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kapitan validate

Validates the schema of compiled output. Validate options are specified in the inventory under parameters.kapitan.validate. Supported types are:

Usage

  1. Manually via command line after compile:

    $ kapitan validate

  2. Automatically, together with compile:

    $ kapitan compile --validate

Kubernetes manifests

Overview

Kubernetes resources are identified by their kind. For example, they are:

  • service
  • deployment
  • statefulset

The manifest for each kind has certain restrictions such as required properties. Using kapitan, you can validate against the schemas to confirm that your compiled output indeed is a valid kubernetes manifest.

First time they are used, the schemas for kubernetes manifests are dynamically downloaded from https://kubernetesjsonschema.dev. Those schemas will be cached into ./schemas/ by default, which can be modified using --schemas-path option. However, it is recommended to use .kapitan configuration as follows to avoid the need of typing down this option for every command:

$ cat .kapitan
# other options abbreviated for clarity
validate:
  schemas-path: custom/schemas/cache/path

Example

Refer to the minikube-es inventory in kapitan inventory. To validate the schema of the compiled StatefulSet manifest at compiled/minikube-es/manifests/es-client.yml (created by components/elasticsearch/main.jsonnet), add kapitan.validate parameters in minikube-es inventory:

kapitan:
  vars:
    target: ${target_name}
    namespace: ${target_name}
  compile:
  - output_path: manifests
    input_type: jsonnet
    input_paths:
      - components/elasticsearch/main.jsonnet

    ### other inputs abbreviated for clarity ###
  validate:
  - output_paths:
      - manifests/es-client.yml
    type: kubernetes
    kind: statefulset # note that it is in lowercase
    version: 1.14.0 # optional, defaults to 1.14.0

Then run:

$ kapitan validate -t minikube-es

invalid 'statefulset' manifest at ./compiled/minikube-es/manifests/es-client.yml
['spec'] 'selector' is a required property