The MetalBear Blog
Deep dives, how-tos, and field notes on Kubernetes development and AI-driven software engineering. From the MetalBear team, the company behind mirrord.
AI coding agents push code every few minutes, but most teams are still running the same CI pipelines designed for human-paced development. ā¦
Kubernetes 1.36 'Haru' graduates Mutating Admission Policies and User Namespaces to stable, expands DRA with fallback scheduling and device ā¦
AI wrote the code, the unit tests passed, and CI failed two hours later. Here's why that keeps happening and how to fix it.
Developing server-side rendered frontends locally is painful ā your code can't reach cluster-internal services, and local setups never match ā¦
TDD for the age of AI.
Our recap of KubeCon + CloudNativeCon Europe 2026 in Amsterdam, covering the themes that dominated, what surprised us, and why this was a ā¦
AI tools generate code faster than ever, but testing that code against real infrastructure is still a hard problem. Here's how mirrord ā¦
Everything you need to know before hitting the ground at KubeCon + CloudNativeCon Europe 2026, from the sessions we're excited about to the ā¦
AI has made writing code faster than ever, but verification hasn't kept pace. Testing is now the bottleneck and here's how to fix it.
Run your changes as an isolated preview inside your staging cluster, share with stakeholders, and get feedback before you deployāwithout ā¦
Developer tools always come with a cost. Here's how to measure whether they're actually worth it.
MetalBear had a booth and a talk at the first London edition of ContainerDays. Here is what stood out.
Kubernetes handles scheduling and isolation well, but LLMs introduce new security risks. Here's how to build controls for prompt injection, ā¦
Kubernetes has become the de-facto platform for running containerized applications at scale. This beginner's guide covers the fundamentals ā¦
With dozens of cloud native conferences happening every year, it's hard to know which ones are worth your time. Here are five conferences in ā¦
mirrord for CI enables you to run concurrent CI tests on a shared, production-like Kubernetes environment, providing fast feedback through ā¦
AI tools are everywhere right now, and our engineering team uses them daily. In this post, we're sharing how we actually use AI coding tools ā¦
Based on insights from KubeCon and conversations with CNCF Ambassadors and project maintainers, here are our top 5 predictions on where ā¦
Kubernetes 1.35 is a release about reinforcing the roots of the platform: tightening security boundaries, clarifying node capabilities, ā¦
The MetalBear team was at KubeCon + CloudNativeCon Atlanta, and we're sharing the trends we heard on repeat, what we saw on the floor, and a ā¦
Your first 30 days as a DevEx engineer are crucial. Use this three-phase audit to identify the real bottlenecks and set yourself up for ā¦
Test database migrations and schema changes safely in isolation with mirrord's new DB Branching feature.
Discover some exciting talks at KubeCon Atlanta 2025 that you wonāt want to miss, featuring AI-powered infrastructure, large-scale ā¦
Building a UI from scratch without designers or frontend engineers? We tried Lovable to create an onboarding wizard for mirrord and share ā¦
A firsthand account of how Claude solved a complex bug by not just writing code, but by inventing its own debugging tools.
We're excited to share that MetalBear has been recognized as a Cool Vendor in Gartner's Cool Vendors 2025 Report in the Container Management ā¦
Learn how to skip the tedious deploy-and-wait cycle when adding OpenTelemetry instrumentation with mirrord.
We raised $12.5m to fix everything that's broken in cloud software development.
LLMs have made code generation very easy and now integration testing remains the biggest bottleneck. Discover how mirrord enables AI agents ā¦
Learn about the new features in Kubernetes 1.34, including Dynamic Resource Allocation, improved security controls, and enhanced DNS support ā¦
Sometimes our blog posts about mirrord hit a nerve. Here's us responding to the mean comments on one such recent post.
Our experience evaluating documentation platforms for mirrord and what we learned along the way.
The mirrord extension for Cursor and Windsurf lets you test AI-generated code in realistic Kubernetes environments without deployments or CI ā¦
KubeCon can be overwhelming with so many sessions. Here are 5 talks we're excited about and why you might want to add them to your schedule ā¦
Combining Dapr and mirrord makes developing cloud-native applications simpler and greatly improves your developer experience.
Learn why deploying to staging is not always necessary and how remocal testing can speed up feedback loops without sacrificing test ā¦
mirrord dump lets you inspect incoming TCP traffic to a Kubernetes resource, helping you troubleshoot and understand your application ā¦
Cloud-native development is messy, but your workflow doesnāt have to be. This guide shows how to connect local code to your Kubernetes ā¦
If youāre struggling to test early, youāre not alone. This article explains why shift-left often breaks in practice and shows how better ā¦
Stop redeploying to debug. Start shipping with production-level confidence using these six DevX accelerators.
For cloud-native applications, moving code from a developerās local machine to a staging or testing environment is rarely straightforward. ā¦
Kubernetes 1.33, the āOctarineā release, introduces powerful new features that improve Kubernetes networking, workload identity, storage, ā¦
A summary of our experience from KubeCon Europe 2025 in London
Schedule recommendations for KubeCon North America 2024
If youāre looking to speed things up and ship more, come see us at Booth #R51 - and weāll get you sorted.
Understanding and using the mirrord port-forward command to redirect traffic.
Introducing SQS splitting in mirrord for Teams.
Some of our favorite Platform Engineering content from recent weeks.
On the advantages of using OSS MVPs in continuously validating your new product offerings.
mirrord for Teams is officially launched! Read on to learn more about what it adds on top of the mirrord OSS, and how it can help your ā¦
A summary of our collective impressions and insights from KubeCon Europe 2024
A comprehensive comparison of Internal Developer Platform vendors and tools.
How we implemented the container pause feature, and why we decided to deprecate it
The MetalBear team will be joining the fun in Paris this year, and weāve prepared a list of five talks that weāre particularly excited ā¦
Using mirrord to close the gap between Dev & Prod
Introducing the new outgoing traffic filter feature for mirrord
A comparison between mirrord and Telepresence
Introducing the new targetless mode for mirrord
Get up and running with Kubernetes operators in (hopefully) minutes!
How we dealt with macOS's SIP mechanism to load mirrord into protected binaries
Where we discuss the ways modern devtool companies are trying to make life easier for cloud developers.
Our biggest release yet is now available for download
How did we hook Go functions from Rust to work with mirrord? A quick dive into the Go Runtime and switching from the Go stack to the system ā¦
Launching a new Discord community for backend developers to hang, discuss and learn from.
Getting started with Ephemeral Containers, and a short case study on how we used them with mirrord
mirrord internals - hooking libc functions and fixing bugs
Why we chose to use Rust at MetalBear
The War on the Long Dev Loop
MetalBear::start()
Ship Faster, Ship Better
With mirrord, cloud developers can run local code like it's in their Kubernetes cluster — streamlining coding, debugging, testing, and troubleshooting.