Xen Dom0 - Revision history

Zcrayfish: /* Installation */ update wikilink.

2024-01-12T09:04:44Z

Installation: update wikilink.

← Older revision		Revision as of 09:04, 12 January 2024
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	==== Installation ====		==== Installation ====
	Boot from your CD or USB device, and type 'root' when prompted for a username. After you have logged in, run <code>setup-xen-dom0</code>, then continue with a standard [[~~Install to disk\|Alpine~~ installation]] until you get to the prompt asking to choose your network card.		Boot from your CD or USB device, and type 'root' when prompted for a username. After you have logged in, run <code>setup-xen-dom0</code>, then continue with a standard Alpine [[installation]] until you get to the prompt asking to choose your network card.
	Select what will become your internet-facing interface, and when asked to bridge it type 'yes'. Then you can configure the networking settings of your bridge device, <code>br0</code>, as you would have configured your internet-facing interface.		Select what will become your internet-facing interface, and when asked to bridge it type 'yes'. Then you can configure the networking settings of your bridge device, <code>br0</code>, as you would have configured your internet-facing interface.
	{{Note\|You cannot bridge a WiFi interface in the automatic installation script due to incompatible protocols. Make sure you pick an ethernet interface for this.}}		{{Note\|You cannot bridge a WiFi interface in the automatic installation script due to incompatible protocols. Make sure you pick an ethernet interface for this.}}

Encode: Change link to Repositories page

2022-06-27T04:38:28Z

Change link to Repositories page

← Older revision		Revision as of 04:38, 27 June 2022
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	Now you can safely reboot after removing your install medium, making sure to pick the <code>Alpine Linux v3.12, with Xen 4.13.1 and Linux lts</code> boot option in your GRUB menu. Replace 3.12 and 4.13.1 with your Linux and Xen version numbers, respectively.		Now you can safely reboot after removing your install medium, making sure to pick the <code>Alpine Linux v3.12, with Xen 4.13.1 and Linux lts</code> boot option in your GRUB menu. Replace 3.12 and 4.13.1 with your Linux and Xen version numbers, respectively.

	After this, [[~~Enable Community Repository~~\|enable the Alpine community repository]] and install the firmware to be used for Xen's virtual machines:		After this, [[Repositories#Enabling_the_community_repository\|enable the Alpine community repository]] and install the firmware to be used for Xen's virtual machines:
	<pre>		<pre>
	apk add seabios ovmf		apk add seabios ovmf
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	=== Existing installation ===		=== Existing installation ===
	First you must [[~~Enable Community Repository~~\|enable the Alpine community repository]], then install Xen and the seabios (BIOS) and ovmf (UEFI) firmwares for its virtual machines.		First you must [[Repositories#Enabling_the_community_repository\|enable the Alpine community repository]], then install Xen and the seabios (BIOS) and ovmf (UEFI) firmwares for its virtual machines.

	<pre>		<pre>

Bt129 at 04:38, 2 August 2021

2021-08-02T04:38:07Z

← Older revision		Revision as of 04:38, 2 August 2021
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	This guide will show you how to ~~have~~ your 'sys' install of Alpine ~~run~~ as a Xen Dom0. You can start either ~~from~~ an existing standard install or install a new copy of Alpine with the Alpine Xen ISO.		This guide will show you how to set up your 'sys' install of Alpine as a Xen Dom0. You can start from either an existing standard install or install a new copy of Alpine with the Alpine Xen ISO.

