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Kubernetes: separate post and get requests from one path to different services

№ 11971 В разделе Sysadmin от April 11th, 2023,
В подшивках: Kubernetes

You have some url to REST API, which processing some DB requests. So you want to separate reading (get) and writing (post) requests because reading is a fast operation using whole DB cluster, and writing may be long and writes only to master DB server. Or just because you have different applications for reading and writing data. This means you have 2 different k8s services with different applications.

In kubernetes you need to create ingress resource with 2 path to 2 services marked as _post and _get, also add rewrite and conditions for every service into annotations.

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/configuration-snippet: |
      internal;
      rewrite ^ $original_uri break;
    nginx.ingress.kubernetes.io/server-snippet: |
      location /api/file {
        if ( $request_method = GET) {
          set $target_destination '/api/file/_get';
        }
        if ( $request_method = POST) {
          set $target_destination '/api/file/_post';
        }
        set $original_uri $uri;
        rewrite ^ $target_destination last;
      }
  name: simple-two-route
  namespace: test
spec:
  ingressClassName: nginx
  rules:
  - host: blindage.org
    http:
      paths:
      - backend:
          service:
            name: service-post
            port:
              number: 80
        path: /api/file/_post
        pathType: Exact
      - backend:
          service:
            name: service-get
            port:
              number: 80
        path: /api/file/_get
        pathType: Exact

You can divide traffic more by adding more conditions and paths.

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