Install dnsmasq with: sudo apt install dnsmasq.

This document will briefly describe how to configure dnsmasq to perform both of these roles. There are several implementations of the DHCP/BOOTP and TFTP protocols available. Most DHCP/BOOTP servers can be configured to serve the right bootloader to a particular machine. The difference between UEFI and legacy modes is that in UEFI mode the bootloader is an EFI executable, signed so that is accepted by Secure Boot, and in legacy mode it is PXELINUX.

From this point on the install follows the same path as if the ISO was on a local block device.

The RAM Disk downloads the ISO and mounts it as a loop device.The RAM Disk looks at the kernel command line to learn how to configure the network and where to download the server ISO from.The bootloader downloads configuration, also over TFTP, telling it where to download the kernel, RAM Disk and kernel command line to use.

The machine’s firmware downloads the bootloader over TFTP and executes it.

The DHCP/BOOTP server tells the machine its network configuration and where to get the bootloader.

The to-be-installed machine boots, and is directed to network boot.

The process for network booting the live server installer is similar for both modes and goes like this:

The precise details depend on the system firmware, but both modes usually support the “Preboot eXecution Environment” (PXE) specification, which allows the provisioning of a bootloader over the network. Multi-node configuration with Docker-Composeĭistributed Replicated Block Device (DRBD)Īmd64 systems boot in either UEFI or legacy (“BIOS”) mode (many systems can be configured to boot in either mode).

Setup tftp server ubuntu