	== Install Xen ==		== Install Xen ==
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	==== Writing the medium ====		==== Writing the medium ====
	{{Warning\|This will erase '''everything''' on the drive you point it at. Check and double check that <code>/dev/sdx</code> is the correct USB device you want to write to, using the commands <code>lsblk</code> and <code>blkid</code>.}}		{{Warning\|This will erase '''everything''' on the drive you point it at. Check and double check that <code>/dev/sdx</code> is the correct USB device you want to write to, using the commands <code>lsblk</code> and <code>blkid</code>.}}
	First download Alpine's [https://www.alpinelinux.org/downloads/ Xen install ISO], and either [[Burning ISOs\|burn the ISO to a CD/DVD]] or write it to a USB storage device with the following command, where <code>3.12.0</code> should be replaced with the release number of your downloaded ISO ~~and~~ <code>/dev/sdx</code> ~~should be replaced~~ with the drive letter of your USB:		First, download Alpine's [https://www.alpinelinux.org/downloads/ Xen install ISO], and either [[Burning ISOs\|burn the ISO to a CD/DVD]] or write it to a USB storage device with the following command, where <code>3.12.0</code> should be replaced with the release number of your downloaded ISO. Replace <code>/dev/sdx</code> with the drive letter of your USB device:
	<pre>dd if=alpine-xen-3.12.0-x86_64.iso of=/dev/sdx</pre>		<pre>dd if=alpine-xen-3.12.0-x86_64.iso of=/dev/sdx</pre>

	==== Installation ====		==== Installation ====
	~~Now boot~~ from your CD or USB, and type 'root' when prompted for a username. After you have logged in run <code>setup-xen-dom0</code>, then continue with a standard [[Install to disk\|Alpine installation]] until you get to the prompt asking to choose your network card.		Boot from your CD or USB device, and type 'root' when prompted for a username. After you have logged in, run <code>setup-xen-dom0</code>, then continue with a standard [[Install to disk\|Alpine installation]] until you get to the prompt asking to choose your network card.
	~~What you'll want to do is select~~ what ~~is to be~~ your internet-facing interface, and when asked to bridge it type 'yes'. Then you can configure the networking settings of your bridge device, <code>br0</code>, as you would have configured your internet-facing interface.		Select what will become your internet-facing interface, and when asked to bridge it type 'yes'. Then you can configure the networking settings of your bridge device, <code>br0</code>, as you would have configured your internet-facing interface.
	{{Note\|You cannot bridge a WiFi interface in the automatic installation script due to incompatible protocols. Make sure you pick an ethernet interface for this.}}		{{Note\|You cannot bridge a WiFi interface in the automatic installation script due to incompatible protocols. Make sure you pick an ethernet interface for this.}}
	~~Now continue~~ with your installation to disk until you reach the 'reboot' prompt. There are a few more things to do before you can boot without errors:		Continue with your installation to disk until you reach the 'reboot' prompt. There are a few more things to do before you can boot without errors:
	<pre>		<pre>
	# xen-hypervisor isn't installed by default with Xen so we must install it manually		# xen-hypervisor isn't installed by default with Xen so we must install it manually
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	</pre>		</pre>

	Now you can safely reboot after removing your install medium, making sure to pick the <code>Alpine Linux v3.12, with Xen 4.13.1 and Linux lts</code> boot option in your GRUB menu~~, with~~ 3.12 and 4.13.1 ~~replaced~~ with your Linux and Xen version numbers, respectively.		Now you can safely reboot after removing your install medium, making sure to pick the <code>Alpine Linux v3.12, with Xen 4.13.1 and Linux lts</code> boot option in your GRUB menu. Replace 3.12 and 4.13.1 with your Linux and Xen version numbers, respectively.

	After this, [[Enable Community Repository\|enable the Alpine community repository]] and install the firmware to be used for Xen's virtual machines:		After this, [[Enable Community Repository\|enable the Alpine community repository]] and install the firmware to be used for Xen's virtual machines:
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	This will install Xen Hypervisor, xl cli command and all the required packages. The next step is to modify your GRUB configuration to properly boot Xen.		This will install Xen Hypervisor, xl cli command and all the required packages. The next step is to modify your GRUB configuration to properly boot Xen.

