WIP Add automated tests for kubelet LimitedSwap drop-in configuration for CNV

test/extended/testdata/node/cnv-swap/README.md

@@ -0,0 +1,101 @@
+# CNV Swap Configuration Test Data
+
+This directory contains YAML and configuration files used by the CNV swap tests (`node_swap_cnv.go`).
+
+## Files
+
+### CNV Operator Installation
+
+- `cnv-namespace.yaml` - Namespace for CNV operator (openshift-cnv)
+- `cnv-operatorgroup.yaml` - OperatorGroup for CNV
+- `cnv-subscription.yaml` - Subscription to install CNV operator from OperatorHub
+- `cnv-hyperconverged.yaml` - HyperConverged CR to deploy CNV components
+
+### Kubelet Drop-in Configurations
+
+- `kubelet-limitedswap-dropin.yaml` - Kubelet config with LimitedSwap enabled
+- `kubelet-noswap-dropin.yaml` - Kubelet config with NoSwap (default)
+- `kubelet-malformed-dropin.yaml` - Intentionally malformed config for error testing
+
+### MachineConfig Resources
+
+- `machineconfig-swap-dropin-dir.yaml` - Creates the drop-in directory on workers
+- `machineconfig-limitedswap.yaml` - Full MachineConfig with LimitedSwap configuration
+
+## Drop-in Directory Paths
+
+- CNV uses: `/etc/openshift/kubelet.conf.d/`
+- Drop-in file: `99-kubelet-limited-swap.conf`
+
+## Usage
+
+### Manual CNV Installation
+
+```bash
+# Create namespace
+oc apply -f cnv-namespace.yaml
+
+# Create operator group
+oc apply -f cnv-operatorgroup.yaml
+
+# Subscribe to CNV operator
+oc apply -f cnv-subscription.yaml
+
+# Wait for operator to install
+oc get csv -n openshift-cnv -w
+
+# Create HyperConverged CR
+oc apply -f cnv-hyperconverged.yaml
+
+# Wait for CNV to be ready
+oc get hyperconverged -n openshift-cnv -w
+```
+
+### Enable LimitedSwap via MachineConfig
+
+```bash
+# Apply MachineConfig (nodes will reboot)
+oc apply -f machineconfig-limitedswap.yaml
+
+# Monitor rollout
+watch oc get mcp
+```
+
+### Manual Drop-in Configuration
+
+```bash
+# Debug into a node
+oc debug node/<node-name>
+
+# Create drop-in file
+chroot /host
+mkdir -p /etc/openshift/kubelet.conf.d
+cat > /etc/openshift/kubelet.conf.d/99-kubelet-limited-swap.conf << 'EOF'
+apiVersion: kubelet.config.k8s.io/v1beta1
+kind: KubeletConfiguration
+memorySwap:
+  swapBehavior: LimitedSwap
+EOF
+
+# Restart kubelet
+systemctl restart kubelet
+```
+
+## Test Cases
+
+The configuration files support testing:
+
+- TC1: Drop-in directory creation and ownership
+- TC2: Drop-in directory behavior on non-CNV nodes
+- TC3: LimitedSwap configuration application
+- TC4-TC5: swapBehavior value validation
+- TC6: Configuration file priority (precedence)
+- TC7: Kubelet restart with drop-in
+- TC8: Drop-in file removal handling
+- TC9: Drop-in directory permissions
+- TC10: Malformed YAML handling
+- TC11-TC13: Swap usage validation
+- TC14: Multiple drop-in files
+- TC15: Kubelet logs for swap configuration
+- TC16: Swap status persistence across restarts
+- TC17: Various swap sizes

test/extended/testdata/node/cnv-swap/cnv-hyperconverged.yaml

@@ -0,0 +1,9 @@
+apiVersion: hco.kubevirt.io/v1beta1
+kind: HyperConverged
+metadata:
+  name: kubevirt-hyperconverged
+  namespace: openshift-cnv
+spec:
+  BareMetalPlatform: true
+  infra: {}
+  workloads: {}

test/extended/testdata/node/cnv-swap/cnv-namespace.yaml

@@ -0,0 +1,6 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: openshift-cnv
+  labels:
+    openshift.io/cluster-monitoring: "true"

