kubectl patch using yaml - no error, but no change [closed] - kubectl

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I like the readability of yaml, therefore I am trying this(no json) - do you know why this runs without error, but do not update/change anything?
kubectl patch configmap/config-domain -n knative-serving --type merge -p '
data:
example.com:""
'
And this is working, but I have no idea why:
kubectl patch configmap/config-network -n knative-serving --type merge -p '
data:
autoTLS: Enabled
httpProtocol: Redirected
'

Answer 1

Here is a sample cm with two keys key1 and key2, the output format is yaml:
k get cm my-config -o yaml
apiVersion: v1
data:
key1: config1
key2: config2
kind: ConfigMap
metadata:
creationTimestamp: "2021-06-22T14:15:07Z"
managedFields:
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:data:
.: {}
f:key1: {}
f:key2: {}
manager: kubectl-create
operation: Update
time: "2021-06-22T14:15:07Z"
name: my-config
namespace: default
resourceVersion: "755842"
selfLink: /api/v1/namespaces/default/configmaps/my-config
uid: 18d87151-ae27-4aa1-8cf1-eee609c0dd7f
Patching the cm:
k patch cm my-config -p $'data:\n key1: "new_config1"'
configmap/my-config patched
Here is the updated cm:
k get cm my-config -o yaml
apiVersion: v1
data:
key1: new_config1 #<----------this is updated
key2: config2
kind: ConfigMap
metadata:
creationTimestamp: "2021-06-22T14:15:07Z"
managedFields:
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:data:
.: {}
f:key2: {}
manager: kubectl-create
operation: Update
time: "2021-06-22T14:15:07Z"
- apiVersion: v1
fieldsType: FieldsV1
fieldsV1:
f:data:
f:key1: {}
manager: kubectl-patch
operation: Update
time: "2021-06-22T14:16:11Z"
name: my-config
namespace: default
resourceVersion: "755928"
selfLink: /api/v1/namespaces/default/configmaps/my-config
uid: 18d87151-ae27-4aa1-8cf1-eee609c0dd7f
Similarly, you can o/p the cm in json, you can built the query after printing the cm in json format.