	The next step is to load the necessary kernel modules for Xen~~, we~~ will add them to /etc/modules, so they will be loaded automatically on boot:		The next step is to load the necessary kernel modules for Xen. We will add them to /etc/modules, so they will be loaded automatically on boot:
	<pre>echo "xen-netback" >> /etc/modules		<pre>echo "xen-netback" >> /etc/modules
	echo "xen-blkback" >> /etc/modules		echo "xen-blkback" >> /etc/modules
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	rc-update add xenqemu		rc-update add xenqemu
	rc-update add xenstored</pre>		rc-update add xenstored</pre>
	~~Now reboot~~.		Reboot.

	== GRUB configuration ==		== GRUB configuration ==
	Once running a Xen kernel we will need to edit its command-line options and enable the setting of a default GRUB entry by inserting this at the bottom of <code>/etc/default/grub</code>:		Once running a Xen kernel, you will need to edit its command-line options and enable the setting of a default GRUB entry by inserting this at the bottom of <code>/etc/default/grub</code>:
	{{Cat\|/etc/default/grub\|<nowiki># We need to set the amount of RAM we allocate to ~~our~~ Dom0 Alpine install so that		{{Cat\|/etc/default/grub\|<nowiki># You need to set the amount of RAM to allocate to the Dom0 Alpine install so that
	# our future virtual machines ~~are left with~~ enough memory.		# our future virtual machines will have enough memory.
	GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M,max:1024M"		GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M,max:1024M"

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	GRUB_SAVEDEFAULT="true"</nowiki>}}		GRUB_SAVEDEFAULT="true"</nowiki>}}
	You can replace 1024M with the amount of memory you want to allocate to your Dom0 operating system.		You can replace 1024M with the amount of memory you want to allocate to your Dom0 operating system.
	After ~~this~~ you need to run the following:		After that, you need to run the following:
	<pre>grub-mkconfig -o /boot/grub/grub.cfg		<pre>grub-mkconfig -o /boot/grub/grub.cfg
	grub-set-default "$(grep ^menuentry /boot/grub/grub.cfg \| grep Xen \| cut -d \' -f 2 \| head -1)"		grub-set-default "$(grep ^menuentry /boot/grub/grub.cfg \| grep Xen \| cut -d \' -f 2 \| head -1)"
	</pre>		</pre>
	~~What this does is set your~~ default entry in GRUB to the first entry containing 'Xen'. Run this every time you upgrade Alpine or Xen.		That sets the default entry in GRUB to the first entry containing 'Xen'. Run this every time you upgrade Alpine or Xen.

	== Loop Devices ==		== Loop Devices ==
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	</pre>		</pre>

	~~Now~~ reflect the module options ~~in the initramfs~~:		Update initramfs to reflect the module options:

	<pre>		<pre>

Shelly at 08:18, 27 August 2020

2020-08-27T08:18:20Z

← Older revision		Revision as of 08:18, 27 August 2020
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	This will install Xen Hypervisor, xl cli command and all the required packages. The next step is to modify your GRUB configuration to properly boot Xen.		This will install Xen Hypervisor, xl cli command and all the required packages. The next step is to modify your GRUB configuration to properly boot Xen.

			The next step is to load the necessary kernel modules for Xen, we will add them to /etc/modules, so they will be loaded automatically on boot:
			<pre>echo "xen-netback" >> /etc/modules
			echo "xen-blkback" >> /etc/modules
			echo "tun" >> /etc/modules</pre>
			Then lastly we add the Xen daemons to the default runlevel.
			<pre>rc-update add xenconsoled
			rc-update add xendomains
			rc-update add xenqemu
			rc-update add xenstored</pre>
			Now reboot.

	== GRUB configuration ==		== GRUB configuration ==

Shelly at 08:09, 27 August 2020

2020-08-27T08:09:34Z

← Older revision		Revision as of 08:09, 27 August 2020
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	After this you need to run the following:		After this you need to run the following:
	<pre>grub-mkconfig -o /boot/grub/grub.cfg		<pre>grub-mkconfig -o /boot/grub/grub.cfg
	grub-set-default "$(grep ^menuentry \| grep Xen \| cut -d \' -f 2 \| head -1)"		grub-set-default "$(grep ^menuentry /boot/grub/grub.cfg \| grep Xen \| cut -d \' -f 2 \| head -1)"
	</pre>		</pre>
	What this does is set your default entry in GRUB to the first entry containing 'Xen'. Run this every time you upgrade Alpine or Xen.		What this does is set your default entry in GRUB to the first entry containing 'Xen'. Run this every time you upgrade Alpine or Xen.

