Rename master to control plane - non-breaking changes only (#11394)

K8s is moving away from the "master" terminology, so kubespray should follow the same naming conventions. See 65d886bb30/sig-architecture/naming/recommendations/001-master-control-plane.md

roles/kubernetes/control-plane/tasks/encrypt-at-rest.yml

@@ -23,7 +23,7 @@
     kube_encrypt_token_extracted: "{{ secret_file_decoded | json_query(secrets_encryption_query) | first | b64decode }}"
   when: secrets_encryption_file.stat.exists
 
-- name: Set kube_encrypt_token across master nodes
+- name: Set kube_encrypt_token across control plane nodes
   set_fact:
     kube_encrypt_token: "{{ kube_encrypt_token_extracted }}"
   delegate_to: "{{ item }}"

roles/kubernetes/control-plane/tasks/kubeadm-fix-apiserver.yml

@@ -12,6 +12,6 @@
     - kubelet.conf
     - scheduler.conf
   notify:
-    - "Master | Restart kube-controller-manager"
-    - "Master | Restart kube-scheduler"
-    - "Master | reload kubelet"
+    - "Control plane | Restart kube-controller-manager"
+    - "Control plane | Restart kube-scheduler"
+    - "Control plane | reload kubelet"

roles/kubernetes/control-plane/tasks/kubeadm-setup.yml

@@ -189,7 +189,7 @@
     mode: "0644"
   when: kubeadm_patches is defined and kubeadm_patches.enabled
 
-- name: Kubeadm | Initialize first master
+- name: Kubeadm | Initialize first control plane node
   command: >-
     timeout -k {{ kubeadm_init_timeout }} {{ kubeadm_init_timeout }}
     {{ bin_dir }}/kubeadm init
@@ -205,7 +205,7 @@
   failed_when: kubeadm_init.rc != 0 and "field is immutable" not in kubeadm_init.stderr
   environment:
     PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}"
-  notify: Master | restart kubelet
+  notify: Control plane | restart kubelet
 
 - name: Set kubeadm certificate key
   set_fact:
@@ -250,7 +250,7 @@
   tags:
     - kubeadm_token
 
-- name: Kubeadm | Join other masters
+- name: Kubeadm | Join other control plane nodes
   include_tasks: kubeadm-secondary.yml
 
 - name: Kubeadm | upgrade kubernetes cluster
@@ -260,7 +260,7 @@
     - kubeadm_already_run.stat.exists
 
 # FIXME(mattymo): from docs: If you don't want to taint your control-plane node, set this field to an empty slice, i.e. `taints: {}` in the YAML file.
-- name: Kubeadm | Remove taint for master with node role
+- name: Kubeadm | Remove taint for control plane node with node role
   command: "{{ kubectl }} taint node {{ inventory_hostname }} {{ item }}"
   delegate_to: "{{ first_kube_control_plane }}"
   with_items:

roles/kubernetes/control-plane/tasks/kubeadm-upgrade.yml

@@ -9,7 +9,7 @@
   delay: 5
   until: _result.status == 200
 
-- name: Kubeadm | Upgrade first master
+- name: Kubeadm | Upgrade first control plane node
   command: >-
     timeout -k 600s 600s
     {{ bin_dir }}/kubeadm
@@ -28,9 +28,9 @@
   failed_when: kubeadm_upgrade.rc != 0 and "field is immutable" not in kubeadm_upgrade.stderr
   environment:
     PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}"
-  notify: Master | restart kubelet
+  notify: Control plane | restart kubelet
 
-- name: Kubeadm | Upgrade other masters
+- name: Kubeadm | Upgrade other control plane nodes
   command: >-
     timeout -k 600s 600s
     {{ bin_dir }}/kubeadm
@@ -49,7 +49,7 @@
   failed_when: kubeadm_upgrade.rc != 0 and "field is immutable" not in kubeadm_upgrade.stderr
   environment:
     PATH: "{{ bin_dir }}:{{ ansible_env.PATH }}"
-  notify: Master | restart kubelet
+  notify: Control plane | restart kubelet
 
 - name: Kubeadm | Remove binding to anonymous user
   command: "{{ kubectl }} -n kube-public delete rolebinding kubeadm:bootstrap-signer-clusterinfo --ignore-not-found"

roles/kubernetes/control-plane/tasks/kubelet-fix-client-cert-rotation.yml

@@ -6,7 +6,7 @@
     line: '    client-certificate: /var/lib/kubelet/pki/kubelet-client-current.pem'
     backup: true
   notify:
-    - "Master | reload kubelet"
+    - "Control plane | reload kubelet"
 
 - name: Fixup kubelet client cert rotation 2/2
   lineinfile:
@@ -15,4 +15,4 @@
     line: '    client-key: /var/lib/kubelet/pki/kubelet-client-current.pem'
     backup: true
   notify:
-    - "Master | reload kubelet"
+    - "Control plane | reload kubelet"

roles/kubernetes/control-plane/tasks/pre-upgrade.yml

@@ -1,5 +1,5 @@
 ---
-- name: "Pre-upgrade | Delete master manifests if etcd secrets changed"
+- name: "Pre-upgrade | Delete control plane manifests if etcd secrets changed"
   file:
     path: "/etc/kubernetes/manifests/{{ item }}.manifest"
     state: absent
@@ -8,14 +8,14 @@
   register: kube_apiserver_manifest_replaced
   when: etcd_secret_changed | default(false)
 
-- name: "Pre-upgrade | Delete master containers forcefully"  # noqa no-handler
+- name: "Pre-upgrade | Delete control plane containers forcefully"  # noqa no-handler
   shell: "set -o pipefail && docker ps -af name=k8s_{{ item }}* -q | xargs --no-run-if-empty docker rm -f"
   args:
     executable: /bin/bash
   with_items:
     - ["kube-apiserver", "kube-controller-manager", "kube-scheduler"]
   when: kube_apiserver_manifest_replaced.changed
-  register: remove_master_container
+  register: remove_control_plane_container
   retries: 10
-  until: remove_master_container.rc == 0
+  until: remove_control_plane_container.rc == 0
   delay: 1