ORACLE RAC DNS服务器搭建与配置详细过程

水深无声 2022-05-31 00:43 202阅读 0赞

ORACLE RAC DNS服务器搭建与配置  
  
一、说明：

之前已经写过关于oracle rac的搭建的详细过程，但是之前搭建的时候没有配置dns域名解析，这次单独把这块配置拿出来讲一下。

这里我们把dns单独安装在一台服务器上，具体过程如下：

/etc/hosts  配置：

[root@rac1 ~]# vi /etc/hosts
    
    127.0.0.1 localhost
    #public
    192.168.1.10 rac1.shiyu.com rac1
    192.168.1.11 rac2.shiyu.com rac2
    
    #private
    192.168.188.120 rac1-priv.shiyu.com rac1-priv
    192.168.188.130 rac2-priv.shiyu.com rac2-priv
    
    #vip
    192.168.1.20 rac1-vip.shiyu.com rac1-vip
    192.168.1.21 rac2-vip.shiyu.com rac2-vip
    
    #scan
    192.168.1.30 rac-scan.shiyu.com rac-scan
    192.168.1.31 rac-scan.shiyu.com rac-scan
    192.168.1.32 rac-scan.shiyu.com rac-scan
    
    
    rac2：
    
    [root@rac2 ~]# vi /etc/hosts

127.0.0.1 localhost
    #public
    192.168.1.10 rac1.shiyu.com rac1
    192.168.1.11 rac2.shiyu.com rac2
    
    #private
    192.168.188.120 rac1-priv.shiyu.com rac1-priv
    192.168.188.130 rac2-priv.shiyu.com rac2-priv
    
    #vip
    192.168.1.20 rac1-vip.shiyu.com rac1-vip
    192.168.1.21 rac2-vip.shiyu.com rac2-vip
    
    #scan
    192.168.1.30 rac-scan.shiyu.com rac-scan
    192.168.1.31 rac-scan.shiyu.com rac-scan
    192.168.1.32 rac-scan.shiyu.com rac-scan

dns服务器：\[root@oracle ~\]\# vi /etc/hosts127.0.0.1 localhost192.168.1.97 oracle二、dns服务器搭建（192.168.1.97）  
  
1.安装dns,这里直接利用yum安装：

[root@oracle ~]# yum install bind
    [root@oracle ~]# yum install bind-chroot
    [root@oracle ~]# yum install caching-nameserver

2.安装完成后，bind的主配置文件是/etc/named.conf；区域类型配置文件是/etc/named.rfc1912.zones；区域配置文件在/var/named/下;  
(1)修改name.conf

[root@oracle ~]# vi /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; };   #默认监听IP是127.0.0.1，any或者注释掉就是允许所有IP
            listen-on-v6 port 53 { any; }; #ip6监听地址
            directory       "/var/named";  #存放区域配置文件的目录
            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; }; #只允许本地主机localhost，any或者注释掉就是允许所有主机查询 
            recursion yes; #是否开启迭代查询功能
    
            dnssec-enable yes;   
            dnssec-validation yes;
    
            /* Path to ISC DLV key */
            bindkeys-file "/etc/named.iscdlv.key";
    
            managed-keys-directory "/var/named/dynamic";
    };
    
    logging {     
            channel default_debug {
                    file "data/named.run";
                    severity dynamic;
            };
    };
    
    zone "." IN {
            type hint;
            file "named.ca";
            //file "/dev/null";
    };
    
    include "/etc/named.rfc1912.zones";
    include "/etc/named.root.key";

