Docker containers lose DNS resolution after host reboot due to stale resolv.conf
A long-time Docker user on Debian reports that after a host reboot, containers start successfully but cannot reach the internet because they fail to pick up the host resolv.conf; restarting the containers a few minutes later fixes it. This points to a startup-ordering race between Docker and the host DNS/networking services that surfaces only after a reboot, not during normal operation.
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