openness configure dns server

Prepare:

详解 DNS 与 CoreDNS 的实现原理

调查

采用什么来搭建一个dns server？

1. BIND

Learn how to use BIND to set up your own server for resolving domain names.

How to Install and Configure DNS Server in Linux

2. Dnsmasq (dnsmasq - archlinux)

Consul, DNS and Dnsmasq

experience

Create a Home Network DNS Server Using DNSMasq

How to Setup a DNS/DHCP Server Using dnsmasq on CentOS/RHEL 8/7

Use dnsmasq to provide DNS & DHCP services

Dnsmasq setup

# https://somoit.net/linux/configure-simple-dns-server
# https://oracle-base.com/articles/linux/dnsmasq-for-simple-dns-configurations
# https://www.tecmint.com/setup-a-dns-dhcp-server-using-dnsmasq-on-centos-rhel/
yum install dnsmasq -y
yum install bind-utils -y


mkdir -p ~/dnsmasq

DNSP=$(realpath ~/dnsmasq)
IFC=$(ip route get 1 | awk '{match($0, /.+dev\s([A-Za-z.0-9]+)/, a);print a[1];exit}')
IP=$(ip route get 1 | awk '{match($0, /.+src\s([.0-9]+)/, a);print a[1];exit}')
DHCP_R=10.10.10.2,10.10.10.192

configure

echo "192.168.127.10  test.host.openness.com" > $DNSP/dns.addnhosts

cat << EOF > $DNSP/dnsmasq.conf
#/etc/dnsmasq.conf
##WARNING:  THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
##OVERWRITTEN AND LOST.  Changes to this configuration should be made using:
##    virsh net-edit ansible_cloud
## or other application using the libvirt API.
##
## dnsmasq conf file created by libvirt
strict-order
pid-file=${DNSP}/dnsmasq.pid
except-interface=lo
bind-dynamic
interface=$IFC
dhcp-range=$DHCP_R
dhcp-no-override
dhcp-authoritative
dhcp-lease-max=191
dhcp-hostsfile=${DNSP}/dhcp.hostsfile
addn-hosts=${DNSP}/dns.addnhosts
# --
# domain-needed
# bogus-priv
# expand-hosts
#
# # The address 192.168.0.176 is the static IP of this server
# # You can find this ip by running ifconfig and look for the
# # IP of the interface which is connected to the router.
# listen-address=127.0.0.1
# listen-address=192.168.0.176
# bind-interfaces
#
# # Use open source DNS servers
# server=8.8.8.8
# server=8.8.4.4
# server=208.67.220.220
#
# # Create custom 'domains'.
# # Custom 'domains' can also be added in /etc/hosts
# address=/busyserver.net/192.168.0.176
EOF

start

/usr/sbin/dnsmasq --conf-file=$DNSP/dnsmasq.conf --leasefile-ro

validation

IP=$(ip route get 1 | awk '{match($0, /.+src\s([.0-9]+)/, a);print a[1];exit}')
dig @$IP test.host.openness.com

restart

DNSP=$(realpath ~/dnsmasq)
pkill dnsmasq
/usr/sbin/dnsmasq --conf-file=$DNSP/dnsmasq.conf --leasefile-ro
ps -ef | grep dnsmasq

or just sed a SIGHUB to reload configure

Kill Command in Linux

kill -HUP $(pidof dnsmasq)

# or
kill -SIGHUP $(pidof dnsmasq)

# or 
kill -1 $(pidof dnsmasq)

add a new host entry

Linux – Simple DNS server using DNSmasq

echo "192.168.100.117      testhost.mydomain.com testhost" >>  /etc/hosts

specified dsn host files

DNSP=$(realpath ~/dnsmasq)
pkill dnsmasq

/usr/sbin/dnsmasq --conf-file=$DNSP/dnsmasq.conf --leasefile-ro --addn-hosts=$DNSP/dns.addnhosts

ps -ef | grep dnsmasq

still can not works, what's wrong? other sample configrue

can works by "--address"

/usr/sbin/dnsmasq --conf-file=$DNSP/dnsmasq.conf --leasefile-ro --addn-hosts=$DNSP/dns.addnhosts --address=/test.host.openness.com/192.168.127.10

default setting

cat /usr/lib/systemd/system/dnsmasq.service
[Unit]
Description=DNS caching server.
After=network.target

[Service]
ExecStart=/usr/sbin/dnsmasq -k

[Install]
WantedBy=multi-user.target

REF: