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123 lines
3.6 KiB
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123 lines
3.6 KiB
ReStructuredText
============================
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Getting Started With Libvirt
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============================
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Libvirt is a toolkit to interact with the virtualization capabilities of recent versions
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of Linux (and other OSes). This driver Salt cloud provider is currently geared towards
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libvirt with qemu-kvm.
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http://www.libvirt.org/
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Dependencies
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============
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* libvirt >= 1.2.18 (older might work)
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Provider Configuration
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======================
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For every KVM host a provider needs to be set up. The provider currently maps to one libvirt daemon (e.g. one KVM host).
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Set up the provider cloud configuration file at ``/etc/salt/cloud.providers`` or
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``/etc/salt/cloud.providers.d/*.conf``.
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.. code-block:: yaml
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# Set up a provider with qemu+ssh protocol
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kvm-via-ssh:
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driver: libvirt
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url: qemu+ssh://user@kvm.company.com/system?socket=/var/run/libvirt/libvirt-sock
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# Or connect to a local libvirt instance
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local-kvm:
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driver: libvirt
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url: qemu:///system
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Cloud Profiles
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==============
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Virtual machines get cloned from so called Cloud Profiles. Profiles can be set up at ``/etc/salt/cloud.profiles`` or
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``/etc/salt/cloud.profiles.d/*.conf``:
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* Configure a profile to be used:
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.. code-block:: yaml
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centos7:
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# points back at provider configuration
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provider: local-kvm
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base_domain: base-centos7-64
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ip_source: ip-learning
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ssh_username: root
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password: my-very-secret-password
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# /tmp is mounted noexec.. do workaround
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deploy_command: sh /tmp/.saltcloud/deploy.sh
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script_args: -F
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# grains to add to the minion
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grains:
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clones-are-awesome: true
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# override minion settings
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minion:
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master: 192.168.16.1
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master_port: 5506
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The profile can be realized now with a salt command:
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.. code-block:: bash
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# salt-cloud -p centos7 my-centos7-clone
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This will create an instance named ``my-centos7-clone`` on the cloud host. Also
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the minion id will be set to ``my-centos7-clone``.
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If the command was executed on the salt-master, its Salt key will automatically
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be signed on the master.
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Once the instance has been created with salt-minion installed, connectivity to
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it can be verified with Salt:
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.. code-block:: bash
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# salt my-centos7-clone test.ping
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Required Settings
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=================
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The following settings are always required for libvirt:
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.. code-block:: yaml
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centos7:
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provider: local-kvm
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# the domain to clone
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base_domain: base-centos7-64
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# how to obtain the IP address of the cloned instance
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# ip-learning or qemu-agent
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ip_source: ip-learning
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The ``ip_source`` setting controls how the IP address of the cloned instance is determined.
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When using ``ip-learning`` the IP is requested from libvirt. This needs a recent libvirt
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version and may only work for NAT networks. Another option is to use ``qemu-agent`` this requires
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that the qemu-agent is installed and configured to run at startup in the base domain.
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Optional Settings
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=================
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.. code-block:: yaml
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# Username and password
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ssh_username: root
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password: my-secret-password
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# Cloning strategy: full or quick
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clone_strategy: quick
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The ``clone_strategy`` controls how the clone is done. In case of ``full`` the disks
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are copied creating a standalone clone. If ``quick`` is used the disks of the base domain
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are used as backing disks for the clone. This results in nearly instantaneous clones at
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the expense of slower write performance. The quick strategy has a number of requirements:
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* The disks must be of type qcow2
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* The base domain must be turned off
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* The base domain must not change after creating the clone
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