Installing on GPT LVM
This is an updated version of this Howto: Setting up LVM on GPT-labeled disks.
This document describes how to set up a system booting from a logical volume in Alpine Linux using lvm2 and GPT-labeled disks.
Begin by booting from Alpine Linux installation media in the usual way. Log in as `root`, run `setup-alpine`, and answer `none` when asked to choose a disk.
Alpine Linux ISO used in this installation: alpine-vanilla-3.7.0-x86_64.iso
This PC has BIOS, not UEFI (UEFI installation may differ)
Tested on APU4C with 30GB Kingston mSata SSD (SMS200S3/30G).
We need to install some tools, as 'gptfdisk' and 'sgdisk' are part of main.
Create some partitions. In my case the SSD disk is found as sda, so I will use 'sda' throughout the process.
# create a new empty GUID partition table (GPT) with 'o' o # then 'y' to confirm # create some partitions: BIOS (needed only for GRUB2), Boot (needed by SYSLINUX), and LVM n 1 <enter> +2M ef02 n 2 <enter> +100M 8300 n 3 <enter> <enter> 8e00 # print the partition table with 'p'
You should get something like this:
Number Start (sector) End (sector) Size Code Name 1 2048 6143 2.0 MiB EF02 BIOS boot partition 2 6144 210943 100.0 MiB 8300 Linux filesystem 3 210944 15662270 7.4 GiB 8E00 Linux LVM
We need to set the 'legacy BIOS bootable' flag on our boot partition, which can be done in gdisk by first entering expert mode with 'x' then editing attributes with 'a'. It's used by SYSLINUX's GPT support to identify a partition that holds second-stage boot code.
x a 2 2
It looks like this:
Command (? for help): x
Expert command (? for help): a Partition number (1-3): 2 Known attributes are: 0: system partition 1: hide from EFI 2: legacy BIOS bootable 60: read-only 62: hidden 63: do not automount
Attribute value is 0000000000000000. Set fields are: No fields set
Toggle which attribute field (0-63, 64 or <Enter> to exit): 2 Have enabled the 'legacy BIOS bootable' attribute. Attribute value is 0000000000000004. Set fields are: 2 (legacy BIOS bootable)
Press 'Enter' to exit the expert mode and then write table to disk and exit gdisk with 'w'.
You can verify the legacy_boot flag with sgdisk (also part of the gptfdisk).
2:2:1 (legacy BIOS bootable)
Remove gptfdisk (if not needed anymore).
Now we can setup LVM on the third partition created in the process above.
Physical volume "/dev/sda3" successfully created
Volume group "vg00" successfully created
Logical volume "alpine_rootfs" created
Logical volume "swap" created
* service lvm added to runlevel default
2 logical volume(s) in volume group "vg00" now active
Format new logical volume and activate swap.
Mount for finishing Alpine Linux installation.
Run this command to finish installing Alpine Linux to our newly mounted partition on /mnt:
Output of setup-disk should be like this:
Installing system on /dev/vg00/alpine_rootfs: /mnt/boot is device /dev/sda2 /boot is device /dev/sda2 You might need fix the MBR to be able to boot
Install the MBR.
Reboot and enjoy your new Alpine Linux installation!