Merge pull request #62242 from feiskyer/pod-cidr

Automatic merge from submit-queue (batch tested with PRs 63314, 63884, 63799, 63521, 62242). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Check CIDR before updating node status

**What this PR does / why we need it**:

Check CIDR before updating node status.  See #62164.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #62164

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

pkg/kubelet/apis/cri/runtime/v1alpha2/api.proto

@@ -1047,7 +1047,8 @@ message RemoveImageRequest {
 message RemoveImageResponse {}
 
 message NetworkConfig {
-    // CIDR to use for pod IP addresses.
+    // CIDR to use for pod IP addresses. If the CIDR is empty, runtimes
+    // should omit it.
     string pod_cidr = 1;
 }
 

pkg/kubelet/kubelet_node_status.go

@@ -384,7 +384,9 @@ func (kl *Kubelet) tryUpdateNodeStatus(tryNumber int) error {
 		return fmt.Errorf("nil %q node object", kl.nodeName)
 	}
 
-	kl.updatePodCIDR(node.Spec.PodCIDR)
+	if node.Spec.PodCIDR != "" {
+		kl.updatePodCIDR(node.Spec.PodCIDR)
+	}
 
 	kl.setNodeStatus(node)
 	// Patch the current status on the API server