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_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
      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

• This module is not guaranteed to have a backwards compatible interface. [preview]

• This module is maintained by the Ansible Community. [community]

Authors

• KubeVirt Team (@kubevirt)

Hint

If you notice any issues in this documentation, you can edit this document to improve it.