Azure Kubernetes Service (AKS) reset SSH key of azureuser account on nodes

update_aks_node_key.sh

#!/usr/bin/env bash

##
# Update the SSH key for the azureuser account on the specified AKS node.
#
cluster_resource_group="${1:-}"
node="${2:-}"
public_key_path="${3:-}"

AZURE_USER="azureuser"

if [[ -z "${cluster_resource_group}" || -z "${node}" || -z "${public_key_path}" ]]; then
  {
    echo "Usage: ${0} <cluster resource group> <node name> <public key path>"
    echo ""
  } >&2
  
  exit 1
fi

az vm user update \
    --resource-group "${cluster_resource_group}" \
    --name "${node}" \
    --username "${AZURE_USER}" \
    --ssh-key-value "${public_key_path}"