FROM ubuntu:20.04 as ubuntu_focal LABEL Description="ubuntu intermediate image" LABEL Version="2.0" RUN apt update \ && apt install -y wget genisoimage syslinux-common \ && mkdir -p /var/lib/tftpboot/grub \ && mkdir -p /var/lib/tftpboot/casper/ubuntu-focal-amd64/ \ && mkdir -p /var/lib/tftpboot/casper/ubuntu-focal-arm64/ ENV ISO_FOCAL_AMD64 https://releases.ubuntu.com/20.04.2/ubuntu-20.04.2-live-server-amd64.iso ENV ISO_FOCAL_ARM64 https://cdimage.ubuntu.com/releases/20.04/release/ubuntu-20.04.2-live-server-arm64.iso ENV EFI_FOCAL_AMD64 http://archive.ubuntu.com/ubuntu/dists/focal/main/uefi/grub2-amd64/current/grubnetx64.efi.signed ENV EFI_FOCAL_ARM64 http://ports.ubuntu.com/ubuntu-ports/dists/focal/main/uefi/grub2-arm64/current/grubnetaa64.efi.signed RUN echo "Preparing Grub EFI Binary" \ && wget $EFI_FOCAL_AMD64 -O /var/lib/tftpboot/grub/grubnetx64.efi.signed \ && wget $EFI_FOCAL_ARM64 -O /var/lib/tftpboot/grub/grubnetaa64.efi.signed RUN echo "Preparing Casper Kernel" \ && wget $ISO_FOCAL_AMD64 -O /ubuntu-20.04.2-live-server-amd64.iso \ && isoinfo -i /ubuntu-20.04.2-live-server-amd64.iso -x "/CASPER/INITRD.;1" > /var/lib/tftpboot/casper/ubuntu-focal-amd64/initrd \ && isoinfo -i /ubuntu-20.04.2-live-server-amd64.iso -x "/CASPER/VMLINUZ.;1" > /var/lib/tftpboot/casper/ubuntu-focal-amd64/vmlinuz\ && wget $ISO_FOCAL_ARM64 -O /ubuntu-20.04.2-live-server-arm64.iso \ && isoinfo -i /ubuntu-20.04.2-live-server-arm64.iso -x "/CASPER/INITRD.;1" > /var/lib/tftpboot/casper/ubuntu-focal-arm64/initrd \ && isoinfo -i /ubuntu-20.04.2-live-server-arm64.iso -x "/CASPER/VMLINUZ.;1" > /var/lib/tftpboot/casper/ubuntu-focal-arm64/vmlinuz FROM alpine LABEL Description="dnsmasq service image" LABEL Version="2.0" RUN apk add --update --no-cache dnsmasq \ && rm -rf /var/cache/apk/* # Extract installer from previous image. COPY --from=ubuntu_focal /var/lib/tftpboot /var/lib/tftpboot # Configure PXE. COPY tftpboot/ /var/lib/tftpboot/ # Configure DNSMASQ. COPY etc/ /etc/ # Start dnsmasq. It picks up default configuration from /etc/dnsmasq.conf and # /etc/default/dnsmasq plus any command line switch ENTRYPOINT ["sh","-c","dnsmasq","--interface=$E_INT","--listen-address=$E_ADD"]