Difference between revisions of "Install LVM LUKS on UEFI GPT"

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     └─void-home                      ext4              c7c0ff55-6b8e-4fdd-b05f-ccbae4c54227
 
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The UUID of your boot partition should be 9 characters long in the format XXXX-XXXX with X being random characters. The boot UUID in this example is "6EF3-45A2". If you're still having difficulty discerning which partition is boot, it's probably 'sda1'.
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The UUID of your boot partition should be 9 characters long in the format XXXX-XXXX with X being random characters. The boot UUID in this example is "6EF3-45A2". If you're still having difficulty discerning which partition is boot, it's probably the UUID for 'sda1'.
  
 
Then, edit your /etc/fstab file to look like this:
 
Then, edit your /etc/fstab file to look like this:

Revision as of 22:41, 4 May 2019

This guide describes how to install Void Linux on a UEFI system with root over encrypted LVM.

Introduction

Warning: If you do not boot from UEFI mode, the bootloader installation will fail!

To follow this guide, first you need to boot from a Linux live CD/USB of your choice in UEFI mode.

For UEFI boot, the disk needs to be GPT partitioned and an EFI System Partition (ESP) must be present. The size of the ESP must be at least 260M or more, type EF00, and formatted with FAT32.

This partition will serve as your /boot filesystem as well as the partition that the UEFI firmware can read to load the bootloader.

From now on, /dev/sda1 will be the ESP (/boot) and /dev/sda2 will be the encrypted partition with LVM.

Installation

Preparing the disk

The first step is to use gdisk (or cgdisk) to create the GPT partitions:

# gdisk /dev/sda
Note: You can also use fdisk or cfdisk (needs util-linux 2.25 or newer)

Encrypting the partition

We will encrypt the entire /dev/sda2 partition and then unlock the container to start setting up LVM:

# cryptsetup luksFormat /dev/sda2 
# cryptsetup luksOpen /dev/sda2 crypt

The decrypted container will be now available at /dev/mapper/crypt.

You can view the dm-crypt documentation on the Arch Wiki for more settings when using luksFormat.

Warning: The default keyboard layout is us. If you enter the passphrase using a different keymap, you likely won't be able to unlock your crypted volume.

Creating logical volumes

First, we will create a physical volume on top of the opened LUKS container and a volume group, named void. Then, we will setup the logical volumes on the volume group. The partition scheme is defined as follows:

swap 2G (optional)
/ 20G
/home the remaining free space
Note: The above partitioning scheme is an example. Please, change it to suit your needs.
# pvcreate /dev/mapper/crypt
# vgcreate void /dev/mapper/crypt
# lvcreate -C y -L 2G -n swap void (optional)
# lvcreate -L 20G -n root void
# lvcreate -l 100%FREE -n home void

Creating filesystems and mounting the partitions

The ESP must be formatted in FAT32. The root and home partitions are formatted using the ext4 filesystem.

The root partition is mounted on /mnt, while the ESP is on /mnt/boot.

# mkfs.fat -F32 /dev/sda1
# mkfs.ext4 /dev/mapper/void-root
# mkfs.ext4 /dev/mapper/void-home
# mount /dev/mapper/void-root /mnt
# mkdir /mnt/boot
# mount /dev/sda1 /mnt/boot

If you have created a swap partition, then you have to format and activate it:

# mkswap /dev/mapper/void-swap
# swapon /dev/mapper/void-swap

Install the base system

If doing this from a Void live CD or any Void system

# xbps-install -S --repository=https://alpha.de.repo.voidlinux.org/current -r /mnt base-system lvm2 cryptsetup grub-x86_64-efi

You may also wish to install any other packages here that you want to use during installation, like nano, if you'd rather not use vi to edit files.

