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: 0.6.4
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_COMMAND_REMOVE_ARGUMENTS	User custom arguments to remove from command line before calling the linter 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_UNSECURED_ENV_VARIABLES	List of env variables explicitly not filtered before calling KUBERNETES_KUBECONFORM and its pre/post commands	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 (use `any` to always activate the linter)	`kubernetes`

MegaLinter Flavours

This linter is available in the following flavours

Flavor	Description	Embedded linters
all	Default MegaLinter Flavor	121
c_cpp	Optimized for pure C/C++ projects	55
cupcake	MegaLinter for the most commonly used languages	85
documentation	MegaLinter for documentation projects	51
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go	Optimized for GO based projects	53
java	Optimized for JAVA based projects	55
javascript	Optimized for JAVASCRIPT or TYPESCRIPT based projects	60
php	Optimized for PHP based projects	54
python	Optimized for PYTHON based projects	62
ruby	Optimized for RUBY based projects	51
rust	Optimized for RUST based projects	51
salesforce	Optimized for Salesforce based projects	55
security	Optimized for security	24
swift	Optimized for SWIFT based projects	51
terraform	Optimized for TERRAFORM based projects	55

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, pretty, 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/