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Domain Name Server (DNS) used for name resolving to any hosts.Master DNS servers (Primary Server) are the original zone data handlers and Slave DNS server (Secondary Server) are just a backup servers which is used to copy the same zone information’s from the master servers.In this way, DNS alleviates the need to remember IP addresses. Ubuntu ships with BIND (Berkley Internet Naming Daemon), the most widely deployed DNS server.In this configuration BIND9 will find the answer to name queries and remember the answer for the next query. By caching DNS queries, you will reduce bandwidth and (more importantly) latency.With the combination of caching software solutions (sssd, nscd, cached zone files, ttl’s, etc), it can make debugging more difficult.In order to view the raw binary content, it must be converted to text first: It’s an added layer of complexity, but if you need the microscopic performance boost, that’s the way to go.Reason: Administrator could not configure a slave DNS server as it cannot function properly unless SOA serial number is changed every time a DNS record is changed.
After, some rearch I came across the documentation and while it suggests other IP’s can be used when the transfer-source fails.In short add following two directives to your options or server section: // Slave server ns2.options ; logging ; /* KEYS for master server dnssec */ key "TRANSFER" ; server ; /* Get rndc key */ include "/etc/rndc.key"; /* Get localhost and other rfc stuff */ include "/etc/named.rfc1912.zones"; /* Get root server */ include "/etc/hints"; /* Get our zones */ include "/etc/zones.local"; The author is the creator of nix Craft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting.He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. A secondary master DNS server is used to complement a primary master DNS server by serving a copy of the zone(s) configured on the primary server.Secondary servers are recommended in larger setups.
Feature: Automatically increase SOA serial number when a DNS zone managed by Identity Management any record in the zone is updated.