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[release-4.16] Enable swap on the node #924

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praveenkumar wants to merge 1 commit into crc-org:release-4.16 from praveenkumar:swap_release_4.16

Commits on Jun 25, 2024

Enable swap on the node

After switching to OVN-K we observed increase in memory resource and one
way to tackle it to have swap enabled on the node.

This PR is try to do following.
- Enable only `NodeSwap` feature gate instead complete Tech preview
  features.
     - https://docs.openshift.com/container-platform/4.15/rest_api/config_apis/featuregate-config-openshift-io-v1.html
- Add `swapaccount=1` to kernel argument which is required for the swap
    - https://docs.openshift.com/container-platform/4.15/nodes/nodes/nodes-nodes-managing.html#nodes-nodes-swap-memory_nodes-nodes-managing
- Add swap feature to kubelet config
- Add systemd unit file to create swap and enable it
- Extend the disk size by 4GB because that much of space used for swap

praveenkumar committed Jun 25, 2024