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@XiaoningDing XiaoningDing released this 31 Aug 23:48
· 223 commits to master since this release
v0.5
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Summary

This release contains new core features, scalability improvement and lots of stabilization improvements.

Some highlights include:

  • New core features such as etcd partitioning, multi-tenancy controllers & CRD, in-place vertical scaling of both container and VM, multi networking, etc.
  • Verified scalability improvement of 300K pods and 10K nodes.
  • Stabilization, improved build&test infrastructure and more test coverage.

The detailed enhancements are listed below.

Key Features and Improvements

Unified VM/Container:

  • Add features of in-place container vertical scaling.
  • Add the initial implementation of in-place VM vertical scaling, based on vcpu and memory hotplug.
  • Bump to new libvirt version in Arktos VM runtime.
  • Enable standalone deployment of Arktos VM runtime for edge scenarios.
  • Use same cgroup hierarchy for container pods and VM pods.
  • Refactor and simplify the runtime manager code in kubelet.

Multi Tenancy:

  • Add the new feature of per-tenant CRD. Each tenant can install their own CRDs without impacting each other.
  • Add the new feature of tenant-shared CRD. Tenants can share a CRD installed in system space.
  • Add support of tenant.All in client-go.
  • Add support of patch and more other commands for "--tenant" option in kubelet.
  • Update most commonly-used controllers to tenancy-aware controllers, in addition to controllers that have already been updated before:
    • Job controller
    • Volume controller, include corresponding changes in scheduler and kubelet
    • StatefulSet controller
    • Service controller
    • Resource quota controller
    • Daemonset controller
    • Cronjob controller
  • Update Tenant controller to:
    • Initialize default tenant role and role binding during tenant creation.
    • Initialize default network object during tenant creation.
    • Support tenant deletion.
  • Stabilization and various bug fixes.

Multi-Tenancy Networking:

  • Add the new CRD object "Network".
  • Initial support of per-network service IP allocation.
  • Add pod network annotations and check readiness in kubelet.
  • Initial implementation of flat network controller, with flannel network provider.

Scalability:

  • Verified support of 300K pods with 10k nodes within performance constraint.
  • Support multiple etcd clusters to shard cluster data.
  • Bump to latest etcd version and customized it for multi-etcd partitioning.
  • Stabilization and enhancement of multiple API Server partitioning.
  • Stabilization and enhancement of multiple controller partitioning.
  • Add test infrastructure support for AWS.
  • Improved build and test infrastructure.
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