OSS TanbouOn this page
Overview
Kustomize is a CLI that generates final Kubernetes manifests by layering declared transformations over resource YAML without modifying the originals. Teams can keep shared configuration in a base and represent development, staging, or production differences as overlays. It fits workflows that want to preserve ordinary YAML instead of adopting template syntax.
Features and best fit
Based on official documentation; not hands-on tested · Content checked:
Key features
Apply labels, names, images, and patches without turning YAML into templates
A kustomization.yaml declares resources and transformations, and kustomize build emits the resulting YAML to standard output. The original Deployment and Service files remain usable while common labels, generated ConfigMaps, name prefixes, and patches are composed around them.
Sources: [1]
Organize shared configuration and environment differences as bases and overlays
Several overlays can reference one base and keep differences such as replica counts or resource limits separate. Teams can inspect generated output before passing it to kubectl, while kubectl apply -k provides an integrated path.
Sources: [1]
Best fit
Fits Git-reviewed environment variants that should preserve upstream manifests
It works well when upstream YAML should remain recognizable and organization-specific changes should live in a separate layer. It is an alternative to template expansion when Kubernetes-aware transformations match the configuration model.
Sources: [1]
Before adoption
Align standalone and kubectl-embedded versions and inspect output before applying it
kubectl embeds Kustomize, but that version follows the kubectl release and may not match standalone v5.8.2. Pin the executable used by CI and developers, then review and validate build output before applying it to a cluster. Configurations that use remote resources or plugins also need explicit source and execution-trust policies. The project uses Apache-2.0.
Official sources
- [1]Kustomize README at v5.8.2(2026-10-04)
- [2]Kustomize v5.8.2 release(2026-10-04)
- [3]Kustomize Apache-2.0 license at v5.8.2(2026-10-04)
Supplemental curator note
Kustomize is especially compelling when a team wants Git-reviewable differences without introducing another template language. Pin the executable used by CI and developers because standalone Kustomize and the version embedded in kubectl may differ.
Try it in 3 steps
- 1
Download the v5.8.2 Linux binary
This command targets Linux AMD64. For another OS or CPU, select the matching official release asset and confirm the reported version.
curl -L https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv5.8.2/kustomize_v5.8.2_linux_amd64.tar.gz -o /tmp/kustomize.tar.gz tar -xzf /tmp/kustomize.tar.gz ./kustomize version - 2
Create a minimal Deployment and kustomization.yaml
Register an ordinary Kubernetes YAML file as a resource.
mkdir kustomize-demo && cd kustomize-demo printf 'apiVersion: apps/v1\nkind: Deployment\nmetadata:\n name: demo\nspec:\n replicas: 1\n selector:\n matchLabels: {app: demo}\n template:\n metadata:\n labels: {app: demo}\n spec:\n containers:\n - name: demo\n image: nginx:1.27\n' > deployment.yaml ../kustomize create --resources deployment.yaml - 3
Generate the transformed YAML
Inspect the manifest with the added label on standard output before applying anything to a cluster.
../kustomize edit add label environment:demo ../kustomize build .
Growth
Growth trends · Last 30 days
12,177 Stars
Trend data is still being collected.
Development activity
Last 90 days · weekly
- Commits (last 30 days)
- 37
- Open PRs
- 59
Development activity is still being collected.
Built with
Categories and tags
GitHub data
GitHub dataView detailed GitHub data
GitHub Topics
- k8s-sig-cli
- hacktoberfest
- Stars
- 12,177
- Forks
- 2,431
- Watchers
- 108
- Open issues
- 138
- Contributors
- 405
- Owner type
- Organization
- Primary language
- Go
- License
- Apache-2.0
- Repository last updated
- Oct 3, 2026
Related information
Write a related articleShare a guide or use case for this OSS in Markdown. Articles are published after administrator approval.
Explore next
- Argo Rollouts3,592 Stars
2 shared tag(s) · 2 shared category(s) · Same language
control blue-green and canary delivery with Kubernetes CRDs, traffic shaping, metrics, promotion, and rollback
Go - Istio38,428 Stars
2 shared tag(s) · 1 shared category(s) · Same language
add mTLS, traffic policy, and telemetry transparently between services
Go - Trivy38,215 Stars
2 shared tag(s) · 1 shared category(s) · Same language
Scan images, filesystems, repositories, VMs, and Kubernetes for CVEs, secrets, IaC issues, and licenses
Go - minikube32,169 Stars
2 shared tag(s) · 1 shared category(s) · Same language
create a workstation Kubernetes cluster for pre-deployment testing
Go - Helm30,300 Stars
2 shared tag(s) · 1 shared category(s) · Same language
package Kubernetes applications as Charts and manage install, upgrade, and rollback as releases
Go - Consul30,091 Stars
2 shared tag(s) · 1 shared category(s) · Same language
combine service discovery, health checks, service mesh, and API gateway capabilities for distributed infrastructure
Go
Report incorrect information
Tell us if any listing information is incorrect or outdated.