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Extend documentation with example for IPv6 only

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Oliver Welter 2025-07-23 14:01:47 +02:00
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@ -213,6 +213,280 @@ Playbook:
- geerlingguy.kubernetes - 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. 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 ## License