Comment 15 for bug 1988119

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William Bergmann Børresen (williambb) wrote : Re: Update to systemd 237-3ubuntu10.54 broke dns

To temporary mitigate the ImagePullBackOff I scaled up a new functional node (DNS wise) and used this command to reconcile the AKS cluster:
az resource update --resource-group <RESOURCE_GROUP> --name <CLUSTER_NAME> --namespace Microsoft.ContainerService --resource-type ManagedClusters

This recovered CoreDNS in the kube-system namespace, which fixed the ImagePullBackOff