高速缓存dns/ddns

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#####高速缓存dns#####

服务端：

[root@localhost ~]# yum search dns ###安装dns####

Loaded plugins: langpacks

rhel_dvd | 4.1 kB 00:00

(1/2): rhel_dvd/group_gz | 134 kB 00:00

(2/2): rhel_dvd/primary_db | 3.4 MB 00:00

=============================== N/S matched: dns ===============================

dnsmasq.x86_64 : A lightweight DHCP/caching DNS server

dnssec-trigger.x86_64 : NetworkManager plugin to update/reconfigure DNSSEC

: resolving

kdenetwork-kdnssd.x86_64 : Kdnssd

ldns.i686 : Low-level DNS(SEC) library with API

ldns.x86_64 : Low-level DNS(SEC) library with API

perl-Net-DNS.x86_64 : DNS resolver modules for Perl

python-dns.noarch : DNS toolkit for Python

bind.x86_64 : The Berkeley Internet Name Domain (BIND) DNS (Domain Name System)

: server

bind-chroot.x86_64 : A chroot runtime environment for the ISC BIND DNS server,

: named(8)

bind-libs.i686 : Libraries used by the BIND DNS packages

bind-libs.x86_64 : Libraries used by the BIND DNS packages

bind-libs-lite.i686 : Libraries for working with the DNS protocol

bind-libs-lite.x86_64 : Libraries for working with the DNS protocol

bind-license.noarch : License of the BIND DNS suite

bind-utils.x86_64 : Utilities for querying DNS name servers

c-ares.i686 : A library that performs asynchronous DNS operations

c-ares.x86_64 : A library that performs asynchronous DNS operations

seahorse-sharing.x86_64 : Sharing of PGP public keys via DNS-SD and HKP

unbound.x86_64 : Validating, recursive, and caching DNS(SEC) resolver

Name and summary matches only, use "search all" for everything.

[root@localhost ~]# yum install bind.x86_64 -y

Loaded plugins: langpacks

Resolving Dependencies

--> Running transaction check

---> Package bind.x86_64 32:9.9.4-14.el7 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

================================================================================

Package Arch Version Repository Size

================================================================================

Installing:

bind x86_64 32:9.9.4-14.el7 rhel_dvd 1.8 M

Transaction Summary

================================================================================

Install 1 Package

Total download size: 1.8 M

Installed size: 4.3 M

Downloading packages:

bind-9.9.4-14.el7.x86_64.rpm | 1.8 MB 00:00

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

Installing : 32:bind-9.9.4-14.el7.x86_64 1/1

Verifying : 32:bind-9.9.4-14.el7.x86_64 1/1

Installed:

bind.x86_64 32:9.9.4-14.el7

Complete!

[root@localhost ~]# systemctl stop firewalld.service

[root@localhost ~]# ll /etc/rndc.key ###在没有开启named服务的时候，该文件不存在#####

ls: cannot access /etc/rndc.key: No such file or directory

[root@localhost ~]# systemctl start named ###开启服务，若是许久没有开启可能是字符不够，在虚拟机上随便输入几个字符####

[root@localhost ~]# ll /etc/rndc.key

-rw-r-----. 1 root named 77 May 5 22:13 /etc/rndc.key

[root@localhost ~]# vim /etc/named.conf

options {

listen-on port 53 { any; }; ###回环接口不与外界交互，改成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; }; ###允许任何人连###

forwarders {172.25.254.250;}; ####如果高速缓存dns找不到就到172.25.254.250找####

- If you are building an AUTHORITATIVE DNS server, do NOT enable recursion.

