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Node resources

On startup, vk-cocoon probes the host for real CPU, memory, hugepages, and disk capacity and registers them as the virtual node's Capacity and Allocatable in the Kubernetes API. This replaces hardcoded defaults with values the scheduler can trust.

  • Capacity = raw host resources (runtime.NumCPU, /proc/meminfo MemTotal, statfs total, and hugepages-<size> where the page size is read from /proc/meminfo so a 1Gi-default node is advertised under the right key).
  • Allocatable = Capacity minus a reserve fraction (default 20%, override via VK_RESERVE_PERCENT).
  • Storage allocatable uses statfs available bytes (Bavail) instead of total — base images, existing COW overlays, and snapshots are naturally excluded from the budget.
  • Values are read once at startup and do not update while vk-cocoon is running; a restart refreshes them (idempotent).
  • Individual resources can be force-overridden via VK_NODE_CPU, VK_NODE_MEM, VK_NODE_STORAGE, VK_NODE_HUGEPAGES, VK_NODE_PODS (see Configuration).