kubernetes.core.k8s_info module – Describe Kubernetes (K8s) objects

Note

This module is part of the kubernetes.core collection (version 2.3.1).

You might already have this collection installed if you are using the ansible package. It is not included in ansible-core. To check whether it is installed, run ansible-galaxy collection list.

To install it, use: ansible-galaxy collection install kubernetes.core.

To use it in a playbook, specify: kubernetes.core.k8s_info.

Synopsis

  • Use the Kubernetes Python client to perform read operations on K8s objects.

  • Access to the full range of K8s APIs.

  • Authenticate using either a config file, certificates, password or token.

  • Supports check mode.

  • This module was called k8s_facts before Ansible 2.9. The usage did not change.

Note

This module has a corresponding action plugin.

Requirements

The below requirements are needed on the host that executes this module.

  • python >= 3.6

  • kubernetes >= 12.0.0

  • PyYAML >= 3.11

Parameters

Parameter

Comments

api_key

string

Token used to authenticate with the API. Can also be specified via K8S_AUTH_API_KEY environment variable.

api_version

aliases: api, version

string

Use to specify the API version.

Use to create, delete, or discover an object without providing a full resource definition.

Use in conjunction with kind, name, and namespace to identify a specific object.

If resource definition is provided, the apiVersion value from the resource_definition will override this option.

Default: “v1”

ca_cert

aliases: ssl_ca_cert

path

Path to a CA certificate used to authenticate with the API. The full certificate chain must be provided to avoid certificate validation errors. Can also be specified via K8S_AUTH_SSL_CA_CERT environment variable.

client_cert

aliases: cert_file

path

Path to a certificate used to authenticate with the API. Can also be specified via K8S_AUTH_CERT_FILE environment variable.

client_key

aliases: key_file

path

Path to a key file used to authenticate with the API. Can also be specified via K8S_AUTH_KEY_FILE environment variable.

context

string

The name of a context found in the config file. Can also be specified via K8S_AUTH_CONTEXT environment variable.

field_selectors

list / elements=string

List of field selectors to use to filter results

host

string

Provide a URL for accessing the API. Can also be specified via K8S_AUTH_HOST environment variable.

impersonate_groups

list / elements=string

added in 2.3.0 of kubernetes.core

Group(s) to impersonate for the operation.

Can also be specified via K8S_AUTH_IMPERSONATE_GROUPS environment. Example: Group1,Group2

impersonate_user

string

added in 2.3.0 of kubernetes.core

Username to impersonate for the operation.

Can also be specified via K8S_AUTH_IMPERSONATE_USER environment.

kind

string / required

Use to specify an object model.

Use to create, delete, or discover an object without providing a full resource definition.

Use in conjunction with api_version, name, and namespace to identify a specific object.

If resource definition is provided, the kind value from the resource_definition will override this option.

kubeconfig

raw

Path to an existing Kubernetes config file. If not provided, and no other connection options are provided, the Kubernetes client will attempt to load the default configuration file from ~/.kube/config. Can also be specified via K8S_AUTH_KUBECONFIG environment variable.

The kubernetes configuration can be provided as dictionary. This feature requires a python kubernetes client version >= 17.17.0. Added in version 2.2.0.

label_selectors

list / elements=string

List of label selectors to use to filter results

name

string

Use to specify an object name.

Use to create, delete, or discover an object without providing a full resource definition.

Use in conjunction with api_version, kind and namespace to identify a specific object.

If resource definition is provided, the metadata.name value from the resource_definition will override this option.

namespace

string

Use to specify an object namespace.

Useful when creating, deleting, or discovering an object without providing a full resource definition.

Use in conjunction with api_version, kind, and name to identify a specific object.

If resource definition is provided, the metadata.namespace value from the resource_definition will override this option.

no_proxy

string

added in 2.3.0 of kubernetes.core

The comma separated list of hosts/domains/IP/CIDR that shouldn’t go through proxy. Can also be specified via K8S_AUTH_NO_PROXY environment variable.

Please note that this module does not pick up typical proxy settings from the environment (e.g. NO_PROXY).

This feature requires kubernetes>=19.15.0. When kubernetes library is less than 19.15.0, it fails even no_proxy set in correct.

example value is “localhost,.local,.example.com,127.0.0.1,127.0.0.0/8,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16”

password

string

Provide a password for authenticating with the API. Can also be specified via K8S_AUTH_PASSWORD environment variable.

Please read the description of the username option for a discussion of when this option is applicable.

persist_config

boolean

Whether or not to save the kube config refresh tokens. Can also be specified via K8S_AUTH_PERSIST_CONFIG environment variable.

When the k8s context is using a user credentials with refresh tokens (like oidc or gke/gcloud auth), the token is refreshed by the k8s python client library but not saved by default. So the old refresh token can expire and the next auth might fail. Setting this flag to true will tell the k8s python client to save the new refresh token to the kube config file.

Default to false.

Please note that the current version of the k8s python client library does not support setting this flag to True yet.

