Answer
Stale DNS caches break lookups; apps need low TTLs.
Quick Answer
Docker's overlay network uses VXLAN tunnels with a key-value store (e.g., etcd) tracking container IPs. After frequent container restarts (IP churn), stale VXLAN FDB entries can persist briefly. A new container gets an old IP, and DNS resolves to the old entry before propagation — causing brief DNS lookup failures.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