Alpine Install: from a disc to PC Engines APU

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Overall description: Alpine Installation from an official image tar file downloaded to a real second generation PC Engines APU systems (apu2, apu3, apu4), where it will be single OS only.

This document will guide you to install Alpine into second generation PC Engines APU systems, it was tested with an apu2d4 and Alpine 3.11.6.. For others ways to install see at the Alpine_newbie_install_manual


  • BIOS: it's a system into computer hardware machine laptop or desktops, embedded that will manage the early boot process, see more in the Alpine and UEFI page.
  • New machine: will be your real machine fresh and ready to install your new Alpine operating system, with an installed ISO image where to put the downloaded media installation.
  • Bootable USB: will be your hardware drive input to put the image downloaded iso media with the operating system Alpine to install as source media; this drive are commonly named USB unit.
  • Serial console: is an input port on the device.. DB9 serial port for serial console, located at the board to use as char device, it's common in those devices.
  • Source media: will be the just burned / disc from the downloaded iso file of Alpine operating system. Will be Attach to the serial console to property boot the source disc as media installation.
  • Target media: will be the storage medium device into the new computer target where the Alpine files for operating system will be installed, its one partition from the HardDisk of the new computer.

Booting the Alpine ISO disc

  1. It's probably a good idea to ensure that the BIOS / Firmware is up to date.
  2. Create_a_Bootable_USB thumb drive with the current standard x86_64 image from the downloads page.
  3. Attach to the serial console. Configure your terminal emulator for 115200 8n1.
  4. Power on the APU.
  5. When BIOS prompted, hit F10 and select to boot from USB.
  6. At the boot prompt, quickly type a slash to interrupt the default boot, which has a short timeout.
  7. Continue entering the remainder of this command at your leisure. It should have only one slash at the start, to be clear: /boot/vmlinuz-lts modules=loop,squashfs,sd-mod,usb-storage nomodeset console=ttyS0,115200 initrd=/boot/initramfs-lts
  8. Alpine should come up as normal.

Hdd mount.png

This page explains the basics to get started. But before actually installing, it can also help to skim through the Frequenty Asked Questions (FAQ).

Tip: This is a wiki!

If something isn't correct (anymore), or still incomplete, you will have to try figuring it out, or ask for the correct solution in the community.

And then carefully edit the wiki page.

Just as those before you did it for you.

Minimal Hardware Requirements

  • At least 100 MB of RAM. [A graphical desktop system may require up to 1 GB minimum.]
  • At least 0-700 MB space on a writable storage device. [Only required in "sys" or "data" mode installations (explained below). It is optional in "diskless" mode, where it may be used to save newer data and configurations states of a running system.]

For more information please check Requirements

Installation Overview

The general course of action

Note: For single-board-computer (SBC) architectures which can not boot .iso images, see Alpine on ARM for peculiarities.

As usual, the regular installation procedure starts with three basic steps (additional details for all the steps follow below):

  1. Downloading and verifying the proper stable-release ISO installation image-file for the computer's architecture, and the corresponding sha256 (checksum) and GPG (signature) files.
  2. Either burning the ISO image-file onto a blank CD/DVD/Blu-ray disk with disk burning software, or flashing the installation image onto a bootable storage device (USB-device, CF-/MMC-/SD-card, floppy, ...). Optionally to setup a headless system, a bootstrapping configuration overlay file headless.apkovl.tar.gz may be added to enable basic networking, so that following configuration steps can be performed under ssh.
  3. Booting the computer from the prepared disk or storage device.

The boot process of the installation image first copies the entire operating system into the RAM memory, and then already starts a complete Alpine Linux system from there. It will initially only provide a basic command line environment that does not depend on reading from any (possibly slow) initial boot media, anymore.

Log-in is possible as the user root. Initially, the root user has no password.

At the command prompt, an interactive script named setup-alpine is available to configure and install the initial Alpine Linux system.

The question-and-answer dialog of setup-alpine takes care of the base configuration and allows to configure the system to
boot into one of three different Alpine Linux disk modes: "diskless", "data", or "sys".

These modes are explained in more detail in the following subsections.

Note: It can be helpful to know that it is possible to first only complete a base configuration of the initial "diskless" installation system in order to to prepare the system. For example, to download and install some specific driver or software tool. And then use more specific setup-scripts afterwards, to proceed with the final installation. The base configuration of the "diskless" system may be completed by running setup-alpine and answering "none" when asked for the disk to use, and where to store configs, as well as for the location for the package cache.

