Configure query base routing in AWS ALB ingress controller

AWS Application Load Balancer provides user with the ability to do advanced request routing using query parameter.

New - Advanced Request Routing for AWS Application Load Balancers | Amazon Web Services

However, it’s not explicitly mentioned how to do it with K8S ingress annotation in ALB ingress controller documentation. I found a Github issue discussing about advanced routing rules, but the information doesn’t include the configuration for query based routing.

After several search and tests, I was able to achieve query based routing through the following configuration. Basically two ALB ingress controller annotations were used:
alb.ingress.kubernetes.io/actions: used to control the behavior of traffic
alb.ingress.kubernetes.io/conditions: used to specify the routing rule

P.S. I am using EKS v1.20 with ALB ingress controller v2.3.1.

The above config would create an ALB with two routing paths as following:
query string path:nginx1 -> nginx-path1 k8s service
query string path:nginx2 -> nginx-path2 k8s service

That’s all. Feel free to share your thoughts or questions in the comment.