CentOS 7
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Dnsmasq : Install
2016/08/31
 
Install Dnsmasq which is the lightweight DNS forwarder and DHCP Server Software.
[1] Install Dnsmasq.
[root@dlp ~]#
yum -y install dnsmasq
[2] Configure Dnsmasq.
[root@dlp ~]#
vi /etc/dnsmasq.conf
# line 19: uncomment (never forward plain names)

domain-needed
# line 21: uncomment (never forward addresses in the non-routed address spaces)

bogus-priv
# line 41: uncomment (query with each server strictly in the order in resolv.conf)

strict-order
# line 55: add if you need

# query the specific domain name to the specific DNS server

# the example follows means query [server.education] domain to the [10.0.0.10] server

server=/server.education/10.0.0.10
# line 123: uncomment (add domain name automatically)

expand-hosts
# line 133: add (define domain name)

domain=srv.world
[root@dlp ~]#
systemctl start dnsmasq

[root@dlp ~]#
systemctl enable dnsmasq

[3] For DNS records, add them in /etc/hosts.
Then, Dnsmasq will answer to queries from clients.
[root@dlp ~]#
vi /etc/hosts 
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
# add records
10.0.0.30   dlp.srv.world dlp
[root@dlp ~]#
systemctl restart dnsmasq

[4] If Firewalld is running, allow DNS service.
[root@dlp ~]#
firewall-cmd --add-service=dns --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
[5] Verify to resolve Name or IP address from a client in internal network.
[root@desktop ~]#
yum -y install bind-utils
# change DNS setting to Dnsmasq Server (replace "ens3" to your own environment)

[root@desktop ~]#
nmcli c modify ens3 ipv4.dns 10.0.0.30

[root@desktop ~]#
nmcli c down ens3; nmcli c up ens3
[root@desktop ~]#
dig dlp.srv.world. 


; <<>> DiG 9.9.4-RedHat-9.9.4-29.el7_2.3 <<>> dlp.srv.world
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11613
;; flags: qr aa rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dlp.srv.world.                 IN      A

;; ANSWER SECTION:
dlp.srv.world.          0       IN      A       10.0.0.30

;; Query time: 2 msec
;; SERVER: 10.0.0.30#53(10.0.0.30)
;; WHEN: Wed Aug 31 17:22:51 JST 2016
;; MSG SIZE  rcvd: 47
[root@desktop ~]#
dig -x 10.0.0.30 


; <<>> DiG 9.9.4-RedHat-9.9.4-29.el7_2.3 <<>> -x 10.0.0.30
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61937
;; flags: qr aa rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;30.0.0.10.in-addr.arpa.                IN      PTR

;; ANSWER SECTION:
30.0.0.10.in-addr.arpa. 0       IN      PTR     dlp.srv.world.

;; Query time: 3 msec
;; SERVER: 10.0.0.30#53(10.0.0.30)
;; WHEN: Wed Aug 31 17:24:00 JST 2016
;; MSG SIZE  rcvd: 67
 
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