info_tfgrid/collections/farmers/3node_building/2_bootstrap_image.md

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<h1> 2. Create a Zero-OS Bootstrap Image </h1>
<h2> Table of Contents </h2>
- [Introduction](#introduction)
- [Download the Zero-OS Bootstrap Image](#download-the-zero-os-bootstrap-image)
- [Burn the Zero-OS Bootstrap Image](#burn-the-zero-os-bootstrap-image)
- [CD/DVD BIOS](#cddvd-bios)
- [USB Key BIOS+UEFI](#usb-key-biosuefi)
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- [BalenaEtcher - MAC, Linux, Windows](#balenaetcher---mac-linux-windows)
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- [CLI (Linux)](#cli-linux)
- [Rufus (Windows)](#rufus-windows)
- [Additional Information (Optional)](#additional-information-optional)
- [Expert Mode](#expert-mode)
- [Use a Specific Kernel](#use-a-specific-kernel)
- [Disable GPU](#disable-gpu)
- [Bootstrap Image URL](#bootstrap-image-url)
- [Zeros-OS Bootstrapping](#zeros-os-bootstrapping)
- [Zeros-OS Expert Bootstrap](#zeros-os-expert-bootstrap)
***
## Introduction
We will now learn how to create a Zero-OS bootstrap image in order to boot a DIY 3Node.
## Download the Zero-OS Bootstrap Image
Let's download the Zero-OS bootstrap image.
In the Farms section of the Dashboard, click on **Bootstrap Node Image**
![dashboard_bootstrap_farm](./img/dashboard_bootstrap_farm.png)
or use the direct link [https://v3.bootstrap.grid.tf](https://v3.bootstrap.grid.tf):
```
https://v3.bootstrap.grid.tf
```
![Farming_Create_Farm_21](./img/farming_createfarm_21.png)
This is the Zero-OS v3 Bootstrapping page.
![Farming_Create_Farm_22](./img/farming_createfarm_22.png)
Write your farm ID and choose production mode.
![Farming_Create_Farm_23](./img/farming_createfarm_23.png)
If your system is new, you might be able to run the bootstrap in UEFI mode.
![Farming_Create_Farm_24](./img/farming_createfarm_24.png)
For older systems, run the bootstrap in BIOS mode. For BIOS CD/DVD, choose **ISO**. For BIOS USB, choose **USB**
Download the bootstrap image. Next, we will burn the bootstrap image.
## Burn the Zero-OS Bootstrap Image
We show how to burn the Zero-OS bootstrap image. A quick and modern way is to burn the bootstrap image on a USB key.
### CD/DVD BIOS
For the BIOS **ISO** image, download the file and burn it on a DVD.
### USB Key BIOS+UEFI
There are many ways to burn the bootstrap image on a USB key. The easiest way that works for all operating systems is to use BalenaEtcher. We also provide other methods.
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#### BalenaEtcher - MAC, Linux, Windows
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For **MAC**, **Linux** and **Windows**, you can use [BalenaEtcher](https://www.balena.io/etcher/) to load/flash the image on a USB stick. This program also formats the USB in the process. This will work for the option **EFI IMG** for UEFI boot, and with the option **USB** for BIOS boot. Simply follow the steps presented to you and make sure you select the bootstrap image file you downloaded previously.
> Note: There are alternatives to BalenaEtcher (e.g. [usbimager](https://gitlab.com/bztsrc/usbimager/)).
**General Steps with BalenaEtcher:**
1. Download BalenaEtcher
2. Open BalenaEtcher
3. Select **Flash from file**
4. Find and select the bootstrap image (with your correct farm ID)
5. Select **Target** (your USB key)
6. Select **Flash**
That's it. Now you have a bootstrap image on Zero-OS as a bootable removable media device.
#### CLI (Linux)
For the BIOS **USB** and the UEFI **EFI IMG** images, you can do the following on Linux:
sudo dd status=progress if=FILELOCATION.ISO(or .IMG) of=/dev/sd*
Here the * is to indicate that you must adjust according to your disk. To see your disks, write lsblk in the command window. Make sure you select the proper disk!
*If you USB key is not new, make sure that you format it before burning the Zero-OS image.
#### Rufus (Windows)
For Windows, if you are using the "dd" able image, instead of writing command line, you can use the free USB flashing program called [Rufus](https://sourceforge.net/projects/rufus.mirror/) and it will automatically do this without needing to use the command line. Rufus also formats the boot media in the process.
## Additional Information (Optional)
We cover some additional information. Note that the following information is not needed for a basic farm setup.
### Expert Mode
You can use the [expert mode](https://v3.bootstrap.grid.tf/expert) to generate specific Zero-OS bootstrap images.
Along the basic options of the normal bootstrap mode, the expert mode allows farmers to add extra kernel arguments and decide which kernel to use from a vast list of Zero-OS kernels.
#### Use a Specific Kernel
You can use the expert mode to choose a specific kernel. Simply set the information you normally use and then select the proper kernel you need in the **Kernel** drop-down list.
![](./img/bootstrap_kernel_list.png)
#### Disable GPU
You can use the expert mode to disable GPU on your 3Node.
![](./img/bootstrap_disable-gpu.png)
In the expert mode of the Zero-OS Bootstrap generator, fill in the following information:
- Farmer ID
- Your current farm ID
- Network
- The network of your farm
- Extra kernel arguments
- ```
disable-gpu
```
- Kernel
- Leave the default kernel
- Format
- Choose a bootstrap image format
- Click on **Generate**
- Click on **Download**
### Bootstrap Image URL
In both normal and expert mode, you can use the generated URL to quickly download a Zero-OS bootstrap image based on your farm specific setup.
Using URLs can be a very quick and efficient way to create new bootstrap images once your familiar with the Zero-OS bootstrap URL template and some potential varations.
```
https://<grid_version>.bootstrap.grid.tf/<image_format>/<network>/<farm_ID>/<arg1>/<arg2>/.../<kernel>
```
Note that the arguments and the kernel are optional.
The following content will provide some examples.
#### Zeros-OS Bootstrapping
On the [main page](https://v3.bootstrap.grid.tf/), once you've written your farm ID and selected a network, you can copy the generated URL of any given image format.
For example, the following URL is a download link to an **EFI IMG** of the Zero-OS bootstrap image of farm 1 on the main TFGrid v3 network:
```
https://v3.bootstrap.grid.tf/uefimg/prod/1
```
#### Zeros-OS Expert Bootstrap
You can use the generated sublink at the **Generate step** of the expert mode to get a quick URL to download your bootstrap image.
- After setting the parameters and arguments, click on **Generate**
- Add the **Target** content to the following URL `https://v3.bootstrap.grid.tf`
- For example, the following URL sets an **ipxe** script of the Zero-OS bootstrap of farm 1 on the main TFGrid v3 network, with the **disable-gpu** function enabled as an extra kernel argument and a specific kernel:
- ```
https://v3.bootstrap.grid.tf/ipxe/test/1/disable-gpu/zero-os-development-zos-v3-generic-b8706d390d.efi
```