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K9s

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What K9s is

K9s is a free terminal interface for navigating, observing, and managing Kubernetes clusters and their applications. It monitors cluster changes and resource activity in real time, including metrics for pods, containers, and nodes. It works with standard Kubernetes resources and custom resource definitions. Users can view logs, scale resources, forward ports, and restart them. Pulses summarizes cluster state, while XRay shows resource dependencies; skins, columns, aliases, and hotkeys can be customized. Plugins add cluster commands using resource and cluster context variables. K9s can display RBAC rules and show what a user, group, or ServiceAccount may do. Its read-only mode disables resource modification commands. It also integrates Hey to benchmark HTTP endpoints through port forwards and services; those forwards end when the K9s session exits. K9s runs on Linux, macOS, and Windows, has no graphical interface, and is licensed under Apache License 2.0. The project prefers Kubernetes 1.28 or later and warns that older versions or insufficient RBAC permissions can cause problems.

Who it suits

K9s suits Kubernetes cluster users who are comfortable working in a terminal and want cluster monitoring and management actions in one interface. It is free, with optional sponsorship.

What it does well

  • Free under Apache License 2.0
  • Tracks resource activity and metrics in real time
  • Includes RBAC views and a read-only mode
  • Customizable skins, columns, aliases, and hotkeys

What to know first

  • No graphical interface
  • Older Kubernetes versions can cause problems
  • Insufficient RBAC permissions can cause problems

Limits

K9s prefers Kubernetes 1.28 or later, and older versions or insufficient RBAC permissions can cause problems. Its Hey benchmarking port forwards end when the K9s session exits.

Plans

PlanBilled and limitsPrice
K9sOpen-source Kubernetes terminal UI · optional sponsorshipFree

As k9scli.io lists them, read 7 Oct 2026. The maker's own page has the final word.

Getting started

  1. Visit https://k9scli.io/.
  2. Install K9s for Linux, macOS, or Windows.
  3. Use K9s from a terminal to navigate and manage Kubernetes clusters.
  4. Check that your Kubernetes version and RBAC permissions are compatible.

Verdict

K9s provides monitoring, cluster actions, and customizable views in a terminal interface. Check Kubernetes version and RBAC compatibility before using it.

Questions

Is K9s free?

Yes. The K9s plan is free, with optional sponsorship.

Is K9s open source?

Yes. It is identified under the Apache License 2.0.

Which operating systems does it support?

K9s runs on Linux, macOS, and Windows.

Does K9s have a graphical interface?

No. K9s is a terminal user interface.

Which Kubernetes versions does it work with?

K9s prefers Kubernetes 1.28 or later. Older versions or insufficient RBAC permissions can cause problems.

How can users contact or support the project?

The project invites sponsorship and community contact through its K9ers Slack.

Facts from K9s's own pages

Benchmarking
K9s integrates Hey to benchmark HTTP endpoints through port forwards and services; port forwards end when the K9s session exits. · k9scli.io, 7 Oct 2026
Compatibility limit
The repository says K9s works best with later Kubernetes versions and warns that older versions or insufficient RBAC permissions can cause problems. · github.com, 7 Oct 2026
Extensions
Users can add cluster commands through plugins, which run configured commands with resource and cluster context variables. · k9scli.io, 7 Oct 2026
Live monitoring
It watches Kubernetes for changes and tracks resource activity in real time. · k9scli.io, 7 Oct 2026
Management actions
Its cluster management commands include viewing logs, scaling, port forwarding, and restarting resources. · k9scli.io, 7 Oct 2026
Metrics
It tracks real-time metrics for resources including pods, containers, and nodes. · k9scli.io, 7 Oct 2026
Platforms
The installation page lists Linux, macOS, and Windows, with platform-specific package-manager options and release binaries. · k9scli.io, 7 Oct 2026
Purpose
K9s is a terminal UI for navigating, observing, and managing Kubernetes clusters and their applications. · k9scli.io, 7 Oct 2026
RBAC
K9s can display RBAC rules and look up what a user, group, or ServiceAccount can do on a cluster. · k9scli.io, 7 Oct 2026
Resource support
It handles standard Kubernetes resources and custom resource definitions (CRDs). · k9scli.io, 7 Oct 2026
Security and compliance
The opened maker pages identify the Apache License 2.0 but do not state security certifications or compliance attestations. · github.com, 7 Oct 2026
Security controls
K9s supports read-only mode, which disables resource modification commands. · k9scli.io, 7 Oct 2026
Support and audience
The project invites sponsorship and community contact through its K9ers Slack, and describes K9s as a tool for Kubernetes cluster users. · k9scli.io, 7 Oct 2026
Views and customization
Pulses summarizes cluster state, XRay shows resource dependencies, and users can customize skins, columns, aliases, and hotkeys. · k9scli.io, 7 Oct 2026

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