Examples of preparation options:

  • Preparing a custom partitioning or filesystem scheme that avoids to use and/or overwrite an entire disk (details below).
  • Installing something that may be missing in the live system to configure the hardware, e.g. by using the alpine package manager apk.

Examples of proceeding options:

  • setup-lbu to configure a "local backup" location for the diskless system, and lbu commit to then save the local configuration state.
  • setup-apkcache to configure a local package cache storage location.
  • setup-disk to add a "data" mode partition, or do a classic full install of the "diskless" system onto a "sys" disk or partition.

There are many more setup-scripts available. All these tools may also be run later to adjust specific configurations. For example, to set up a graphical environment as covered under Post-Installation below.

Diskless Mode

This means the entire operating system with all applications are first loaded into RAM and then only run from there. This is the method already used to boot the .iso installation images, however setup-alpine can also configure the installed system to continue to boot like this if "disk=none" is specified. The mode is extremely fast and can save on unnecessary disk spin-ups, power, and wear. It is similar to what other linux distributions may call a "frugal" install or boot into with a "toram" option.

Custom configurations and package installations may optionally still be preserved or "persist" across reboots by using the Alpine local backup tool lbu. It enables committing and reverting system states by using .apkovl files that are saved to writable storage and loaded when booting. If additional or updated packages have been added to the system, these may also be made available for automatic (re)installation during the boot phase without any (re)downloading, by enabling a local package cache on the writable storage.

[FIXME-1: Storing local configs and the package cache on an internal disk still requires some manual steps to have the partition listed, i.e. making a /etc/fstab entry, mountpoint, and mount, *before* running setup-alpine. The linked workaround also still requires to commit these configurations to disk manually before rebooting.]

If a writable partition is available, setup-alpine can be told to store the configs and the package cache on that writable partition. (Later, another directory on that same partition or another available partition may also be mounted as /home, or for example, for selected important applications to keep their run-time and user data on it.)

The boot device of the newly configured local "diskless" system may remain the initial (and possibly read-only) installation media. But it is also possible to copy the boot system to a partition (e.g. /dev/sdXY) with setup-bootable.

Data Disk Mode

This mode also runs from system RAM, thus it enjoys the same accelerated operation speed as "diskless" mode. However, swap storage and the entire /var directory tree get mounted from a persistent storage device (two newly created partitions). The directory /var holds e.g. all log files, mailspools, databases, etc., as well as lbu backup commits and the package cache. This mode is useful for having RAM accelerated servers with variable amounts of user-data that exceed the available RAM size. It enables the entire current system state (not just the boot state) to survive a system crash in accordance with the particular filesystem guarantees.

[FIXME-2]: Setup-alpine will create the data partition and mount it as /var, but can not yet configure lbu storage settings automatically. It is currently necessary to select "none" at the 'where to store configs' prompt (the new data partition is not listed) and configure lbu manually, i.e. after running setup-alpine and before rebooting:

  1. Identify the created data partition, e.g. /dev/sdXY, and its filesystemtype, e.g. using lsblk
  2. Manually edit the lbu backups location in /etc/lbu/lbu.conf and configure LBU_MEDIA=sdXY (according to previous findings).
  3. Save the configuration on that partition for the next boot with lbu commit.
  4. If (a new) partition fails to get mounted, execute: mkdir /media/sdXY ; echo "/dev/sdXY /media/sdXY fstype noauto,rw 0 0" >> /etc/fstab, and try lbu commit again.

In data disk mode, the boot device may also remain the initial (and possibly read-only) installation media, or be copied to a partition (e.g. /dev/sdXY) with setup-bootable.

System Disk Mode

This is a traditional hard-disk install.

If this mode is selected, the setup-alpine script creates three partitions on the selected storage device, /boot, swap and / (the filesystem root). This mode may, for example, be used for generic desktop and development machines.

For custom partitioning, see Setting up disks manually.

To install along side another operating systems, see Dualbooting.

Basic Installation Step Details

This material needs expanding ...

This "Additional Details" section needs to be consolidated with the work at (not finished) (Restructuring things there, moving and linking from here or there?).

