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Tham khảo tài liệu 'dns & bind_5', công nghệ thông tin, hệ điều hành phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | DNS BIND There are more options to h2n than we ve shown here. For the complete list of options you ll have to look at the manpage. Of course a few kinds of resource records aren t easy to generate from etc hosts - the necessary data simply aren t there. You may need to add these records manually. But since h2n always rewrites db files won t your changes be overwritten h2n provides a back door for inserting this kind of data. Put these special records in a file named spcl.DOMAIN where DOMAIN is the domain name of your zone. When h2n finds this file it will include it within the database files by adding the line INCLUDE spcl.DOMAIN to the end of the db.DOMAINfile. The INCLUDE directive is described later in this chapter. For example the administrator of movie.edu may add extra MX records into the file spcl.movie so that users can mail to movie.edu directly instead of sending mail to hosts within movie.edu. Upon finding this file h2n would put the line INCLUDE spcl.movie at the end of the database file db.movie. 7.2.6 Keeping db.cache Current As explained in Chapter 4 the db.cache file tells your server where the servers for the root zone are. It must be updated periodically. The root name servers do not change very often but they do change. A good practice is to check your db.cache file every month or two. In Chapter 4 we told you to get the servers by ftping to ftp.rs.intemic.net. And that s probably your best method to keep current. If you have on your system a copy of dig a utility that works a lot like nslookup and is included in the BIND distribution you can retrieve the current list of roots just by running dig @a.root-servers.net . ns db.cache 7.1 BIND Name Server Signals 7.3 Organizing Your Files Library Home DNS BIND TCP IP sendmail sendmail Reference Firewalls Practical Security 7.2.6 Keeping db.cache Current 213 DNS BIND -f DNS and BIND- C SEARCH Chapter 7 Maintaining BIND 7.3 Organizing Your Files When you first set up your domain organizing your files .
