kustomize

command module
Version: v2.0.3+incompatible Latest Latest
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Published: Mar 5, 2019 License: Apache-2.0 Imports: 3 Imported by: 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 editted text.

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

Build Status Go Report Card

Installation: Download a binary from the release page, or see these install notes. Then try one of the tested examples.

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

Filing bug reports
A good report specifies
  • the output of kustomize version,
  • the input (the content of kustomization.yaml and any files it refers to),
  • the expected YAML output.
A great report is a bug reproduction test

Kustomize has a simple test harness in the target package for specifying a kustomization's input and the expected output. See this example of a target test.

The pattern is

  • call NewKustTestHarness
  • specify kustomization input data (resources, patches, etc.) as inline strings,
  • call makeKustTarget().MakeCustomizedResMap()
  • compare the actual output to expected output

In a bug reproduction test, the expected output string initially contains the wrong (unexpected) output, thus unambiguously reproducing the bug.

Nearby comments should explain what the output should be, and have a TODO pointing to the related issue.

The person who fixes the bug then has a clear bug reproduction and a test to modify when the bug is fixed.

The bug reporter can then see the bug was fixed, and has permanent regression coverage to prevent its reintroduction.

Feature requests

Feature requests are welcome.

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.

Documentation

The Go Gopher

There is no documentation for this package.

Source Files

Directories

Path Synopsis
api module
cmd
config Module
depprobcheck Module
gorepomod Module
k8scopy Module
kubectl Module
kyaml Module
mdtogo Module
pluginator Module
prchecker Module
resource Module
Package k8sdeps provides kustomize factory with k8s dependencies
Package k8sdeps provides kustomize factory with k8s dependencies
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
kv
transformer
Package transformer provides transformer factory
Package transformer provides transformer factory
validator
Package validator provides functions to validate labels, annotations, namespace using apimachinery
Package validator provides functions to validate labels, annotations, namespace using apimachinery
kstatus module
kustomize module
kyaml module
pkg
commands
Package commands holds the CLI glue mapping textual commands/args to method calls.
Package commands holds the CLI glue mapping textual commands/args to method calls.
constants
Package constants holds global constants for the kustomize tool.
Package constants holds global constants for the kustomize tool.
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.
ifc/transformer
Package patch holds miscellaneous interfaces used by kustomize.
Package patch 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.
resmap
Package resmap implements a map from ResId to Resource that tracks all resources in a kustomization.
Package resmap implements a map from ResId to Resource that tracks all resources in a kustomization.
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
Package transformers has implementations of resmap.ResMap transformers.
Package transformers has implementations of resmap.ResMap transformers.
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
plugin
pluginator module
pseudo
k8s Module
internal
tools Module

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