Verifying the downloaded image-file

Commands to verify the checksum and GPG signature of a downloaded image-file on different systems.
OS type SHA256 check SHA256 calculation (to be compared manually) GPG signature verification
Linux sha256sum -c alpine-*.iso.sha256 curl | gpg --import ;

gpg --verify alpine-<version>.iso.asc alpine-<version>.iso

MACOS - ? - shasum -a 256 alpine-*.iso - ? -
OpenBSD sha256 -C alpine-*.sha256 alpine-*.iso doas pkg_add gnupg;

ftp -o - | gpg --import ; gpg --verify alpine-<version>.iso.asc alpine-<version>.iso

FreeBSD - ? - /usr/local/bin/shasum -a 256 alpine-*.iso - ? -
NetBSD - ? - /usr/local/bin/shasum -a 256 alpine-*.iso - ? -
Windows (PowerShell installed) - ? - Get-FileHash .\alpine-<image-version>.iso -Algorithm SHA256 - ? -

Flashing (direct data writing) the installation image-file onto a device or media


Under Unix (and thus Linux), "everything is a file" and the data in the image-file can be written to a device or media with the dd command. Afterward, executing the eject command removes the target device from the system and ensures the write cache is completely flushed.

dd if=<iso-file-to-read-in> of=<target-device-node-to-write-out-to> bs=4M oflag=sync status=progress; eject <target-device-node-to-write-to>

Be careful to correctly identify the target device as any data on it will be lost! All connected "bulk storage devices" can be listed with lsblk and blkid.

# lsblk
sdX               0:0    0  64,0G  0 disk  
├─sdX1            0:1    0     2G  0 part  
└─sdX2            0:2    0    30G  0 part  /mnt/sdX2

# blkid
/dev/sdX1: LABEL="some" UUID="..." TYPE="vfat"
/dev/sdX2: LABEL="other" UUID="..." TYPE="ext4"

For example, if /dev/sdX is the desired target device, first make sure you un-mount all mounted partitions of the target device. For example sdX1 and sdX2:

umount  /dev/sdX1  /dev/sdX2

For dd's output-file (of=), however, do not specify a partition number. For example, write to sdX, not sdX1:

Warning: This will overwrite the target device /dev/sdX, so before executing, make sure you have a backup of the data if you can't afford to lose it.

dd if=~/Downloads/alpine-standard-3.00.0-x86_64.iso of=/dev/sdX bs=4M oflag=sync status=progress; eject /dev/sdX


For example, there is the Rufus program. Rufus will enable you to create bootable USB flash drives under Windows.

Rufus has been tested and works for Alpine Linux 3.12.x with the following settings:

  • Partition scheme: MBR
  • Target system: BIOS or UEFI
  • File system: FAT32
  • Cluster size: 4096 bytes (default)

Verifying the written installation media

After detaching and re-attaching the device, a bit-wise comparison can verify the data written to the device (instead of just data buffered in RAM). If the comparison terminates with an end-of-file error on the .iso file side, all the contents from the image have been written (and re-read) successfully:

# cmp ~/Downloads/alpine-standard-3.00.0-x86_64.iso /dev/sdX
cmp: EOF on alpine-standard-3.00.0-x86_64.iso

Booting from external devices

Insert the boot media to a proper drive or port of the computer and turn the machine on, or restart it, if already running.

If the computer does not automatically boot from the desired device, one needs to bring up the boot menu and choose the media to boot from. Depending on the computer, the menu may be accessed by repeatedly pressing a key quickly when booting starts. Some computers require that you press the button before starting the computer and hold it down while the computer boots. Typical keys are: `F9`-`F12`, sometimes `F7` or `F8`. If these don't bring up the boot menu, it may be necessary to enter the BIOS configuration and adjust the boot settings, for which typical keys are: `Del.` `F1` `F2` `F6` or `Esc.`

Custom partitioning of the harddisk

It is possible to specify configurations for RAID, encryption, LVM, etc. as well as manual partitioning.

For "diskless" or "data disk" mode installs, manual partitioning may be needed to prepare the harddisk for committing local backups of the system state with lbu commit, to have a place for a package cache, or to use it for a /var mount.

For a "sys" install, custom partitioning is needed only if the desired scheme differs from overwriting an entire disk, or using the default set of a /boot, swap and root partition on the disk.

See Setting up disks manually for the alpine options for RAID, encryption, LVM, etc. and manual partitioning.

