2 ipv6 only compatiblility

.github/workflows/ci.yml

@@ -4,7 +4,7 @@ name: CI
   pull_request:
   push:
     branches:
-      - master
+      - '*'
   schedule:
     - cron: "0 4 * * 3"
 

.gitignore

@@ -1,5 +1,6 @@
 *.retry
 */__pycache__
 *.pyc
+.ansible
 .cache
 

README.md

@@ -27,8 +27,8 @@ kubernetes_packages:
 Kubernetes packages to be installed on the server. You can either provide a list of package names, or set `name` and `state` to have more control over whether the package is `present`, `absent`, `latest`, etc.
 
 ```yaml
-kubernetes_version: '1.32'
-kubernetes_version_rhel_package: '1.32'
+kubernetes_version: '1.33'
+kubernetes_version_rhel_package: '1.33'
 ```
 
 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.
@@ -213,6 +213,280 @@ Playbook:
     - geerlingguy.kubernetes
 ```
 
+### IPv6 only two or more nodes (single control-plane) cluster using containerd
+
+Download default config file for flannel from https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml and store it in files/kube-flannel-config.yaml next to ansible scripts.
+
+Update net-conf.json in property:
+
+```yaml
+---
+kind: Namespace
+apiVersion: v1
+metadata:
+  name: kube-flannel
+  labels:
+    k8s-app: flannel
+    pod-security.kubernetes.io/enforce: privileged
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  labels:
+    k8s-app: flannel
+  name: flannel
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - pods
+  verbs:
+  - get
+- apiGroups:
+  - ""
+  resources:
+  - nodes
+  verbs:
+  - get
+  - list
+  - watch
+- apiGroups:
+  - ""
+  resources:
+  - nodes/status
+  verbs:
+  - patch
+---
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  labels:
+    k8s-app: flannel
+  name: flannel
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: flannel
+subjects:
+- kind: ServiceAccount
+  name: flannel
+  namespace: kube-flannel
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  labels:
+    k8s-app: flannel
+  name: flannel
+  namespace: kube-flannel
+---
+kind: ConfigMap
+apiVersion: v1
+metadata:
+  name: kube-flannel-cfg
+  namespace: kube-flannel
+  labels:
+    tier: node
+    k8s-app: flannel
+    app: flannel
+data:
+  cni-conf.json: |
+    {
+      "name": "cbr0",
+      "cniVersion": "0.3.1",
+      "plugins": [
+        {
+          "type": "flannel",
+          "delegate": {
+            "hairpinMode": true,
+            "isDefaultGateway": true
+          }
+        },
+        {
+          "type": "portmap",
+          "capabilities": {
+            "portMappings": true
+          }
+        }
+      ]
+    }
+  net-conf.json: |
+    {
+      "EnableIPv4": false,
+      "EnableIPv6": true,
+      "IPv6Network": "fd76:cac2:6150::/56",
+      "IPv6Subnet": "fd76:cac2:6150::1/64",
+      "EnableNFTables": false,
+      "Backend": {
+        "Type": "vxlan"
+      }
+    }
+---
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: kube-flannel-ds
+  namespace: kube-flannel
+  labels:
+    tier: node
+    app: flannel
+    k8s-app: flannel
+spec:
+  selector:
+    matchLabels:
+      app: flannel
+  template:
+    metadata:
+      labels:
+        tier: node
+        app: flannel
+    spec:
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+            - matchExpressions:
+              - key: kubernetes.io/os
+                operator: In
+                values:
+                - linux
+      hostNetwork: true
+      priorityClassName: system-node-critical
+      tolerations:
+      - operator: Exists
+        effect: NoSchedule
+      serviceAccountName: flannel
+      initContainers:
+      - name: install-cni-plugin
+        image: ghcr.io/flannel-io/flannel-cni-plugin:v1.7.1-flannel1
+        command:
+        - cp
+        args:
+        - -f
+        - /flannel
+        - /opt/cni/bin/flannel
+        volumeMounts:
+        - name: cni-plugin
+          mountPath: /opt/cni/bin
+      - name: install-cni
+        image: ghcr.io/flannel-io/flannel:v0.27.0
+        command:
+        - cp
+        args:
+        - -f
+        - /etc/kube-flannel/cni-conf.json
+        - /etc/cni/net.d/10-flannel.conflist
+        volumeMounts:
+        - name: cni
+          mountPath: /etc/cni/net.d
+        - name: flannel-cfg
+          mountPath: /etc/kube-flannel/
+      containers:
+      - name: kube-flannel
+        image: ghcr.io/flannel-io/flannel:v0.27.0
+        command:
+        - /opt/bin/flanneld
+        args:
+        - --ip-masq
+        - --kube-subnet-mgr
+        resources:
+          requests:
+            cpu: "100m"
+            memory: "50Mi"
+        securityContext:
+          privileged: false
+          capabilities:
+            add: ["NET_ADMIN", "NET_RAW"]
+        env:
+        - name: POD_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.name
