kubespray/roles/upgrade/pre-upgrade/tasks/main.yml

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---
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# Node Ready: type = ready, status = True
# Node NotReady: type = ready, status = Unknown
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- name: See if node is in ready state
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shell: >-
{{ bin_dir }}/kubectl get node {{ inventory_hostname }}
-o jsonpath='{ range .status.conditions[?(@.type == "Ready")].status }{ @ }{ end }'
register: kubectl_node_ready
delegate_to: "{{ groups['kube-master'][0] }}"
failed_when: false
# SchedulingDisabled: unschedulable = true
# else unschedulable key doesn't exist
- name: See if node is schedulable
shell: >-
{{ bin_dir }}/kubectl get node {{ inventory_hostname }}
-o jsonpath='{ .spec.unschedulable }'
register: kubectl_node_schedulable
delegate_to: "{{ groups['kube-master'][0] }}"
failed_when: false
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- set_fact:
needs_cordoning: >-
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{% if kubectl_node_ready.stdout == "True" and kubectl_node_schedulable.stdout == "" -%}
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true
{%- else -%}
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false
{%- endif %}
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- name: Cordon node
command: "{{ bin_dir }}/kubectl cordon {{ inventory_hostname }}"
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delegate_to: "{{ groups['kube-master'][0] }}"
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when: needs_cordoning
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- name: Drain node
command: >-
{{ bin_dir }}/kubectl drain
--force
--ignore-daemonsets
--grace-period {{ drain_grace_period }}
--timeout {{ drain_timeout }}
--delete-local-data {{ inventory_hostname }}
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delegate_to: "{{ groups['kube-master'][0] }}"
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when: needs_cordoning