How to patch configmap in json file with kustomize? - kubernetes

Question

How to patch "db.password" in the following cm with kustomize?
comfigmap:
apiVersion: v1
data:
dbp.conf: |-
{
"db_properties": {
"db.driver": "com.mysql.jdbc.Driver",
"db.password": "123456",
"db.user": "root"
}
}
kind: ConfigMap
metadata:
labels: {}
name: dbcm

Answer 1

you can create new file with updated values and use command replace along wih create
kubectl create configmap NAME --from-file file.name -o yaml --dry-run | kubectl replace -f -

Answer 2

create a placeholder in your file and replace it with real data while applying kustomize
your code will be like this:
#!/bin/bash
sed -i "s/PLACE-HOLDER/123456/g" db_config.yaml
kustomize config.yaml >> kustomizeconfig.yaml
kubectl apply -f kustomizeconfig.yaml -n foo
And the db_config file will be:
apiVersion: v1
data:
dbp.conf: |-
{
"db_properties": {
"db.driver": "com.mysql.jdbc.Driver",
"db.password": "PLACE_HODLER",
"db.user": "root"
}
}
kind: ConfigMap
metadata:
labels: {}
name: dbcm
NB: This should be running on the pipeline to have the config file cloned from repo, so the real file won't be updated.