add kubeadm-vpcless flavor

docs/src/SUMMARY.md

@@ -11,6 +11,7 @@
       - [ClusterClass kubeadm](./topics/flavors/clusterclass-kubeadm.md)
       - [k3s](./topics/flavors/k3s.md)
       - [rke2](./topics/flavors/rke2.md)
+      - [vpcless (kubeadm)](./topics/flavors/vpcless.md)
     - [Etcd](./topics/etcd.md)
     - [Backups](./topics/backups.md)
     - [Multi-Tenancy](./topics/multi-tenancy.md)

docs/src/topics/flavors/vpcless.md

@@ -0,0 +1,28 @@
+# VPCLess
+
+This flavor supports provisioning k8s clusters outside of VPC. It uses kubeadm for
+setting up control plane and uses cilium with VXLAN for pod networking.
+
+## Specification
+| Control Plane | CNI    | Default OS   | Installs ClusterClass | IPv4 | IPv6 |
+|---------------|--------|--------------|-----------------------|------|------|
+| Kubeadm       | Cilium | Ubuntu 22.04 | No                    | Yes  | No   |
+## Prerequisites
+[Quickstart](../getting-started.md) completed
+
+## Notes
+This flavor is identical to the default flavor with the exception that it provisions
+k8s clusters without VPC. Since it runs outside of VPC, native routing is not
+supported in this flavor and it uses VXLAN for pod to pod communication.
+
+## Usage
+1. Generate cluster yaml
+    ```bash
+    clusterctl generate cluster test-cluster \
+        --infrastructure linode:0.0.0 \
+        --flavor vpcless > test-cluster.yaml
+    ```
+2. Apply cluster yaml
+    ```bash
+    kubectl apply -f test-cluster.yaml
+    ```

templates/addons/cilium/cilium-vxlan.yaml

@@ -0,0 +1,27 @@
+apiVersion: addons.cluster.x-k8s.io/v1alpha1
+kind: HelmChartProxy
+metadata:
+  name: cilium-vxlan
+spec:
+  clusterSelector:
+    matchLabels:
+      cni: cilium
+      vxlan: "true"
+  repoURL: https://helm.cilium.io/
+  chartName: cilium
+  namespace: kube-system
+  version: ${CILIUM_VERSION:=1.15.0}
+  options:
+    waitForJobs: true
+    wait: true
+    timeout: 5m
+  valuesTemplate: |
+    ipam:
+      mode: kubernetes
+    k8s:
+      requireIPv4PodCIDR: true
+    hubble:
+      relay:
+        enabled: true
+      ui:
+        enabled: true

templates/addons/cilium/cilium.yaml

@@ -6,6 +6,7 @@ spec:
   clusterSelector:
     matchExpressions:
       - {key: ipv6, operator: DoesNotExist}
+      - {key: vxlan, operator: DoesNotExist}
       - {key: cni, operator: In, values: ['cilium']}
   repoURL: https://helm.cilium.io/
   chartName: cilium

templates/addons/cilium/kustomization.yaml

@@ -3,3 +3,4 @@ kind: Kustomization
 resources:
     - cilium.yaml
     - cilium-ipv6.yaml
+    - cilium-vxlan.yaml

templates/addons/provider-linode/kustomization.yaml

@@ -2,3 +2,4 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
     - linode-ccm.yaml
+    - linode-ccm-vpcless.yaml

templates/addons/provider-linode/linode-ccm-vpcless.yaml

@@ -0,0 +1,22 @@
+apiVersion: addons.cluster.x-k8s.io/v1alpha1
+kind: HelmChartProxy
+metadata:
+  name: linode-cloud-controller-manager-vpcless
+spec:
+  clusterSelector:
+    matchLabels:
+      ccm: linode
+      vpcless: "true"
+  repoURL: https://linode.github.io/linode-cloud-controller-manager/
+  chartName: ccm-linode
+  namespace: kube-system
+  version: ${LINODE_CCM_VERSION:=v0.4.3}
+  options:
+    waitForJobs: true
+    wait: true
+    timeout: 5m
+  valuesTemplate: |
+    secretRef:
+      name: "linode-token-region"
+    image:
+      pullPolicy: IfNotPresent

templates/addons/provider-linode/linode-ccm.yaml

@@ -4,8 +4,9 @@ metadata:
   name: linode-cloud-controller-manager
 spec:
   clusterSelector:
-    matchLabels:
-      ccm: linode
+    matchExpressions:
+      - {key: vpcless, operator: DoesNotExist}
+      - {key: ccm, operator: In, values: ['linode']}
   repoURL: https://linode.github.io/linode-cloud-controller-manager/
   chartName: ccm-linode
   namespace: kube-system

templates/common-init-files/secret.yaml

@@ -41,5 +41,7 @@ stringData:
     sysctl --system
     sed -i '/swap/d' /etc/fstab
     swapoff -a
-    IPADDR=$(ip a s eth1 |grep 'inet ' |cut -d' ' -f6|cut -d/ -f1)
-    sed -i "s/kubeletExtraArgs:/kubeletExtraArgs:\n    node-ip: $IPADDR/g" /run/kubeadm/kubeadm.yaml
+    if [ -d "/sys/class/net/eth1" ]; then
+        IPADDR=$(ip a s eth1 |grep 'inet ' |cut -d' ' -f6|cut -d/ -f1)
+        sed -i "s/kubeletExtraArgs:/kubeletExtraArgs:\n    node-ip: $IPADDR/g" /run/kubeadm/kubeadm.yaml
+    fi

templates/flavors/vpcless/deleteLinodeVPC.yaml

@@ -0,0 +1,5 @@
+$patch: delete
+apiVersion: infrastructure.cluster.x-k8s.io/v1alpha1
+kind: LinodeVPC
+metadata:
+  name: ${VPC_NAME:=${CLUSTER_NAME}}

templates/flavors/vpcless/kustomization.yaml

@@ -0,0 +1,37 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../default
+
+patches:
+  - path: deleteLinodeVPC.yaml
+  - target:
+      group: infrastructure.cluster.x-k8s.io
+      version: v1alpha1
+      kind: LinodeCluster
+    patch: |-
+      - op: remove
+        path: /spec/vpcRef
+  - target:
+      group: controlplane.cluster.x-k8s.io
+      version: v1beta1
+      kind: KubeadmControlPlane
+    patch: |-
+      - op: remove
+        path: /spec/kubeadmConfigSpec/initConfiguration/skipPhases
+  - target:
+      group: cluster.x-k8s.io
+      version: v1beta1
+      kind: Cluster
+    patch: |-
+      apiVersion: cluster.x-k8s.io/v1beta1
+      kind: Cluster
+      metadata:
+        name: ${CLUSTER_NAME}
+        labels:
+            cni: cilium
+            vxlan: "true"
+            ccm: linode
+            vpcless: "true"
+            csi: linode
+            crs: ${CLUSTER_NAME}-crs