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Create virtual machines quickly with virt-builder

Project description

virt-up

virt-up is a command line tool for creating virtual machines quickly on a local KVM hypervisor using virt-builder, virt-sysprep, and virt-install.

Virtual machines are created from existing digitally signed OS images, which are downloaded and cached. A template virtual machine is created from the downloaded image. Optionally, an ansible playbook is executed to further customize the templates. Virtual machines are cloned from the templates to quickly create new instances.

A login user and the ssh keys to connect to the new virtual machines are created automatically. The login user is given sudo access. Connection information is stored in a json meta data file for each virtual machine created. An ansible inventory file is created for the templates and instances to make it easier to run ansible playbooks for further configuration.

Normally you should run virt-up as a regular user, not root.

By default, virt-up will create image files in the default libvirt storage pool (/var/lib/libvirt/images). See the pool option Settings to change this. Be sure you have read and write access to the configured libvirt storage pool.

System requirements

  • Python 3.6 or better
  • Local KVM hypervisor
  • Python libvirt package
  • qemu-img, virt-builder, virt-sysprep, virt-install

Usage

usage: virt-up [--name] <name> [--template <template>] [options]
               --list [--all] | --list-templates
               --login [--name] <name> [--command "<command>"]
               --delete [--name] <name> | --delete --all

positional arguments:
  <name>                instance name

optional arguments:
  -h, --help            show this help message and exit
  --version             show program's version number and exit
  --list                list instances
  --list-templates      list template names
  --delete              delete the instance
  -t <template>, --template <template>
                        template definition name (default: <name>)
  --root-password <root-password>
                        root password (default: random)
  --user <user>         username (default: virt)
  --password <password>
                        password (default: random)
  --size <size>         instance disk size (default: image size)
  --memory <memory>     instance memory (default: 512)
  --vcpus <vcpus>       instance vcpus (default: 1)
  --graphics <graphics>
                        instance graphics type (default: none)
  --command <command>   --login ssh command
  --no-clone            build template instance only, --name is ignored
  --all                 include template instances
  --yes                 answer yes to interactive questions
  --quiet               show less output
  --debug               show debug tracing

Ubuntu installation notes

Linux images are not readable by regular users on recent Ubuntu distributions, which breaks the ability of libguestfs to modify guest images. Update the permissions with the dpkg-statoverride command to be able to run the libguestfs tools as a regular user:

$ for image in /boot/vmlinu*; do sudo dpkg-statoverride –update –add root root 0644 $image || true; done

You will need to run this everytime the kernel is updated.

Settings

virt-up reads settings for INI formatted configuration files. The following files are read in order, when present.

  • /etc/virt-up/settings.cfg
  • $XDG_CONFIG_HOME/virt-up/settings.cfg ($XDG_CONFIG_HOME is $HOME/.config if not set)

The settings.cfg should contain one section called [site]. The following fields are supported:

pool
The libvirt storage pool to write images. (default: default)
username
The username of the user account created by virt-up when creating new template instances (default: virt)
dns-domain
The DNS domain used for new template instance hostnames. (default: None)
address-source
The method used to detect the instance IP address. Supported values are agent, lease, arp, dns. (default: agent)
image-format
The image format. Supported values are qcow2, and raw. (default: qcow2)
virt-builder-args
Extra arguments for virt-builder. (default: None)
virt-sysprep-args
Extra arguments for virt-sysprep. (default: None)
virt-install-args
Extra arguments for virt-install. (default: None)
template-playbook
Optional ansible playbook to be executed on newly created template instances. (default: None)
instance-playbook
Optional ansible playbook to be executed on newly created instances. (default: None)

Template definitions

Additional template-definitions can be created with virt-up by providing template defintions in the following files:

  • /etc/virt-up/templates.cfg
  • $XDG_CONFIG_HOME/virt-up/templates.cfg ($XDG_CONFIG_HOME is $HOME/.config if not set)

The templates.cfg files are INI formatted text files. Provide one section for each template definition. The section name is the template definition name used in virt-up --template option. The following fields are supported:

desc
A text description, show by --list-templates.
os-version
The virt-builder <os_version> name. See virt-builder --list for available names.
os-type
The virt-install --os-type
os-variant
The virt-install --os-variant. See osquery-info os for available names.
arch
The target architecture.
virt-builder-args
Template specific extra arguments for virt-builder. (default: None)
virt-sysprep-args
Template specific extra arguments for virt-sysprep. (default: None)
virt-install-args =
Template specific extra arguments for virt-install. (default: None)
template-playbook
Optional ansible playbook to be executed on newly created template instances. (default: None)
instance-playbook
Optional ansible playbook to be executed on newly created instances. (default: None)

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