dnsmasq

guide by example

Purpose

Lightweight DHCP and DNS server.

Files and directory structure

/etc/
└── dnsmasq.conf

Installation

Install dnsmasq from your linux official repos.
configuration
enable and start the service
sudo systemctl enable --now dnsmasq

Configuration

Configuration file location: /etc/dnsmasq.conf

dnsmasq.conf

# dont use resolv.conf as it gets changed by DHCP
resolv-file=/etc/resolv.conf.dnsmasq

# DHCP netmask
# CLients get 255.255.255.0 as netmask
dhcp-option=1,255.255.255.0

# default gateway
# clients get  192.168.1.251 as gateway
dhcp-option=3,192.168.1.69

# dns
# clients get 192.168.1.69 as DNS (this is the IP of the Pi itself)
dhcp-option=6,192.168.1.69


#you can assign fixed ip adresses to hosts based on mac address
dhcp-host=ma:ca:dr:e:ss:00,mycomp192.168.1.1,12h


# all hosts not identified by mac get a dynamic ip out of this range:
dhcp-range=192.168.1.120,192.168.1.200,12h

resolv.conf

Edit /etc/resolv.conf to send all requests to dnsmasq, then prevent c

nameserver 127.0.0.1

Then make it immutable to prevent other services from making changes to it

chattr +i /etc/resolv.conf

/etc/hosts

dnsmasq reads all the DNS hosts and names from the /etc/hosts file, so add your DNS hosts IP addresses and name pairs as shown.

127.0.0.1 dnsmasq 192.168.56.10 dnsmasq 192.168.56.1 gateway 192.168.56.100 maas-controller 192.168.56.20 nagios 192.168.56.25 webserver1

Update

watchtower updates the image automaticly
manual image update
docker-compose pull
docker-compose up -d
docker image prune

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