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

New in version 2.8.

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.

Requirements

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

  • python >= 2.7

  • urllib3

  • requests

  • requests-oauthlib

Parameters

Parameter Choices/Defaults Comments
api_key
-
When state is set to absent, this specifies the token to revoke.
ca_cert
-
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.

aliases: ssl_ca_cert
host
- / required
Provide a URL for accessing the API server.
password
-
Provide a password for authenticating with the API server.
state
-
    Choices:
  • present ←
  • absent
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.
username
-
Provide a username for authenticating with the API server.
validate_certs
boolean
    Choices:
  • no
  • yes ←
Whether or not to verify the API server's SSL certificates.

aliases: verify_ssl

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)
      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
      k8s_facts:
        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
      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 Returned Description
k8s_auth
complex
 success
Kubernetes authentication facts.
  api_key
string
 success
Authentication token.
  ca_cert
string
 success
Path to a CA certificate file used to verify connection to the API server.
  host
string
 success
URL for accessing the API server.
  username
string
 success
Username for authenticating with the API server.
  validate_certs
boolean
 success
Whether or not to verify the API server's SSL certificates.


Status

Authors

  • KubeVirt Team (@kubevirt)

Hint

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