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    Linux 配置DNS服务器

参数文件：

/etc/ nsswitch.conf

/etc/resolv.conf

1.配置 /etc/nsswitch.conf

[root@ldbrac1 etc]# cat nsswitch.conf
#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Legal entries are:
#
#       nisplus or nis+         Use NIS+ (NIS version 3)
#       nis or yp               Use NIS (NIS version 2), also called YP
#       dns                     Use DNS (Domain Name Service)
#       files                   Use the local files
#       db                      Use the local database (.db) files
#       compat                  Use NIS on compat mode
#       hesiod                  Use Hesiod for user lookups
#       [NOTFOUND=return]       Stop searching if not found so far
#

# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases
#
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

passwd:     files
shadow:     files
group:      files

#hosts:     db files nisplus nis dns
hosts:      files dns       #默认首选本机hosts 备选DNS

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files    

bootparams: nisplus [NOTFOUND=return] files

ethers:     files
netmasks:   files
networks:   files
protocols:  files
rpc:        files
services:   files

netgroup:   files

publickey:  nisplus

automount:  files
aliases:    files nisplus

[root@ldbrac1 etc]#

2. 配置/etc/resolv.conf

[root@ldbrac1 etc]# cat resolv.conf 
; generated by /sbin/dhclient-script
search askey.com.tw       #网域
nameserver 10.7.46.9     #首选DNS服务器
nameserver 10.7.22.1     #备选DNS服务器

 

 

              AIX配置DNS服务器

参数文件

/etc/netsvc.conf

/etc/resolv.conf          ##如没有可以手动创建

 

1.配置 / etc/netsvc.conf

jupiter:/etc# cat /etc/netsvc.conf

####

##文件最后加上如下语句

hosts  =  local,bind        

 

# bind        Uses BIND/DNS services for resolving names

# local       Searches the local /etc/hosts file for resolving names

# nis         Uses NIS services for resolving names. NIS must be running if you specify this option

当前的搜索顺序是 先本地/etc/hosts文件 之后NIS 然后DNS

2.配置/etc/resolv.conf 

jupiter:/etc# cat resolv.conf

; generated by /sbin/dhclient-script

search askey.com.tw       ##域名

nameserver 10.7.46.9      ##首选DNS服务器

nameserver 10.7.22.1      ##备选DNS服务器

 

3．测试

 

#test rac ldbrac ---xiaofan

#172.16.50.205   ldbrac1.l.com           ldbrac1    ####屏蔽掉hosts文件中映射关系

#172.16.50.206   ldbrac2.l.com           ldbrac2

172.16.50.225   ldbrac1-vip.l.com       ldbrac1-vip

172.16.50.226   ldbrac2-vip.l.com       ldbrac2-vip

"hosts" 115 lines, 4110 characters

jupiter:/etc# ping ldbrac1  #因为DNS中没有ldbrac1主机信息hosts文件也被注释掉 故无法到达

0821-062 ping: host name ldbrac1 NOT FOUND

jupiter:/etc# vi hosts

#test rac ldbrac ---xiaofan

172.16.50.205   ldbrac1.l.com           ldbrac1    #### hosts文件中加入映射关系

172.16.50.206   ldbrac2.l.com           ldbrac2

172.16.50.225   ldbrac1-vip.l.com       ldbrac1-vip

172.16.50.226   ldbrac2-vip.l.com       ldbrac2-vip

jupiter:/etc# ping ldbrac1

PING ldbrac1.l.com: (172.16.50.205): 56 data bytes         ##通过hosts文件解析 可达

64 bytes from 172.16.50.205: icmp_seq=0 ttl=58 time=0 ms

64 bytes from 172.16.50.205: icmp_seq=1 ttl=58 time=1 ms

64 bytes from 172.16.50.205: icmp_seq=2 ttl=58 time=5 ms

###################################

# wms&webdb cluster ip

#10.7.46.13       wmsrac1        wmsrac1.askey.com.tw  ##屏蔽掉该主机映射关系

10.7.46.15       wmsrac2        wmsrac2.askey.com.tw

10.7.46.113      wmsrac1-vip    wmsrac1-vip.askey.com.tw

10.7.46.115      wmsrac2-vip    wmsrac2-vip.askey.com.tw

jupiter:/etc# ping wmsrac1                              ##依然可以通过DNS服务器解析

PING wmsrac1.askey.com.tw: (10.7.46.13): 56 data bytes

64 bytes from 10.7.46.13: icmp_seq=0 ttl=255 time=0 ms

64 bytes from 10.7.46.13: icmp_seq=1 ttl=255 time=0 ms

64 bytes from 10.7.46.13: icmp_seq=2 ttl=255 time=0 ms

jupiter:/etc# nslookup wmsrac1

Server:         10.7.46.9

Address:        10.7.46.9#53

Non-authoritative answer:

