We (OpenShift Local) team is trying out the swap enablement for the node which is part of Tech preview as per document https://docs.openshift.com/container-platform/4.15/nodes/nodes/nodes-nodes-managing.html#nodes-nodes-swap-memory_nodes-nodes-managing but looks like when we follow those steps it works as expected but as soon as node shutdown (manually) and started again it just fails to consume the swap as it should be.

 - 4.15.3

 - Create a single node openshift cluster and perform following operation to enable the swap partition.

$ oc edit featuregates <= update the spec with following to enable swapgate
  spec:
    customNoUpgrade:
      enabled:
      - NodeSwap
      - BuildCSIVolumes
    featureSet: CustomNoUpgrade

$ cat <<EOF | oc apply -f -
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: master
  name: 99-kernel-swapcount-arg
spec:
  config:
  ignition:
    version: 3.4.0
  kernelArguments:
    - swapaccount=1
EOF

$ cat <<EOF | oc apply -f -
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
  labels:
    machineconfiguration.openshift.io/role: master
  name: 99-openshift-machineconfig-master-swap-service
spec:
  config:
    ignition:
      version: 3.4.0
    systemd:
      units:
      - contents: |
          [Unit]
          Description=Create 4GB swap partition
          Before=var-crc-swapfile1.swap
          
          [Service]
          Type=oneshot
          RemainAfterExit=yes
          ExecStart=/usr/bin/mkdir -p /var/crc
          ExecStart=/usr/bin/fallocate -l 4096m /var/crc/swapfile1
          ExecStart=/usr/bin/chmod 600 /var/crc/swapfile1
          ExecStart=/usr/sbin/mkswap /var/crc/swapfile1
          
          [Install]
          WantedBy=multi-user.target
        enabled: true
        name: swap-partition.service
      - contents: |
          [Unit]
          Description=Turn on the swap
          
          [Swap]
          What=/var/crc/swapfile1
          
          [Install]
          WantedBy=multi-user.target
        enabled: true
        name: var-crc-swapfile1.swap
EOF
$ cat <<EOF | oc apply -f -
apiVersion: machineconfiguration.openshift.io/v1
kind: KubeletConfig
metadata:
  name: swap-config
spec:
  machineConfigPoolSelector:
    matchLabels:
      pools.operator.machineconfiguration.openshift.io/master: ""
  kubeletConfig:
    failSwapOn: false 
    memorySwap:
      swapBehavior: LimitedSwap
EOF


Wait till all the operator come back again.

 After restart swap is not consumed as it was before.

  Restart shouldn't effect how swap is consumed

    I am going to add the must gather log for just after day-2 operation and then after the reboot one.

Node description (just after day-2 operation)
```
$ oc describe node 
---
Allocated resources:
  (Total limits may be over 100 percent, i.e., overcommitted.)
  Resource           Requests       Limits
  --------           --------       ------
  cpu                2161m (56%)    0 (0%)
  memory             9111Mi (107%)  0 (0%)   <= You can see it is overcommited
  ephemeral-storage  0 (0%)         0 (0%)
  hugepages-1Gi      0 (0%)         0 (0%)
  hugepages-2Mi      0 (0%)         0 (0%)
```

Node description (just after reboot)
```
$ oc describe node
Allocated resources:
  (Total limits may be over 100 percent, i.e., overcommitted.)
  Resource           Requests      Limits
  --------           --------      ------
  cpu                2091m (55%)   0 (0%)
  memory             8451Mi (99%)  0 (0%) <= not overcommited and it stay same
  ephemeral-storage  0 (0%)        0 (0%)
  hugepages-1Gi      0 (0%)        0 (0%)
  hugepages-2Mi      0 (0%)        0 (0%)
```