How to iPXE boot from http iso on Leaseweb virtual cloud server

leaseweb custom iso image

Install custom ISO image at leaseweb via iPXE boot in console mode.
Here: Installing freebsd-11.0-RC3

1. press CTRL-B

If your custom iso is not mounting, and your console is at an iPXE shell, you can:

```
dhcp
initrd http://www.dayofdefeat.org/freebsd/mfsbsd-11.0-RELEASE-amd64.iso
```

While the iso is downloading, leaseweb iPXE does not include memdisk, so we have to upload it ourselves to another host.
Here's one I found public, though I wouldn't recommend using it: http://preseed.panticz.de/ipxe/memdisk
After the iso is downloaded and we get back a prompt, we can then:

```
chain http://preseed.panticz.de/ipxe/memdisk iso
```

After boot:
# mkdir /usr/freebsd-dist/
# cd /usr/freebsd-dist/
# fetch http://ftp.de.freebsd.org/pub/FreeBSD/releases/amd64/11.0-RELEASE/MANIFEST
# bsdinstall

Nice to know & workarounds:
- you can't load images via HTTPS
- Error code 2a81800 means image to large > out of memory > use a smaller install image