kubeconform

kubeconform is a schema-aware Kubernetes manifest validation tool, that tends to have more up-to-date schema definitions than kubeval.

kubeconform documentation

Version in MegaLinter: 0.6.1
Visit Official Web Site

Configuration in MegaLinter

Enable kubeconform by adding KUBERNETES_KUBECONFORM in ENABLE_LINTERS variable
Disable kubeconform by adding KUBERNETES_KUBECONFORM in DISABLE_LINTERS variable

Variable	Description	Default value
KUBERNETES_KUBECONFORM_ARGUMENTS	User custom arguments to add in linter CLI call Ex: `-s --foo "bar"`
KUBERNETES_KUBECONFORM_FILTER_REGEX_INCLUDE	Custom regex including filter Ex: `(src\\|lib)`	Include every file
KUBERNETES_KUBECONFORM_FILTER_REGEX_EXCLUDE	Custom regex excluding filter Ex: `(test\\|examples)`	Exclude no file
KUBERNETES_KUBECONFORM_CLI_LINT_MODE	Override default CLI lint mode - `file`: Calls the linter for each file - `list_of_files`: Call the linter with the list of files as argument - `project`: Call the linter from the root of the project	`list_of_files`
KUBERNETES_KUBECONFORM_FILE_EXTENSIONS	Allowed file extensions. `"*"` matches any extension, `""` matches empty extension. Empty list excludes all files Ex: `[".py", ""]`	`[".yml", ".yaml", ".json"]`
KUBERNETES_KUBECONFORM_FILE_NAMES_REGEX	File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files Ex: `["Dockerfile(-.+)?", "Jenkinsfile"]`	Include every file
KUBERNETES_KUBECONFORM_PRE_COMMANDS	List of bash commands to run before the linter	None
KUBERNETES_KUBECONFORM_POST_COMMANDS	List of bash commands to run after the linter	None
KUBERNETES_KUBECONFORM_DISABLE_ERRORS	Run linter but consider errors as warnings	`false`
KUBERNETES_KUBECONFORM_DISABLE_ERRORS_IF_LESS_THAN	Maximum number of errors allowed	`0`
KUBERNETES_KUBECONFORM_CLI_EXECUTABLE	Override CLI executable	`['kubeconform']`
KUBERNETES_DIRECTORY	Directory containing KUBERNETES files	`kubernetes`

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Behind the scenes

How are identified applicable files

Activated only if sub-directory kubernetes is found. (directory name can be overridden with KUBERNETES_DIRECTORY)
File extensions: .yml, .yaml, .json
Detected file content (regex): apiVersion:, kustomize\.config\.k8s\.io, tekton

How the linting is performed

kubeconform is called once with the list of files as arguments (list_of_files CLI lint mode)

Example calls

kubeconform myfile.yml

kubeconform -ignore-missing-schemas -skip SomeCRD,AnotherCRD -kubernetes-version '1.18.0' -strict myfile.yml

Help content

Usage: kubeconform [OPTION]... [FILE OR FOLDER]...
  -cache string
      cache schemas downloaded via HTTP to this folder
  -debug
      print debug information
  -exit-on-error
      immediately stop execution when the first error is encountered
  -h  show help information
  -ignore-filename-pattern value
      regular expression specifying paths to ignore (can be specified multiple times)
  -ignore-missing-schemas
      skip files with missing schemas instead of failing
  -insecure-skip-tls-verify
      disable verification of the server's SSL certificate. This will make your HTTPS connections insecure
  -kubernetes-version string
      version of Kubernetes to validate against, e.g.: 1.18.0 (default "master")
  -n int
      number of goroutines to run concurrently (default 4)
  -output string
      output format - json, junit, tap, text (default "text")
  -reject string
      comma-separated list of kinds or GVKs to reject
  -schema-location value
      override schemas location search path (can be specified multiple times)
  -skip string
      comma-separated list of kinds or GVKs to ignore
  -strict
      disallow additional properties not in schema or duplicated keys
  -summary
      print a summary at the end (ignored for junit output)
  -v  show version information
  -verbose
      print results for all resources (ignored for tap and junit output)

Installation on mega-linter Docker image

Dockerfile commands :

FROM ghcr.io/yannh/kubeconform:latest-alpine as kubeconform
COPY --link --from=kubeconform /kubeconform /usr/bin/