CloudStack Templates - Revision history

Merenber at 22:32, 16 February 2023

2023-02-16T22:32:20Z

← Older revision		Revision as of 17:32, 16 February 2023
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	We require that cloud templates be prepared with [https://cloud-init.io/ cloud-init]. cloud-init is a program which passes configuration data (e.g. user's SSH key) from a cloud provider to a VM at boot time. Most "major" GNU/Linux distributions have public cloud images which are (mostly) ready-to-use thanks to cloud-init.		We require that cloud templates be prepared with [https://cloud-init.io/ cloud-init]. cloud-init is a program which passes configuration data (e.g. user's SSH key) from a cloud provider to a VM at boot time. Most "major" GNU/Linux distributions have public cloud images which are (mostly) ready-to-use thanks to cloud-init.

			<strong>UPDATE</strong>: Creating templates is now automated with [https://git.csclub.uwaterloo.ca/cloud/cloudbuild cloudbuild]. The rest of this page is left for historical purposes only.

	== Overview ==		== Overview ==

Merenber: /* systemd-networkd */

2022-06-11T03:48:29Z

systemd-networkd

← Older revision		Revision as of 22:48, 10 June 2022
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	manage_etc_hosts: true		manage_etc_hosts: true
	</pre>		</pre>
	(These preserve our changes to /etc/apt/sources.list and /etc/hosts~~, respectively~~.)		These preserve our changes to /etc/apt/sources.list and tell cloud-init to manage /etc/hosts.

	=== systemd-timesyncd ===		=== systemd-timesyncd ===

Merenber: /* Downloading */

2022-06-10T03:02:06Z

Downloading

@@ Line 29: / Line 29: @@
 <pre>
 iptables -I OUTPUT 1 -j ACCEPT
 </pre>

R389li: Test

2022-05-28T02:15:41Z

Test

← Older revision		Revision as of 21:15, 27 May 2022
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	There are two ways to create a template:		There are two ways to create a template:

	1. Convert the root disk volume of an existing VM into a template		1. Convert the root disk volume of an existing VM into a template, or

	2. Take a QCOW2 file, mount it over NBD, and modify files as necessary		2. Take a QCOW2 file, mount it over NBD, and modify files as necessary

Merenber: /* Overview */

2022-05-27T22:42:30Z

Overview

← Older revision		Revision as of 17:42, 27 May 2022
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	1. Convert the root disk volume of an existing VM into a template		1. Convert the root disk volume of an existing VM into a template

	2. Take a QCOW2 file, mount it over NBD, and modify files as necessary		2. Take a QCOW2 file, mount it over NBD, and modify files as necessary

Merenber: /* NetworkManager */

2021-12-31T03:36:48Z

NetworkManager

← Older revision		Revision as of 22:36, 30 December 2021
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	dhcp = dhclient		dhcp = dhclient
	</pre>		</pre>

			Before you logout of the VM, make sure to also <code>rm -f /var/lib/NetworkManager/*</code> to get rid of stale dhclient lease files.

	=== chrony ===		=== chrony ===

Merenber: /* Fedora */

2021-12-31T03:35:39Z

Fedora

← Older revision		Revision as of 22:35, 30 December 2021
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	Unfortunately cloud-init completely failed when I tried to use the Fedora Cloud image (https://alt.fedoraproject.org/cloud/) on a CloudStack VM. So we're going to download the QEMU image and mount it over NBD (instructions: https://gist.github.com/shamil/62935d9b456a6f9877b5). Note that Fedora uses btrfs, so you'll need to run something like <code>mount -t btrfs /dev/nbd0p5 /mnt/fedora</code>.		Unfortunately cloud-init completely failed when I tried to use the Fedora Cloud image (https://alt.fedoraproject.org/cloud/) on a CloudStack VM. So we're going to download the QEMU image and mount it over NBD (instructions: https://gist.github.com/shamil/62935d9b456a6f9877b5). Note that Fedora uses btrfs, so you'll need to run something like <code>mount -t btrfs /dev/nbd0p5 /mnt/fedora</code>.

