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Applies to SUSE OpenStack Cloud Crowbar 8

3 Launching Instances from the SUSE OpenStack Cloud Dashboard

Instances are virtual machines that run inside the cloud. To start an instance, a virtual machine image must exist that contains the following information: which operating system to use, a user name and password with which to log in to the instance, file storage, etc. The cloud contains a pool of such images that have been uploaded to OpenStack Image and are accessible to members of different projects.

3.1 Key Parameters

When starting an instance, specify the following key parameters:


In OpenStack, flavors define the compute, memory, and storage capacity of nova computing instances. To put it simply, a flavor is an available hardware configuration for a server. It defines the size of a virtual server that can be launched.

For more details and a list of default flavors available, see Section 14.11, “Manage flavors” and Section 4.6, “Manage flavors”.

Key Pair (optional, but recommended)

Key Pairs are SSH credentials that are injected into images when they are launched. For this to work, the image must contain the cloud-init package.

It is recommended to create at least one key pair per project. If you already have generated a key pair with an external tool, you can import it into OpenStack. The key pair can be used for multiple instances belonging to that project.

For details, see Section 14.6, “Manage project security”.

Security Group

In SUSE OpenStack Cloud Crowbar, security groups are used to define which incoming network traffic should be forwarded to instances. Security groups hold a set of firewall policies (security group rules).

For details, see Section 14.6, “Manage project security”.


Instances can belong to one or multiple networks. By default, each instance is given a fixed IP address, belonging to the internal network.

Boot Source of the Instance

You can launch instances from the following sources. For details, see Chapter 14, OpenStack command-line clients.

  • Images that have been uploaded to SUSE OpenStack Cloud Crowbar.

  • Volumes that contain images.

  • Instance snapshots.

  • Volume snapshots.

3.2 Launching Instances from Images, Snaphots, or Volumes

For instructions on how to launch instances from images or snapshots, see Launch an Instance.

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