PR #107: Co-authored commit to change master naming to control plane.

Co-authored-by: ra-rau <[email protected]>

README.md

@@ -29,9 +29,9 @@ Kubernetes packages to be installed on the server. You can either provide a list
 
 The minor version of Kubernetes to install. The plain `kubernetes_version` is used to pin an apt package version on Debian, and as the Kubernetes version passed into the `kubeadm init` command (see `kubernetes_version_kubeadm`). The `kubernetes_version_rhel_package` variable must be a specific Kubernetes release, and is used to pin the version on Red Hat / CentOS servers.
 
-    kubernetes_role: master
+    kubernetes_role: control_plane
 
-Whether the particular server will serve as a Kubernetes `master` (default) or `node`. The master will have `kubeadm init` run on it to intialize the entire K8s control plane, while `node`s will have `kubeadm join` run on them to join them to the `master`.
+Whether the particular server will serve as a Kubernetes `control_plane` (default) or `node`. The control plane will have `kubeadm init` run on it to intialize the entire K8s control plane, while `node`s will have `kubeadm join` run on them to join them to the `control_plane`.
 
 ### Variables to configure kubeadm and kubelet with `kubeadm init` through a config file (recommended)
 
@@ -86,9 +86,9 @@ Extra args to pass to the generated `kubeadm join` command during K8s node initi
 
 ### Additional variables
 
-    kubernetes_allow_pods_on_master: true
+    kubernetes_allow_pods_on_control_plane: true
 
-Whether to remove the taint that denies pods from being deployed to the Kubernetes master. If you have a single-node cluster, this should definitely be `True`. Otherwise, set to `False` if you want a dedicated Kubernetes master which doesn't run any other pods.
+Whether to remove the taint that denies pods from being deployed to the Kubernetes control plane. If you have a single-node cluster, this should definitely be `True`. Otherwise, set to `False` if you want a dedicated Kubernetes control plane which doesn't run any other pods.
 
     kubernetes_pod_network:
       # Flannel CNI.
@@ -109,7 +109,7 @@ This role currently supports `flannel` (default), `calico` or `weave` for cluste
     kubernetes_version_kubeadm: 'stable-{{ kubernetes_version }}'
     kubernetes_ignore_preflight_errors: 'all'
 
-Options passed to `kubeadm init` when initializing the Kubernetes master. The `kubernetes_apiserver_advertise_address` defaults to `ansible_default_ipv4.address` if it's left empty.
+Options passed to `kubeadm init` when initializing the Kubernetes control plane. The `kubernetes_apiserver_advertise_address` defaults to `ansible_default_ipv4.address` if it's left empty.
 
     kubernetes_apt_release_channel: main
     kubernetes_apt_repository: "deb http://apt.kubernetes.io/ kubernetes-xenial {{ kubernetes_apt_release_channel }}"
@@ -138,25 +138,25 @@ None.
 
 ## Example Playbooks
 
-### Single node (master-only) cluster
+### Single node (control-plane-only) cluster
 
 ```yaml
 - hosts: all
 
   vars:
-    kubernetes_allow_pods_on_master: true
+    kubernetes_allow_pods_on_control_plane: true
 
   roles:
     - geerlingguy.docker
     - geerlingguy.kubernetes
 ```
 
-### Two or more nodes (single master) cluster
+### Two or more nodes (single control-plane) cluster
 
-Master inventory vars:
+Control plane inventory vars:
 
 ```yaml
-kubernetes_role: "master"
+kubernetes_role: "control_plane"
 ```
 
 Node(s) inventory vars:
@@ -171,14 +171,14 @@ Playbook:
 - hosts: all
 
   vars:
-    kubernetes_allow_pods_on_master: true
+    kubernetes_allow_pods_on_control_plane: true
 
