kubernetes.core.k8s_exec – Execute command in Pod

Note

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

To install it use: ansible-galaxy collection install kubernetes.core.

To use it in a playbook, specify: kubernetes.core.k8s_exec.

New in version 0.10.0: of kubernetes.core

Synopsis

• Use the Kubernetes Python client to execute command on K8s pods.

Note

This module has a corresponding action plugin.

Requirements

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

• python >= 2.7

• openshift == 0.4.3

• PyYAML >= 3.11

Parameters

Parameter	Choices/Defaults	Comments
api_key string		Token used to authenticate with the API. Can also be specified via K8S_AUTH_API_KEY environment variable.
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. aliases: ssl_ca_cert
client_cert path		Path to a certificate used to authenticate with the API. Can also be specified via K8S_AUTH_CERT_FILE environment variable. aliases: cert_file
client_key path		Path to a key file used to authenticate with the API. Can also be specified via K8S_AUTH_KEY_FILE environment variable. aliases: key_file
command string / required		The command to execute
container string		The name of the container in the pod to connect to. Defaults to only container if there is only one container in the pod.
context string		The name of a context found in the config file. Can also be specified via K8S_AUTH_CONTEXT environment variable.
host string		Provide a URL for accessing the API. Can also be specified via K8S_AUTH_HOST environment variable.
kubeconfig path		Path to an existing Kubernetes config file. If not provided, and no other connection options are provided, the openshift client will attempt to load the default configuration file from ~/.kube/config.json. Can also be specified via K8S_AUTH_KUBECONFIG environment variable.
namespace string / required		The pod namespace name
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	Choices: no yes	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
pod string / required		The pod name
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).
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 k8s_auth module, as that might do what you need.
validate_certs boolean	Choices: no yes	Whether or not to verify the API server's SSL certificates. Can also be specified via K8S_AUTH_VERIFY_SSL environment variable. aliases: verify_ssl

Notes

Note

• Return code return_code for the command executed is added in output in version 1.0.0.

• The authenticated user must have at least read access to the pods resource and write access to the pods/exec resource.

• The OpenShift Python client wraps the K8s Python client, providing full access to all of the APIS and models available on both platforms. For API version details and additional information visit https://github.com/openshift/openshift-restclient-python

• 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: Execute a command
  kubernetes.core.k8s_exec:
    namespace: myproject
    pod: zuul-scheduler
    command: zuul-scheduler full-reconfigure

- name: Check RC status of command executed
  kubernetes.core.k8s_exec:
    namespace: myproject
    pod: busybox-test
    command: cmd_with_non_zero_exit_code
  register: command_status
  ignore_errors: True

- name: Check last command status
  debug:
    msg: "cmd failed"
  when: command_status.return_code != 0

Return Values

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

Key		Returned	Description
result complex		success	The command object
	return_code integer	success	The command status code
	stderr string	success	The command stderr
	stderr_lines string	success	The command stderr
	stdout string	success	The command stdout
	stdout_lines string	success	The command stdout

Authors

• Tristan de Cacqueray (@tristanC)