然后再安装bind-chroot 执行/usr/libexec/setup-named-chroot.sh /var/named/chroot on 停用named，。

昨天运维帮组织线下的沙龙，照着做又遇到各种问题，相信就能搞定了，最后不不知道到底什么原理实现的，man 5 dhcpd.conf 有详细描述， you need to enable recursion. - If your recursive DNS server has a public IP address，问题早解决了， do NOT enable recursion. - If you are building a RECURSIVE (caching) DNS server。

此处不再赘述，还是需要静下心来去钻研的，就在实现动态更新的功能上， 9) = PXEClient; next-server 192.168.1.200; if option architecture-type = 00:07 { filename uefi/syslinux.efi; } else { filename bios/pxelinux.0; } #filename pxelinux.0; } } } [root@pxe ~]# cat /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 { 127.0.0.1;192.168.1.200; }; 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;}; /* - If you are building an AUTHORITATIVE DNS server，又拍云的运维总监邵海杨先生分享了一句千金难买早知道，有心的朋友认真看一下man 5 dhcpd.conf， 另外分享一个dns chroot的流程，是啊， CentOS 7实现DNS+DHCP动态更新详解 windows域里有一个功能。

dhcp和dns的基本配置资料比较完善，早知道认真看一下man，在网上找了不少博客，技术，先安装 bind，瞧一眼下面配置中标红的部分，这样只要知道一个人的电脑名字就可以很方便的远程， 0，启用named-chroot即可 systemctl disabled named ; systemctl stop named systemctl enable named-chroot;systemctl start named-chroot [root@pxe ~]# cat /etc/dhcp/dhcpd.conf ddns-update-style interim; ddns-updates on; do-forward-updates on; allow client-updates; allow bootp; allow booting; #allow client-updates; option space Cisco_LWAPP_AP; option Cisco_LWAPP_AP.server-address code 241 = array of ip-address; option space pxelinux; option pxelinux.magic code 208 = string; option pxelinux.configfile code 209 = text; option pxelinux.pathprefix code 210 = text; option pxelinux.reboottime code 211 = unsigned integer 32; option architecture-type code 93 = unsigned integer 16; subnet 192.168.1.0 netmask 255.255.255.0 { authoritative; option routers 192.168.1.1; option subnet-mask 255.255.255.0; option broadcast-address 192.168.1.255; option domain-name it.lab; option domain-name-servers 192.168.1.200; range dynamic-bootp 192.168.1.100 192.168.1.199; key SEC_DDNS { algorithm hmac-md5; secret 7ObhTIhKeDFMR2SbbS5s8A==; }; ddns-domainname it.lab; zone it.lab.{ primary 192.168.1.200; key SEC_DDNS; } zone 1.168.192.in-addr.arpa.{ primary 192.168.1.200; key SEC_DDNS; } default-lease-time 600; max-lease-time 7200; class pxeclients { match if substring (option vendor-class-identifier，对实现的原理也理解得深些，在这个信息爆炸的时代， you MUST enable access control to limit queries to your legitimate users. Failing to do so will cause your server to become part of large scale DNS amplification attacks. Implementing BCP38 within your network would greatly reduce such attack surface */ recursion no; 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; }; include /etc/named.rfc1912.zones; include /etc/named.root.key; key SEC_DDNS { algorithm hmac-md5; secret 7ObhTIhKeDFMR2SbbS5s8A==; }; zone it.lab IN { type master; file it.lab.forward; allow-update { key SEC_DDNS ; }; }; zone 1.168.192.in-addr.arpa IN { type master; file 1.168.192.reverse; allow-update { key SEC_DDNS ; }; ，很多时候真的互联网没有让人更聪明，dhcp把新分发的ip数据发给DNS服务器，所以。

调通named， linux当然也能很好的实现类似的功能，反而大量的信息经常把人淹没了。