Move Kubernetes cluster bootstrap partially to Ansible

ansible-kubernetes.yml

@@ -0,0 +1,63 @@
+---
+- name: Pin kube components
+  hosts: kubernetes
+  tasks:
+    - name: Pin packages
+      loop:
+        - kubeadm
+        - kubectl
+        - kubelet
+      ansible.builtin.copy:
+        dest: "/etc/apt/preferences.d/{{ item }}"
+        content: |
+          Package: {{ item }}
+          Pin: version 1.26.*
+          Pin-Priority: 1001
+
+- name: Reset /etc/containers/registries.conf
+  hosts: kubernetes
+  tasks:
+  - name: Copy /etc/containers/registries.conf
+    ansible.builtin.copy:
+      content: "unqualified-search-registries = [\"docker.io\"]\n"
+      dest: /etc/containers/registries.conf
+    register: registries
+  - name: Restart CRI-O
+    service:
+      name: cri-o
+      state: restarted
+    when: registries.changed
+
+- name: Reset /etc/modules
+  hosts: kubernetes
+  tasks:
+  - name: Copy /etc/modules
+    ansible.builtin.copy:
+      content: |
+        overlay
+        br_netfilter
+      dest: /etc/modules
+    register: kernel_modules
+  - name: Load kernel modules
+    ansible.builtin.shell: "cat /etc/modules | xargs -L 1 -t modprobe"
+    when: kernel_modules.changed
+
+- name: Reset /etc/sysctl.d/99-k8s.conf
+  hosts: kubernetes
+  tasks:
+  - name: Copy /etc/sysctl.d/99-k8s.conf
+    ansible.builtin.copy:
+      content: |
+        cat > /etc/sysctl.d/99-k8s.conf << EOF
+        net.ipv4.conf.all.accept_redirects  = 0
+        net.bridge.bridge-nf-call-iptables  = 1
+        net.ipv4.ip_forward                 = 1
+        net.bridge.bridge-nf-call-ip6tables = 1
+        vm.max_map_count                    = 524288
+        fs.inotify.max_user_instances       = 1280
+        fs.inotify.max_user_watches         = 655360
+      dest: /etc/sysctl.d/99-k8s.conf
+    register: sysctl
+  - name: Reload sysctl config
+    ansible.builtin.shell: "sysctl --system"
+    when: sysctl.changed