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This chapter describes how to set up and configure a UEFI HTTP Boot server.
HTTP Boot combines DHCP, DNS, and HTTP to make it possible to boot and deploy systems over the network. HTTP Boot can be used as a high-performance replacement for PXE. HTTP Boot allows to boot a server from a URI over HTTP, quickly transferring large files, such as the Linux kernel and root file system from servers outside of your local network.
Enabling HTTP Boot on a physical client machine depends on your specific hardware. Consult the documentation for further information on how to enable HTTP Boot on your particular machine.
The setup described here uses  |||IP_ADDRESS||| /24 (IPv4) and 2001:db8:f00f:cafe::/64 (IPv6) IP subnets and the server IP addresses are  |||IP_ADDRESS||| (IPv4) and 2001:db8:f00f:cafe::1/64 (IPv6) as examples. Adjust these values to match your specific setup.
Install the following packages on the machine that you plan to use as a HTTP Boot server: dhcp-server, apache2 (or lighttpd), and dnsmasq.
Due to the change in UEFI 2.7, we recommend using a shim bootloader from SLE 15 or newer to avoid potential errors caused by the additional DNS node.
This way, the DHCP servers provide the service on the eth0 interface only.
Note that the DHCPv4 server must use the HTTPClient parameter for the vendor class ID, as the client uses it to identify an HTTP Boot offer.
This configuration defines the type of the boot URL, the vendor class, and other required options. Similar to the DHCPv4 settings, it is necessary to provide the boot URL, which must have an IPv6 address. It is also necessary to specify the vendor class option. In DHCPv6, it consists of the enterprise number and the vendor class data (length and the content). Since the HTTP Boot driver ignores the enterprise number, you can set it to 0. The content of the vendor class data has to be HTTPClient; Otherwise, the client ignores the offer.
Start the dhcpv6 daemon.
In this example, HTTPClient:Arch:00016 refers to a x86_64 HTTP Boot client. This configuration allows the server to serve different architectures simultaneously.
To use the HTTPS Boot, you need to convert an existing server certificate into the DER format and enroll it into the clients firmware.
The exact procedure of enrolling the converted certificate depends on the specific implementation of the clients firmware. For certain hardware, you have to enroll the certificate manually via the firmware UI using an external storage device with the certificate on it. Machines with Redfish support can enroll the certificate remotely. Consult documentation for your specific hardware for more information on enrolling certificates.
Copy CERTIFICATE.pem to the /etc/ssl/private/ directory.
Next, copy the private key and the certificate to the /etc/apache2/ directory.
Replace the http:// prefix with https:// in dhcpd.conf/dhcpd6.conf and restart the dhcp server.
If the firmware already supports HTTP Boot, plug in the cable and choose the correct boot option.
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