	Add <code>dhcp = dhclient</code> to the <code>[Main]</code> section of /etc/NetworkManager/NetworkManager.conf in the mounted filesystem. Unmount the filesystem, remove the NBD device, and move/copy the modified QEMU image to /var/www/csc-cloud-images. You should now be able to download the image from the CloudStack UI using the URL <~~code~~>http://biloba.cloud.csclub.uwaterloo.ca/csc-cloud-images/<name_of_file>.</~~code~~> Make sure to edit the iptables rules in the System Storage VM first (see ~~the '~~Limitations~~' section, above~~).		Add <code>dhcp = dhclient</code> to the <code>[Main]</code> section of /etc/NetworkManager/NetworkManager.conf in the mounted filesystem. Unmount the filesystem, remove the NBD device, and move/copy the modified QEMU image to /var/www/csc-cloud-images. You should now be able to download the image from the CloudStack UI using the URL <nowiki>http://biloba.cloud.csclub.uwaterloo.ca/csc-cloud-images/<name_of_file>.</nowiki> Make sure to edit the iptables rules in the System Storage VM first (see [[#Limitations]]).

			=== Mirrors ===
			For each file in /etc/yum.repos.d, comment out 'metalink' and set 'baseurl' to use the CSC mirror (except for cisco-openh264). For example, fedora.repo should use http://mirror.csclub.uwaterloo.ca/fedora/linux/releases/35/Everything/x86_64/os/.

Merenber at 03:28, 31 December 2021

2021-12-31T03:28:52Z

← Older revision		Revision as of 22:28, 30 December 2021
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	=== Cleanup ===		=== Cleanup ===
	Run <code>dnf clean all</code> instead of <code>apt clean</code>.		Run <code>dnf clean all</code> instead of <code>apt clean</code>.

			== Fedora ==
			All of the instructions for CentOS Stream apply, except for the changes below.

			=== Mount the QEMU image ===
			Unfortunately cloud-init completely failed when I tried to use the Fedora Cloud image (https://alt.fedoraproject.org/cloud/) on a CloudStack VM. So we're going to download the QEMU image and mount it over NBD (instructions: https://gist.github.com/shamil/62935d9b456a6f9877b5). Note that Fedora uses btrfs, so you'll need to run something like <code>mount -t btrfs /dev/nbd0p5 /mnt/fedora</code>.

			Add <code>dhcp = dhclient</code> to the <code>[Main]</code> section of /etc/NetworkManager/NetworkManager.conf in the mounted filesystem. Unmount the filesystem, remove the NBD device, and move/copy the modified QEMU image to /var/www/csc-cloud-images. You should now be able to download the image from the CloudStack UI using the URL <code>http://biloba.cloud.csclub.uwaterloo.ca/csc-cloud-images/<name_of_file>.</code> Make sure to edit the iptables rules in the System Storage VM first (see the 'Limitations' section, above).

Merenber: /* Mirrors */

2021-12-31T02:39:10Z

Mirrors

← Older revision		Revision as of 21:39, 30 December 2021
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	=== Mirrors ===		=== Mirrors ===
	In /etc/yum.repos.d, for each .repo file, comment out the 'mirrorlist=' line and e.g.		In /etc/yum.repos.d, for each .repo file, comment out the 'mirrorlist=' line and add e.g.
	<pre>		<pre>
	baseurl=http://mirror.csclub.uwaterloo.ca/$contentdir/$stream/BaseOS/$basearch/os/		baseurl=http://mirror.csclub.uwaterloo.ca/$contentdir/$stream/BaseOS/$basearch/os/

Merenber: /* cloud.cfg configuration */

2021-12-31T01:23:16Z

cloud.cfg configuration

← Older revision		Revision as of 20:23, 30 December 2021
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	=== cloud.cfg configuration ===		=== cloud.cfg configuration ===
	There is a bug in the cloud-init configuration which was fixed in RHEL 8.2 but ~~which~~ doesn't seem to have made it to CentOS Stream 8 (it may already be fixed in CentOS Stream 9). See [https://bugzilla.redhat.com/show_bug.cgi?id=1888761 here] and [https://bugzilla.redhat.com/show_bug.cgi?id=1963981 here].		There is a bug in the cloud-init configuration which was fixed in RHEL 8.2 but the fix doesn't seem to have made it to CentOS Stream 8 (it may already be fixed in CentOS Stream 9). See [https://bugzilla.redhat.com/show_bug.cgi?id=1888761 here] and [https://bugzilla.redhat.com/show_bug.cgi?id=1963981 here].

	In /etc/cloud/cloud.cfg, comment out the line 'ssh_genkeytypes: ~' and add this line:		In /etc/cloud/cloud.cfg, comment out the line 'ssh_genkeytypes: ~' and add this line: