rhel6缓存dns配置小结

安装bind软件包：

yum install bind bind-utils bind-chroot

编辑配置文件：

tips

1. 配置文件的所属组必须为named

2. 如果只是简单的配置缓存dns，最好注掉绿色部分，没注掉时当forwarders指向我自己配置的dns服务器或者8.8.8.8时总是无法解析（指向202.96.209.133又可以解析），不太明白

3. service named restart后，注意坚持/var/log/message看看有没有报错

4. 测试时注意修改/etc/resolv.conf的nameserver地址

vim /etc/named.conf

//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

options {
    listen-on port 53 { any; };
    #listen-on-v6 port 53 { ::1; };
    directory     "/var/named";
    dump-file     "/var/named/data/cache_dump.db";
        statistics-file "/var/named/data/named_stats.txt";
        memstatistics-file "/var/named/data/named_mem_stats.txt";
    allow-query     { any; };
    forward only;
    forwarders { 192.168.17.253; };
    #forwarders { 202.96.209.133; };

    recursion yes;

#    dnssec-enable yes;
#    dnssec-validation yes;
#    dnssec-lookaside auto;

    /* Path to ISC DLV key */
#    bindkeys-file "/etc/named.iscdlv.key";
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

zone "." IN {
    type hint;
    file "named.ca";
};

include "/etc/named.rfc1912.zones";

REF：http://linux.vbird.org/linux_server/0350dns.php