高速缓存dns

Posted 2020-09-17

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第三单元

高速缓存dns

一 dns

1 权威名称服务器

存储并提供某区域 ( 整个 DNS 域或 DNS 域的一部分 ) 的实际数据。权威名称服

务器的类型包括

Master : 包含原始区域数据。有时称作 “ 主要 ” 名称服务器

Slave : 备份服务器 , 通过区域传送从 Master 服务器获得的区域数据的副本。有时称作 “ 次要 ”名称服务器

2 非权威/递归名称服务器

客户端通过其查找来自权威名称服务器的数据

3 DNS 查找

二 DNS 资源记录

DNS 区域采用资源记录的形式存储信息。每条资源记录均具有一个类型 , 表明其保留的数据类型：

A : 名称至 IPv4 地址

AAAA : 名称至 IPv6 地址

CNAME : 名称至 ” 规范名称 “ ( 包含 A/AAAA 记录的另一个名称 )

PTR : IPv4/IPv6 地址至名称

MX : 用于名称的邮件交换器 ( 向何处发送其电子邮件 )

NS : 域名的名称服务器

SOA :” 授权起始 “ , DNS 区域的信息 ( 管理信息 )

三 DNS 排错

它显示来自 DNS 查找的详细信息 , 其中包括为什么查询失败 :

NOERROR : 查询成功

NXDOMAIN : DNS 服务器提示不存在这样的名称

SERVFAIL : DNS 服务器停机或 DNSSEC 响应验证失败

REFUSED : DNS 服务器拒绝回答 ( 也许是出于访问控制原因 )

四缓存dns服务器

服务端：

1 yum install bind.x86_64 -y ###安装dns###

2 systemctl stop firewalld.service ###关闭防火墙###

3 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####

4 vim /etc/named.conf ###编辑主配置文件###

修改其中几行为：

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

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（权威名称服务器）找####

5 systemctl restart named ###重启服务###

客户端：

1 vim /etc/resolv.conf ###在里面指明dns服务器###

2 测试：dig www.baidu.com ###dig指出关于查询和答案的信息###

过程如下：

[[email protected] ~]# yum search dns

[[email protected] ~]# yum install bind.x86_64 -y

[[email protected] ~]# systemctl stop firewalld.service

[[email protected] ~]# 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

[[email protected] ~]# 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####

[[email protected] ~]# ll /etc/rndc.key

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

[[email protected] ~]# vim /etc/named.conf

[[email protected] ~]# systemctl restart named ###重启服务###

客户端：

[[email protected] ~]# vim /etc/resolv.conf ###在里面指明dns服务器###

[[email protected] ~]# 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 ###NOERROR表示查询成功#######

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

;; OPT PSEUDOSECTION:

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

;; QUESTION SECTION: #####要查询什么####

;www.baidu.com.INA

;; ANSWER SECTION: ####响应######

www.baidu.com.376INCNAMEwww.a.shifen.com. ###CNAME : 名称至 ” 规范名称 “####

www.a.shifen.com.300INA183.232.231.172 ###A : 名称至 IPv4 地址####

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 ####指出发送查询的递归名称服务器以及获得响应所花费的时间###

;; SERVER: 172.25.254.112#53(172.25.254.112)

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

;; MSG SIZE rcvd: 312

五编写A记录文件

服务端：

1 vim /etc/named.conf

2 vim /etc/named.rfc1912.zones

3 cd /var/named/

4 cp -p named.localhost westos.com.zone ####用模板生成A记录配置文件，一定要-p，不然可能会出现权限错误#####

5 vim westos.com.zone ###编写A记录文件####

6 systemctl restart named ####重启服务###

客户端：

1 vim /etc/resolv.conf

2 测试： dig www.westos.com

过程如下：

服务端：

[[email protected] ~]# 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; };

[[email protected] ~]# vim /etc/named.rfc1912.zones

zone "westos.com" IN { ###指定要维护的域名###

type master;

file "westos.com.zone"; ###指定A记录文件名###

allow-update { none; };

