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Network component that resolves domain names to IP addresses, coordinating caching and recursive queries.
A DNS resolver is a network component that translates domain names to IP addresses while coordinating recursive queries, caching and response processing. It affects availability, performance, security and consistency of services and requires choices about caching, ownership and hardening in distributed systems. Typical scenarios range from client stub resolvers to provider resolver clusters.
Share of queries answered from local cache; indicator for efficiency and latency.
Distributed response times to assess performance and SLA compliance.
Proportion of failed resolutions, useful to detect outages or misconfigurations.
CoreDNS is used in Kubernetes as cluster DNS, configurable with plugins for caching and forwarding.
Unbound provides local recursive caching with DNSSEC validation for ISP or enterprise environments.
Public resolvers combine global anycast infrastructure with resolver policies to optimize latency and privacy.
Analyze requirements and SLAs, select resolver type
Design cache policies, TTLs and failover
Roll out with monitoring, security hardening and tests