Noureddine RAMDI / K9s: A reactive terminal UI for Kubernetes cluster management

Created Tue, 05 May 2026 22:24:55 +0000 Modified Sat, 23 May 2026 20:41:27 +0000
975 Words
github-stars kubernetes terminal-ui go cli devops k9s

derailed/k9s

Kubernetes cluster management often means juggling multiple CLI commands or switching to full graphical dashboards. K9s takes a different approach: it transforms your terminal into a continuously updated, interactive UI for navigating and managing Kubernetes resources in real-time. It’s a tool built by operators, for operators, who want speed and control without leaving the command line.

What k9s does and how it works

K9s is a terminal-based user interface for Kubernetes clusters written in Go. It uses a curses-based console UI that continuously watches your Kubernetes resources and updates the display in real-time as changes happen in the cluster. This means you get a living, reactive dashboard experience right inside your terminal, without the overhead of repeated polling or external UIs.

Under the hood, K9s connects to your Kubernetes API server using your kubeconfig context. It supports all standard Kubernetes resource types, providing dedicated views for pods, deployments, services, nodes, and more. Beyond the basics, it offers specialized views like Pulses, which gives a quick health overview of your cluster, and XRay, a dependency graph visualization of resources.

The entire interface is keyboard-driven with vim-like shortcuts, focusing on speed and efficiency for cluster operators. Features include resource editing directly in your terminal, streaming logs from pods, port forwarding, and launching benchmarks. There’s also a plugin system to extend K9s’s functionality and integration with Popeye, a popular cluster sanitization scanner.

The reactive architecture and keyboard-driven UX

The standout technical aspect of K9s is its reactive, event-driven architecture. Instead of simply polling the Kubernetes API at intervals, K9s subscribes to Kubernetes watch APIs that stream resource events. This streaming approach minimizes API overhead and latency, keeping the UI in sync with cluster state changes in near real-time.

This design turns what would normally be a static CLI tool into a dynamic dashboard that reflects your cluster’s live state. The code is organized around event handlers that update the UI components on resource changes, making the terminal interface feel responsive and alive.

The keyboard-driven navigation is another core strength. Operators can jump between resource views, filter lists, and perform actions without leaving the keyboard. This approach favors power users comfortable with keyboard shortcuts and vim-style navigation, improving efficiency compared to mouse-driven dashboards.

On the tradeoff side, the terminal UI imposes some constraints on how much information can be displayed simultaneously and the richness of visualizations. The dependency graphs and cluster health views are simplified compared to graphical dashboards but still provide valuable insights without leaving the terminal.

The plugin system adds extensibility, allowing users to add custom commands or workflows tailored to their environments. Integrating with Popeye also enhances cluster health scanning directly within K9s.

Installation and quick start

K9s supports multiple platforms including Linux, macOS, and Windows. Binaries are provided as tarballs on the release page, and it’s also installable via popular package managers:

  • Via Homebrew for macOS or Linux

    brew install derailed/k9s/k9s

  • Via MacPorts

    sudo port install k9s

  • Via snap for Linux

    snap install k9s --devmode

  • On Arch Linux

    pacman -S k9s

  • On OpenSUSE Linux distribution

    zypper install k9s

  • On FreeBSD

    pkg install k9s

  • On Ubuntu

    wget https://github.com/derailed/k9s/releases/latest/download/k9s_linux_amd64.deb && sudo apt install ./k9s_linux_amd64.deb && rm k9s_linux_amd64.deb

  • On Fedora (42+)

    dnf install k9s

  • Via Winget for Windows

    winget install k9s

  • Via Scoop for Windows

    scoop install k9s

  • Via Chocolatey for Windows

    choco install k9s

  • Via a GO install

    # NOTE: The dev version will be in effect!
go install github.com/derailed/k9s@latest

  • Via Webi for Linux and macOS

    curl -sS https://webinstall.dev/k9s | bash

  • Via pkgx for Linux and macOS

    pkgx k9s

  • Via gah for Linux and macOS

    gah install k9s

  • Via Webi for Windows

    curl.exe -A MS https://webinstall.dev/k9s | powershell

  • As a Docker Desktop Extension (for the Docker Desktop built in Kubernetes Server)

    docker extension install spurin/k9s-dd-extension:latest

You can also run K9s as a Docker container, mounting your kubeconfig for direct access:

docker run --rm -it -v $KUBECONFIG:/root/.kube/config derailed/k9s

Replace $KUBECONFIG with the default ~/.kube/config path if needed.

Who should consider using k9s

K9s is targeted at Kubernetes operators and developers who prefer working in the terminal and want a more interactive experience than raw kubectl commands. Its reactive UI and keyboard-driven navigation make it efficient for power users managing complex clusters regularly.

That said, the terminal-based interface has limitations compared to full-fledged graphical dashboards. Visual complexity and multi-pane views are constrained by terminal size and curses capabilities. If you rely heavily on mouse-driven interaction or require highly detailed visualizations, a GUI tool might be better suited.

For users comfortable with keyboard shortcuts and looking to speed up cluster navigation, resource management, and troubleshooting without leaving the CLI, K9s is a solid choice. The plugin system and integration with tools like Popeye add useful extensibility.

Overall, K9s strikes a pragmatic balance by turning Kubernetes resource watching and management into a live, low-latency terminal experience. It’s well worth exploring if you spend time in terminals and want to cut down on context switching to external UIs.

→ GitHub Repo: derailed/k9s ⭐ 33,559 · Go