Multiline string annotations for terraform kubernetes provider - yaml

Question

I would like to set up Ambassador as an API Gateway for kubernetes using terraform. There are several ways how to configure Ambassador. The recommended way, according to documentation, is by using kubernetes annotations for each service that is routed and exposed outside the cluster. This is done easily using kubernetes yaml configuration:
kind: Service
apiVersion: v1
metadata:
name: my-service
annotations:
getambassador.io/config: |
---
apiVersion: ambassador/v0
kind: Mapping
name: my_service_mapping
prefix: /my-service/
service: my-service
spec:
selector:
app: MyApp
ports:
- protocol: TCP
port: 80
targetPort: 9376
The getambassador.io/config field's value starting with | suggest it is a multiline string value. How to achieve the same thing using terraform HCL?

Answer 1

Terraform documentation contains a section about multiline strings using <<EOF your multiline string EOF:
resource "kubernetes_service" "my-service" {
"metadata" {
name = "my-service"
annotations {
"getambassador.io/config" = <<EOF
apiVersion: ambassador/v0
kind: Mapping
name: my_service_mapping
prefix: /my-service/
service: my-service
EOF
}
}
"spec" {
selector {
app = "MyApp"
}
port {
protocol = "TCP"
port = 80
target_port = "9376"
}
}
}
Make sure there is no triple dash (---) from yaml configuration. Terraform parses it incorrectly.