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DOKS nodes inherit their sizing and capacity properties from ther node pool, and you cannot change node pool settings after creation.
To increase the amount of resources your nodes have, you need to create a new node pool of the desired size. After you have created the new node pool and it displays a ‘Ready’ status, delete the older smaller node pool. This causes the workloads on the old node pool to get rescheduled on the new larger nodes.