[root@localhost ~]# systemctl restart named ###重启服务###

客户端：

[root@localhost ~]# vim /etc/resolv.conf ###在里面指明dns服务器###

# Generated by NetworkManager

search example.com

nameserver 172.25.254.112 ###dns服务器（服务端）为172.25.254.112####

# No nameservers found; try putting DNS servers into your

# ifcfg files in /etc/sysconfig/network-scripts like so:

# DNS1=xxx.xxx.xxx.xxx

# DNS2=xxx.xxx.xxx.xxx

# DOMAIN=lab.foo.com bar.foo.com

[root@localhost ~]# dig www.baidu.com

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> www.baidu.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47262

;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 13, ADDITIONAL: 1

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;www.baidu.com.INA

;; ANSWER SECTION:

www.baidu.com.376INCNAMEwww.a.shifen.com.

www.a.shifen.com.300INA183.232.231.172

www.a.shifen.com.300INA183.232.231.173

;; AUTHORITY SECTION:

.513219INNSk.root-servers.net.

.513219INNSc.root-servers.net.

.513219INNSa.root-servers.net.

.513219INNSg.root-servers.net.

.513219INNSi.root-servers.net.

.513219INNSh.root-servers.net.

.513219INNSm.root-servers.net.

.513219INNSe.root-servers.net.

.513219INNSf.root-servers.net.

.513219INNSb.root-servers.net.

.513219INNSl.root-servers.net.

.513219INNSd.root-servers.net.

.513219INNSj.root-servers.net.

;; Query time: 349 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Fri May 05 22:17:05 EDT 2017

;; MSG SIZE rcvd: 312

####构造dns###

服务端：

[root@server ~]# vim /etc/named.conf

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; };

[root@server ~]# vim /etc/named.rfc1912.zones

zone "westos.com" IN {

type master;

file "westos.com.zone";

allow-update { none; };

};

[root@server ~]# cd /var/named/

[root@server named]# ll

total 20

drwxrwx---. 2 named named 22 May 5 22:13 data

drwxrwx---. 2 named named 30 May 5 23:30 dynamic

-rw-r-----. 1 root named 2076 Jan 28 2013 named.ca

-rw-r-----. 1 root named 152 Dec 15 2009 named.empty

-rw-r-----. 1 root named 152 Jun 21 2007 named.localhost

-rw-r-----. 1 root named 168 Dec 15 2009 named.loopback

drwxrwx---. 2 named named 6 Jan 29 2014 slaves

-rw-r-----. 1 root named 349 May 5 23:29 westos.com.zone

[root@server named]# cp -p named.localhost westos.com.zone

[root@server named]# vim westos.com.zone ###编写A记录文件####

$TTL 1D

@ ##（之后的内容为westos.com） IN SOA dns.westos.com. root.westos.com. (

即/etc/named.conf里面引号内内容

0 ; serial

1D ; refresh

1H ; retry

1W ; expire

3H ) ; minimum

NS dns.westos.com.

dns A 172.25.254.112

www A 172.25.254.212

[root@server named]# systemctl restart named

客户端：

[root@localhost ~]# vim /etc/resolv.conf

# Generated by NetworkManager

search example.com

nameserver 172.25.254.112

[root@localhost ~]# dig www.westos.com

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> www.westos.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29432

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;www.westos.com.INA

;; ANSWER SECTION:

www.westos.com.86400INA172.25.254.212

;; AUTHORITY SECTION:

westos.com.86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.254.112

;; Query time: 0 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Fri May 05 23:14:27 EDT 2017

;; MSG SIZE rcvd: 93

#####CNAME,MX#####

服务器：

[root@server ~]# vim /var/named/westos.com.zone

$TTL 1D

@ IN SOA dns.westos.com. root.westos.com. (

0 ; serial

1D ; refresh

1H ; retry

1W ; expire

3H ) ; minimum

NS dns.westos.com.

dns A 172.25.254.112

www A 172.25.254.212

music CNAME music.a.westos.com.

music.a A 172.25.254.111

music.a A 172.25.254.222

westos.com. MX 1 172.25.254.100.