   roles:
     - geerlingguy.docker
     - geerlingguy.kubernetes
 ```
 
-Then, log into the Kubernetes master, and run `kubectl get nodes` as root, and you should see a list of all the servers.
+Then, log into the Kubernetes control plane, and run `kubectl get nodes` as root, and you should see a list of all the servers.
 
 ## License
 

defaults/main.yml

@@ -12,14 +12,14 @@ kubernetes_packages:
 kubernetes_version: '1.25'
 kubernetes_version_rhel_package: '1.25.0'
 
-kubernetes_role: master
+kubernetes_role: control_plane
 
 # This is deprecated. Please use kubernetes_config_kubelet_configuration instead.
 kubernetes_kubelet_extra_args: ""
 
 kubernetes_kubeadm_init_extra_opts: ""
 kubernetes_join_command_extra_opts: ""
-kubernetes_allow_pods_on_master: true
+kubernetes_allow_pods_on_control_plane: true
 kubernetes_pod_network:
   # Flannel CNI.
   cni: 'flannel'

molecule/default/calico.yml

@@ -9,7 +9,11 @@
       cidr: '192.168.0.0/16'
 
     # Allow swap in test environments (hard to control in some envs).
-    kubernetes_kubelet_extra_args: "--fail-swap-on=false --cgroup-driver=systemd"
+    kubernetes_kubelet_extra_args: >-
+      --fail-swap-on=false
+      --cgroup-driver=systemd
+      --cgroups-per-qos=false
+      --enforce-node-allocatable=""
     docker_install_compose: false
 
   pre_tasks:

molecule/default/converge.yml

@@ -5,7 +5,11 @@
 
   vars:
     # Allow swap in test environments (hard to control in some envs).
-    kubernetes_kubelet_extra_args: "--fail-swap-on=false --cgroup-driver=systemd"
+    kubernetes_kubelet_extra_args: >-
+      --fail-swap-on=false
+      --cgroup-driver=systemd
+      --cgroups-per-qos=false
+      --enforce-node-allocatable=""
     docker_install_compose: false
 
   pre_tasks:

molecule/default/molecule.yml

@@ -10,7 +10,7 @@ platforms:
     command: ${MOLECULE_DOCKER_COMMAND:-""}
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
-      - /var/lib/docker
+      - /var/lib/containerd
     privileged: true
     pre_build_image: true
 provisioner:

tasks/master-setup.yml → tasks/control-plane-setup.yml

@@ -9,15 +9,15 @@
     src: "kubeadm-kubelet-config.j2"
     dest: "{{ kubernetes_kubeadm_kubelet_config_file_path }}"
 
-- name: Initialize Kubernetes master with kubeadm init
+- name: Initialize Kubernetes control plane with kubeadm init
   command: >
     kubeadm init
     --config {{ kubernetes_kubeadm_kubelet_config_file_path }}
     {{ kubernetes_kubeadm_init_extra_opts }}
   register: kubeadmin_init
   when: (not kubernetes_init_stat.stat.exists) and (kubernetes_ignore_preflight_errors is not defined)
 
-- name: Initialize Kubernetes master with kubeadm init and ignore_preflight_errors
+- name: Initialize Kubernetes control plane with kubeadm init and ignore_preflight_errors
   command: >
     kubeadm init
     --config {{ kubernetes_kubeadm_kubelet_config_file_path }}
@@ -78,8 +78,8 @@
 
 # TODO: Check if taint exists with something like `kubectl describe nodes`
 # instead of using kubernetes_init_stat.stat.exists check.
-- name: Allow pods on master node (if configured).
-  command: "kubectl taint nodes --all node-role.kubernetes.io/master-"
+- name: Allow pods on control plane (if configured).
+  command: "kubectl taint nodes --all node-role.kubernetes.io/control-plane-"
   when:
-    - kubernetes_allow_pods_on_master | bool
+    - kubernetes_allow_pods_on_control_plane | bool
     - not kubernetes_init_stat.stat.exists

tasks/main.yml

@@ -34,15 +34,15 @@
     path: /etc/kubernetes/admin.conf
   register: kubernetes_init_stat
 
-# Set up master.
-- include_tasks: master-setup.yml
-  when: kubernetes_role == 'master'
+# Set up control plane.
+- include_tasks: control-plane-setup.yml
+  when: kubernetes_role == 'control_plane'
 
 # Set up nodes.
-- name: Get the kubeadm join command from the Kubernetes master.
+- name: Get the kubeadm join command from the Kubernetes control plane.
   command: kubeadm token create --print-join-command
   changed_when: false
-  when: kubernetes_role == 'master'
+  when: kubernetes_role == 'control_plane'
   register: kubernetes_join_command_result
 
 - name: Set the kubeadm join command globally.

tasks/node-setup.yml

@@ -1,5 +1,5 @@
 ---
-- name: Join node to Kubernetes master
+- name: Join node to Kubernetes control plane.
   shell: >
     {{ kubernetes_join_command }}
     creates=/etc/kubernetes/kubelet.conf