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92 lines
2.0 KiB
Markdown
92 lines
2.0 KiB
Markdown
4 years ago
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# dnsmasq
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###### guide by example
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# Purpose
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Lightweight DHCP and DNS server.
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* [Official site](http://www.thekelleys.org.uk/dnsmasq/doc.html)
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* [Arch wik](https://wiki.archlinux.org/index.php/dnsmasq)
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# Files and directory structure
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```
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/etc/
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└── dnsmasq.conf
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```
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# Installation
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* Install dnsmasq from your linux official repos.
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* configuration
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* enable and start the service</br>
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`sudo systemctl enable --now dnsmasq`
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# Configuration
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Configuration file location: /etc/dnsmasq.conf
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`dnsmasq.conf`
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```bash
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# dont use resolv.conf as it gets changed by DHCP
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resolv-file=/etc/resolv.conf.dnsmasq
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# DHCP netmask
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# CLients get 255.255.255.0 as netmask
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dhcp-option=1,255.255.255.0
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# default gateway
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# clients get 192.168.1.251 as gateway
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dhcp-option=3,192.168.1.69
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# dns
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# clients get 192.168.1.69 as DNS (this is the IP of the Pi itself)
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dhcp-option=6,192.168.1.69
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#you can assign fixed ip adresses to hosts based on mac address
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dhcp-host=ma:ca:dr:e:ss:00,mycomp192.168.1.1,12h
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# all hosts not identified by mac get a dynamic ip out of this range:
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dhcp-range=192.168.1.120,192.168.1.200,12h
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```
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# resolv.conf
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Edit /etc/resolv.conf to send all requests to dnsmasq, then prevent c
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* `nameserver 127.0.0.1`
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Then make it immutable to prevent other services from making changes to it
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* `chattr +i /etc/resolv.conf`
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# /etc/hosts
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dnsmasq reads all the DNS hosts and names from the /etc/hosts file,
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so add your DNS hosts IP addresses and name pairs as shown.
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127.0.0.1 dnsmasq
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192.168.56.10 dnsmasq
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192.168.56.1 gateway
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192.168.56.100 maas-controller
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192.168.56.20 nagios
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192.168.56.25 webserver1
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# Update
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* [watchtower](https://github.com/DoTheEvo/selfhosted-apps-docker/tree/master/watchtower)
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updates the image automaticly
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* manual image update</br>
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`docker-compose pull`</br>
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`docker-compose up -d`</br>
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`docker image prune`
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