93 lines
5.5 KiB
Markdown
93 lines
5.5 KiB
Markdown
# pxetest VM harness
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Proves a new PXE server can be built from this repo, in two libvirt VMs on
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a laptop, without root and without touching a real network.
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## Topology
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| Object | What |
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|-------------------|----------------------------------------------------------------------|
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| `pxetest-imaging` | libvirt network, bridge `virbr-pxetest`. No `<forward>`, no `<ip>`: the host has no address on it and libvirt runs no DHCP there. Only VM taps are on the bridge. |
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| `default` | libvirt NAT, 192.168.122.0/24. Stands in for the GE/corp network. |
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| `pxetest-server` | 2 vCPU, 4 GiB, q35 + OVMF Secure Boot (MS keys), 60G thin qcow2 (`vda`, boot 1), the USB image as a USB disk (`sda`, boot 2). |
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| `pxetest-client` | 2 vCPU, 2 GiB, OVMF Secure Boot (MS keys), 1G blank disk, network boot first (UEFI IPv4 PXE, virtio-net, OVMF driver, no option ROM). Proves shim -> iPXE -> menu -> WinPE under Secure Boot; WinPE has no virtio driver, so it stops at "Waiting for network". |
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| `pxetest-client-nosb` | 2 vCPU, 2 GiB, OVMF without Secure Boot, e1000e NIC, 64G thin SATA disk. WinPE has in-box drivers for both, so startnet gets a network and maps the shares. |
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NIC MACs (fixed):
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| VM | NIC | MAC | Network | Playbook var |
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|--------|---------|---------------------|-------------------|-------------------|
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| server | GE | `52:54:00:9e:10:01` | `default` NAT | `corp_nic_mac` |
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| server | imaging | `52:54:00:9e:10:02` | `pxetest-imaging` | `pxe_nic_mac` |
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| client | - | `52:54:00:9e:10:03` | `pxetest-imaging` | - |
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| client-nosb | - | `52:54:00:9e:10:04` | `pxetest-imaging` | - |
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`build-image.sh` writes `$PXETEST_CACHE/site-vars.yml` with these two
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MACs (`pxe_nic_mac`, `corp_nic_mac`) and passes it to `build-usb.sh
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--site-vars`, so it lands on CIDATA as `playbook/site-vars.yml`. The
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installer brings both NICs up with DHCP; the playbook renames them to
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pxe0 / corp0 and pins pxe0 to 172.16.9.1.
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The disk boots before the USB on purpose: a blank disk falls through to
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the installer, and after the install the server boots its disk instead of
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re-running autoinstall. CIDATA stays attached for the first-boot playbook.
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Never attach a pxetest VM to a physical NIC, a host bridge with physical
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ports, or macvtap: the server's dnsmasq serves DHCP/PXE as 172.16.9.1.
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`create.sh`, `start.sh` and `status.sh` check the isolation and refuse to
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continue if `pxetest-imaging` ever gains a `<forward>`, an `<ip>`, a host
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IPv4 address or a non-tap bridge port.
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## Run it
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export PXETEST_CACHE=~/.cache/pxetest # ISO + image (about 10 GB)
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export PXETEST_PAYLOAD_ROOT=/home/camp/projects/pxe # checkout holding offline-packages/, boot-files/, ...
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export UBUNTU_ISO_NAME=ubuntu-24.04.3-live-server-amd64.iso # optional; default 24.04.5
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tests/vm/fetch-iso.sh # the live-server ISO, SHA256SUMS-verified
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scripts/download-packages.sh --iso "$PXETEST_CACHE/$UBUNTU_ISO_NAME" "$PXETEST_PAYLOAD_ROOT/offline-packages"
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scripts/check-updates.py --debs "$PXETEST_PAYLOAD_ROOT/offline-packages"
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tests/vm/build-image.sh # build-usb.sh --image, upload as volume pxetest-usb.img
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tests/vm/create.sh # network, volumes, both VMs (prints the MAC pins)
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tests/vm/start.sh server # autoinstall, reboot, first-boot playbook
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tests/vm/status.sh --shot /tmp/pxetest-shots # states, leases, screenshots
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tests/vm/start.sh client # once the server playbook is done (Secure Boot client)
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tests/vm/stop.sh client
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tests/vm/start.sh client2 # Secure Boot off, e1000e: WinPE maps the shares
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tests/vm/stop.sh # ACPI shutdown all, keep them defined
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tests/vm/destroy.sh # remove every pxetest-* object
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`build-image.sh` skips enrollment/, bios-staging/, drivers-staging/ and
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boot-tools/ by default; `--with-enrollment` and `--with-boot-tools` add
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them back, `--size 20G` fixes the image size (default `auto`). If the host
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has no `sfdisk` or `mtools`, the debs are extracted into
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`$PXETEST_CACHE/tools` (no install, no root).
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Watch the server with `virt-viewer -c qemu:///system pxetest-server` (VNC on
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127.0.0.1) or screenshots. On the installed system, first-boot output goes
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to `/var/log/first-boot.log`. Once the GE NIC takes a DHCP lease on the NAT
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network, `status.sh` shows its address and `ssh pxe@<address>` works from
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the host.
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The offline package set must be built against the SAME ISO the image is
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built from (download-packages.sh resolves against that ISO's base). For a
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fresh server disk: `tests/vm/destroy.sh`, then build-image.sh, create.sh,
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start.sh server.
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Memory: server 4 GiB + one client 2 GiB (start.sh refuses a second client). Keep other VMs (win11) off while
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both run, and stop them when done.
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Blancco needs more client RAM than 2 GiB: blancco-init downloads its
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~850 MB rootfs into a tmpfs, and at 2 GiB it stops at 48% with "No space
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left on device". To test it within the 6 GiB budget, shrink the server and
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grow the client while both are off, and put them back afterwards:
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virsh -c qemu:///system setmaxmem pxetest-server 2048M --config
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virsh -c qemu:///system setmem pxetest-server 2048M --config
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virsh -c qemu:///system setmaxmem pxetest-client 4096M --config
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virsh -c qemu:///system setmem pxetest-client 4096M --config
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Menu keys from the host: `virsh -c qemu:///system send-key <vm> KEY_DOWN`
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(separator lines are skipped: Down x1 = Blancco, x3 = Clonezilla,
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x4 = Memtest), then KEY_ENTER; startnet answers are KEY_<digit> + KEY_ENTER.
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