Cluster DNS

Cluster DNS enables Omnia to provide dynamic hostname resolution for compute, Slurm, login, and Kubernetes nodes using CoreDNS-based DNS services instead of static /etc/hosts file management. This architecture eliminates O(N) SSH-based hosts file updates during provisioning and provides automatic hostname resolution for newly inventoried nodes.

• Cluster DNS Overview
  • What is Cluster DNS
  • DNS Ownership Boundaries
  • DNS Architecture
  • High Availability Behavior
  • Fabric-Aware Resolution
  • Interaction with admin_network.dns
  • Interaction with Kubernetes CoreDNS
  • Operational Expectations
  • Common Failure Scenarios
  • Limitations
  • Use Cases
• Configuring Cluster DNS
  • Prerequisites
  • Enabling Cluster DNS
  • Disabling Cluster DNS (Reverting to /etc/hosts)
  • Configuration Parameters
  • Verification
  • Troubleshooting
  • Best Practices
  • Migration from /etc/hosts to DNS
  • Rollback from DNS to /etc/hosts

For parameter reference, see ../../Tables/provision_config.

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