Merge pull request #34276 from freehan/cri-runtime-config

Automatic merge from submit-queue

add UpdateRuntimeConfig interface

Expose UpdateRuntimeConfig interface in RuntimeService for kubelet to pass a set of configurations to runtime. Currently it only takes PodCIDR.

The use case is for kubelet to pass configs to runtime. Kubelet holds some config/information which runtime does not have, such as PodCIDR. I expect some of kubelet configurations will gradually move to runtime, but I believe cases like PodCIDR, which dynamically assigned by k8s master, need to stay for a while.

pkg/kubelet/api/v1alpha1/runtime/api.proto

@@ -40,6 +40,9 @@ service RuntimeService {
 
     // Exec executes the command in the container.
     rpc Exec(stream ExecRequest) returns (stream ExecResponse) {}
+
+    // UpdateRuntimeConfig updates the runtime configuration based on request
+    rpc UpdateRuntimeConfig(UpdateRuntimeConfigRequest) returns (UpdateRuntimeConfigResponse) {}
 }
 
 // Image service defines the public APIs for managing images
@@ -677,3 +680,18 @@ message RemoveImageRequest {
 }
 
 message RemoveImageResponse {}
+
+message NetworkConfig {
+    // The CIDR to use for pod IP addresses
+    optional string pod_cidr = 1;
+}
+
+message RuntimeConfig {
+    optional NetworkConfig network_config = 1;
+}
+
+message UpdateRuntimeConfigRequest {
+    optional RuntimeConfig runtime_config = 1;
+}
+
+message UpdateRuntimeConfigResponse {}