Traditional security practices of firewall-based network segmentation are no longer dependable in this new frontier. Traditional firewalls are minimized by the scale and elasticity of cloud infrastructure, virtual private cloud networks, and cloud-native applications. As more companies shift their software to a microservices-based architecture and orchestrate their containerized applications in Kubernetes, distributed security controls become a must. In cloud environments, the threat and risk model should account for internal-born threats already present inside one of the running components.”]
Source: https://www.darkreading.com/cloud/how-to-secure-your-kubernetes-deployments