Name:   wmsrac1.askey.com.tw

Address: 10.7.46.13

####################################

jupiter:/etc# nslookup MIS041.paskey.corpnet.asus        

###网域内任意主机名 都可以通过DNS服务器解析到

Server:         10.7.46.9

Address:        10.7.46.9#53

Name:   MIS041.paskey.corpnet.asus

Address: 10.7.68.147

jupiter:/etc# ping MIS041.paskey.corpnet.asus

PING MIS041.paskey.corpnet.asus: (10.7.68.147): 56 data bytes

64 bytes from 10.7.68.147: icmp_seq=0 ttl=125 time=0 ms

64 bytes from 10.7.68.147: icmp_seq=1 ttl=125 time=0 ms

64 bytes from 10.7.68.147: icmp_seq=2 ttl=125 time=0 ms

 

 

 

 

 

 

HP-UX 配置DNS服务器

参数文件：

/etc/ nsswitch.conf

/etc/resolv.conf

1.      配置nsswitch.conf文件（如不存在可手动创建内容参照nsswitch.hp_defaults）

sfcstb1:/etc$ cat nsswitch.conf

# example file that could be copied over to /etc/nsswitch.conf; it

# uses NIS (YP) in conjunction with files.

#

passwd:       compat

group:        compat

#hosts:        dns [NOTFOUND=return] files [NOTFOUND=return] nis

#hosts:       dns [NOTFOUND=return] nis [NOTFOUND=return] files  ###default

hosts:        dns [NOTFOUND=continue] files [NOTFOUND=return] nis

ipnodes:      dns [NOTFOUND=return] nis [NOTFOUND=return] files

networks:     nis [NOTFOUND=return] files

protocols:    nis [NOTFOUND=return] files

rpc:          nis [NOTFOUND=return] files

publickey:    nis [NOTFOUND=return] files

netgroup:     nis [NOTFOUND=return] files

automount:    files nis

aliases:      files nis

services:     nis [NOTFOUND=return] files

sfcstb1:/etc$

首选域名解析为DNS 其次选择本地 hosts文件 最后为NIS服务

2.      配置resolv.conf文件（如果没有 则手动创建）

sfcstb1:/etc$ cat resolv.conf

; generated by /sbin/dhclient-script

search askey.com.tw  ##域名

nameserver 10.7.46.9 ##本地首选DNS服务器

nameserver 10.7.22.1 ##本地备选DNS服务器

sfcstb1:/etc$

3.      测试

sfcstb1:/etc$ nslookup wmsrac1

Name Server:  paskeywj-dc2-10.paskey.corpnet.asus

Address:  10.7.46.9

 

Trying DNS

Non-authoritative answer:              ###通过DNS服务器解析到主机名

Name:    wmsrac1.askey.com.tw

Address:  10.7.46.13

 

sfcstb1:/etc$ nslookup ldbrac2

Name Server:  paskeywj-dc2-10.paskey.corpnet.asus

Address:  10.7.46.9

 

Trying DNS           

looking up FILES          ###DNS无法解析 查找到本机hosts文件解析到

Name:    ldbrac2.l.com

Address:  172.16.50.206

Aliases:  ldbrac2

#############################

将/etc/hosts 中ldbrac1 注释掉

#test rac ldbrac ---xiaofan

#172.16.50.205   ldbrac1.l.com           ldbrac1

172.16.50.206   ldbrac2.l.com           ldbrac2

172.16.50.225   ldbrac1-vip.l.com       ldbrac1-vip

172.16.50.226   ldbrac2-vip.l.com       ldbrac2-vip

 

"hosts" 76 lines, 1908 characters

sfcstb1:/etc# nslookup ldbrac1

Name Server:  paskeywj-dc2-10.paskey.corpnet.asus

Address:  10.7.46.9

 

Trying DNS

looking up FILES         ###DNS,本机hosts文件也无法找到 则无法解析

*** No address information is available for "ldbrac1"

sfcstb1:/etc#

#######################################

sfcstb1:/etc# nslookup MIS041.paskey.corpnet.asus

Name Server:  paskeywj-dc2-10.paskey.corpnet.asus

Address:  10.7.46.9

 

Trying DNS                 ###########通过DNS服务器解析网域中任意主机名

Name:    MIS041.paskey.corpnet.asus

Address:  10.7.68.147

#####################################

sfcstb1:/etc# nslookup 9X7EQIJU6688

Name Server:  paskeywj-dc2-10.paskey.corpnet.asus

Address:  10.7.46.9

 

Trying DNS                    ###nslookup 任意未加入网域主机名 无法解析

looking up FILES

*** No address information is available for "9X7EQIJU6688"

 

