kustomize

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Version: v3.3.1 Latest Latest
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Published: Oct 8, 2019 License: Apache-2.0

README

kustomize

kustomize lets you customize raw, template-free YAML files for multiple purposes, leaving the original YAML untouched and usable as is.

kustomize targets kubernetes; it understands and can patch kubernetes style API objects. It's like make, in that what it does is declared in a file, and it's like sed, in that it emits edited text.

This tool is sponsored by sig-cli (KEP), and inspired by DAM.

Build Status Go Report Card

Download a binary from the release page, or see these instructions.

Browse the docs or jump right into the tested examples.

kubectl integration

Since v1.14 the kustomize build system has been included in kubectl.

kubectl version kustomize version
v1.16.0 v2.0.3
v1.15.x v2.0.3
v1.14.x v2.0.3

For examples and guides for using the kubectl integration please see the kubectl book or the kubernetes documentation.

Usage

1) Make a kustomization file

In some directory containing your YAML resource files (deployments, services, configmaps, etc.), create a kustomization file.

This file should declare those resources, and any customization to apply to them, e.g. add a common label.

base image

File structure:

~/someApp
├── deployment.yaml
├── kustomization.yaml
└── service.yaml

The resources in this directory could be a fork of someone else's configuration. If so, you can easily rebase from the source material to capture improvements, because you don't modify the resources directly.

Generate customized YAML with:

kustomize build ~/someApp

The YAML can be directly applied to a cluster:

kustomize build ~/someApp | kubectl apply -f -
2) Create variants using overlays

Manage traditional variants of a configuration - like development, staging and production - using overlays that modify a common base.

overlay image

File structure:

~/someApp
├── base
│   ├── deployment.yaml
│   ├── kustomization.yaml
│   └── service.yaml
└── overlays
    ├── development
    │   ├── cpu_count.yaml
    │   ├── kustomization.yaml
    │   └── replica_count.yaml
    └── production
        ├── cpu_count.yaml
        ├── kustomization.yaml
        └── replica_count.yaml

Take the work from step (1) above, move it into a someApp subdirectory called base, then place overlays in a sibling directory.

An overlay is just another kustomization, refering to the base, and referring to patches to apply to that base.

This arrangement makes it easy to manage your configuration with git. The base could have files from an upstream repository managed by someone else. The overlays could be in a repository you own. Arranging the repo clones as siblings on disk avoids the need for git submodules (though that works fine, if you are a submodule fan).

Generate YAML with

kustomize build ~/someApp/overlays/production

The YAML can be directly applied to a cluster:

kustomize build ~/someApp/overlays/production | kubectl apply -f -

Community

To file bugs please read this.

Before working on an implementation, please

Other communication channels
Code of conduct

Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.

Directories

Path Synopsis
configmapandsecret
Package configmapandsecret generates configmaps and secrets per generator rules.
Package configmapandsecret generates configmaps and secrets per generator rules.
kunstruct
Package kunstruct provides unstructured from api machinery and factory for creating unstructured Package kunstruct provides unstructured from api machinery and factory for creating unstructured
Package kunstruct provides unstructured from api machinery and factory for creating unstructured Package kunstruct provides unstructured from api machinery and factory for creating unstructured
transformer
Package transformer provides transformer factory
Package transformer provides transformer factory
validator
Package validator provides functions to validate labels, annotations, namespaces and configmap/secret keys using apimachinery functions.
Package validator provides functions to validate labels, annotations, namespaces and configmap/secret keys using apimachinery functions.
A dummy main to help with releasing the kustomize API module.
A dummy main to help with releasing the kustomize API module.
pkg
expansion
Package expansion provides functions find and replace $(FOO) style variables in strings.
Package expansion provides functions find and replace $(FOO) style variables in strings.
fs
Package fs provides a file system abstraction layer.
Package fs provides a file system abstraction layer.
git
gvk
ifc
Package ifc holds miscellaneous interfaces used by kustomize.
Package ifc holds miscellaneous interfaces used by kustomize.
image
Package image provides struct definitions and libraries for image overwriting of names, tags and digest.
Package image provides struct definitions and libraries for image overwriting of names, tags and digest.
loader
Package loader has a data loading interface and various implementations.
Package loader has a data loading interface and various implementations.
pgmconfig
Package pgmconfig holds global constants for the kustomize tool.
Package pgmconfig holds global constants for the kustomize tool.
resmap
Package patch holds miscellaneous interfaces used by kustomize.
Package patch holds miscellaneous interfaces used by kustomize.
resource
Package resource implements representations of k8s API resources as "unstructured" objects.
Package resource implements representations of k8s API resources as "unstructured" objects.
target
Package target implements state for the set of all resources to customize.
Package target implements state for the set of all resources to customize.
transformers
Utilities to aid transformer plugins.
Utilities to aid transformer plugins.
transformers/config
Package config provides the functions to load default or user provided configurations for different transformers
Package config provides the functions to load default or user provided configurations for different transformers
transformers/config/defaultconfig
Package defaultconfig provides the default transformer configurations
Package defaultconfig provides the default transformer configurations
types
Package types holds struct definitions that should find a better home.
Package types holds struct definitions that should find a better home.
validators
Package validators defines a FakeValidator that can be used in tests
Package validators defines a FakeValidator that can be used in tests
See docs/plugins.md to learn about plugins.
See docs/plugins.md to learn about plugins.
builtin
Code generated by pluginator on AnnotationsTransformer; DO NOT EDIT.
Code generated by pluginator on AnnotationsTransformer; DO NOT EDIT.
internal
kusterr
Package error has contextual error types.
Package error has contextual error types.
loadertest
Package loadertest holds a fake for the Loader interface.
Package loadertest holds a fake for the Loader interface.

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