Using network namespaces
You can use software-defined networking (SDN) in Red Hat OpenShift Container Platform to give a unified cluster network that enables communication between containers across the cluster.
Network policy mode, by default, makes all pods in a project accessible from other pods and network endpoints. To isolate one or more pods in a project, you can create NetworkPolicy objects in that project to indicate the allowed incoming connections. Using multitenant mode, you can provide project-level isolation for pods and services.