####################################################################

4.      重新配置nsswitch.conf

sfcstb1:/etc# vi nsswitch.conf

"nsswitch.conf" 18 lines, 726 characters

# example file that could be copied over to /etc/nsswitch.conf; it

# uses NIS (YP) in conjunction with files.

#

passwd:       compat

group:        compat

#hosts:        dns [NOTFOUND=return] files [NOTFOUND=return] nis

#hosts:       dns [NOTFOUND=return] nis [NOTFOUND=return] files  ###default

hosts:        files [NOTFOUND=continue] dns [NOTFOUND=return] nis

####策略 首选本机hosts文件 如果失败则通过DNS服务器解析

ipnodes:      dns [NOTFOUND=return] nis [NOTFOUND=return] files

networks:     nis [NOTFOUND=return] files

protocols:    nis [NOTFOUND=return] files

rpc:          nis [NOTFOUND=return] files

publickey:    nis [NOTFOUND=return] files

netgroup:     nis [NOTFOUND=return] files

automount:    files nis

aliases:      files nis

services:     nis [NOTFOUND=return] files

 

5．测试

  ######################  屏蔽三台主机名在本地hosts文件的映射关系

  10.7.46.4     smtp.local

#10.7.46.13       wmsrac1           ##wmsrac1该主机名存在于DNS服务器上

10.7.46.15       wmsrac2

10.7.46.113      wmsrac1-vip

10.7.46.115      wmsrac2-vip

172.16.51.141    sfc3rac1

172.16.51.142    sfc3rac2

172.16.51.143    sfc3rac1-vip

172.16.51.144    sfc3rac2-vip

 

10.7.46.143      bl460-esx-143.local

172.16.51.167    linuxrac2

#test rac ldbrac ---xiaofan

#172.16.50.205   ldbrac1.l.com           ldbrac1 ##ldbrac1该主机名不存在于DNS服务器

#172.16.50.206   ldbrac2.l.com           ldbrac2

172.16.50.225   ldbrac1-vip.l.com       ldbrac1-vip

172.16.50.226   ldbrac2-vip.l.com       ldbrac2-vip

#############################################

sfcstb1:/etc# nslookup wmsrac1       

Using /etc/hosts on:  sfcstb1

 

looking up FILES         #########首选寻找本机hosts文件 –失败—>通过DNS服务器解析成功

Trying DNS

Non-authoritative answer:

Name:    wmsrac1.askey.com.tw

Address:  10.7.46.13

sfcstb1:/etc# nslookup ldbrac1

Using /etc/hosts on:  sfcstb1

 

looking up FILES       #########首选查找本机hosts文件—失败—通过DNS服务器解析—失败

Trying DNS

*** paskeywj-dc2-10.paskey.corpnet.asus can't find ldbrac1: Non-existent domain

###########################################################

去掉hosts文件中对这三台主机的 注释

10.7.46.13       wmsrac1

10.7.46.15       wmsrac2

10.7.46.113      wmsrac1-vip

10.7.46.115      wmsrac2-vip

172.16.51.141    sfc3rac1

172.16.51.142    sfc3rac2

172.16.51.143    sfc3rac1-vip

172.16.51.144    sfc3rac2-vip

 

10.7.46.143      bl460-esx-143.local

172.16.51.167    linuxrac2

 

#sfc3rc1 sfc3rc2

10.7.46.12       sfc3rc1

10.7.46.14       sfc3rc2

 

#test rac ldbrac ---xiaofan

172.16.50.205   ldbrac1.l.com           ldbrac1

172.16.50.206   ldbrac2.l.com           ldbrac2

172.16.50.225   ldbrac1-vip.l.com       ldbrac1-vip

172.16.50.226   ldbrac2-vip.l.com       ldbrac2-vip

######################################################

sfcstb1:/etc# nslookup wmsrac1

Using /etc/hosts on:  sfcstb1

 

looking up FILES        #####通过首选hosts文件解析

Name:    wmsrac1

Address:  10.7.46.13

 

sfcstb1:/etc# nslookup ldbrac1

Using /etc/hosts on:  sfcstb1

 

looking up FILES       #####通过首选hosts文件解析

Name:    ldbrac1.l.com

Address:  172.16.50.205

Aliases:  ldbrac1

#############################################################

解析本网域内任意主机名

sfcstb1:/etc# nslookup MIS041.paskey.corpnet.asus  

Using /etc/hosts on:  sfcstb1

looking up FILES   ##解析我本机电脑主机名，查找本地hosts文件—失败—通过DNS解析成功

Trying DNS

Name:    MIS041.paskey.corpnet.asus

Address:  10.7.68.147

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