Handle overlapping ingress paths - nginx

Question

I have one ingress which handles all requests to my-domain.example.com/api and forwards them to backend-service/api:
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: default-backend
spec:
ingressClassName: nginx
rules:
- host: my-domain.example.com
http:
paths:
- path: /api
pathType: Prefix
backend:
service:
name: backend-service
port:
number: 8080
Now I added this second ingress, which should only handle the sub-path my-domain.example.com/api/log and forward it to logger-service/api:
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: logger
annotations:
ingress.kubernetes.io/rewrite-target: /log/$2
spec:
ingressClassName: nginx
rules:
- host: my-domain.example.com
http:
paths:
- path: /api/log(/|$)(.*)
pathType: Prefix
backend:
service:
name: logger-service
port:
number: 8080
But this doesn't work reliable. The log of the ingress controller tells me, that the request to my-domain.example.com/api/log was forwarded to the backend-service. I guess the overlapping paths make it unpredictable.
How do I have to configure my ingresses if I have one service which should handle all defaults (/api/) and some other services which should handle specific sub-paths (/api/log)?

Answer 1

Each path in an Ingress is required to have a corresponding path type. Paths that do not include an explicit pathType will fail validation.
The only supported wildcard character for the path field of an Ingress is the * character. The * character must follow a forward slash (/) and must be the last character in the pattern. For example, /, /foo/, and /foo/bar/* are valid patterns, but , /foo/bar, and /foo//bar are not.A more specific pattern takes precedence over a less specific pattern. If you have both /foo/ and /foo/bar/, then /foo/bar/bat is taken to match /foo/bar/.For more information about path limitations and pattern matching, see the URL Maps documentation.
Suggestion : For second ingress try by mentioning the path as /api/log .*
As shown below
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
annotations:
ingress.kubernetes.io/rewrite-target: /
name: logger
spec:
ingressClassName: nginx
rules:
-
host: my-domain.example.com
http:
paths:
-
backend:
service:
name: logger-service
port:
number: 8080
path: /api/log*
pathType: Prefix
Above YAML is working, find below Screenshot :
Additional reference doc :
Link1
Link2