(2)配置正反向解析zone  
修改zone 文件：/etc/named.rfc1912.zones, 添加正向解析和反向解析的Zone 定义。

[root@oracle ~]# vi /etc/named.rfc1912.zones
    
    // named.rfc1912.zones:
    //
    // Provided by Red Hat caching-nameserver package
    //
    // ISC BIND named zone configuration for zones recommended by
    // RFC 1912 section 4.1 : localhost TLDs and address zones
    // and http://www.ietf.org/internet-drafts/draft-ietf-dnsop-default-local-zones-02.txt
    // (c)2007 R W Franks
    //
    // See /usr/share/doc/bind*/sample/ for example named configuration files.
    //
    //配置正向解析Zone
    zone "shiyu.com" IN {
            type master;
            file "shiyu.com.zone";
            allow-update { none; };
    };
    //注意，这个域名要和后面配置的一致
    
    //配置反向解析Zone
    zone "1.168.192.in-addr.arpa" IN {
            type master;
            file "1.168.192.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，192.168.1.*网段的反向解析域名为"1.168.192.in-addr.arpa”。

(3)配置正向解析的区域文件  
在之前的name.conf 配置中指定的区域文件目录是：/var/named。 所以在这个目录里创建正向解析的区域文件。  
文件名就是在Zone中定义的file名。  
\[root@oracle ~\]\#touch /var/named/shiyu.com.zone

添加如下内容：

$TTL    86400
    @      IN    SOA  oracle.shiyu.com.  root.shiyu.com. (
                                            42              ; serial (d.adams)
                                             3H              ; refresh
                                            15M             ; retry
                                            1W              ; expiry
                                            1D)            ; minimum
    
               IN     NS       oracle.shiyu.com.
    oracle     IN      A       192.168.1.97
    rac-scan   IN     A       192.168.1.30
    rac-scan   IN     A       192.168.1.31
    rac-scan   IN     A       192.168.1.32
    rac1       IN     A       192.168.1.10
    rac2       IN     A       192.168.1.11

(4)配置反向解析的区域文件  
在/var/named 目录下创建反向解析的区域文件，文件名也是之前在Zone中定义的：1.168.192.local。

添加如下内容：

$TTL    86400
    @               IN SOA  oracle.shiyu.com.      root.shiyu.com. (
                                          1997022700 ; Serial
                                          28800      ; Refresh
                                          14400      ; Retry
                                          3600000    ; Expire
                                          86400)    ; Minimum
    
          IN      NS     oracle.shiyu.com.
    30    IN      PTR    rac-scan.shiyu.com.
    31    IN      PTR    rac-scan.shiyu.com.
    32    IN      PTR    rac-scan.shiyu.com.
    10    IN      PTR    rac1.shiyu.com
    11    IN      PTR    rac2.shiyu.com

3.重启DNS

[root@oracle ~]# chkconfig named on
    [root@oracle ~]# serialver named restart

4.验证DNS  
在所有节点的/etc/resolv.conf 文件中添加如下内容：

[root@rac1 ~]# vi /etc/resolv.conf 
    domain  shiyu.com
    nameserver 192.168.1.97
    options rotate
    options timeout:2
    options attempts:5
    
    [root@rac2 ~]# vi /etc/resolv.conf 
    domain  shiyu.com
    nameserver 192.168.1.97
    options rotate
    options timeout:2
    options attempts:5
    
    [root@rac1 ~]# nslookup rac-scan.shiyu.com
    Server:		192.168.1.97
    Address:	192.168.1.97#53
    
    Name:	rac-scan.shiyu.com
    Address: 192.168.1.32
    Name:	rac-scan.shiyu.com
    Address: 192.168.1.30
    Name:	rac-scan.shiyu.com
    Address: 192.168.1.31
    
    
    [root@rac2 ~]# nslookup rac-scan.shiyu.com
    Server:		192.168.1.97
    Address:	192.168.1.97#53
    
    Name:	rac-scan.shiyu.com
    Address: 192.168.1.31
    Name:	rac-scan.shiyu.com
    Address: 192.168.1.32
    Name:	rac-scan.shiyu.com
    Address: 192.168.1.30

在所有节点都验证成功。那么就可以安装使用DNS的scan的集群了。