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Shim

Runtime Class Manager operates on Shim custom resources based on the Shim CRD.

Whenever a Shim is created, updated or deleted, Runtime-Class-Manager will perform the necessary actions, e.g. creating, updating or removing the associated RuntimeClass, installing or removing shim binaries on any Nodes labeled with a corresponding to its nodeSelector, etc.

Configuration

For full, detailed configuration options, see the Shim CRD. Here we point out a few pertinent items.

  • spec.nodeSelector: The label key and value applied to Nodes where this particular shim should be installed
  • spec.fetchStrategy: The strategy for fetching the shim binary
    • spec.fetchStrategy.anonHttp: Fetch the shim binary from a specified URL. This is the legacy option.
    • spec.fetchStrategy.platforms: A list of per-OS/architecture artifact entries. Each entry specifies os, arch, location, and an optional sha256 digest. The controller selects the matching entry for each target node. This is the current recommended strategy.
  • spec.containerdRuntimeOptions: Options specific to the shim that should be added to the containerd configuration

Operation

You may observe the "install" and "uninstall" Jobs responsible for downloading and installing (or uninstalling) the shim binary. These will run on every Node that matches the Shim's nodeSelector.