Support the selector option in the k8s module when applying service definitions

[geekifier]

SUMMARY

This is a copy of the following GH issue: ansible/ansible#67316.

The k8s module should support specifying selectors when applying resource definitions, similar to how kubectl supports it.

ISSUE TYPE

• Feature Idea

COMPONENT NAME

k8s module

ADDITIONAL INFORMATION

Some commonly used projects, such as Knative, require you to apply the Custom Resource Definitions (CRDs) to the K8s cluster, before you can deploy the rest of the service definition.

See: https://knative.dev/v0.11-docs/install/knative-with-any-k8s/#installing-knative.

Without the support for specifying selectors, this is not possible in Ansible without having to use a 3rd party binary (kubectl).

# example 
- name: Install Knative CRDs                                                                                                                                                                                      
  k8s:                                   
    state: present
    src: "{{ item.dest }}"
    context: "{{ k8s_cluster | mandatory }}" 
    # this does not work
   selector:
     - 'knative.dev/crd-install=true'    
    validate:
      fail_on_error: yes                                                                                                                                                                                   
  with_items:
    - "{{ knative_install_files.results }}"

# output

msg: 'Unsupported parameters for (k8s) module: selector Supported parameters include: api_key, api_version, append_hash, apply, ca_cert, client_cert, client_key, context, force, host, kind, kubeconfig, merge_type, name, namespace, password, proxy, resource_definition, src, state, username, validate, validate_certs, wait, wait_condition, wait_sleep, wait_timeout'

Sample kubectl command utilizing selectors:

kubectl apply --selector knative.dev/crd-install=true \
--filename https://github.com/knative/serving/releases/download/v0.11.0/serving.yaml \
--filename https://github.com/knative/eventing/releases/download/v0.11.0/release.yaml \
--filename https://github.com/knative/serving/releases/download/v0.11.0/monitoring.yaml

[abikouo]

@geekifier thanks for suggesting this feature, we are currently working on it and let you know once it is ready

[Akasurde]

@geekifier Could you please check if PR #158 works for you and let us know? Thanks.

[Akasurde]

resolved_by_pr #158