};

[[email protected] ~]# cd /var/named/

[[email protected] 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

[[email protected] named]# cp -p named.localhost westos.com.zone

[[email protected] named]# vim westos.com.zone ###编写A记录文件####

$TTL 1D ###指缓存一天###

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

0 ; serial

1D ; refresh

1H ; retry

1W ; expire

3H ) ; minimum

NS dns.westos.com. ###指定dns主机###

dns A 172.25.254.112 ###指定dns主机的A记录###

www A 172.25.254.212 ###要添加的A记录###

###第一个@符指zone“...”双引号的内容，此处指westo.com;dns.westos.com.指dns服务器的名称，结尾.不能少，不然会自动补齐@符的内容###

[[email protected] named]# systemctl restart named

客户端：

[[email protected] ~]# vim /etc/resolv.conf

# Generated by NetworkManager

search example.com

nameserver 172.25.254.112

[[email protected] ~]# 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: ####负责域(区域)的名称服务器###

westos.com.86400INNSdns.westos.com.

;; ADDITIONAL SECTION: ###提供的其他信息 , 通常是关于名称服务器#####

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

六在A记录文件中添加CNAME和MX

服务端：

vim /var/named/westos.com.zone ###编辑A记录文件###

systemctl restart named ###重启服务###

客户端：

测试：dig music.westos.com

dig -t mx westos.com

过程如下：

服务器：

[[email protected] ~]# 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.

[[email protected] ~]# systemctl restart named

[[email protected] ~]#

客户端:

[[email protected] ~]# 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

[[email protected] ~]# 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

七不同的网段使用不同的dns

服务端：

1 cp /etc/named.rfc1912.zones /etc/named.rfc1912.inter -p

2 vim /etc/named.rfc1912.inter

3 cp /var/named/westos.com.zone /var/named/westos.com.inter -p

4 vim /var/named/westos.com.inter

5 vim /etc/named.conf

6 systemctl restart named

客户端：

测试：dig www.westos.com ###ip为172.25.254.212的客户端####

dig www.westos.com ###ip为172.25.12.101的客户端###

过程如下：

[[email protected] ~]# cp /etc/named.rfc1912.zones /etc/named.rfc1912.inter -p

[[email protected] ~]# vim /etc/named.rfc1912.inter

zone "westos.com" IN {

type master;

file "westos.com.inter";

allow-update { none; };

};

[[email protected] ~]# cp /var/named/westos.com.zone /var/named/westos.com.inter -p

[[email protected] ~]# 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.

[[email protected] ~]# vim /etc/named.conf

[[email protected] ~]# systemctl restart named

客户端：

[[email protected] ~]# dig www.westos.com ###ip为172.25.254.212的客户端####

; <<>> 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

[[email protected] ~]# vim /etc/resolv.conf ###ip为172.25.12.101的客户端###

# Generated by NetworkManager

search example.com

nameserver 172.25.12.100

# 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

[[email protected] ~]# 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.86400INA172.25.12.212

;; AUTHORITY SECTION:

westos.com.86400INNSdns.westos.com.

;; ADDITIONAL SECTION:

dns.westos.com.86400INA172.25.12.112

;; 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

八反向解析

服务端：

1 vim /etc/named.rfc1912.zones

2 cd /var/named/

3 cp -p named.loopback /var/named/westos.comNaNr

4 vim /var/named/westos.comNaNr

5 systemctl restart named

客户端：

测试：dig -x 172.25.254.111

过程如下：

服务端：

[[email protected] ~]# 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; };

};

[[email protected] ~]# cd /var/named/

[[email protected] 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

[[email protected] named]# cp -p named.loopback /var/named/westos.comNaNr

[[email protected] named]# vim /var/named/westos.comNaNr

[[email protected] named]# systemctl restart namede

客户端：

[[email protected] ~]# 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

[[email protected] ~]# 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

[[email protected] ~]# 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: 17706

;; 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: 0 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Sat May 06 03:30:39 EDT 2017

