What feature must a CNI support to control specific traffic flows for workloads running in Kubernetes?
What feature must a CNI support to control specific traffic flows for workloads running in Kubernetes?
To control specific traffic flows for workloads running in Kubernetes, a Container Network Interface (CNI) must support Network Policies. Network Policies allow administrators to define rules that restrict the ingress and egress traffic to and from pods, ensuring that only authorized communication occurs between those pods. This is crucial for maintaining security and managing network traffic within the Kubernetes cluster.
Think of Network Policies in Kubernetes as security checkpoints at different entrances to a building. Just as security personnel at each entrance check IDs and verify permissions before allowing individuals to enter specific areas of the building, Network Policies control the flow of network traffic within the Kubernetes cluster, ensuring that only authorized Pods can communicate with each other and that access to sensitive services is restricted according to defined rules.
https://kubernetes.io/docs/concepts/services-networking/network-policies/#:~:text=Network%20Policies-,Network%20Policies,might%20consider%20using%20Kubernetes%20NetworkPolicies%20for%20particular%20applications%20in%20your%20cluster.,-NetworkPolicies%20are%20an