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Update How to set up a primary DNS server using CentOS.md

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joeren 2014-05-19 11:45:01 +08:00
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How to set up a primary DNS server using CentOS
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Any operational domain has at least two DNS servers, one being called a primary name server (ns1), and the other a secondary name server (ns2). These servers are typically operated for DNS failover: If one server goes down, the other server becomes an active DNS server. More sophisticated failover mechanisms involving load balancers, firewalls and clusters are also possible.