Shelly at 06:18, 27 August 2020

2020-08-27T06:18:06Z

← Older revision		Revision as of 06:18, 27 August 2020
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	This guide will show you how to ~~perform a Xen Dom0 install on a HDD, so you can~~ have your ~~Dom0. The first step is to perform a normal HDD~~ install of Alpine ~~Linux, which~~ can ~~be accomplished following the guide [[Install to disk]]. Once the~~ install ~~is finished, and you have rebooted into your~~ new ~~system, it's time to install~~ the Xen ~~packages:~~		This guide will show you how to have your 'sys' install of Alpine run as a Xen Dom0. You can start either from an existing standard install or install a new copy of Alpine with the Alpine Xen ISO.

	<~~pre~~>		== Install Xen ==
	~~# apk add xen xen-hypervisor seabios~~		=== New installation ===
	</~~pre~~>		==== Writing the medium ====
			{{Warning\|This will erase '''everything''' on the drive you point it at. Check and double check that <code>/dev/sdx</code> is the correct USB device you want to write to, using the commands <code>lsblk</code> and <code>blkid</code>.}}
	~~Then~~ [https://~~wiki~~.alpinelinux.org/~~wiki~~/~~Enable_Community_Repository enable~~ the ~~community repositories~~] and ~~install ovmf from community~~.		First download Alpine's [https://www.alpinelinux.org/downloads/ Xen install ISO], and either [[Burning ISOs\|burn the ISO to a CD/DVD]] or write it to a USB storage device with the following command, where <code>3.12.0</code> should be replaced with the release number of your downloaded ISO and <code>/dev/sdx</code> should be replaced with the drive letter of your USB:
			<pre>dd if=alpine-xen-3.12.0-x86_64.iso of=/dev/sdx</pre>

			==== Installation ====
			Now boot from your CD or USB, and type 'root' when prompted for a username. After you have logged in run <code>setup-xen-dom0</code>, then continue with a standard [[Install to disk\|Alpine installation]] until you get to the prompt asking to choose your network card.
			What you'll want to do is select what is to be your internet-facing interface, and when asked to bridge it type 'yes'. Then you can configure the networking settings of your bridge device, <code>br0</code>, as you would have configured your internet-facing interface.
			{{Note\|You cannot bridge a WiFi interface in the automatic installation script due to incompatible protocols. Make sure you pick an ethernet interface for this.}}
			Now continue with your installation to disk until you reach the 'reboot' prompt. There are a few more things to do before you can boot without errors:
	<pre>		<pre>
	# apk add ~~ovmf~~		# xen-hypervisor isn't installed by default with Xen so we must install it manually
			apk add xen-hypervisor
			apk add bridge
	</pre>		</pre>

			Now you can safely reboot after removing your install medium, making sure to pick the <code>Alpine Linux v3.12, with Xen 4.13.1 and Linux lts</code> boot option in your GRUB menu, with 3.12 and 4.13.1 replaced with your Linux and Xen version numbers, respectively.

	~~'''seabios''' and '''ovmf''' provide BIOS and UEFI firmwares for Xen virtual machines. Please be advised that ovmf is part of the community repository. In order to download it~~, ~~you will need to add~~ the community repository ~~to [[Alpine_Linux_package_management#Packages_and_Repositories\|your configuration~~]].		After this, [[Enable Community Repository\|enable the Alpine community repository]] and install the firmware to be used for Xen's virtual machines:

	~~This will~~ install ~~Xen Hypervisor, xl cli command and all~~ the ~~required packages. The next step is~~ to ~~modify your extlinux.conf and add an entry to boot~~ Xen:

