Oracle 11g R2 RAC：配置DNS解析SCAN VIP
Oracle 11gR2Grid Infrastructure (CRS) 中引入了 Single Client Access Name (SCAN) 来简化客户端对
数据库服务的访问。
本文将详细介绍如何配置 DNS 来解析 SCAN VIP
演示环境
一、安装 DNS Server
rpm -ivhbind-9.3.6-16.P1.el5.i386.rpm rpm -ivhbind-chroot-9.3.6-16.P1.el5.i386.rpm rpm -ivhcaching-nameserver-9.3.6-16.P1.el5.i386.rpm DNS的守护进程 /usr/sbin/named /usr/sbin/rndc DNS的脚本 /etc/init.d/named DNS的端口 53 953(tcp udp) DNS的配置文件 /var/named/chroot/etc/named.conf(主配置文件) /var/named/chroot/*
二、配置 DNS Server
1、创建主配置文件 named.conf
[root@rac1 Server]#cd /var/named/chroot/etc
[root@rac1 etc]# ls-lt
total 24
-rw-r----- 1 rootnamed 113 Jun 1 07:46 rndc.key
-rw-r----- 1 rootnamed 1230 Jan 14 2011named.caching-nameserver.conf
-rw-r----- 1 rootnamed 955 Jan 14 2011 named.rfc1912.zones
-rw-r--r-- 1 rootroot 3519 Feb 27 2006 localtime
[root@rac1 etc]#more named.caching-nameserver.conf
//
//named.caching-nameserver.conf
//
// Provided by RedHat caching-nameserver package to configure the
// ISC BIND named(8)DNS server as a caching only nameserver
// (as a localhostDNS resolver only).
//
// See/usr/share/doc/bind*/sample/ for example named configuration files.
//
// DONOT EDIT THIS FILE - use system-config-bind or an editor
// tocreate named.conf - edits to this file will be lost on
// caching-nameserver package upgrade.
//
------创建 named.conf 配置文件
[root@rac1 etc]# cp-p named.caching-nameserver.conf named.conf
[root@rac1 etc]# ls-lt
total 28
-rw-r----- 1 rootnamed 113 Jun 1 07:46 rndc.key
-rw-r----- 1 rootnamed 1230 Jan 14 2011named.caching-nameserver.conf
-rw-r----- 1 rootnamed 1230 Jan 14 2011 named.conf
-rw-r----- 1 rootnamed 955 Jan 14 2011 named.rfc1912.zones
-rw-r--r-- 1 rootroot 3519 Feb 27 2006 localtime
-------编辑刚刚创建的 named.conf 文件，按照如下方式修改：
listen-on port 53 { 127.0.0.1; };
allow-query { localhost; };
match-clients { localhost; };
match-destinations { localhost; };
allow-query-cache { localhost; };
将上述entry中的 host 信息全部修改为 any，注意保留源文件中的空格
2、配置正向解析和反向解析 zone
------配置正向解析 zone
[root@rac1 etc]# vinamed.rfc1912.zones
zone"oracle.com" IN {
type master;
file "rac.oracle.zone";
allow-update { none; };
};
------配置反向解析 zone
[root@rac1 etc]# vinamed.rfc1912.zones
zone"8.168.192.in-addr.arpa" IN {
type master;
file "rac.oracle.local";
allow-update { none; };
};
这里需要注意的是，反向解析从左到右读取ip地址时是以相反的方向解释的，所以需要将ip地址反向排列。这里，192.168.8.*网段的反向解析域名为"8.168.192.in-addr.arpa"。
3、利用模板文件创建用于正向解析和反向解析数据库文件
[root@rac1 etc]# cd/var/named/chroot/var/named
[root@rac1 named]#ls -lt
total 44
-rw-r----- 1root named 198 Jan 14 2011 localdomain.zone
-rw-r----- 1root named 195 Jan 14 2011 localhost.zone
-rw-r----- 1root named 427 Jan 14 2011 named.broadcast
-rw-r----- 1root named 1892 Jan 14 2011 named.ca
-rw-r----- 1root named 424 Jan 14 2011 named.ip6.local
-rw-r----- 1root named 426 Jan 14 2011 named.local
-rw-r----- 1root named 427 Jan 14 2011 named.zero
drwxrwx--- 2 namednamed 4096 Aug 26 2004 data
drwxrwx--- 2 namednamed 4096 Jul 27 2004 slaves
-----创建正向解析数据库文件
[root@rac1named]# cp -p localhost.zonerac.oracle.zone
-----创建方向解析数据库文件
[root@rac1named]# cp -p named.localrac.oracle.local
----