做动画的动作库网站,企业网站推广的重要性,上海公司网站建设多少钱,红河学院网站建设Oracle 11g RAC 集群中引入了SCAN(Single Client Access Name)的概念#xff0c;也就是指集群的单客户端访问名称。SCAN 这个特性为客户端提供了单一的主机名#xff0c;用于访问集群中运行的 Oracle 数据库。如果您在集群中添加或删除节点#xff0c;使用 SCAN 的客户端无需…Oracle 11g RAC 集群中引入了SCAN(Single Client Access Name)的概念也就是指集群的单客户端访问名称。SCAN 这个特性为客户端提供了单一的主机名用于访问集群中运行的 Oracle 数据库。如果您在集群中添加或删除节点使用 SCAN 的客户端无需更改自己的 TNS 配置。无论集群包含哪些节点SCAN 资源及其关联的 IP 地址提供了一个稳定的名称供客户端进行连接使用。在Oracle 11g grid 安装时即要求为该特性配置DNS解析方式或GNS解析方式。本文描述了安装Oracle 11g grid时的DNS配置。 [python] view plaincopy print? 1、安装环境 #配置DNS可以使用单独的DNS服务器也可以直接使用RAC的一个节点来提供DNS解析 #直接使用某个节点时容易出现该节点如果宕机将导致SCAN无法解析客户端无法连接数据库 #本文仅作演示使用节点1的public ip用作dns不考虑上面描述的情形以及DNS安全性等。 [rootnode1 ~]# cat /etc/issue Enterprise Linux Enterprise Linux Server release 5.5 (Carthage) Kernel \r on an \m 2、主机节点host信息 [rootnode1 ~]# more /etc/hosts # Do not remove the following line, or various programs # that require network functionality will fail. #127.0.0.1 localhost.localdomain localhost #::1 localhost6.localdomain6 localhost6 127.0.0.1 localhost.szdb.com localhost # Public eth0 192.168.7.71 node1.szdb.com node1 #该地址作为DNS服务器地址 192.168.7.72 node2.szdb.com node2 #Private eth1 10.10.7.71 node1-priv.szdb.com node1-priv 10.10.7.72 node2-priv.szdb.com node2-priv #Virtual 192.168.7.81 node1-vip.szdb.com node1-vip 192.168.7.82 node2-vip.szdb.com node2-vip #scan 192.168.7.91 scan-cluster1.szdb.com scan-cluster1 3、配置dns需要用到的安装包 [rootnode1 dns_rpm]# ls -hltr total 1.1M -rw-r--r-- 1 root root 45K Dec 7 18:04 bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm -rw-r--r-- 1 root root 985K Dec 7 18:04 bind-9.3.6-4.P1.el5_4.2.i386.rpm -rw-r--r-- 1 root root 61K Dec 7 18:04 caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm #下面安装rpm包 [rootnode1 dns_rpm]# rpm -Uvh bind-9.3.6-4.P1.el5_4.2.i386.rpm warning: bind-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159 Preparing... ########################################### [100%] 1:bind ########################################### [100%] [rootnode1 dns_rpm]# rpm -Uvh bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm warning: bind-chroot-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159 Preparing... ########################################### [100%] 1:bind-chroot ########################################### [100%] [rootnode1 dns_rpm]# rpm -Uvh caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm warning: caching-nameserver-9.3.6-4.P1.el5_4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 1e5e0159 Preparing... ########################################### [100%] 1:caching-nameserver ########################################### [100%] 4、配置DNS #关于DNS的配置分为以下几个步骤 #a.安装所需的rpm包 #b.配置named.conf文件 #c.配置zone文件包括正向和反向zone文件 #d.配置解析文件resolv.conf #e.启动dns服务 [rootnode1 ~]# cd /var/named/chroot/etc/ #使用下面的方式复制两个新的副本并修改参数-p表示连同权限及属主属组一同复制。切记不可忽略参数-p [rootnode1 etc]# cp -p named.caching-nameserver.conf named.conf [rootnode1 etc]# cp -p named.rfc1912.zones named.zones #修改named.conf文件将源文件中的所有localhost以及127.0.0.1修改成any注意any;前后保留空格 #该文件主要是配置dns监听那些端口以及ip地址并指明相应的名字解析zone文件名named.zones #下面是修改后的named.conf文件 [rootnode1 ~]# cat /var/named/chroot/etc/named.conf // // named.caching-nameserver.conf // // Provided by Red Hat caching-nameserver 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. // // DO NOT EDIT THIS FILE - use system-config-bind or an editor // to create named.conf - edits to this file will be lost on // caching-nameserver package upgrade. // 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; // Those options should be used carefully because they disable port // randomization // query-source port 53; // query-source-v6 port 53; allow-query { any; }; allow-query-cache { any; }; }; logging { channel default_debug { file data/named.run; severity dynamic; }; }; view localhost_resolver { match-clients { any; }; match-destinations { any; }; recursion yes; include /etc/named.zones; }; #修改named.zones文件该文件用于指定zone的搜索范围包括正向和反向。