From any other Linux

# wget https://alpha.de.repo.voidlinux.org/static/xbps-static-latest.x86_64-musl.tar.xz
# tar xf xbps-static-latest.x86_64-musl.tar.xz -C /mnt
# /mnt/usr/bin/xbps-install -S --repository=https://alpha.de.repo.voidlinux.org/current -r /mnt base-system lvm2 cryptsetup grub-x86_64-efi

Chroot into Void

Now that the base system is installed, it's time to enter our new Void Linux environment by chrooting into it:

# mkdir /mnt/{dev,proc,sys}
# mount -t proc /proc /mnt/proc
# mount --rbind /dev /mnt/dev
# mount --rbind /sys /mnt/sys
# chroot /mnt /bin/bash

Configure the base system

1. Set the root password:

# passwd root

2. Make sure files have proper ownership and permissions:

# chown root:root /
# chmod 755 /

3. Edit the Void system configuration file:

# vi /etc/rc.conf

4. Tell your system where its partitions are:

First, get the UUID of your boot partition with the command

# lsblk -f

Here is an example output of the previous command:

NAME                                  FSTYPE      LABEL UUID                                   FSAVAIL FSUSE% MOUNTPOINT
sda                                                                                                           
├─sda1                                vfat              6EF3-45A2
└─sda2                                crypto_LUKS       01a173cc-f5aa-4e27-92cd-367804916283 
  └─luks-01a173cc-f5aa-4e27-92cd-367804916283
                                      LVM2_member       dNp93t-tOSD-EYI3-2Tuc-elLn-XSf3-XcJfl5                
    ├─void-swap                       swap              8521b8ce-5471-408c-9850-f53e74f4481f
    ├─void-root                       ext4              7fb48cd9-2f72-41e4-a841-c66f27c508fc
    └─void-home                       ext4              c7c0ff55-6b8e-4fdd-b05f-ccbae4c54227

The UUID of your boot partition should be 9 characters long in the format XXXX-XXXX with X being random characters. The boot UUID in this example is "6EF3-45A2". If you're still having difficulty discerning which partition is boot, it's probably the UUID for 'sda1'.

Then, edit your /etc/fstab file to look like this:

#
# See fstab(5).
#
# <file system>	<dir>	<type>	<options>		<dump>	<pass>
UUID=XXXX-XXXX /boot vfat defaults 0 2
/dev/mapper/void-root / ext4 defaults 0 1
/dev/mapper/void-home /home ext4 defaults 0 2
/dev/mapper/void-swap none swap defaults 0 1
tmpfs		/tmp	tmpfs	defaults,nosuid,nodev   0       0

Replace XXXX-XXXX with your boot partition's UUID. If you didn't add a swap partition earlier, omit the "/dev/mapper/void-swap" line.

5. Update hostname:

# echo myhostname > /etc/hostname

6.Install GRUB:

# grub-mkconfig -o /boot/grub/grub.cfg
# grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id="Void Linux [GRUB]" --recheck
Warning: Add hostonly=yes in /etc/dracut.conf.d/hostonly.conf. Also, in /etc/default/grub you must add rd.auto=1 to the line GRUB_CMDLINE_LINUX_DEFAULT="...".

Configure glibc locale

Uncomment your preferred locales in /etc/default/libc-locales.

# xbps-reconfigure -f glibc-locales

Then, configure dracut and finally force update of dracut with:

# xbps-reconfigure -f linuxY.xx

Where Y.xx corresponds to your installed kernel version (e.g. linux4.19). You can check which version is installed with the command

# xbps-query -s "linux-"

Exit chroot, unmount the partitions and reboot

# exit
# umount -R /mnt
# reboot

If this fails to boot, see this note about UEFI.

Note that we used /boot and not /boot/efi, so you need to drop the ../efi/.. and then run:

# mkdir /boot/EFI/BOOT
# cp -p /boot/EFI/GRUB/grubx64.efi /boot/EFI/BOOT/bootx64.efi

Enjoy, and welcome to the Void!

You may now wish to view the Post Installation page.