.. _kubernetes.core.k8s_log_module:


***********************
kubernetes.core.k8s_log
***********************

**Fetch logs from Kubernetes resources**


Version added: 0.10.0

.. contents::
   :local:
   :depth: 1


Synopsis
--------
- Use the Kubernetes Python client to perform read operations on K8s log endpoints.
- Authenticate using either a config file, certificates, password or token.
- Supports check mode.
- Analogous to `kubectl logs` or `oc logs`



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

- python >= 3.6
- kubernetes >= 12.0.0
- PyYAML >= 3.11


Parameters
----------

.. raw:: html

    <table  border=0 cellpadding=0 class="documentation-table">
        <tr>
            <th colspan="2">Parameter</th>
            <th>Choices/<font color="blue">Defaults</font></th>
            <th width="100%">Comments</th>
        </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>api_key</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Token used to authenticate with the API. Can also be specified via K8S_AUTH_API_KEY environment variable.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>api_version</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                        <b>Default:</b><br/><div style="color: blue">"v1"</div>
                </td>
                <td>
                        <div>Use to specify the API version.</div>
                        <div>Use to create, delete, or discover an object without providing a full resource definition.</div>
                        <div>Use in conjunction with <em>kind</em>, <em>name</em>, and <em>namespace</em> to identify a specific object.</div>
                        <div>If <em>resource definition</em> is provided, the <em>apiVersion</em> value from the <em>resource_definition</em> will override this option.</div>
                        <div style="font-size: small; color: darkgreen"><br/>aliases: api, version</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>ca_cert</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">path</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>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.</div>
                        <div style="font-size: small; color: darkgreen"><br/>aliases: ssl_ca_cert</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>client_cert</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">path</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Path to a certificate used to authenticate with the API. Can also be specified via K8S_AUTH_CERT_FILE environment variable.</div>
                        <div style="font-size: small; color: darkgreen"><br/>aliases: cert_file</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>client_key</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">path</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Path to a key file used to authenticate with the API. Can also be specified via K8S_AUTH_KEY_FILE environment variable.</div>
                        <div style="font-size: small; color: darkgreen"><br/>aliases: key_file</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>container</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Use to specify the container within a pod to grab the log from.</div>
                        <div>If there is only one container, this will default to that container.</div>
                        <div>If there is more than one container, this option is required.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>context</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>The name of a context found in the config file. Can also be specified via K8S_AUTH_CONTEXT environment variable.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>host</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Provide a URL for accessing the API. Can also be specified via K8S_AUTH_HOST environment variable.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>kind</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                        <b>Default:</b><br/><div style="color: blue">"Pod"</div>
                </td>
                <td>
                        <div>Use to specify an object model.</div>
                        <div>Use in conjunction with <em>api_version</em>, <em>name</em>, and <em>namespace</em> to identify a specific object.</div>
                        <div>If using <em>label_selectors</em>, cannot be overridden.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>kubeconfig</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">raw</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>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 <em>~/.kube/config</em>. Can also be specified via K8S_AUTH_KUBECONFIG environment variable.</div>
                        <div>The kubernetes configuration can be provided as dictionary. This feature requires a python kubernetes client version &gt;= 17.17.0. Added in version 2.2.0.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>label_selectors</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">list</span>
                         / <span style="color: purple">elements=string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>List of label selectors to use to filter results</div>
                        <div>Only one of <em>name</em> or <em>label_selectors</em> may be provided.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>name</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Use to specify an object name.</div>
                        <div>Use in conjunction with <em>api_version</em>, <em>kind</em> and <em>namespace</em> to identify a specific object.</div>
                        <div>Only one of <em>name</em> or <em>label_selectors</em> may be provided.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>namespace</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Use to specify an object namespace.</div>
                        <div>Useful when creating, deleting, or discovering an object without providing a full resource definition.</div>
                        <div>Use in conjunction with <em>api_version</em>, <em>kind</em>, and <em>name</em> to identify a specific object.</div>
                        <div>If <em>resource definition</em> is provided, the <em>metadata.namespace</em> value from the <em>resource_definition</em> will override this option.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>password</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Provide a password for authenticating with the API. Can also be specified via K8S_AUTH_PASSWORD environment variable.</div>
                        <div>Please read the description of the <code>username</code> option for a discussion of when this option is applicable.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>persist_config</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">boolean</span>
                    </div>
                </td>
                <td>
                        <ul style="margin: 0; padding: 0"><b>Choices:</b>
                                    <li>no</li>
                                    <li>yes</li>
                        </ul>
                </td>
                <td>
                        <div>Whether or not to save the kube config refresh tokens. Can also be specified via K8S_AUTH_PERSIST_CONFIG environment variable.</div>
                        <div>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.</div>
                        <div>Default to false.</div>
                        <div>Please note that the current version of the k8s python client library does not support setting this flag to True yet.</div>
                        <div>The fix for this k8s python library is here: https://github.com/kubernetes-client/python-base/pull/169</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>proxy</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>The URL of an HTTP proxy to use for the connection. Can also be specified via K8S_AUTH_PROXY environment variable.</div>
                        <div>Please note that this module does not pick up typical proxy settings from the environment (e.g. HTTP_PROXY).</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>proxy_headers</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">dictionary</span>
                    </div>
                    <div style="font-style: italic; font-size: small; color: darkgreen">added in 2.0.0</div>
                </td>
                <td>
                </td>
                <td>
                        <div>The Header used for the HTTP proxy.</div>
                        <div>Documentation can be found here <a href='https://urllib3.readthedocs.io/en/latest/reference/urllib3.util.html?highlight=proxy_headers#urllib3.util.make_headers'>https://urllib3.readthedocs.io/en/latest/reference/urllib3.util.html?highlight=proxy_headers#urllib3.util.make_headers</a>.</div>
                </td>
            </tr>
                                <tr>
                    <td class="elbow-placeholder"></td>
                <td colspan="1">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>basic_auth</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Colon-separated username:password for basic authentication header.</div>
                        <div>Can also be specified via K8S_AUTH_PROXY_HEADERS_BASIC_AUTH environment.</div>
                </td>
            </tr>
            <tr>
                    <td class="elbow-placeholder"></td>
                <td colspan="1">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>proxy_basic_auth</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Colon-separated username:password for proxy basic authentication header.</div>
                        <div>Can also be specified via K8S_AUTH_PROXY_HEADERS_PROXY_BASIC_AUTH environment.</div>
                </td>
            </tr>
            <tr>
                    <td class="elbow-placeholder"></td>
                <td colspan="1">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>user_agent</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>String representing the user-agent you want, such as foo/1.0.</div>
                        <div>Can also be specified via K8S_AUTH_PROXY_HEADERS_USER_AGENT environment.</div>
                </td>
            </tr>