[root@server ~]# systemctl restart named

[root@server ~]#

客户端:

[root@localhost ~]# dig music.westos.com

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> music.westos.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14025

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;music.westos.com.INA

;; ANSWER SECTION:

music.westos.com.86400INCNAMEmusic.a.westos.com.

music.a.westos.com.86400INA172.25.254.111

music.a.westos.com.86400INA172.25.254.222

;; AUTHORITY SECTION:

westos.com.86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.254.112

;; Query time: 0 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Fri May 05 23:30:33 EDT 2017

;; MSG SIZE rcvd: 133

[root@localhost ~]# dig -t mx westos.com

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> -t mx westos.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33372

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;westos.com.INMX

;; ANSWER SECTION:

westos.com.86400INMX1 172.25.254.100.

;; AUTHORITY SECTION:

westos.com.86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.254.112

;; Query time: 0 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Fri May 05 23:30:46 EDT 2017

;; MSG SIZE rcvd: 103

####不同网关####

服务端：

[root@server ~]# cp /etc/named.rfc1912.zones /etc/named.rfc1912.inter -p

[root@server ~]# vim /etc/named.rfc1912.inter

zone "westos.com" IN {

type master;

file "westos.com.inter";

allow-update { none; };

};

[root@server ~]# cp /var/named/westos.com.zone /var/named/westos.com.inter -p

[root@server ~]# vim /var/named/westos.com.inter

$TTL 1D

@ IN SOA dns.westos.com. root.westos.com. (

0 ; serial

1D ; refresh

1H ; retry

1W ; expire

3H ) ; minimum

NS dns.westos.com.

dns A 172.25.12.112

www A 172.25.12.212

music CNAME music.a.westos.com.

music.a A 172.25.12.111

music.a A 172.25.12.222

westos.com. MX 1 172.25.12.100.

[root@server ~]# vim /etc/named.conf

view localnet{

match-clients { 172.25.254.0/24; };

zone "." IN {

type hint;

file "named.ca";

};

include "/etc/named.rfc1912.zones";

};

view internet{

match-clients { 172.25.12.0/24; };

zone "." IN {

type hint;

file "named.ca";

};

include "/etc/named.rfc1912.inter";

};

[root@server ~]# systemctl restart named

客户端：

[root@localhost ~]# dig www.westos.com ###ip为客户端####

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> www.westos.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20946

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;www.westos.com.INA

;; ANSWER SECTION:

www.westos.com.86400INA172.25.254.212

;; AUTHORITY SECTION:

westos.com.86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.254.112

;; Query time: 0 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Sat May 06 02:31:35 EDT 2017

;; MSG SIZE rcvd: 93

[root@localhost ~]# vim /etc/resolv.conf ###ip为172.25.12.213的客户端###

# Generated by NetworkManager

search example.com

nameserver 172.25.12.113

# No nameservers found; try putting DNS servers into your

# ifcfg files in /etc/sysconfig/network-scripts like so:

# DNS1=xxx.xxx.xxx.xxx

# DNS2=xxx.xxx.xxx.xxx

# DOMAIN=lab.foo.com bar.foo.com

[root@localhost ~]# dig www.westos.com

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> www.westos.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51552

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;www.westos.com.INA

;; ANSWER SECTION:

www.westos.com.86400INA172.25.12.213

;; AUTHORITY SECTION:

westos.com.86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.12.213

;; Query time: 0 msec

;; SERVER: 172.25.12.100#53(172.25.12.100)

;; WHEN: Sat May 06 02:40:07 EDT 2017

;; MSG SIZE rcvd: 93

###反向解析####

服务端：

[root@server ~]# vim /etc/named.rfc1912.zones

zone "254.25.172.in-addr.arpa" IN { ###将dns服务器所在网段反着写####

type master;

file "westos.comNaNr";

allow-update { none; };

};

[root@server ~]# cd /var/named/

[root@server named]# ll

total 28

drwxrwx---. 2 named named 22 May 5 22:13 data

drwxrwx---. 2 named named 4096 May 6 03:07 dynamic

-rw-r-----. 1 root named 2076 Jan 28 2013 named.ca

-rw-r-----. 1 root named 152 Dec 15 2009 named.empty

-rw-r-----. 1 root named 152 Jun 21 2007 named.localhost

-rw-r-----. 1 root named 168 Dec 15 2009 named.loopback

drwxrwx---. 2 named named 6 Jan 29 2014 slaves

-rw-r-----. 1 root named 344 May 6 01:57 westos.com.inter

-rw-r-----. 1 root named 349 May 5 23:29 westos.com.zone

[root@server named]# cp -p named.loopback /var/named/westos.comNaNr

[root@server named]# vim /var/named/westos.comNaNr

$TTL 1D

@ IN SOA dns.westos.com. root.westos.com. (

0 ; serial

1D ; refresh

1H ; retry

1W ; expire

3H ) ; minimum

NS dns.westos.com.

dns A 172.25.254.112

111 PTR www.westos.com.

222 PTR bbs.westos.com.

[root@server named]# systemctl restart named

客户端：

[root@localhost ~]# dig -x 172.25.254.111

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> -x 172.25.254.111

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34839

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;111.254.25.172.in-addr.arpa.INPTR

;; ANSWER SECTION:

111.254.25.172.in-addr.arpa. 86400 INPTRwww.westos.com.

;; AUTHORITY SECTION:

254.25.172.in-addr.arpa. 86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.254.112

;; Query time: 0 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Sat May 06 03:27:08 EDT 2017

;; MSG SIZE rcvd: 118

[root@localhost ~]# dig -x 172.25.254.222

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> -x 172.25.254.222

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14617

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;222.254.25.172.in-addr.arpa.INPTR

;; ANSWER SECTION:

222.254.25.172.in-addr.arpa. 86400 INPTRbbs.westos.com.

;; AUTHORITY SECTION:

254.25.172.in-addr.arpa. 86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.254.112

;; Query time: 1 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Sat May 06 03:30:35 EDT 2017

;; MSG SIZE rcvd: 118

####配置钥匙###

服务端：

[root@server mnt]# dnssec-keygen --help

dnssec-keygen: invalid argument --

Usage:

dnssec-keygen [options] name

Version: 9.9.4-RedHat-9.9.4-14.el7

name: owner of the key

Options:

-K <directory>: write keys into directory

-a <algorithm>:

RSASHA256 | RSASHA512 | ECCGOST |

ECDSAP256SHA256 | ECDSAP384SHA384 |

HMAC-SHA384 | HMAC-SHA512

(default: RSASHA1, or NSEC3RSASHA1 if using -3)

-3: use NSEC3-capable algorithm

-b <key size in bits>:

RSAMD5:[512..4096]

RSASHA1:[512..4096]

NSEC3RSASHA1:[512..4096]

RSASHA256:[512..4096]

RSASHA512:[1024..4096]

DH:[128..4096]

DSA:[512..1024] and divisible by 64

NSEC3DSA:[512..1024] and divisible by 64

ECCGOST:ignored

ECDSAP256SHA256:ignored

ECDSAP384SHA384:ignored

HMAC-MD5:[1..512]

HMAC-SHA1:[1..160]

HMAC-SHA224:[1..224]

HMAC-SHA256:[1..256]

HMAC-SHA384:[1..384]

HMAC-SHA512:[1..512]

(if using the default algorithm, key size

defaults to 2048 for KSK, or 1024 for all others)

-n <nametype>: ZONE | HOST | ENTITY | USER | OTHER

(DNSKEY generation defaults to ZONE)

-c <class>: (default: IN)

-d <digest bits> (0 => max, default)

-E <engine name>

-f <keyflag>: KSK | REVOKE

-g <generator>: use specified generator (DH only)

-L <ttl>: default key TTL

-p <protocol>: (default: 3 [dnssec])

-r <randomdev>: a file containing random data

-s <strength>: strength value this key signs DNS records with (default: 0)

