September 2001
Intermediate to advanced
352 pages
11h 1m
English
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Running a Slave Name Server
You need to set up another name server for robustness. You can (and probably will) set up more than two name servers. Two servers are the minimum. If you have only one name server and it goes down, no one can look up names in your zone. A second name server splits the load with the first server or handles the whole load if the first server is down. You could set up another primary master name server, but we don’t recommend it. Set up a slave name server instead.
How does a server know if it is a primary master or a slave for a zone? The DNS server configuration information in the Registry tells the server it is a primary master or a slave on a per zone basis. The NS records don’t tell us which server is the primary master for a zone and which servers are slaves for a zone—they only say who the servers are. (Globally, DNS doesn’t care; as far as the actual name resolution goes, slave servers are as good as primary master servers.)
What is different between a primary master name server and a slave name server? The crucial difference is where the server gets its data. A primary master name server reads its data from files. A slave name server loads its data over the network from another name server. This process is called a zone transfer.
A slave name server is not limited to loading zones from a primary master name server; a slave server can load from another slave server. The big advantage of slave name servers is that you maintain only one set of ...
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