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Encrypted DNS from Boot to Runtime: A Zero Trust Milestone in RHEL

Talkat DevConf.CZ 2025 · 2025-06-12..06-14· [security, linux-and-operating-systems]
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RHEL adds system-wide encrypted DNS that works during installation, early boot and runtime by changing more than 10 components (Anaconda, dracut, OpenSSL, NetworkManager, dnsconfd, Unbound, Bind, FreeIPA, SSSD, Anaconda kickstart hooks, etc.) and shipping a local resolver so applications need no changes. It uses Unbound for DoT forwarding with a local port 53 cache and TLS to upstreams on port 853, accepts kickstart CA certs and kernel args, provides enforce/relaxed policies and plans DoH support.

AI-written summary · about

  1. 0:00Encrypted DNS milestone intro
  2. 2:13DNS traffic privacy importance
  3. 7:12Zero trust architecture needs
  4. 9:03Encrypted DNS in RHEL needs
  5. 10:57System integration challenges
  6. 13:28Encrypted DNS protocols
  7. 15:56NetworkManager for encrypted DNS
  8. 17:19Install encrypted DNS
  9. 19:50IPA server with encrypted DNS
  10. 22:41Deploying IPA encrypted DNS
  11. 25:12Future DNS over HTTPS plans
  12. 27:24Q&A: Failover policies
  13. 30:39Q&A: Local caching options
  14. 33:00Q&A: BIND limitations
  15. 34:27Q&A: NetworkManager experience
  16. 35:31Closing remarks
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