This is a replacement issue for the outdated, inactive previous issue: #2400.

Enhancement Description

• One-line enhancement description (can be used as a release note): Kubernetes nodes support swap memory.
• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/2400-node-swap
• Discussion Link: https://docs.google.com/document/d/1CZtRtC8W8FwW_VWQLKP9DW_2H-hcLBcH9KBbukie67M/edit# Kubelet/Kubernetes should work with Swap Enabled kubernetes#53533
• Primary contact (assignee): @iholder101
• Responsible SIGs: Node
• Enhancement target (which target equals to which milestone):
  • Alpha release target (x.y): 1.22
  • Beta release target (x.y): 1.28
  • Stable release target (x.y):
• Alpha
  • KEP (k/enhancements) update PR(s): Node system swap support #2602
  • Code (k/k) update PR(s):
    • CI/test infra changes: Setup new node image with swap enabled test-infra#22602 Add swap periodics for node test-infra#22809
    • CRI and kubelet changes Alpha node swap support kubernetes#102823
  • Docs (k/website) update PR(s): KEP-2400: Alpha node support for swap memory website#28838
• Beta1
  • KEP (k/enhancements) update PR(s):
    • KEP-2400: Update swap KEP for 1.23 beta #2858
    • KEP-2400: Graduate swap to Beta 1 #3957
  • Issues and Code (k/k) update PR(s):
    • Support cgroups v2 with auto-calculated LimitedSwap for Burstable QoS pods
      • [KEP-2400] Enable Swap Support for Cgroup v2 Only kubernetes#119427
      • [KEP-2400] Enable auto-calculated LimitedSwap for Burstable QoS pods kubernetes#119428
      • [KEP-2400] Add full cgroup v2 swap support with automatically calculated swap limit for LimitedSwap and Burstable QoS Pods kubernetes#118764
    • Add Swap stats to /stats/summary and /metrics/resource
      • [KEP-2400] Add swap memory to the Kubelet stats API kubernetes#119425
      • [KEP-2400] Add swap to stats to Summary API and Prometheus endpoints (/stats/summary and /metrics/resource) kubernetes#118865
    • Determine a set of metrics for measuring node performance with swap enabled
      • [KEP-2400] Determine a set of metrics for measuring node performance with swap enabled kubernetes#119424
      • [KEP-2400] Add swap to stats to Summary API and Prometheus endpoints (/stats/summary and /metrics/resource) kubernetes#118865
      • Add a metric for machine swap capacity google/cadvisor#3339
    • Improve test coverage and make sure tests are green
      • [KEP-2400] Swap: improve test coverage and make sure tests are green kubernetes#119430
      • [KEP-2400] Add full cgroup v2 swap support with automatically calculated swap limit for LimitedSwap and Burstable QoS Pods kubernetes#118764
  • Docs (k/website) update(s):
    • Swap graduates to Beta1: add a blog-post website#42009
    • Swap graduates to Beta1: add documentation and update feature gates website#42167
  • Misc
    • Bugfix: MachineInfo Clone() to also clone "SwapCapacity" google/cadvisor#3293
    • Bump cadvisor version to v0.47.3 kubernetes#119225
  • Archive / Outdated
• Beta2
• Future (related PRs, can be assigned to a specific track later)
  • Add the ability to set a system-reserved quantity of swap on a node
    • [KEP-2400] Add the ability to set a system-reserved quantity of swap on a node kubernetes#105019
    • add --system-reserved support for swap(cgroup v2 only): only for burstable pods kubernetes#105271
  • Fail Kubelet at startup if swap is configured with cgroup v1 kubernetes#119327

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

/sig node