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Session Persistence

It is often required that the requests from a client are always passed to the same backend container. You can enable such behavior with Session Persistence, available in the NGINX Plus Ingress controller.

NGINX Plus supports the sticky cookie method. With this method, NGINX Plus adds a session cookie to the first response from the backend container, identifying the container that sent the response. When a client issues the next request, it will send the cookie value and NGINX Plus will route the request to the same container.

Syntax

To enable session persistence for one or multiple services, add the nginx.com/sticky-cookie-services annotation to your Ingress resource definition. The annotation specifies services that should have session persistence enabled as well as various attributes of the cookie. The annotation syntax is as follows:

nginx.com/sticky-cookie-services: "service1[;service2;...]"

Here each service follows the following syntactic rule:

serviceName=serviceName cookieName [expires=time] [domain=domain] [httponly] [secure] [path=path]

The syntax of the cookieName, expires, domain, httponly, secure and path parameters is the same as for the sticky directive in the NGINX Plus configuration.

Example

In the following example we enable session persistence for two services -- the tea-svc service and the coffee-svc service:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: cafe-ingress-with-session-persistence
  annotations:
    nginx.com/sticky-cookie-services: "serviceName=coffee-svc srv_id expires=1h path=/coffee;serviceName=tea-svc srv_id expires=2h path=/tea"
spec:
  rules:
  - host: cafe.example.com
    http:
      paths:
      - path: /tea
        backend:
          serviceName: tea-svc
          servicePort: 80
      - path: /coffee
        backend:
          serviceName: coffee-svc
          servicePort: 80

For both services, the sticky cookie has the same srv_id name. However, we specify the different values of expiration time and a path.

Notes

Session persistence works even in the case where you have more than one replicas of the NGINX Plus Ingress controller running.

Advanced Session Persistence

The NGINX Plus Ingress controller supports only one of the three session persistence methods available in NGINX Plus. Visit this page to learn about all of the methods. If your session persistence requirements are more complex than the ones in the example above, you will have to use a different approach to deploying and configuring NGINX Plus without the Ingress controller. You can read the Load Balancing Kubernetes Services with NGINX Plus blog post to find out more.