163 lines
6.3 KiB
ReStructuredText
163 lines
6.3 KiB
ReStructuredText
================
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Launch instances
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================
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Instances are virtual machines that run inside the cloud.
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Before you can launch an instance, gather the following parameters:
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- The **instance source** can be an image, snapshot, or block storage
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volume that contains an image or snapshot.
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- A **name** for your instance.
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- The **flavor** for your instance, which defines the compute, memory,
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and storage capacity of nova computing instances. A flavor is an
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available hardware configuration for a server. It defines the size of
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a virtual server that can be launched.
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- Any **user data** files. A user data file is a special key in the
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metadata service that holds a file that cloud-aware applications in
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the guest instance can access. For example, one application that uses
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user data is the
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`cloud-init <https://help.ubuntu.com/community/CloudInit>`__ system,
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which is an open-source package from Ubuntu that is available on
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various Linux distributions and that handles early initialization of
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a cloud instance.
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- Access and security credentials, which include one or both of the
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following credentials:
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- A **key pair** for your instance, which are SSH credentials that
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are injected into images when they are launched. For the key pair
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to be successfully injected, the image must contain the
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``cloud-init`` package. Create at least one key pair for each
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project. If you already have generated a key pair with an external
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tool, you can import it into OpenStack. You can use the key pair
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for multiple instances that belong to that project.
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- A **security group** that defines which incoming network traffic
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is forwarded to instances. Security groups hold a set of firewall
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policies, known as *security group rules*.
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- If needed, you can assign a **floating (public) IP address** to a
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running instance.
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- You can also attach a block storage device, or **volume**, for
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persistent storage.
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.. note::
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Instances that use the default security group cannot, by default, be
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accessed from any IP address outside of the cloud. If you want those
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IP addresses to access the instances, you must modify the rules for
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the default security group.
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You can also assign a floating IP address to a running instance to
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make it accessible from outside the cloud. See
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:doc:`cli-manage-ip-addresses`.
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After you gather the parameters that you need to launch an instance,
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you can launch it from an :doc:`image<cli-nova-launch-instance-from-image>`
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or a :doc:`volume<cli-nova-launch-instance-from-volume>`. You can launch an
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instance directly from one of the available OpenStack images or from
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an image that you have copied to a persistent volume. The OpenStack
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Image service provides a pool of images that are accessible to members
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of different projects.
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Gather parameters to launch an instance
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Before you begin, source the OpenStack RC file.
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#. List the available flavors.
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.. code-block:: console
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$ openstack flavor list
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Note the ID of the flavor that you want to use for your instance::
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+-----+-----------+-------+------+-----------+-------+-----------+
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| ID | Name | RAM | Disk | Ephemeral | VCPUs | Is_Public |
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+-----+-----------+-------+------+-----------+-------+-----------+
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| 1 | m1.tiny | 512 | 1 | 0 | 1 | True |
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| 2 | m1.small | 2048 | 20 | 0 | 1 | True |
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| 3 | m1.medium | 4096 | 40 | 0 | 2 | True |
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| 4 | m1.large | 8192 | 80 | 0 | 4 | True |
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| 5 | m1.xlarge | 16384 | 160 | 0 | 8 | True |
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+-----+-----------+-------+------+-----------+-------+-----------+
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#. List the available images.
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.. code-block:: console
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$ openstack image list
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Note the ID of the image from which you want to boot your instance::
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+--------------------------------------+---------------------------------+--------+
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| ID | Name | Status |
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+--------------------------------------+---------------------------------+--------+
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| 397e713c-b95b-4186-ad46-6126863ea0a9 | cirros-0.3.2-x86_64-uec | active |
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| df430cc2-3406-4061-b635-a51c16e488ac | cirros-0.3.2-x86_64-uec-kernel | active |
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| 3cf852bd-2332-48f4-9ae4-7d926d50945e | cirros-0.3.2-x86_64-uec-ramdisk | active |
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+--------------------------------------+---------------------------------+--------+
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You can also filter the image list by using :command:`grep` to find a specific
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image, as follows:
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.. code-block:: console
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$ openstack image list | grep 'kernel'
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| df430cc2-3406-4061-b635-a51c16e488ac | cirros-0.3.2-x86_64-uec-kernel | active |
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#. List the available security groups.
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.. code-block:: console
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$ openstack security group list
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.. note::
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If you are an admin user, this command will list groups for all tenants.
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Note the ID of the security group that you want to use for your instance::
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+--------------------------------------+---------+------------------------+----------------------------------+
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| ID | Name | Description | Project |
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+--------------------------------------+---------+------------------------+----------------------------------+
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| b0d78827-0981-45ef-8561-93aee39bbd9f | default | Default security group | 5669caad86a04256994cdf755df4d3c1 |
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| ec02e79e-83e1-48a5-86ad-14ab9a8c375f | default | Default security group | 1eaaf6ede7a24e78859591444abf314a |
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+--------------------------------------+---------+------------------------+----------------------------------+
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If you have not created any security groups, you can assign the instance
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to only the default security group.
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You can view rules for a specified security group:
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.. code-block:: console
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$ openstack security group rule list default
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#. List the available key pairs, and note the key pair name that you use for
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SSH access.
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.. code-block:: console
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$ openstack keypair list
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Launch an instance
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~~~~~~~~~~~~~~~~~~
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You can launch an instance from various sources.
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.. toctree::
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:maxdepth: 2
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cli-nova-launch-instance-from-image.rst
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cli-nova-launch-instance-from-volume.rst
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cli-nova-launch-instance-using-ISO-image.rst
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