            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>since_seconds</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                    <div style="font-style: italic; font-size: small; color: darkgreen">added in 2.2.0</div>
                </td>
                <td>
                </td>
                <td>
                        <div>A relative time in seconds before the current time from which to show logs.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>username</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">string</span>
                    </div>
                </td>
                <td>
                </td>
                <td>
                        <div>Provide a username for authenticating with the API. Can also be specified via K8S_AUTH_USERNAME environment variable.</div>
                        <div>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 <span class='module'>community.okd.k8s_auth</span> module, as that might do what you need.</div>
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <div class="ansibleOptionAnchor" id="parameter-"></div>
                    <b>validate_certs</b>
                    <a class="ansibleOptionLink" href="#parameter-" title="Permalink to this option"></a>
                    <div style="font-size: small">
                        <span style="color: purple">boolean</span>
                    </div>
                </td>
                <td>
                        <ul style="margin: 0; padding: 0"><b>Choices:</b>
                                    <li>no</li>
                                    <li>yes</li>
                        </ul>
                </td>
                <td>
                        <div>Whether or not to verify the API server&#x27;s SSL certificates. Can also be specified via K8S_AUTH_VERIFY_SSL environment variable.</div>
                        <div style="font-size: small; color: darkgreen"><br/>aliases: verify_ssl</div>
                </td>
            </tr>
    </table>
    <br/>


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
--------

.. code-block:: yaml

    - name: Get a log from a Pod
      kubernetes.core.k8s_log:
        name: example-1
        namespace: testing
      register: log

    # This will get the log from the first Pod found matching the selector
    - name: Log a Pod matching a label selector
      kubernetes.core.k8s_log:
        namespace: testing
        label_selectors:
        - app=example
      register: log

    # This will get the log from a single Pod managed by this Deployment
    - name: Get a log from a Deployment
      kubernetes.core.k8s_log:
        api_version: apps/v1
        kind: Deployment
        namespace: testing
        name: example
        since_seconds: "4000"
      register: log

    # This will get the log from a single Pod managed by this DeploymentConfig
    - name: Get a log from a DeploymentConfig
      kubernetes.core.k8s_log:
        api_version: apps.openshift.io/v1
        kind: DeploymentConfig
        namespace: testing
        name: example
      register: log



Return Values
-------------
Common return values are documented `here <https://docs.ansible.com/ansible/latest/reference_appendices/common_return_values.html#common-return-values>`_, the following are the fields unique to this module:

.. raw:: html

    <table border=0 cellpadding=0 class="documentation-table">
        <tr>
            <th colspan="1">Key</th>
            <th>Returned</th>
            <th width="100%">Description</th>
        </tr>
            <tr>
                <td colspan="1">
                    <div class="ansibleOptionAnchor" id="return-"></div>
                    <b>log</b>
                    <a class="ansibleOptionLink" href="#return-" title="Permalink to this return value"></a>
                    <div style="font-size: small">
                      <span style="color: purple">string</span>
                    </div>
                </td>
                <td>success</td>
                <td>
                            <div>The text log of the object</div>
                    <br/>
                </td>
            </tr>
            <tr>
                <td colspan="1">
                    <div class="ansibleOptionAnchor" id="return-"></div>
                    <b>log_lines</b>
                    <a class="ansibleOptionLink" href="#return-" title="Permalink to this return value"></a>
                    <div style="font-size: small">
                      <span style="color: purple">list</span>
                    </div>
                </td>
                <td>success</td>
                <td>
                            <div>The log of the object, split on newlines</div>
                    <br/>
                </td>
            </tr>
    </table>
    <br/><br/>


Status
------


Authors
~~~~~~~

- Fabian von Feilitzsch (@fabianvf)
