DNS policies play a critical role in managing and securing workload communication for cloud-native applications running on Kubernetes clusters. Two popular options for implementing DNS policies are Calico and Cilium. While both have their merits, Calico’s approach offers several distinct advantages over Cilium’s, particularly in terms of flexibility, scalability, and overall operational simplicity.

As companies build more cloud-native apps, securing them across different infrastructures becomes a challenge. Cloud-native apps leveraging different deployment environments such as on-premises, public cloud, or hybrid have different security challenges as they are scaling, interoperable, and cost-effective.