Dualbooting: Difference between revisions

From Alpine Linux
m (Added warning that it does not work with the recent Alpine versions)
(general warning => problem hint)
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{{Warning|The information on this page is outdated and does not work with the recent versions of Alpine Linux}}


Assume you have a box where you run Ubuntu or your favourite distro. Now you would like to be able to boot either your already installed system or Alpine.
Assume you have a box where you run Ubuntu or your favourite distro. Now you would like to be able to boot either your already installed system or Alpine.
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Mount the newly formatted partition. After the mounting the partition will be available at {{Path|/mnt}}.
Mount the newly formatted partition. After the mounting the partition will be available at {{Path|/mnt}}.
{{Cmd|mount -t ext3 /dev/sda3 /mnt}}
{{Cmd|mount -t ext3 /dev/sda3 /mnt}}


== Basic setup ==
== Basic setup ==


Next, do some basic setup for your Alpine system.
This sets up alpine without installing to any disk, yet.
 
To do this, either run {{Cmd|setup-alpine}}, and when to prompted "Which disks do you like to use?" make sure to answer "none", and also answer "none" to the remaining prompts, about storing configs and the apk cache directory.


In Alpine 2.2.3 or newer, type:
Alternatively, run this command selection:
{{Cmd|setup-timezone
{{Cmd|setup-timezone
setup-alpine -q
setup-alpine -q
Line 35: Line 37:
setup-ntp}}
setup-ntp}}


See [[setup-alpine]] for more details. (If you omit the <code>-q</code> flag to <code>setup-alpine</code>, you'll be prompted "Which disks yous you like to use?" Answer "none", and also answer "none" to the remaining prompts, about storing configs and an apk cache directory.)
See [[setup-alpine]] for more details.
 


<!-- If the "answerfile" functionality of setup-alpine is changed to permit specifying "-m none" for setup-disk, this sequence could be expressed more concisely.-->
<!-- If the "answerfile" functionality of setup-alpine is changed to permit specifying "-m none" for setup-disk, this sequence could be expressed more concisely.-->


== Install Alpine ==
== Install Alpine ==


Now it's time to put our files on the partition.
Now it's time to copy the prepared system to the prepared partition(s) that where mounted below /mnt.
 
 
=== In Alpine 2.2.3 or newer ===


If using Alpine Linux 2.2.3 or higher, just type:
{{Cmd|setup-disk -m sys /mnt}}
{{Cmd|setup-disk -m sys /mnt}}


{{Tip|If you use extlinux and you didn't create a separate boot partition ({{Path|/boot}} is on the root partition {{Path|/}}), you might need to update the path to vmlinuz in {{Path|/boot/extlinux.conf}}, eg.:
{{Tip|If you use extlinux (default) and didn't create a separate boot partition, i.e. ({{Path|/boot}} resides on the root partition {{Path|/}}), you might need to adjust the paths to the boot files in {{Path|/boot/extlinux.conf}}, eg.:
<pre>[...]
<pre>[...]
LABEL hardened
LABEL hardened
   MENU DEFAULT
   MENU DEFAULT
   MENU LABEL Linux hardened
   MENU LABEL Linux hardened
   LINUX /boot/vmlinuz-hardened
   LINUX /boot/vmlinuz-lts
   INITRD /boot/initramfs-hardened
   INITRD /boot/initramfs-lts
[...]</pre>
[...]</pre>
Check that the <code>LINUX</code> and <code>INITRD</code> paths actually pint to the files shipped in your Alpine Linux release.
}}
}}


If using an earlier version of Alpine Linux, you'll need to install the files and [[Bootloaders|bootloader]] manually, as described below.


=== Installing files manually ===
=== With older Alpine versions up to 2.2.3 ===
 
If using an earlier version of Alpine Linux, you'll need to install the files and [[Bootloaders|bootloader]] manually.


{{Tip|If using a version of Alpine Linux older than 2.2.0, replace {{Path|/etc/apk/world}} in the last line with {{Path|/var/lib/apk/world}}}}
{{Tip|If using a version of Alpine Linux older than 2.2.0, replace {{Path|/etc/apk/world}} in the last line with {{Path|/var/lib/apk/world}}}}
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Your system is now on {{Path|/dev/sda3}}. Next thing is to be able to boot on it.
Your system is now on {{Path|/dev/sda3}}. Next thing is to be able to boot on it.


