How do I set up a Kubernetes Ingress rule with a regex path?
Apparently this question is still getting traffic, so I feel like I should update it. I'm no longer using the nginx ingress, so I can't verify this works. According to https://kubernetes.github.io/ingress-nginx/user-guide/ingress-path-matching/:
The ingress controller supports case insensitive regular expressions in the
spec.rules.http.paths.path
field. This can be enabled by setting thenginx.ingress.kubernetes.io/use-regex
annotation totrue
(the default is false).
The example they provide on the page would cover it:
apiVersion: extensions/v1beta1kind: Ingressmetadata: name: test-ingress-3 annotations: nginx.ingress.kubernetes.io/use-regex: "true"spec: rules: - host: test.com http: paths: - path: /foo/bar/bar backend: serviceName: test servicePort: 80 - path: /foo/bar/[A-Z0-9]{3} backend: serviceName: test servicePort: 80
Original answer that no longer works.
It appears that the solution is ridiculously simple (at least with an nginx ingress controller) - you just need to prepend the path with "~ "
:
apiVersion: extensions/v1beta1kind: Ingressmetadata: name: cafe-ingressspec: tls: - hosts: - cafe.example.com secretName: cafe-secret rules: - host: cafe.example.com http: paths: - path: ~ /t[a-z]a backend: serviceName: tea-svc servicePort: 80 - path: /coffee backend: serviceName: coffee-svc servicePort: 80
I don't think there is an option to use regexp in Ingress objects. Ingress is designed to work with multiple IngressController implementations, both provided by cloud services or by self-hosted ingress like nginx one from kubernetes/contrib (which I use on my setup). Thus ingress should cover features that are commonly available on most common implementations, while specific, non-standard behaviours can be set using annotations (like ie. many nginx ingress features).