+        - name: POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+        - name: EVENT_QUEUE_DEPTH
+          value: "5000"
+        - name: CONT_WHEN_CACHE_NOT_READY
+          value: "false"
+        volumeMounts:
+        - name: run
+          mountPath: /run/flannel
+        - name: flannel-cfg
+          mountPath: /etc/kube-flannel/
+        - name: xtables-lock
+          mountPath: /run/xtables.lock
+      volumes:
+      - name: run
+        hostPath:
+          path: /run/flannel
+      - name: cni-plugin
+        hostPath:
+          path: /opt/cni/bin
+      - name: cni
+        hostPath:
+          path: /etc/cni/net.d
+      - name: flannel-cfg
+        configMap:
+          name: kube-flannel-cfg
+      - name: xtables-lock
+        hostPath:
+          path: /run/xtables.lock
+          type: FileOrCreate
+```
+
+Control plane inventory vars:
+
+```yaml
+kubernetes_role: "control_plane"
+```
+
+Node(s) inventory vars:
+
+```yaml
+kubernetes_role: "node"
+```
+
+Playbook:
+
+```yaml
+
+- hosts: all
+
+  vars:
+    kubernetes_flannel_manifest_file: '/etc/kubernetes/kube-flannel-config.yaml'
+
+  tasks:
+    - name: Create the directory for the kubernetes_config_file
+      ansible.builtin.file:
+        path: "{{ kubernetes_flannel_manifest_file | dirname }}"
+        state: directory
+
+    - name: Copy 'kube-flannel-config.yaml'
+      ansible.builtin.copy:
+        src: files/kube-flannel-config.yaml
+        dest: "{{ kubernetes_flannel_manifest_file }}"
+        owner: root
+        group: root
+        mode: u+rw
+
+- hosts: all
+
+  vars:
+    containerd_config_cgroup_driver_systemd: true
+    kubernetes_allow_pods_on_control_plane: true
+    kubernetes_flannel_manifest_file: '/etc/kubernetes/kube-flannel-config.yaml'
+    kubernetes_pod_network:
+      cni: 'flannel'
+      cidr: 'fd76:cac2:6150::/56'
+      serviceCidr: 'fd76:cac2:6150:1::/112'
+
+  roles:
+    - geerlingguy.containerd
+    - geerlingguy.kubernetes
+```
+
 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

@@ -24,9 +24,11 @@ kubernetes_pod_network:
   # Flannel CNI.
   cni: 'flannel'
   cidr: '10.244.0.0/16'
+  serviceCidr: '10.96.0.0/12'
   # Calico CNI.
   # cni: 'calico'
   # cidr: '192.168.0.0/16'
+  # serviceCidr: '10.96.0.0/12'
 
 kubernetes_kubeadm_kubelet_config_file_path: '/etc/kubernetes/kubeadm-kubelet-config.yaml'
 
@@ -39,7 +41,7 @@ kubernetes_config_kubelet_configuration:
 
 kubernetes_config_init_configuration:
   localAPIEndpoint:
-    advertiseAddress: "{{ kubernetes_apiserver_advertise_address | default(ansible_default_ipv4.address, true) }}"
+    advertiseAddress: "{{ kubernetes_apiserver_advertise_address | default(ansible_default_ipv4.address, true) | default(ansible_default_ipv6.address, true) }}"
 # if you use the next lines, remove the command line argument below
 # nodeRegistration:
 #    ignorePreflightErrors:
@@ -48,6 +50,7 @@ kubernetes_config_init_configuration:
 kubernetes_config_cluster_configuration:
   networking:
     podSubnet: "{{ kubernetes_pod_network.cidr }}"
+    serviceSubnet: "{{ kubernetes_pod_network.serviceCidr }}"
   kubernetesVersion: "{{ kubernetes_version_kubeadm }}"
 
 kubernetes_config_kube_proxy_configuration: {}

molecule/default/calico.yml

@@ -7,6 +7,7 @@
     kubernetes_pod_network:
       cni: 'calico'
       cidr: '192.168.0.0/16'
+      serviceCidr: '10.96.0.0/12'
 
     # Allow swap in test environments (hard to control in some envs).
     kubernetes_config_kubelet_configuration:

tasks/main.yml

@@ -47,7 +47,18 @@
     kubernetes_join_command: >
       {{ kubernetes_join_command_result.stdout }}
       {{ kubernetes_join_command_extra_opts }}
-  when: kubernetes_join_command_result.stdout is defined
+  when: (kubernetes_join_command_result.stdout is defined) and (kubernetes_ignore_preflight_errors is not defined)
+  delegate_to: "{{ item }}"
+  delegate_facts: true
+  with_items: "{{ groups['all'] }}"
+
+- name: Set the kubeadm join command with ignore preflight errors globally.
+  set_fact:
+    kubernetes_join_command: >
+      {{ kubernetes_join_command_result.stdout }}
+      --ignore-preflight-errors={{ kubernetes_ignore_preflight_errors }}
+      {{ kubernetes_join_command_extra_opts }}
+  when: (kubernetes_join_command_result.stdout is defined) and (kubernetes_ignore_preflight_errors is defined)
   delegate_to: "{{ item }}"
   delegate_facts: true
   with_items: "{{ groups['all'] }}"

tasks/sysctl-setup.yml

@@ -7,6 +7,15 @@
     ansible_distribution != 'Debian'
     or ansible_distribution_major_version | int < 10
 
+- name: Activate forwarding
+  sysctl:
+    name: "{{ item }}"
+    value: '1'
+    state: present
+  loop:
+    - net.ipv4.ip_forward
+    - net.ipv6.conf.all.forwarding
+
 - name: Ensure module br_netfilter is loaded
   modprobe:
     name: br_netfilter