# Configure Host for UEFI

Unified Extensible Firmware Interface (UEFI) is a standard firmware designed to replace BIOS. By default, a VM instance boots in BIOS mode.

PMO has experimental support for UEFI based instance booting on the following host operating systems.

* Ubuntu 16.04
* CentOS 7.4 and higher

UEFI facilitates faster boot, supports larger hard drives, and has more security features as compared to the traditional BIOS.

You can configure an authorized host or hypervisor to boot in UEFI mode.

Open Virtual Machine Firmware (OVMF) is a project to enable UEFI support for virtual machines. OVMF must be installed on your host to enable UEFI mode booting for virtual machines.

The following sections explain how to install OVMF on CentOS and Ubuntu. Refer to the respective section based on your host operating system, verify UEFI installation on your VM, and configure images to boot with UEFI.

## Install OVMF on Host running CentOS

1\. Follow the steps given below to install OVMF on CentOS.

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```bash
cd /etc/yum.repos.d/ && wget http://www.kraxel.org/repos/firmware.repo
```

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2\. Run the following command to install OVMF for 64-bit.

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```bash
su -c 'yum install edk2.git-ovmf-x64 -y'
```

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3\. Create a new directory by the name OVMF in the /usr/share directory and copy the OVMF\_CODE-pure-efi.fd and OVMF\_ VARS-pure-efi.fd as shown in the following commands.

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```bash
mkdir -p /usr/share/OVMF/
  cp /usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd /usr/share/OVMF/OVMF_CODE.fd
  cp /usr/share/edk2.git/ovmf-x64/OVMF_VARS-pure-efi.fd /usr/share/OVMF/OVMF_VARS.fd
```

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## Install OVMF on Host running Ubuntu

Run the following command to install OVMF on Ubuntu.

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```bash
apt-get install ovmf
```

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## Verify that your Virtual Machine is booted in UEFI mode

Look for the `/sys/firmware/efi` folder on your virtual machine (VM). The folder would be missing if your VM is using BIOS.

Alternatively, install the efibootmgr package and check if your VM has been booted with UEFI.

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```bash
sudo apt install efibootmgr
sudo efibootmgr
```

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If your VM is booted with UEFI, the output of the `sudo efibootmgr` command shows different EFI variables.

If your VM does not support UEFI, a message is displayed in the output of the `sudo efibootmgr` command indicating that EFI variables are not supported.

## Configure Image to Boot using UEFI

Add `hw_firmware_type` image metadata to the UEFI image to specify UEFI as the firmware type used to boot the instance.

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```bash
openstack image set --property hw_firmware_type=uefi <image UUID>
```

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