Hujiang Technology

Jun 29, 2017 · Operations

Understanding DNS Resolver Caching Issues in Salt-Minion and glibc res_init() Behavior

The article explains how salt‑minion’s DNS resolution can become stale after a data‑center migration because each Linux process caches resolver settings in a private _res structure initialized by glibc’s res_init(), and it offers practical ways to force a refresh or redesign the lookup mechanism.