’s latest and most powerful model, Llama 4, available on the Cloudflare Workers AI platform starting today. Check out the Workers AI Developer Docs to begin using Llama 4 now.

What’s new in Llama 4?

Llama 4 is an industry-leading release that pushes forward the frontiers of open-source generative Artificial Intelligence (AI) models. Llama 4 relies on a novel design that combines a Mixture of Experts architecture with an early-fusion backbone that allows it to be natively multimodal.

The Llama 4 “herd” is made up of two models: Llama 4 Scout (109B total parameters, 17B active parameters) with 16 experts, and Llama 4 Maverick (400B total parameters, 17B active parameters) with 128 experts. The Llama Scout model is available on Workers AI today.

Llama 4 Scout has a context window of up to 10 million (10,000,000) tokens, which makes it one of the first open-source models to support a window of that size. A larger context window makes it possible to hold longer conversations, deliver more personalized responses, and support better Retrieval Augmented Generation (RAG). For example, users can take advantage of that increase to summarize multiple documents or Continue reading

io_uring, kTLS and Rust for zero syscall HTTPS server

Around the turn of the century we started to get a bigger need for high capacity web servers. For example there was the C10k problem paper.

At the time, the kinds of things done to reduce work done per request was pre-forking the web server. This means a request could be handled without an expensive process creation.

Because yes, creating a new process for every request was something perfectly normal.

Things did get better. People learned how to create threads, making things more light weight. Then they switched to using poll()/select(), in order to not just spare the process/thread creation, but the whole context switch.

I remember a comment on Kuro5hin from anakata, the creator of both The Pirate Bay and the webserver that powered it, along the lines of “I am select() of borg, resistance is futile”, mocking someone for not understanding how to write a scalable webserver.

But select()/poll() also doesn’t scale. If you have ten thousand connections, that’s an array of ten thousand integers that need to be sent to the kernel for every single iteration of your request handling loop.

Enter epoll (kqueue on other operating systems, but I’m focusing Continue reading

From Python to Go 018. Interaction With Network Devices Using GNMI.

Hello my friend,

Within past blog posts we covered how to interact with network devices (in fact, many servers support that as well) using SSH/CLI and NETCONF/YANG. Those two protocols allow you to confidently cover almost all cases for managing devices, whether you prefer more human-like approach, that is templating CLI commands and pushing them via SSH or using structured XML data and send it via NETCONF. However, there are more protocols and today we are going to talk about the most modern to the date, which is called GNMI (generalized network management interface).

How Does Automation Help Real Business?

Talking to students at our trainings and with customers and peers at various events, there is often a concern arise that small and medium businesses don’t have time and/or need to invest in automation. There is no time as engineers are busy solving “real” problems, like outages, customer experience degradation, etc. There is no need because why to bother, we have engineers to tackle issue. From my experience automation allows to save so much time on doing operational tasks and to free it up for improving user experience and developing new problems, that is difficult to overestimate. It really is Continue reading

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