文件末尾最后的两个zone为新增加的 #注意每一个zone的file用于指向真正的zone文件后面要用到 # Author : Robinson # Blog : http://blog.csdn.net/robinson_0612 #下面是修改后的named.zones文件 [rootnode1 ~]# cat /var/named/chroot/etc/named.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 // // See /usr/share/doc/bind*/sample/ for example named configuration files. // zone . IN { type hint; file named.ca; }; zone localdomain IN { type master; file localdomain.zone; allow-update { none; }; }; zone localhost IN { type master; file localhost.zone; allow-update { none; }; }; zone 0.0.127.in-addr.arpa IN { type master; file named.local; allow-update { none; }; }; zone 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa IN { type master; file named.ip6.local; allow-update { none; }; }; zone 255.in-addr.arpa IN { type master; file named.broadcast; allow-update { none; }; }; zone 0.in-addr.arpa IN { type master; file named.zero; allow-update { none; }; }; #Add new zone added by Robinson #以下两个zone为新增的包含正向和反向zone zone szdb.com IN { type master; file node1.szdb.zero; allow-update { none; }; }; zone 7.168.192.in-addr.arpa IN { type master; file 7.168.192.local; allow-update { none; }; }; #配置正向和反向搜索数据库解析文件 [rootnode1 etc]# pwd /var/named/chroot/etc [rootnode1 etc]# cd ../var/named/ #同样使用cp -p 方式复制文件到新的正向和反向文件 [rootnode1 named]# cp -p named.zero node1.szdb.zero [rootnode1 named]# cp -p named.local 7.168.192.local #下面是修改之后的正向搜索文件也可以将host文件的其他ip对照编辑到正向搜索文件以实现解析 #如下面的例子将vip的参照关系也添加到解析文件 [rootnode1 named]# cat node1.szdb.zero $TTL 86400 IN SOA node1.szdb.com. root.szdb.com. ( 42 ; serial (d. adams) 3H ; refresh 15M ; retry 1W ; expiry 1D ) ; minimum IN NS node1.szdb.com. scan-cluster1 IN A 192.168.7.91 scan-cluster1 IN A 192.168.7.92 scan-cluster1.szdb.com IN A 192.168.7.91 scan-cluster1.szdb.com IN A 192.168.7.92 node1-vip IN A 192.168.7.81 node2-vip IN A 192.168.7.82 node1-vip.szdb.com IN A 192.168.7.81 node2-vip.szdb.com IN A 192.168.7.82 #下面是修改之后的反向搜索文件 [rootnode1 named]# cat 7.168.192.local $TTL 86400 IN SOA node1.szdb.com. root.szdb.com. ( 1997022700 ; Serial 28800 ; Refresh 14400 ; Retry 3600000 ; Expire 86400 ) ; Minimum IN NS node1.szdb.com. 1 IN PTR node1.szdb.com. 91 IN PTR scan-cluster1.szdb.com. 92 IN PTR scan-cluster1.szdb.com. 91 IN PTR scan-cluster1. 92 IN PTR scan-cluster1. 81 IN PTR node1-vip. 82 IN PTR node2-vip. 81 IN PTR node1-vip.szdb.com. 82 IN PTR node2-vip.szdb.com. #在各个节点配置resolv.conf文件 #下面是修改之后的内容 [rootnode1 named]# more /etc/resolv.conf ; generated by /sbin/dhclient-script #the following item removed by Robinson #search SSG-140 #nameserver 192.168.7.10 #nameserver 192.168.7.11 #the following item added by Robinson search szdb.com nameserver 192.168.7.71 #节点2上的resolv.conf文件 [rootnode2 ~]# more /etc/resolv.conf ; generated by /sbin/dhclient-script #search SSG-140 #nameserver 192.168.7.10 #nameserver 192.168.7.11 search szdb.com nameserver 192.168.7.71 #启动dns服务 [rootnode1 named]# service named restart Stopping named: [ OK ] Starting named: [ OK ] [rootnode1 named]# chkconfig named on #测试dns解析 [rootnode1 named]# cd ~ [rootnode1 ~]# nslookup 192.168.7.91 Server: 192.168.7.71 Address: 192.168.7.71#53 91.7.168.192.in-addr.arpa name scan-cluster1. 91.7.168.192.in-addr.arpa name scan-cluster1.szdb.com. [rootnode1 ~]# nslookup 192.168.7.92 Server: 192.168.7.71 Address: 192.168.7.71#53 92.7.168.192.in-addr.arpa name scan-cluster1.szdb.com. 92.7.168.192.in-addr.arpa name scan-cluster1. [rootnode1 ~]# nslookup scan-cluster1 Server: 192.168.7.71 Address: 192.168.7.71#53 Name: scan-cluster1.szdb.com Address: 192.168.7.92 Name: scan-cluster1.szdb.com Address: 192.168.7.91 [rootnode1 ~]# nslookup scan-cluster1.szdb.com. Server: 192.168.7.71 Address: 192.168.7.71#53 Name: scan-cluster1.szdb.com Address: 192.168.7.91 Name: scan-cluster1.szdb.com Address: 192.168.7.92 转http://blog.csdn.net/leshami/article/details/8291685#comments转载于:https://www.cnblogs.com/andy6/p/5877424.html
