Kubectl update field

# Partially update a node using strategic merge patch
kubectl patch node k8s-node-1 -p '{"spec":{"unschedulable":true}}'

# Partially update a node identified by the type and name specified in "node.json" using strategic merge patch
kubectl patch -f node.json -p '{"spec":{"unschedulable":true}}'

# Update a container's image; spec.containers[*].name is required because it's a merge key
kubectl patch pod valid-pod -p '{"spec":{"containers":[{"name":"kubernetes-serve-hostname","image":"new image"}]}}'

# Update a container's image using a json patch with positional arrays
kubectl patch pod valid-pod -type='json' -p='[{"op": "replace", "path": "/spec/containers/0/image", "value":"new image"}]'

Source: jamesdefabia.github.io

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