How DNS Works in Linux. Part 2: All Levels of DNS Caching
This video provides a detailed guide to multi-tiered DNS caching in a Linux environment, explaining the underlying cache mechanisms from the network core to application software.
The author examines the operation of system services such as systemd-resolved and nscd, as well as the specifics of request processing in Java, Go, and Python. Particular attention is paid to networking tools, including Docker, Kubernetes, and Nginx and HAProxy proxy servers, where cache settings directly impact service availability. The video includes practical recommendations for diagnosing latency issues using dig and tcpdump, as well as methods for forcibly clearing cached data. Finally, strategies for managing the TTL parameter are offered to minimize issues during infrastructure upgrades and effectively monitor system performance.
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