;; MSG SIZE rcvd: 118

九更新dns

服务端：

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

2 vim /etc/named.rfc1912.zones

zone "westos.com" IN {

type master;

file "westos.com.zone";

allow-update { 172.25.254.212; }; ###允许谁去更新###

};

3 systemctl restart named

4 chmod 770 /var/named/

5 setsebool -P named_write_master_zones 1

客户端：

测试：

1 nsupdate ###添加###

> server 172.25.254.112

> update add hello.westos.com 86400 A 172.25.254.222

> send

2 dig hello.westos.com ###查看###

3 nsupdate ###删除####

> server 172.25.254.112

> update delete hello.westos.com

> send

过程如下：

服务端：

[[email protected] named]# cp -p /var/named/westos.com.zone /mnt/

[[email protected] named]# vim /etc/named.rfc1912.zones

zone "westos.com" IN {

type master;

file "westos.com.zone";

allow-update { 172.25.254.212; };

};

[[email protected] named]# systemctl restart named

[[email protected] named]# chmod 770 /var/named/

[[email protected] named]# setsebool -P named_write_master_zones 1

客户端：

[[email protected] ~]# nsupdate

> server 172.25.254.112

> update add hello.westos.com 86400 A 172.25.254.222

> send

> ^C[[email protected] ~]# 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: 12735

;; 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.86400INA172.25.254.222

;; 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: Sat May 06 04:05:37 EDT 2017

;; MSG SIZE rcvd: 95

###但重启服务时，westos.com.zone文件内容就变了，与缓存文件westos.com.zone.jnl同步####

恢复westos.com.zone文件：

cd /var/named

rm -fr westos.com.zone westos.com.zone.jnl ###将缓存文件和变了的文件删除###

cp -p /mnt/westos.com.zone . ###将之前的文件复制过来###

过程如下：

[[email protected] named]# systemctl restart named

[[email protected] named]# vim /var/named/westos.com.zone

######改变后的文件内容####

$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

[[email protected] 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

[[email protected] named]# vim /var/named/westos.com.zone

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

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

[[email protected] named]# ls

data named.empty slaves westos.com.zone

dynamic named.localhost westos.com.inter

named.ca named.loopback westos.comNaNr

十配置钥匙

服务器：

1 dnssec-keygen -a HMAC-MD5 -b 256 -n HOST westoskey ###产生钥匙，-a指加密方式，-b 指加密字符长度，-n指加密用途，HOST指域名解析,westoskey为钥匙名称###

2 cat Kwestoskey.+157+22331.key

3 cp -p /etc/rndc.key /etc/westos.key ###利用模版要制作配置文件###

4 vim /etc/westos.key

5 vim /etc/named.conf

6 vim /etc/named.rfc1912.zones

7 scp Kwestoskey.+157+23921.* [email protected]:/mnt/ ###把钥匙传给客户端###

客户端：

测试：

nsupdate -k Kwestoskey.+157+23921.private

> server 172.25.254.112

> update add hello.westos.com 86400 A 172.25.254.111

> send

> quit

[[email protected] mnt]# dig hello.westos.com

过程如下：

服务端：

[[email protected] named]# dnssec-keygen --help

dnssec-keygen: invalid argument --

Usage:

dnssec-keygen [options] name

Version: 9.9.4-RedHat-9.9.4-29.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 of an OpenSSL engine to use

-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))

-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 (default: 30 days)

Output:

