example /usr/local/etc/dnsmasq.conf

dnsmasq.conf

#
# Basic server configuration
#

listen-address=127.0.0.1
port=53
bind-interfaces
cache-size=1000

#
# Logging
#

# Debug only
# log-facility=/usr/local/var/log/dnsmasq.log
# log-queries

#
# Name resolution options
#

# By  default,  dnsmasq  will  send queries to any of the upstream servers 
strict-order

# get upstream servers from somewhere other that /etc/resolv.conf
resolv-file=/usr/local/etc/resolv.dnsmasq.conf

# don't read /etc/resolv.conf or any other file, getting its servers from this file instead
#no-resolv

# don't poll /etc/resolv.conf or other resolv files for changes and re-read them
#no-poll

# force dnsmasq to send queries to all servers
#all-servers

# don't read /etc/hosts
#no-hosts


# Include all files in a directory which end in .conf
conf-dir=/usr/local/etc/dnsmasq.d/,*.conf

https://serverfault.com/questions/706516/how-long-does-dnsmasq-cache-dns

http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html

https://www.andrewoberstar.com/blog/2012/12/30/raspberry-pi-as-server-dns-and-dhcp