HOWTO: Installing ESX Server from a USB flash drive

After Mike Laverick posted his experience with ESX Server and USB flash disks in another thread, I decided to figure out how to make it work.

Here's a quick rundown on setting up a USB flash disk (ie. pen drive, flash key, etc.) to install ESX Server.

Requirements:

\- You will need at least a 1 GB USB flash disk.

\- You must have

both

the ESX 3.x CD-ROM and ISO image handy.


\- You will need an ISO image extraction tool such as WinISO, MagicISO, or even WinRAR.


\- You'll need SYSLINUX, a Linux boot loader for removable media. Get it here:





http://www.kernel.org/pub/linux/utils/boot/syslinux/syslinux-3.36.zip





\- These instructions are based on a Windows PC for simplicity. If you're a Linux guru, then you can obviously do this under Linux. You'd need to know how to mount .ISO images in order to extract files, etc.

Steps Required:

1. Plug in your USB flash disk and format it under Windows. Use the FAT filesystem (not FAT32, although it would probably work).



2. From Windows Explorer, find the

boot.iso

file in the

/images

directory on the ESX 3.x CD-ROM. Copy

boot.iso

into a temporary directory on your hard drive.






3. Using your ISO extraction program of choice, extract the contents of the

boot.iso

file to your USB flash drive. On my PC, it's the

E:

drive.




4. Delete the

isolinux.bin

and

updatecd.cfg

files from the USB flash disk.



5. Rename the

isolinux.cfg

file on the USB flash disk to

syslinux.cfg

6. Using WordPad (not Notepad), open the

syslinux.cfg

file and add the keyword usbto the end of every line that begins with

append

. Here's what the file should look like when you're done:



default esx

prompt 1

timeout 600

display boot.msg

F1 boot.msg

F7 snake.msg

label debug

kernel vmlinuz

append initrd=initrd.img noapic nomediacheck debug usb

label esx

kernel vmlinuz

append initrd=initrd.img usb

label text

kernel vmlinuz

append initrd=initrd.img text usb

label expert

kernel vmlinuz

append expert initrd=initrd.img usb

label ks

kernel vmlinuz

append ks initrd=initrd.img usb

label lowres

kernel vmlinuz

append initrd=initrd.img lowres usb



7. Now, extract the

syslinux

.zip file into another temporary directory on your hard drive.



8. Open up a command prompt and use the

cd

command to navigate into the

win32

directory. For example:

 

cd C:\temp\syslinux-3.36\win32</p>

 

9. Now, run the syslinux program to apply the boot loader and boot sector to the USB flash drive:</p>

 

syslinux -s e:


( On my PC, my USB flash drive is mounted as drive E: )



10. Finally, copy the ESX 3.x ISO image onto the flash drive:



+copy c:\iso\esx-3.0.1-32039.iso e:\ +



11. Confirm that your USB flash drive contains the following files:



boot.cat

boot.msg

initrd.img

snake.msg

splash.lss

vmlinuz

syslinux.cfg

esx-3.0.1-32039.iso



12. You're all set! Unplug the USB flash drive, configure the BIOS on your server to boot from USB accordingly, and boot 'er up!



13. The ESX installer will detect the USB device and whatever SCSI / disk controllers you have. When the installer asks you what the installation source will be, choose

Hard Disk

.



14. You will need to choose the right disk device (ie. /dev/sda, /dev/sdb) that corresponds to your USB flash disk. Chances are it will be /dev/sdb.



15. Finally, the installer will ask you what directory to find the ESX installation CD image in. Just use / and it will find the .ISO image for you.



16. The rest is history!



Please let me know how this works for you and if you run into any glitches. This is going to save me a lot of time since I don't have CD-ROM drives in all of my servers!!

Paul