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Sonobuoy

sonobuoy.io

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Spec score 7.3 #18 of 28 in Infrastructure Testing Tools

What it is

Sonobuoy is a free, open-source diagnostic tool for examining Kubernetes cluster state with non-destructive configuration tests. It can check a cluster against official Kubernetes specifications and produce diagnostics for troublesome workloads. Teams can build plugins for additional tests and data collection. Its default plugins run Kubernetes end-to-end tests and gather systemd logs; community options include CIS Benchmarks, Kube-hunter, Who-can, Cluster-Inventory, and Reliability Scanner. It is cluster agnostic and officially supports the latest three minor Kubernetes versions. Beginning with version 0.20, it supports Kubernetes 1.17 or later. Sonobuoy can run end-to-end tests with custom registries in air-gapped deployments. It requires an active Kubernetes cluster and an admin kubeconfig, and can be installed from binary releases or through Homebrew on macOS. The project provides community support through GitHub. Its documentation warns that default settings need explicit hardening, and notes that some logging and retrieval commands can fail on Docker Desktop Kubernetes.

Spec sheet

Purpose
Sonobuoy is a diagnostic tool for understanding Kubernetes cluster state by running configuration tests in an accessible, non-destructive way.Read 1 Oct 2026 · sonobuoy.io
Integrations
The documentation references AWS Quickstart, KinD, kubectl, Docker, and Docker Hub workflows.Read 30 Sep 2026 · sonobuoy.io
Air-gapped operation
It supports end-to-end testing with custom registries in air-gapped deployments.Read 30 Sep 2026 · sonobuoy.io
Air-gapped use
It supports end-to-end tests with custom registries in air-gapped deployments.Read 1 Oct 2026 · sonobuoy.io
Built-in plugins
The default plugins are Kubernetes end-to-end tests and systemd log gathering.Read 30 Sep 2026 · sonobuoy.io
CIS benchmarks
The CIS Benchmarks plugin uses kube-bench and runs checks on master and worker nodes.Read 1 Oct 2026 · sonobuoy.io
Cluster support
Sonobuoy runs on any Kubernetes cluster and officially supports the latest three Kubernetes minor versions.Read 1 Oct 2026 · sonobuoy.io
Community plugins
Listed plugins include CIS Benchmarks, Kube-hunter, Who-can, Cluster-Inventory, and Reliability Scanner.Read 30 Sep 2026 · sonobuoy.io
Community support
Community support is provided through the Sonobuoy GitHub project, including GitHub issues.Read 1 Oct 2026 · sonobuoy.io
Conformance testing
It tests whether a cluster conforms to official Kubernetes specifications.Read 1 Oct 2026 · sonobuoy.io
Custom testing
Users can create plugins to test custom configurations or use community plugins.Read 1 Oct 2026 · sonobuoy.io
Docker dependency
The sonobuoy images subcommand requires Docker to be installed.Read 1 Oct 2026 · sonobuoy.io
Docker Desktop limitation
The documentation reports that kubectl logs, sonobuoy logs, and sonobuoy retrieve may fail and the systemd-logs plugin may hang on Docker Desktop Kubernetes.Read 30 Sep 2026 · sonobuoy.io
End-to-end tests
The end-to-end plugin runs tests maintained by the upstream Kubernetes community.Read 1 Oct 2026 · sonobuoy.io
Host logs
The systemd-logs plugin gathers host log information by chrooting into the node filesystem and running journalctl.Read 1 Oct 2026 · sonobuoy.io
Installation
Installation is available through binary releases or Homebrew on macOS.Read 30 Sep 2026 · sonobuoy.io
Kubernetes versions
Starting with version 0.20, Sonobuoy supports Kubernetes 1.17 or later.Read 30 Sep 2026 · sonobuoy.io
Open source
Sonobuoy is released as open source software.Read 1 Oct 2026 · sonobuoy.io
Prerequisites
Running Sonobuoy requires access to an up-and-running Kubernetes cluster and an admin kubeconfig.Read 1 Oct 2026 · sonobuoy.io
RBAC reporting
The Who-can plugin reports which subjects have RBAC permissions to perform actions against cluster resources.Read 1 Oct 2026 · sonobuoy.io
Security defaults
The project states that Sonobuoy's default settings are not secure by default and require explicit hardening configuration.Read 30 Sep 2026 · github.com
Security support
Only the most recent Sonobuoy version is supported for conformance tests on the latest Kubernetes version and two prior versions.Read 30 Sep 2026 · github.com
Security visibility
The Kube-hunter plugin runs Aqua Security’s kube-hunter to increase visibility of security issues in Kubernetes environments.Read 1 Oct 2026 · sonobuoy.io
Support channel
The Sonobuoy community Slack channel has over 300 members.Read 1 Oct 2026 · sonobuoy.io
Support model
Sonobuoy is open source, provides community support through GitHub, and welcomes community contributions.Read 30 Sep 2026 · sonobuoy.io
Vulnerability reporting
Security vulnerabilities should be reported privately to the VMware Security Team, which aims to respond within three business days.Read 30 Sep 2026 · github.com
Workload debugging
It generates diagnostics for troublesome workloads that are difficult to debug.Read 1 Oct 2026 · sonobuoy.io

Strong points and limits

Strong points

  • Free and open source.
  • Tests conformance with official Kubernetes specifications.
  • Supports custom plugins and data collection.
  • Runs end-to-end tests with custom registries air-gapped.
  • Offers several built-in and community plugins.

Limits

  • Requires an active Kubernetes cluster and admin kubeconfig.
  • Default settings require explicit security hardening.
  • Some commands may fail on Docker Desktop Kubernetes.
  • Systemd-logs may hang on Docker Desktop Kubernetes.

Who it suits

Sonobuoy suits Kubernetes operators who need conformance checks, workload diagnostics, or custom cluster tests. It also fits teams running tests in air-gapped environments, provided they have an active cluster and admin kubeconfig.

Verdict

Sonobuoy covers conformance testing, workload diagnostics, and extensible checks without a listed charge. Users should account for its prerequisites, security-hardening requirement, and reported Docker Desktop limitations.

Where Specifiction places it

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