	~~Normal boot:~~

	~~<pre>~~
	~~LABEL xen~~
	~~KERNEL /boot/mboot.c32~~
	~~APPEND /boot/xen.gz --- /boot/grsec root=UUID=<YOUR-DISK-UUID> modules=ext4 --- /boot/grsec.gz~~
	~~</pre>~~

	~~Serial console boot~~:
	<pre>		<pre>
	~~LABEL xen~~		apk add seabios ovmf
	~~KERNEL /boot/mboot.c32~~
	~~APPEND /boot/xen.gz com1=115200,8n1 console=com1 --- /boot/grsec root=UUID=<YOUR-DISK-UUID> modules=ext4 --- /boot/grsec.gz~~
	</pre>		</pre>

	~~{{Note\|<nowiki>remember to change <YOUR-DISK-UUID> with the UUID of your boot disk (you can copy it from the normal Alpine Linux boot entry)</nowiki>}}~~		Now you are ready to configure GRUB.

	~~com1=115200,8n1 console=com1 redirect xen and dom0 to a physical serial port, handy if~~ you ~~want~~ to ~~use a serial null modem cable instead of a keyboard+monitor combo or if your server has an kvm over ip~~.

	~~It's also a good idea to check~~ [~~http://wiki.xen.org/wiki/Xen_Hypervisor_Boot_Options Xen Boot options~~] ~~and set dom0_mem~~, ~~dom0_vcpus_pin~~ and ~~dom0_max_vcpus at least.~~		=== Existing installation ===
			First you must [[Enable Community Repository\|enable the Alpine community repository]], then install Xen and the seabios (BIOS) and ovmf (UEFI) firmwares for its virtual machines.
	~~The next step is to load~~ the ~~necessary kernel modules~~ for ~~Xen, we will add them to /etc/modules, so they will be loaded automatically on boot:~~

	<pre>		<pre>
	# ~~echo "~~xen~~-netback" >> /etc/modules~~		# apk add xen xen-hypervisor seabios ovmf
	~~# echo "~~xen-~~blkback" >> /etc/modules~~
	~~# echo "tun" >> /etc/modules~~
	</pre>		</pre>

	The ~~last~~ step is to ~~configure startup services, we will need udev and xencommons at least~~ to ~~be started on~~ boot:		This will install Xen Hypervisor, xl cli command and all the required packages. The next step is to modify your GRUB configuration to properly boot Xen.

	<~~pre~~>		== GRUB configuration ==
	~~rc-update add xenconsoled~~		Once running a Xen kernel we will need to edit its command-line options and enable the setting of a default GRUB entry by inserting this at the bottom of <code>/etc/default/grub</code>:
	~~rc-update add xendomains~~		{{Cat\|/etc/default/grub\|<nowiki># We need to set the amount of RAM we allocate to our Dom0 Alpine install so that
	~~rc-update add xenqemu~~		# our future virtual machines are left with enough memory.
	~~rc-update add xenstored~~		GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M,max:1024M"
	~~</pre>~~

	~~Ok, now~~ you ~~have a fully functional Xen install, it's time~~ to ~~boot into it~~.		GRUB_DEFAULT="saved"
			GRUB_SAVEDEFAULT="true"</nowiki>}}
	<pre>		You can replace 1024M with the amount of memory you want to allocate to your Dom0 operating system.
	~~# reboot~~		After this you need to run the following:
			<pre>grub-mkconfig -o /boot/grub/grub.cfg
			grub-set-default "$(grep ^menuentry \| grep Xen \| cut -d \' -f 2 \| head -1)"
	</pre>		</pre>
			What this does is set your default entry in GRUB to the first entry containing 'Xen'. Run this every time you upgrade Alpine or Xen.
	~~Also remember~~ to ~~configure at least one network bridge following~~ the ~~[[Bridge]] guide~~.