K<name>+<alg>+<id>.key, K<name>+<alg>+<id>.private

[[email protected] named]# cd /mnt/

[[email protected] mnt]# dnssec-keygen -a HMAC-MD5 -b 128 -n HOST westoskey

Kwestoskey.+157+23921

[[email protected] mnt]# ls

Kwestoskey.+157+23921.key Kwestoskey.+157+23921.private westos.com.zone

[[email protected] mnt]# cat Kwestoskey.+157+23921.key

westoskey. IN KEY 512 3 157 Af69mywNhRB8Vq88kiYpYw==

[[email protected] mnt]# cp -p /etc/rndc.key /etc/westos.key

[[email protected] mnt]# vim /etc/westos.key

[1]+ Stopped vim /etc/westos.key

[[email protected] mnt]# fg

vim /etc/westos.key

[[email protected] mnt]# vim /etc/westos.key

[1]+ Stopped vim /etc/westos.key

[[email protected] mnt]# fg

vim /etc/westos.key

[[email protected] mnt]# vim /etc/named.conf

[[email protected] mnt]# vim /etc/named.rfc1912.zones

[[email protected] mnt]# systemctl restart named

[[email protected] mnt]# scp Kwestoskey.+157+23921.* [email protected]:/mnt/

The authenticity of host ‘172.25.254.212 (172.25.254.212)‘ 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 ‘172.25.254.212‘ (ECDSA) to the list of known hosts.

[email protected]‘s password:

Kwestoskey.+157+23921.key 100% 53 0.1KB/s 00:00

Kwestoskey.+157+23921.private 100% 165 0.2KB/s 00:00

####把钥匙传给客户端###

客户端：

[[email protected] mnt]# nsupdate -k Kwestoskey.+157+23921.private

> server 172.25.254.112

> update add hello.westos.com 86400 A 172.25.254.111

> send

> quit

[[email protected] 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: 33993

;; 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.86400INA172.25.254.112

;; Query time: 0 msec

;; SERVER: 172.25.254.112#53(172.25.254.112)

;; WHEN: Sun May 07 21:14:53 EDT 2017

;; MSG SIZE rcvd: 95

十一 dhcp更新dns

服务端：

1 yum install dhcp -y ###安装dhcp###

2 cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf ##利用模版制作dhcp配置文件###

3 vim /etc/dhcp/dhcpd.conf

内容：

6 option domain-name "westos.com"; ###域名###

7 option domain-name-servers 172.25.254.112; ###dns###

9 default-lease-time 600;

10 max-lease-time 7200;

11 ddns-update-style interim; ###开启dhcp上传数据功能###

12 log-facility local7;

13 subnet 172.25.254.0 netmask 255.255.255.0 {

14 range 172.25.254.180 172.25.254.190; ##分配ip的范围###

15 option routers 172.25.254.250; ###网关####

16 }

17 key westoskey {

18 algorithm hmac-md5;

19 secret Af69mywNhRB8Vq88kiYpYw==;

20 };

21 zone westos.com. {

22 primary 127.0.0.1; ###dns，因为现在dns和dhcp在一台主机上，故用回环接口会提高效率####

23 key westoskey;

24 }

4 systemctl restart dhcpd

5 vim /etc/named.conf

6 systemctl restart named

客户端：

测试：

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

2 hostnamectl set-hostname helo.westos.com

3 vim /etc/resolv.conf

4 dig www.westos.com

过程如下：

服务端：

[[email protected] ~]# yum install dhcp -y

[[email protected] ~]# cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf

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

[[email protected] ~]# vim /etc/dhcp/dhcpd.conf

[[email protected] ~]# cd /mnt/

[[email protected] mnt]# ls

Kwestoskey.+157+23921.key Kwestoskey.+157+23921.private westos.com.zone

[[email protected] mnt]# cat Kwestoskey.+157+23921.key

westoskey. IN KEY 512 3 157 Af69mywNhRB8Vq88kiYpYw==

[[email protected] mnt]# vim /etc/dhcp/dhcpd.conf

[[email protected] mnt]# systemctl restart dhcpd

[[email protected] mnt]# vim /etc/named.conf

[[email protected] mnt]# systemctl restart named

客户端：

[[email protected] ~]# hostname

test.westos.com

[[email protected] ~]# dig test.westos.com

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

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4253

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

;; OPT PSEUDOSECTION:

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

;; QUESTION SECTION:

;test.westos.com.INA

;; ANSWER SECTION:

test.westos.com.300INA172.25.254.180

;; 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: Sun May 07 22:31:20 EDT 2017

;; MSG SIZE rcvd: 94

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