The fix for this k8s python library is here: https://github.com/kubernetes-client/python-base/pull/169

Choices:

  • no

  • yes

proxy

string

The URL of an HTTP proxy to use for the connection. Can also be specified via K8S_AUTH_PROXY environment variable.

Please note that this module does not pick up typical proxy settings from the environment (e.g. HTTP_PROXY).

proxy_headers

dictionary

added in 2.0.0 of kubernetes.core

basic_auth

string

Colon-separated username:password for basic authentication header.

Can also be specified via K8S_AUTH_PROXY_HEADERS_BASIC_AUTH environment.

proxy_basic_auth

string

Colon-separated username:password for proxy basic authentication header.

Can also be specified via K8S_AUTH_PROXY_HEADERS_PROXY_BASIC_AUTH environment.

user_agent

string

String representing the user-agent you want, such as foo/1.0.

Can also be specified via K8S_AUTH_PROXY_HEADERS_USER_AGENT environment.

username

string

Provide a username for authenticating with the API. Can also be specified via K8S_AUTH_USERNAME environment variable.

Please note that this only works with clusters configured to use HTTP Basic Auth. If your cluster has a different form of authentication (e.g. OAuth2 in OpenShift), this option will not work as expected and you should look into the community.okd.k8s_auth module, as that might do what you need.

validate_certs

aliases: verify_ssl

boolean

Whether or not to verify the API server’s SSL certificates. Can also be specified via K8S_AUTH_VERIFY_SSL environment variable.

Choices:

  • no

  • yes

wait

boolean

Whether to wait for certain resource kinds to end up in the desired state.

By default the module exits once Kubernetes has received the request.

Implemented for state=present for Deployment, DaemonSet and Pod, and for state=absent for all resource kinds.

For resource kinds without an implementation, wait returns immediately unless wait_condition is set.

Choices:

  • no ← (default)

  • yes

wait_condition

dictionary

Specifies a custom condition on the status to wait for.

Ignored if wait is not set or is set to False.

reason

string

The value of the reason field in your desired condition

For example, if a Deployment is paused, The Progressing type will have the DeploymentPaused reason.

The possible reasons in a condition are specific to each resource type in Kubernetes.

See the API documentation of the status field for a given resource to see possible choices.

status

string

The value of the status field in your desired condition.

For example, if a Deployment is paused, the Progressing type will have the Unknown status.

Choices:

  • True ← (default)

  • False

  • Unknown

type

string

The type of condition to wait for.

For example, the Pod resource will set the Ready condition (among others).

Required if you are specifying a wait_condition.

If left empty, the wait_condition field will be ignored.

The possible types for a condition are specific to each resource type in Kubernetes.

See the API documentation of the status field for a given resource to see possible choices.

wait_sleep

integer

Number of seconds to sleep between checks.

Default: 5

wait_timeout

integer

How long in seconds to wait for the resource to end up in the desired state.

Ignored if wait is not set.

Default: 120

Notes

Note

  • To avoid SSL certificate validation errors when validate_certs is True, the full certificate chain for the API server must be provided via ca_cert or in the kubeconfig file.

Examples

- name: Get an existing Service object
  kubernetes.core.k8s_info:
    api_version: v1
    kind: Service
    name: web
    namespace: testing
  register: web_service

- name: Get a list of all service objects
  kubernetes.core.k8s_info:
    api_version: v1
    kind: Service
    namespace: testing
  register: service_list

- name: Get a list of all pods from any namespace
  kubernetes.core.k8s_info:
    kind: Pod
  register: pod_list

- name: Search for all Pods labelled app=web
  kubernetes.core.k8s_info:
    kind: Pod
    label_selectors:
      - app = web
      - tier in (dev, test)

- name: Using vars while using label_selectors
  kubernetes.core.k8s_info:
    kind: Pod
    label_selectors:
      - "app = {{ app_label_web }}"
  vars:
    app_label_web: web

- name: Search for all running pods
  kubernetes.core.k8s_info:
    kind: Pod
    field_selectors:
      - status.phase=Running

- name: List custom objects created using CRD
  kubernetes.core.k8s_info:
    kind: MyCustomObject
    api_version: "stable.example.com/v1"

- name: Wait till the Object is created
  kubernetes.core.k8s_info:
    kind: Pod
    wait: yes
    name: pod-not-yet-created
    namespace: default
    wait_sleep: 10
    wait_timeout: 360

Return Values

Common return values are documented here, the following are the fields unique to this module:

Key

Description

api_found

boolean

Whether the specified api_version and kind were successfully mapped to an existing API on the targeted cluster.

Version added 1.2.0.

Returned: always

resources

complex

The object(s) that exists

Returned: success

api_version

string

The versioned schema of this representation of an object.

Returned: success

kind

string

Represents the REST resource this object represents.

Returned: success

metadata

dictionary

Standard object metadata. Includes name, namespace, annotations, labels, etc.

Returned: success

spec

dictionary

Specific attributes of the object. Will vary based on the api_version and kind.

Returned: success

status

dictionary

Current status details for the object.

Returned: success

Authors

  • Will Thames (@willthames)