	== Loop Devices ==		== Loop Devices ==
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	== See also ==		== See also ==
	* [[Xen Dom0 on USB or SD]]		* [[Xen Dom0 on USB or SD]]
			* [https://wiki.gentoo.org/wiki/Xen#Host_configuration_.28domain-0.29\|Xen page on Gentoo wiki]
	[[Category:Virtualization]]		[[Category:Virtualization]]

Jmturner: actually hyphens, not underscores

2019-11-27T22:03:43Z

actually hyphens, not underscores

← Older revision		Revision as of 22:03, 27 November 2019
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	<pre>		<pre>
	# echo "~~xen_netback~~" >> /etc/modules		# echo "xen-netback" >> /etc/modules
	# echo "~~xen_blkback~~" >> /etc/modules		# echo "xen-blkback" >> /etc/modules
	# echo "tun" >> /etc/modules		# echo "tun" >> /etc/modules
	</pre>		</pre>

Jmturner: extlinux.cfg does not exist. Fixed to extlinux.conf

2019-11-27T21:53:09Z

extlinux.cfg does not exist. Fixed to extlinux.conf

← Older revision		Revision as of 21:53, 27 November 2019
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	'''seabios''' and '''ovmf''' provide BIOS and UEFI firmwares for Xen virtual machines. Please be advised that ovmf is part of the community repository. In order to download it, you will need to add the community repository to [[Alpine_Linux_package_management#Packages_and_Repositories\|your configuration]].		'''seabios''' and '''ovmf''' provide BIOS and UEFI firmwares for Xen virtual machines. Please be advised that ovmf is part of the community repository. In order to download it, you will need to add the community repository to [[Alpine_Linux_package_management#Packages_and_Repositories\|your configuration]].

	This will install Xen Hypervisor, xl cli command and all the required packages. The next step is to modify your extlinux.~~cfg~~ and add an entry to boot Xen:		This will install Xen Hypervisor, xl cli command and all the required packages. The next step is to modify your extlinux.conf and add an entry to boot Xen:

	Normal boot:		Normal boot:

MyNameIsCosmo: Add section about increasing loop-devices

2019-08-06T14:32:11Z

Add section about increasing loop-devices

← Older revision		Revision as of 14:32, 6 August 2019
Line 61:		Line 61:

	Also remember to configure at least one network bridge following the [[Bridge]] guide.		Also remember to configure at least one network bridge following the [[Bridge]] guide.

			== Loop Devices ==
			If you plan to use more than 8 DomU's, you may need to increase the amount of loop-devices in your Dom0.

			In Alpine Linux, you will need to add the ''max_loop'' option to the ''loop'' module, then add the loop module to your initramfs.

			Start by populating <code>/etc/modprobe.d/loop.conf</code> with the module options:

			<pre>
			# touch /etc/modprobe.d/loop.conf
			# echo "options loop max_loop=32" > /etc/modprobe.d/loop.conf
			</pre>

			Now reflect the module options in the initramfs:

			<pre>
			# mkinitfs
			# reboot
			</pre>

	== See also ==		== See also ==

Leo at 03:27, 22 May 2019

2019-05-22T03:27:05Z

← Older revision		Revision as of 03:27, 22 May 2019
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	<pre>		<pre>
	# apk add xen xen-hypervisor seabios ~~ovmf~~		# apk add xen xen-hypervisor seabios
	</pre>		</pre>

			Then [https://wiki.alpinelinux.org/wiki/Enable_Community_Repository enable the community repositories] and install ovmf from community.

			<pre>
			# apk add ovmf
			</pre>


	'''seabios''' and '''ovmf''' provide BIOS and UEFI firmwares for Xen virtual machines. Please be advised that ovmf is part of the community repository. In order to download it, you will need to add the community repository to [[Alpine_Linux_package_management#Packages_and_Repositories\|your configuration]].		'''seabios''' and '''ovmf''' provide BIOS and UEFI firmwares for Xen virtual machines. Please be advised that ovmf is part of the community repository. In order to download it, you will need to add the community repository to [[Alpine_Linux_package_management#Packages_and_Repositories\|your configuration]].