Document URL: https://docs.openshift.com/container-platform/4.1/installing/installing_bare_metal/installing-bare-metal.html#installation-user-infra-machines-pxe_installing-bare-metal

Section Number and Name: iPXE kernel arguments

Describe the issue: 
During the bootstrapping from iPXE to RHCOS, an error message is shown such as:

Failed to open file: http:\\the-server:8080\rhcos-4.1.0-x86_64-installer-initramfs.img

Suggestions for improvement: 
The `initrd` argument is treated as a file and not a URL.  iPXE has already downloaded rhcos-4.1.0-x86_64-installer-initramfs.img.  Setting `initrd=rhcos-4.1.0-x86_64-installer-initramfs.img` allows the installation to progress.

Additional information: 

[not working] -
kernel http://the-server:8080/rhcos-4.1.0-x86_64-installer-kernel ip=dhcp rd.neednet=1 initrd=http://the-server:8080/rhcos-4.1.0-x86_64-installer-initramfs.img console=tty0 console=ttyS0 coreos.inst=yes coreos.inst.install_dev=sda coreos.inst.image_url=http://the-server:8080/rhcos-4.1.0-x86_64-metal-uefi.raw.gz coreos.inst.ignition_url=http://the-server:8080/dist/rhcos/ign/bootstrap.ign
initrd http://the-server:8080/rhcos-4.1.0-x86_64-installer-initramfs.img

[working] -
kernel http://the-server:8080/rhcos-4.1.0-x86_64-installer-kernel ip=dhcp rd.neednet=1 initrd=rhcos-4.1.0-x86_64-installer-initramfs.img console=tty0 console=ttyS0 coreos.inst=yes coreos.inst.install_dev=sda coreos.inst.image_url=http://the-server:8080/rhcos-4.1.0-x86_64-metal-uefi.raw.gz coreos.inst.ignition_url=http://the-server:8080/dist/rhcos/ign/bootstrap.ign
initrd http://the-server:8080/rhcos-4.1.0-x86_64-installer-initramfs.img