node Local DNS cache

[sunguroku]

Location

• [ ] Browser
• [ ] CLI
• [ ] API
• [x] Infrastructure

Requirements

In the event of severe request spikes or heavy loads on node.js, dns resolution through coredns fails/is too slow because node.js does not have a caching layer. The onus of dns cache falls on the infrastructure, and coredns does not implement this. A caching layer is necessary in each node to prevent downtimes and slowdown. Problem better detailed here: https://tech.findmypast.com/k8s-dns-lookup/

Users should have the option to use local dns cache that's deployed as a Daemonset (esp in the case of node servers) per https://kubernetes.io/docs/tasks/administer-cluster/nodelocaldns/. Ideally should be default or an option during cluster provisioning process.

Additional Details

requires slightly different config between EKS and GKE