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kubernetes.core.k8s_drain module – Drain, Cordon, or Uncordon node in k8s cluster

Note

This module is part of the kubernetes.core collection (version 2.3.2).

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. You need further requirements to be able to use this module, see Requirements for details.

To use it in a playbook, specify: kubernetes.core.k8s_drain.

New in kubernetes.core 2.2.0

Synopsis 

Drain node in preparation for maintenance same as kubectl drain.
Cordon will mark the node as unschedulable.
Uncordon will mark the node as schedulable.
The given node will be marked unschedulable to prevent new pods from arriving.
Then drain deletes all pods except mirror pods (which cannot be deleted through the API server).

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

Parameters 

Parameter	Comments
api_key string	Token used to authenticate with the API. Can also be specified via K8S_AUTH_API_KEY environment variable.
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.
delete_options dictionary	Specify options to delete pods. This option has effect only when `state` is set to drain.
delete_emptydir_data boolean added in kubernetes.core 2.3.0	Continue even if there are pods using emptyDir (local data that will be deleted when the node is drained). Choices: `false` ← (default) `true`
disable_eviction boolean	Forces drain to use delete rather than evict. Choices: `false` ← (default) `true`
force boolean	Continue even if there are pods not managed by a ReplicationController, Job, or DaemonSet. Choices: `false` ← (default) `true`
ignore_daemonsets boolean	Ignore DaemonSet-managed pods. Choices: `false` ← (default) `true`
terminate_grace_period integer	Specify how many seconds to wait before forcefully terminating. If not specified, the default grace period for the object type will be used. The value zero indicates delete immediately.
wait_sleep integer	Number of seconds to sleep between checks. Ignored if `wait_timeout` is not set. Default: `5`
wait_timeout integer	The length of time to wait in seconds for pod to be deleted before giving up, zero means infinite.
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 kubernetes.core 2.3.0	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 kubernetes.core 2.3.0	Username to impersonate for the operation. Can also be specified via K8S_AUTH_IMPERSONATE_USER environment.
kubeconfig any	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.
name string / required	The name of the node.
no_proxy string added in kubernetes.core 2.3.0	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: `false` `true`
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 kubernetes.core 2.0.0	The Header used for the HTTP proxy. Documentation can be found here https://urllib3.readthedocs.io/en/latest/reference/urllib3.util.html?highlight%3Dproxy_headers#urllib3.util.make_headers.
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.
state string	Determines whether to drain, cordon, or uncordon node. Choices: `"cordon"` `"drain"` ← (default) `"uncordon"`
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: `false` `true`

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: Drain node "foo", even if there are pods not managed by a ReplicationController, Job, or DaemonSet on it.
  kubernetes.core.k8s_drain:
    state: drain
    name: foo
    force: yes

- name: Drain node "foo", but abort if there are pods not managed by a ReplicationController, Job, or DaemonSet, and use a grace period of 15 minutes.
  kubernetes.core.k8s_drain:
    state: drain
    name: foo
    delete_options:
        terminate_grace_period: 900

- name: Mark node "foo" as schedulable.
  kubernetes.core.k8s_drain:
    state: uncordon
    name: foo

- name: Mark node "foo" as unschedulable.
  kubernetes.core.k8s_drain:
    state: cordon
    name: foo

Return Values 

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

Key	Description
result string	The node status and the number of pods deleted. Returned: success

Authors

Aubin Bikouo (@abikouo)

Collection links

Issue Tracker Repository (Sources)

kubernetes.core.k8s_drain module – Drain, Cordon, or Uncordon node in k8s cluster

Synopsis

Requirements

Parameters

Notes

Examples

Return Values

Authors

Collection links

Synopsis 

Requirements 

Parameters 

Notes 

Examples 

Return Values 