Maintaining and Changing Zones
As time passes you will need to make changes to your zones. Some of these changes will be mundane and no special attention is needed when they are made. Other changes, such as moving a much used service might need special attention to make the change known quickly to all your users.
How SOA Record Controls DNS
As explained in Chapter 1, "DNS Concepts," and Chapter 2, "DNS in Practice," the SOA record controls how fast updated zones propagate from the master to the slave servers and how long RRs are cached in caching servers before they are flushed. Both of these affect your ability to make instant changes in the zones you maintain.
I will consider two scenarios: moving a Web server and moving a DNS server. How ...
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