Dnsmasq is an easy to configure and lightweight DHCP Server and DNS forwarder. Dnsmasq is designed primarily to provide DNS service and optionally, DHCP, in a small network setup. The DHCP server in Dnsmasq integrates with the DNS server seamlessly. The machines with IP addresses allocated by DHCP server appear in the DNS with names configured either in each host or in a central configuration file.
Dnsmasq support dynamic and static DHCP leases. On top of stated features it has support for BOOTP/TFTP which can be used for network booting of diskless machines. Dnsmasq can be used in Proxmox virtualization platform to assign IP addresses dynamically or statically, and also to manage DNS. We’ll run Dnsmasq in one Proxmox hypervisor, with the service bound to specific network interface / bridge.
Step 1: Install dnsmasq on Proxmox VE 6.x
I’ll install dnsmasq in one Proxmox hypervisor from the default upstream repositories.
sudo apt update sudo apt install dnsmasq
Proceed to install dnsmasq on Proxmox VE 6.x
Reading state information... Done The following additional packages will be installed: dns-root-data dnsmasq-base Suggested packages: resolvconf The following NEW packages will be installed: dns-root-data dnsmasq dnsmasq-base 0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded. Need to get 463 kB of archives. After this operation, 1,027 kB of additional disk space will be used. Do you want to continue? [Y/n] y
Also install dnsutils package which provides dig command:
sudo apt install dnsutils -y
Test your installation:
$ dig computingpost.com @localhost nslookup computingpost.com localhost
The DNS function in Dnsmasq is configured to forward all requests to your system’s default DNS settings as configured in /etc/resolv.conf file.
Step 2: Configure DHCP Server using Dnsmasq
After successful installation of Dnsmasq on your Proxmox server you can the start to configure DHCP service.
sudo vim /etc/dnsmasq.conf
Set domain for dnsmasq:
Let dnsmasq know which ethernet interface it will use to listen for DHCP requests:
#Around line 106 interface=vmbr1 # Or which to listen on by address (remember to include 127.0.0.1 if you use this.) #listen-address=
Set DHCP server range of IP addresses to hand out.
#around line 159 dhcp-range=192.168.50.50,192.168.50.200,12h
Set default route supplied by dnsmasq:
#around line 337 dhcp-option=vmbr1,3,192.168.50.1 #dhcp-option=eth0,3,192.168.50.1
Provide upstream DNS servers:
#line 66 # You can use Google's open DNS servers server=18.104.22.168 server=22.214.171.124
Set path to a file for the DHCP lease database:
Test your configurations:
$ sudo dnsmasq --test dnsmasq: syntax check OK.
Restart dnsmasq service:
sudo systemctl restart dnsmasq sudo systemctl enable dnsmasq
Step 3: Create a VM on the network with DHCP service
Create a new Virtual Machine from Proxmox web console.
Let’s give it a name and choose node where it will run.
Select OS installation disc.
Pick correct network (should be same as one used in dnsmasq DHCP configurations)
Install the operating system and once completed reboot and check IP address if from DHCP.
If the interface didn’t get IP address assigned by DHCP server automatically you can try manual request:
sudo dhclient interface
That marks the end of our article. Feel free to share your setup and test results via comments section.