-T <rrtype>: DNSKEY | KEY (default: DNSKEY; use KEY for SIG(0))

ECCGOST:ignored

-t <type>: AUTHCONF | NOAUTHCONF | NOAUTH | NOCONF (default: AUTHCONF)

-h: print usage and exit

-m <memory debugging mode>:

usage | trace | record | size | mctx

-v <level>: set verbosity level (0 - 10)

Timing options:

-P date/[+-]offset/none: set key publication date (default: now)

-A date/[+-]offset/none: set key activation date (default: now)

-R date/[+-]offset/none: set key revocation date

-I date/[+-]offset/none: set key inactivation date

-D date/[+-]offset/none: set key deletion date

-G: generate key only; do not set -P or -A

-C: generate a backward-compatible key, omitting all dates

-S <key>: generate a successor to an existing key

-i <interval>: prepublication interval for successor key (def[r[

[root@server mnt]# dnssec-keygen -a HMAC-MD5 -b 128 -n HOST westoskey

Kwestoskey.+157+33334

[root@server mnt]# ls

Kwestoskey.+157+33334.key westos.com.zone

Kwestoskey.+157+33334.private

[root@server mnt]#cat Kwestoskey.+157+33334.private

Private-key-format: v1.3

Algorithm: 157 (HMAC_MD5)

Key: TKSWfTJrHFxAmJXz7LWHbg==

Bits: AAA=

Created: 20170509052622

Publish: 20170509052622

Activate: 20170509052622

[root@server mnt]# cp -p /etc/rndc.key /etc/westos.key

[root@server mnt]# vim /etc/westos.key

[root@server mnt]# cat /etc/westos.key

key "westoskey" {

algorithm hmac-md5;

secret "TKSWfTJrHFxAmJXz7LWHbg==";

};

[root@server mnt]# vim /etc/named.conf

[root@server mnt]# systemctl restart named

[root@server mnt]# vim /etc/named.rfc1912.zones

[root@server mnt]# systemctl restart named

[root@server mnt]# scp Kwestoskey.+157+33334.* root@172.25.254.213:/mnt/ ##把密码给客户端

The authenticity of host ‘172.25.254.213 (172.25.254.213)‘ can‘t be established.

ECDSA key fingerprint is eb:24:0e:07:96:26:b1:04:c2:37:0c:78:2d:bc:b0:08.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added ‘172.25.254.213‘ (ECDSA) to the list of known hosts.

root@172.25.254.213‘s password:

Kwestoskey.+157+33334.key 100% 53 0.1KB/s 00:00

Kwestoskey.+157+33334.private 100% 165 0.2KB/s 00:00

[root@localhost named]# systemctl restart named

客户端：

[root@dns mnt]# nsupdate -k /mnt/Kwestoskey.+157+33334.private

> server 172.25.254.113

> update add hello.westos.com 86400 A 172.25.254.111

> send

[root@dns mnt]# dig hello.westos.com

; <<>> DiG 9.9.4-RedHat-9.9.4-14.el7 <<>> hello.westos.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60850

;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;hello.westos.com.INA

;; ANSWER SECTION:

hello.westos.com.86400INA172.25.254.111

;; AUTHORITY SECTION:

westos.com.86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.254.113

;; Query time: 3 msec

;; SERVER: 172.25.254.113#53(172.25.254.113)

;; WHEN: Tue May 09 02:50:19 EDT 2017

;; MSG SIZE rcvd: 95

####dns的更新###

///但重启服务时，文件就变了，与缓存文件同步

cp -p /var/named/westos.com.zone /mnt

vim /etc/named.rfc1912.zones

zone "westos.com" IN {

type master;

file "westos.com.zone";

allow-update { 172.25.254.213; }; ##允许谁更新

};

chmod 770 /var/named

[root@localhost ~]# setsebool -P named_write_master_zones 1

[root@localhost ~]# getsebool -a | grep named

named_tcp_bind_http_port --> off

named_write_master_zones --> on

systemctl restart named

5.check on 172.25.254.213

[root@dns ~]# nsupdate

> server 172.25.254.113 ##服务端

> update add hello.westos.com 86400 A 172.25.254.111

> send

[root@server named]# vim /var/named/westos.com.zone

$ORIGIN .

