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本篇內(nèi)容介紹了“CentOS7.0中怎么部署DNS服務(wù)器”的有關(guān)知識,在實(shí)際案例的操作過程中,不少人都會遇到這樣的困境,接下來就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
DNS(Domain Name System,域名系統(tǒng)),因特網(wǎng)上作為域名和IP地址相互映射的一個分布式數(shù)據(jù)庫,能夠使用戶更方便的訪問互聯(lián)網(wǎng),而不用去記住能夠被機(jī)器直接讀取的IP數(shù)串。通過主機(jī)名,最終得到該主機(jī)名對應(yīng)的IP地址的過程叫做域名解析(或主機(jī)名解析)。
[root@centos7 ~]# yum install bind-chroot bind -y
[root@centos7 ~]# cp -R /usr/share/doc/bind-*/sample/var/named/* /var/named/chroot/var/named/
[root@centos7 ~]# touch /var/named/chroot/var/named/data/cache_dump.db[root@centos7 ~]# touch /var/named/chroot/var/named/data/named_stats.txt[root@centos7 ~]# touch /var/named/chroot/var/named/data/named_mem_stats.txt[root@centos7 ~]# touch /var/named/chroot/var/named/data/named.run[root@centos7 ~]# mkdir /var/named/chroot/var/named/dynamic[root@centos7 ~]# touch /var/named/chroot/var/named/dynamic/managed-keys.bind
[root@centos7 ~]# chmod -R 777 /var/named/chroot/var/named/data[root@centos7 ~]# chmod -R 777 /var/named/chroot/var/named/dynamic
[root@centos7 ~]# cp -p /etc/named.conf /var/named/chroot/etc/named.conf
在 named.conf 文件尾添加 example.local 域信息, 創(chuàng)建轉(zhuǎn)發(fā)域(Forward Zone)與反向域(Reverse Zone)(LCTT 譯注:這里example.local 并非一個真實(shí)有效的互聯(lián)網(wǎng)域名,而是通常用于本地測試的一個域名;如果你需要做權(quán)威 DNS 解析,你可以將你擁有的域名如這里所示配置解析。):
[root@centos7 ~]# vi /var/named/chroot/etc/named.conf
–
.. .. zone "example.local" { type master; file "example.local.zone"; }; zone "0.168.192.in-addr.arpa" IN { type master; file "192.168.0.zone"; }; .. ..
named.conf 完全配置如下:
// // named.conf // // 由Red Hat提供,將 ISC BIND named(8) DNS服務(wù)器 // 配置為暫存域名服務(wù)器 (用來做本地DNS解析). // // 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; }; /* - 如果你要建立一個 授權(quán)域名服務(wù)器 服務(wù)器, 那么不要開啟 recursion(遞歸) 功能。 - 如果你要建立一個 遞歸 DNS 服務(wù)器, 那么需要開啟recursion 功能。 - 如果你的遞歸DNS服務(wù)器有公網(wǎng)IP地址, 你必須開啟訪問控制功能, 只有那些合法用戶才可以發(fā)詢問. 如果不這么做的話,那么你的服 服務(wù)就會受到DNS 放大攻擊。實(shí)現(xiàn)BCP38將有效抵御這類攻擊。 */ recursion yes; dnssec-enable yes; dnssec-validation yes; dnssec-lookaside auto; /* Path to ISC DLV key */ bindkeys-file "/etc/named.iscdlv.key"; managed-keys-directory "/var/named/dynamic"; pid-file "/run/named/named.pid"; session-keyfile "/run/named/session.key"; }; logging { channel default_debug { file "data/named.run"; severity dynamic; }; }; zone "." IN { type hint; file "named.ca"; }; zone "example.local" { type master; file "example.local.zone"; }; zone "0.168.192.in-addr.arpa" IN { type master; file "192.168.0.zone"; }; include "/etc/named.rfc1912.zones"; include "/etc/named.root.key";
a)創(chuàng)建轉(zhuǎn)發(fā)域
[root@centos7 ~]# vi /var/named/chroot/var/named/example.local.zone
添加如下內(nèi)容并保存:
; ; Addresses and other host information. ;$TTL 86400 @ IN SOA example.local. hostmaster.example.local. ( 2014101901 ; Serial 43200 ; Refresh 3600 ; Retry 3600000 ; Expire 2592000 ) ; Minimum ; Define the nameservers and the mail servers IN NS ns1.example.local. IN NS ns2.example.local. IN A 192.168.0.70 IN MX 10 mx.example.local. centos7 IN A 192.168.0.70 mx IN A 192.168.0.50 ns1 IN A 192.168.0.70 ns2 IN A 192.168.0.80
b)創(chuàng)建反向域
[root@centos7 ~]# vi /var/named/chroot/var/named/192.168.0.zone
–
; ; Addresses and other host information. ;$TTL 86400 @ IN SOA example.local. hostmaster.example.local. ( 2014101901 ; Serial 43200 ; Refresh 3600 ; Retry 3600000 ; Expire 2592000 ) ; Minimum 0.168.192.in-addr.arpa. IN NS centos7.example.local. 70.0.168.192.in-addr.arpa. IN PTR mx.example.local. 70.0.168.192.in-addr.arpa. IN PTR ns1.example.local. 80.0.168.192.in-addr.arpa. IN PTR ns2.example.local.。
[root@centos7 ~]# /usr/libexec/setup-named-chroot.sh /var/named/chroot on[root@centos7 ~]# systemctl stop named[root@centos7 ~]# systemctl disable named[root@centos7 ~]# systemctl start named-chroot[root@centos7 ~]# systemctl enable named-chrootln -s '/usr/lib/systemd/system/named-chroot.service' '/etc/systemd/system/multi-user.target.wants/named-chroot.service'
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