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kubernetes.core.k8s_auth – Authenticate to Kubernetes clusters which require an explicit login step

Note

This plugin is part of the kubernetes.core collection (version 1.2.1).

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_auth.

Synopsis

• This module handles authenticating to Kubernetes clusters requiring explicit authentication procedures, meaning ones where a client logs in (obtains an authentication token), performs API operations using said token and then logs out (revokes the token). An example of a Kubernetes distribution requiring this module is OpenShift.

• On the other hand a popular configuration for username+password authentication is one utilizing HTTP Basic Auth, which does not involve any additional login/logout steps (instead login credentials can be attached to each and every API call performed) and as such is handled directly by the k8s module (and other resource–specific modules) by utilizing the host, username and password parameters. Please consult your preferred module’s documentation for more details.

Note

This module has a corresponding action plugin.

Requirements

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

• python >= 2.7

• urllib3

• requests

• requests-oauthlib

Parameters

Parameter	Comments
api_key string	When state is set to absent, this specifies the token to revoke.
ca_cert aliases: ssl_ca_cert path	Path to a CA certificate file used to verify connection to the API server. The full certificate chain must be provided to avoid certificate validation errors.
host string / required	Provide a URL for accessing the API server.
password string	Provide a password for authenticating with the API server.
state string	If set to present connect to the API server using the URL specified in host and attempt to log in. If set to absent attempt to log out by revoking the authentication token specified in api_key. Choices: present ← (default) absent
username string	Provide a username for authenticating with the API server.
validate_certs aliases: verify_ssl boolean	Whether or not to verify the API server’s SSL certificates. Choices: no yes ← (default)

Examples

- hosts: localhost
  module_defaults:
    group/k8s:
      host: https://k8s.example.com/
      ca_cert: ca.pem
  tasks:
  - block:
    # It's good practice to store login credentials in a secure vault and not
    # directly in playbooks.
    - include_vars: k8s_passwords.yml

    - name: Log in (obtain access token)
      kubernetes.core.k8s_auth:
        username: admin
        password: "{{ k8s_admin_password }}"
      register: k8s_auth_results

    # Previous task provides the token/api_key, while all other parameters
    # are taken from module_defaults
    - name: Get a list of all pods from any namespace
      kubernetes.core.k8s_info:
        api_key: "{{ k8s_auth_results.k8s_auth.api_key }}"
        kind: Pod
      register: pod_list

    always:
    - name: If login succeeded, try to log out (revoke access token)
      when: k8s_auth_results.k8s_auth.api_key is defined
      kubernetes.core.k8s_auth:
        state: absent
        api_key: "{{ k8s_auth_results.k8s_auth.api_key }}"

Return Values

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

Key	Description
k8s_auth complex	Kubernetes authentication facts. Returned: success
api_key string	Authentication token. Returned: success
ca_cert string	Path to a CA certificate file used to verify connection to the API server. Returned: success
host string	URL for accessing the API server. Returned: success
username string	Username for authenticating with the API server. Returned: success
validate_certs boolean	Whether or not to verify the API server’s SSL certificates. Returned: success

Authors

• KubeVirt Team (@kubevirt)