K8S DNS
1. Overview
1.1. Kubernetes (K8S) DNS Overview
- Kubernetes includes a built-in DNS server that correlates with the services within the cluster.
- When a new service is created, the DNS server is notified and can manage DNS records accordingly.
- DNS names follow the format
<service-name>.<namespace>.svc.cluster.local.
- The DNS server helps with service discovery, allowing Kubernetes services to communicate seamlessly.
- CoreDNS is the default DNS solution from version 1.13 onwards, replacing kube-dns.
1.2. Functional Components of K8S DNS
- Service Discovery: Simplifies the process of finding and connecting with services by names rather than IPs.
- Pod DNS Resolution: Each pod can query the DNS system, facilitating interaction with other services.
- ClusterDNS: Configures kubelets to communicate with the DNS server for name resolutions.
- CoreDNS Configuration: Provides flexibility and supports various plugins for handling DNS queries efficiently.
Tags::network:k8s: