nginx ingress rate limiting - docker

Question

i am not able to understand one point in the rate-limiting of Nginx ingress
i was referring to one article regarding rate limiting with nginx ingress : https://medium.com/titansoft-engineering/rate-limiting-for-your-kubernetes-applications-with-nginx-ingress-2e32721f7f57#:~:text=When%20we%20use%20NGINX%20ingress,configure%20rate%20limits%20with%20annotations.&text=As%20an%20example%20above%2C%20the,qps)%20on%20the%20Hello%20service.
in limitation section at last
It applies to the whole ingress and is not able to configure
exceptions, eg. when you want to exclude a health check path /healthz
from your service.
if i am creating two ingresses with different names, one has path /hello1 and another /hello2 both pointing to the same service backend.
Now if i am adding rate limiting to only one ingress or path /hello1 will it affect another? if the same host or domain is there ???
ingress 1 : example.com/hello1 - rate-limit set
ingress 2 : example.com/hello2 no rate limiting
Thanks in advance

Answer 1

Rate limit will be applied only to that ingress where you specified it. What is basically nginx-ingress doing in the background - it merges rules into 1 huge config, however they applies to different objects.
e.g 2 different ingresses for same host and diff path.
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: test1
annotations:
kubernetes.io/ingress.class: 'nginx'
nginx.ingress.kubernetes.io/limit-rps: '5'
spec:
rules:
- host: example.com
http:
paths:
- path: /path1
backend:
serviceName: service1
servicePort: 8080
and
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: test2
annotations:
kubernetes.io/ingress.class: 'nginx'
nginx.ingress.kubernetes.io/limit-rps: '10'
spec:
rules:
- host: example.com
http:
paths:
- path: /path2
backend:
serviceName: service1
servicePort: 8080