test/extended/testdata/node/cnv-swap/cnv-operatorgroup.yaml

@@ -0,0 +1,8 @@
+apiVersion: operators.coreos.com/v1
+kind: OperatorGroup
+metadata:
+  name: kubevirt-hyperconverged-group
+  namespace: openshift-cnv
+spec:
+  targetNamespaces:
+  - openshift-cnv

test/extended/testdata/node/cnv-swap/cnv-subscription.yaml

@@ -0,0 +1,13 @@
+apiVersion: operators.coreos.com/v1alpha1
+kind: Subscription
+metadata:
+  name: hco-operatorhub
+  namespace: openshift-cnv
+spec:
+  source: redhat-operators
+  sourceNamespace: openshift-marketplace
+  name: kubevirt-hyperconverged
+  channel: "stable"
+  installPlanApproval: Automatic
+  # Uncomment to pin to a specific version:
+  # startingCSV: kubevirt-hyperconverged-operator.v4.17.0

test/extended/testdata/node/cnv-swap/kubelet-limitedswap-dropin.yaml

@@ -0,0 +1,6 @@
+# Kubelet drop-in configuration for LimitedSwap
+# Place this file at: /etc/openshift/kubelet.conf.d/99-kubelet-limited-swap.conf
+apiVersion: kubelet.config.k8s.io/v1beta1
+kind: KubeletConfiguration
+memorySwap:
+  swapBehavior: LimitedSwap

test/extended/testdata/node/cnv-swap/kubelet-malformed-dropin.yaml

@@ -0,0 +1,7 @@
+# Malformed kubelet drop-in configuration for testing error handling
+# This file has intentional syntax errors
+apiVersion: kubelet.config.k8s.io/v1beta1
+kind: KubeletConfiguration
+memorySwap
+  swapBehavior LimitedSwap
+invalid_field: true

test/extended/testdata/node/cnv-swap/kubelet-noswap-dropin.yaml

@@ -0,0 +1,6 @@
+# Kubelet drop-in configuration for NoSwap (default behavior)
+# Place this file at: /etc/openshift/kubelet.conf.d/99-kubelet-no-swap.conf
+apiVersion: kubelet.config.k8s.io/v1beta1
+kind: KubeletConfiguration
+memorySwap:
+  swapBehavior: NoSwap

test/extended/testdata/node/cnv-swap/machineconfig-limitedswap.yaml

@@ -0,0 +1,24 @@
+# MachineConfig to enable LimitedSwap on worker nodes via drop-in file
+# Base64 encoded content of kubelet-limitedswap-dropin.yaml
+apiVersion: machineconfiguration.openshift.io/v1
+kind: MachineConfig
+metadata:
+  labels:
+    machineconfiguration.openshift.io/role: worker
+  name: 99-cnv-kubelet-limited-swap
+spec:
+  config:
+    ignition:
+      version: 3.2.0
+    storage:
+      directories:
+      - path: /etc/openshift/kubelet.conf.d
+        mode: 0755
+        overwrite: true
+      files:
+      - path: /etc/openshift/kubelet.conf.d/99-kubelet-limited-swap.conf
+        mode: 0644
+        overwrite: true
+        contents:
+          # Base64 encoded: apiVersion: kubelet.config.k8s.io/v1beta1\nkind: KubeletConfiguration\nmemorySwap:\n  swapBehavior: LimitedSwap\n
+          source: data:text/plain;charset=utf-8;base64,YXBpVmVyc2lvbjoga3ViZWxldC5jb25maWcuazhzLmlvL3YxYmV0YTEKa2luZDogS3ViZWxldENvbmZpZ3VyYXRpb24KbWVtb3J5U3dhcDoKICBzd2FwQmVoYXZpb3I6IExpbWl0ZWRTd2FwCg==

test/extended/testdata/node/cnv-swap/machineconfig-swap-dropin-dir.yaml

@@ -0,0 +1,16 @@
+# MachineConfig to create the kubelet drop-in directory on worker nodes
+apiVersion: machineconfiguration.openshift.io/v1
+kind: MachineConfig
+metadata:
+  labels:
+    machineconfiguration.openshift.io/role: worker
+  name: 99-cnv-kubelet-swap-dropin-dir
+spec:
+  config:
+    ignition:
+      version: 3.2.0
+    storage:
+      directories:
+      - path: /etc/openshift/kubelet.conf.d
+        mode: 0755
+        overwrite: true