OPS535 DNS Review

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Name Resolution on Linux systems

  • control file: /etc/nsswitch.conf

File Based Name Resolution

Flat file name resolution

  • mapping information store in /etc/hosts
  • same contents on each system share the same name space

DNS name resolution

  • use client-server model

DNS Client (Resolver)

  • Configuration file: /etc/resolv.conf - mainly tells the local computer which machines should be used to answer your DNS queries.

DNS Server (BIND)

  • Configuration file: /etc/named.conf - server options and which domains are their resposibility
  • Zone files: location specified in the /etc/named.conf - contains information of the zone(s)
  • Role of server:
    • Cache-only server
    • Primary Server
    • Secondary Server
    • Root name server