=== Installing bootloader manually ===
== Installing bootloader manually ==


On your system you already have a bootloader of some kind. The bootloaders vary, so you need to figure out how to make it boot your Alpine distro. Hopefully you get some ideas by looking at the following example below.
On your system you already have a bootloader of some kind. The bootloaders vary, so you need to figure out how to make it boot your Alpine distro. Hopefully you get some ideas by looking at the following example below.

Revision as of 09:06, 7 May 2021

Assume you have a box where you run Ubuntu or your favourite distro. Now you would like to be able to boot either your already installed system or Alpine.

Prepare your hardware

You will need a partition for your Alpine installation. If you don't already have one free, you need to create a primary partition with enough space for your Alpine installation. The tools you use for managing your partitions might differ, so you need to figure out your self how to use them. fdisk can help.

Make notes of what partition you will use for your Alpine installation. In this example we are going to install Alpine on /dev/sda3.

Installing Alpine on HDD

Now it's time to install Alpine. Boot your system with a CD containing the latest Alpine Standard from Downloads.

Format and mount HDD partition

First format your partition. We will need some tools for doing the formatting. After you are done those tools can be removed.

apk add e2fsprogs mkfs.ext3 /dev/sda3 apk del e2fsprogs

Warning: Make sure you format the right partition! The /dev/sda3 is only a example. If you choose the wrong partition your data will be gone. Make a backup first when you are unsure.


Mount the newly formatted partition. After the mounting the partition will be available at /mnt.

mount -t ext3 /dev/sda3 /mnt


Basic setup

This sets up alpine without installing to any disk, yet.

To do this, either run

setup-alpine

, and when to prompted "Which disks do you like to use?" make sure to answer "none", and also answer "none" to the remaining prompts, about storing configs and the apk cache directory.

Alternatively, run this command selection:

setup-timezone setup-alpine -q setup-sshd setup-ntp

See setup-alpine for more details.



Install Alpine

Now it's time to copy the prepared system to the prepared partition(s) that where mounted below /mnt.


In Alpine 2.2.3 or newer

setup-disk -m sys /mnt

Tip: If you use extlinux (default) and didn't create a separate boot partition, i.e. (/boot resides on the root partition /), you might need to adjust the paths to the boot files in /boot/extlinux.conf, eg.:
[...]
LABEL hardened
  MENU DEFAULT
  MENU LABEL Linux hardened
  LINUX /boot/vmlinuz-lts
  INITRD /boot/initramfs-lts
[...]

Check that the LINUX and INITRD paths actually pint to the files shipped in your Alpine Linux release.


With older Alpine versions up to 2.2.3

If using an earlier version of Alpine Linux, you'll need to install the files and bootloader manually.

Tip: If using a version of Alpine Linux older than 2.2.0, replace /etc/apk/world in the last line with /var/lib/apk/world

lbu package - | tar -C /mnt -xzf - apk add --root /mnt --initdb --repositories-file /etc/apk/repositories --keys-dir \ /etc/apk/keys $(cat /etc/apk/world) acct linux-hardened alpine-base

Your system is now on /dev/sda3. Next thing is to be able to boot on it.

Installing bootloader manually

On your system you already have a bootloader of some kind. The bootloaders vary, so you need to figure out how to make it boot your Alpine distro. Hopefully you get some ideas by looking at the following example below.

In my case I have Grub2 so I will describe what I did to boot Alpine.

Reboot your system (start Ubuntu).

Start a 'terminal' (ALT-F2 + "terminal" + [Run])

Take notes of the UUID of the partition you are planning to use:

sudo blkid /dev/sda3

Start editing grub2 configuration

gksudo gedit /etc/grub.d/40_custom

I edited the file so it looks something like this:

#!/bin/sh
echo "Adding Alpine" >&2
cat << EOF
menuentry "Alpine Linux" {
 set root=(hd0,3)
 linux /boot/vmlinuz-hardened root=UUID=8de6973a-4a8c-40ed-b710-c4e2b42d6b7a modules=sd-mod,usb-storage,ext3 quiet
 initrd /boot/initramfs-hardened
}
EOF
Note: The UUID-value mentioned above '8de6973a-4a8c-40ed-b710-c4e2b42d6b7a' should be replaced with the UUID you got when running your 'blkid' command.

We need to tell grub2 that the config has changed

update-grub2

Now it's time to test. Reboot your box.

Note: You might need to press SHIFT when booting up your box in order to see the grub-menu.