How to add kubernates ingress and eggres rules

Question

I am newbie to Kubernetes, and I need to add some rules to the network policy:

• Allow ingress traffic from the list of predefined IP addresses to specific ports.
• Deny ingress traffic from private subnets.
• Allow egress traffic to the Internet.
• Deny egress traffic to private subnets.

I found some documents, but I couldn't find for internet.
And finally, how can I write this policy with Kubernetes java library?

Answer 1

Kubernetes Network Policy is designed to restrict access inside the cluster, limiting access from pods to another pods and services.

• Network Policies
• Declare Network Policy

If you need to restrict access from/to internet, it's better to use cloud provider capabilities or a physical device like:

• routers (Cisco, Juniper)
• load balancer/application delivery controllers(ADC) (f5 BIG-IP, Cisco)
• security appliance (Fortinet, Cisco ASA, Check Point)

To manage Kubernetes from java code you can use official java client library.