$TTL 86400 ; 1 day

westos.com IN SOA dns.westos.com. root.westos.com. (

1 ; serial

86400 ; refresh (1 day)

3600 ; retry (1 hour)

604800 ; expire (1 week)

10800 ; minimum (3 hours)

)

NS dns.westos.com.

MX 1 172.25.254.100.

$ORIGIN westos.com.

music.a A 172.25.254.111

A 172.25.254.222

dns A 172.25.254.112

hello A 172.25.254.222

music CNAME music.a

www A 172.25.254.212

[root@server named]# ls

data named.empty slaves westos.com.zone

dynamic named.localhost westos.com.inter westos.com.zone.jnl

named.ca named.loopback westos.comNaNr

[root@server named]# vim /var/named/westos.com.zone

[root@server named]# rm -fr westos.com.zone westos.com.zone.jnl ###将缓存文件和变了的文件删除###

[root@server named]# cp -p /mnt/westos.com.zone . ###将之前的文件复制过来###

[root@server named]# ls

data named.empty slaves westos.com.zone

dynamic named.localhost westos.com.inter

named.ca named.loopback westos.comNaNr

[root@server named]# systemctl restart named

[root@server named]# vim /var/named/westos.com.zone

$TTL 1D

@ IN SOA dns.westos.com. root.westos.com. (

0 ; serial

1D ; refresh

1H ; retry

1W ; expir 3H ) ; minimum

NS dns.westos.com.

dns A 172.25.254.113

www A 172.25.254.213

music CNAME music.a.westos.com.

music.a A 172.25.254.111

westos.com. MX 1 172.25.254.113.

技术分享

####dhcp更新dns（ddns）####

1.install software

yum install dhcp -y

2.mk configfile

[root@localhost ~]# cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf

cp: overwrite ‘/etc/dhcp/dhcpd.conf’? y ##

3.change configfile

vim /etc/dhcp/dhcpd.conf

[root@localhost ~]# cat /etc/dhcp/dhcpd.conf

# dhcpd.conf

# Sample configuration file for ISC dhcpd

# option definitions common to all supported networks...

option domain-name "westos.com";

option domain-name-servers 172.25.254.113;

default-lease-time 600;

max-lease-time 7200;

# Use this to enble / disable dynamic dns updates globally.

ddns-update-style interim;

# If this DHCP server is the official DHCP server for the local

# network, the authoritative directive should be uncommented.

#authoritative;

# Use this to send dhcp log messages to a different log file (you also

# have to hack syslog.conf to complete the redirection).

log-facility local7;

# No service will be given on this subnet, but declaring it helps the

# DHCP server to understand the network topology.

# This is a very basic subnet declaration.

subnet 172.25.254.0 netmask 255.255.255.0 {

range 172.25.254.60 172.25.254.70;

option routers 172.25.254.250;

}

key "westoskey" {

algorithm hmac-md5;

secret "TKSWfTJrHFxAmJXz7LWHbg==";

};

zone westos.com. {

primary 127.0.0.1;

key westoskey;

}

4.check

*)拔掉网线

*)在客户端检测

hostnamectl set-hostname test.westos.com

vim /etc/sysconfig/network-scripts/ifcfg-eth0

[root@dns ~]# hostnamectl set-hostname dns.westos.com

[root@dns ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0

[root@dns ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

BOOTPROTO=dhcp

ONBOOT=yes

systemctl restart network

dig test.westos.com

技术分享

本文出自 “AELY木” 博客，请务必保留此出处http://12768057.blog.51cto.com/12758057/1924102

高速缓存dns/ddns

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