Questions asked by setup-alpine

Example setup-alpine session

The setup-alpine script offers the following configuration options:

  • Keyboard Layout (Local keyboard language and usage mode, e.g. us and variant of us-nodeadkeys.)
  • Hostname (The name for the computer.)
  • Network (For example, automatic IP address discovery with the "DHCP" protocol.)
  • DNS Servers (Domain Name Servers to query. For privacy reasons it is NOT recommended to route every local request to servers like google's .)
  • Timezone
  • Proxy (Proxy server to use for accessing the web. Use "none" for direct connections to the internet.)
  • Mirror (From where to download packages. Choose the organization you trust giving your usage patterns to.)
  • SSH (Secure SHell remote access server. "Openssh" is part of the default install image. Use "none" to disable remote login, e.g. on laptops.)
  • NTP (Network Time Protocol client used for keeping the system clock in sync with a time server. Package "chrony" is part of the default install image.)
  • Disk Mode (Select between diskless (disk="none"), "data" or "sys", as described above.)
Warning: The data on a chosen device will be overwritten!

Preparing for the first boot

If setup-alpine has finished configuring the "sys" disk mode, the system should be ready to reboot right away (see next subsection).

If the new local system was configured to run in "diskless" or "data" mode, and you do not want keep booting from the initial (and possibly read-only) installation media, the boot system needs to be copied to another device or partition.

The target partition may be identified using lsblk (after installing it with apk add lsblk) and/or blkid, similar to previously identifying the initial installation media device.

The procedure to copy the boot system is explained at setup-bootable

Once everything is in place, save your customized configuration with lbu commit before rebooting.

Rebooting and testing the new system

First, remove the initial installation media from the boot drive, or detach it from the port it's connected to.

The system may now be power-cycled or rebooted to confirm everything is working correctly.

The relevant commands for this are poweroff or reboot.

Completing the installation

The installation script installs only the base operating system. No applications e.g. web server, mail server, desktop environment, or web browser are installed, and root is the only user.

Please look under Post-Installation below, for some common things to do after installation.

Further Installation Instructions

Note: Specific topics should be kept on separate, individually manageable topic-pages and only get listed with a direct reference (link) on this general page.


Also see other Installation Category pages.


Broader Usage Guides

General Documentation

Tip: Alpine Linux packages stay close to the upstream design. Therefore, all upstream documentation about configuring a software package, as well as good configuration guides from other distributions that stay close to upstream, e.g. those in the ArchWiki, are to a large degree, also applicable to configuring the software on Alpine Linux, thus can be very useful.

Which disk choose to use?

To choose the disk destination ..

How would be used?

Then choose type of installation .. those are described at Setup modes section at Alpine setup scripts wiki page. "sys" mode is the familiar install to disk well known for usage as main OS to computers.

After all a confirmation question will raised, type "y" if everything are ok and the setup will proceed to erase, format and copy the files to the destination disk choose!

After reboot

  1. Before rebooting, edit /boot/extlinux.conf.
    1. Add SERIAL 0 115200 as the first line in the file.
    2. In the APPEND line, replace quiet with console=ttyS0,115200
  2. Remove the thumb drive.
  3. Cross your fingers and reboot. The system should boot properly with console on serial.
  4. Edit /etc/update-extlinux.conf so that if extlinux.conf is regenerated it will retain these settings:
    1. Update the line with serial_port to read serial_port=0
    2. Update the serial_baud line to read serial_baud=115200
    3. Update the default_kernel_opts line to replace quiet with console=ttyS0,115200
  5. Run update-extlinux
  6. Examine /boot/extlinux.conf.
    1. Make sure it looks OK. Compare with /boot/extlinux.conf-old.
    2. If something looks wrong, mv /boot/extlinux.conf-old /boot/extlinux.conf to roll back the changes and try to figure out what went wrong
  7. Cross your fingers and reboot. The system should boot properly with console on serial.

Documents series

Previous required What's next to read
Alpine newbie install manual Alpine newbie apk packages

See Also

  1. Newbie_Alpine_Ecosystem
  2. Alpine and UEFI
  3. Alpine newbie apk packages
  4. Alpine newbie desktops
  5. Alpine newbie developer
  6. Alpine newbie lammers

es:Alpine Instalar: de un disco a una nueva computadora arrancar un solo sistema