Booting an ImageAfter you've configured the Compute service, you
can now launch an instance. An instance is a virtual machine provisioned by
OpenStack on one of the Compute servers. Use the procedure below to launch a
low-resource instance using an image you've already downloaded.This procedure assumes you have:
Appropriate environment
variables set to specify your credentials (see
Downloaded an image (see ).
Configured networking (see ).
Launch a Compute instanceGenerate a keypair consisting of a private key and a public key to be able to launch instances
on OpenStack. These keys are injected into the instances to make
password-less SSH access to the instance. This depends on the way the
necessary tools are bundled into the images. For more details, see
"Manage instances" in the
Administration User Guide.$ssh-keygen$cd .ssh$nova keypair-add --pub_key id_rsa.pub mykeyYou have just created a new keypair called mykey. The private key id_rsa is
saved locally in ~/.ssh which can be used to connect to an instance
launched using mykey as the keypair. You can view available keypairs
using the nova keypair-list command.$nova keypair-list+-------+-------------------------------------------------+
| Name | Fingerprint |
+-------+-------------------------------------------------+
| mykey | b0:18:32:fa:4e:d4:3c:1b:c4:6c:dd:cb:53:29:13:82 |
| mykey2 | b0:18:32:fa:4e:d4:3c:1b:c4:6c:dd:cb:53:29:13:82 |
+-------+-------------------------------------------------+To launch an instance using OpenStack, you must specify the ID for the flavor you want to use
for the instance. A flavor is a resource allocation profile. For
example, it specifies how many virtual CPUs and how much RAM your
instance will get. To see a list of the available profiles, run the
nova flavor-list command.$nova flavor-list+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+
| 1 | m1.tiny | 512 | 1 | 0 | | 1 | 1.0 | True |
| 2 | m1.small | 2048 | 20 | 0 | | 1 | 1.0 | True |
| 3 | m1.medium | 4096 | 40 | 0 | | 2 | 1.0 | True |
| 4 | m1.large | 8192 | 80 | 0 | | 4 | 1.0 | True |
| 5 | m1.xlarge | 16384 | 160 | 0 | | 8 | 1.0 | True |
+----+-----------+-----------+------+-----------+------+-------+-------------+-----------+Get the ID of the image you would like to use for the instance using the
nova image-list command.$ nova image-list
+--------------------------------------+--------------+--------+--------+
| ID | Name | Status | Server |
+--------------------------------------+--------------+--------+--------+
| 9e5c2bee-0373-414c-b4af-b91b0246ad3b | CirrOS 0.3.1 | ACTIVE | |
+--------------------------------------+--------------+--------+--------+Create the instance using the nova boot.
$nova boot --flavor flavorType --key_name keypairName --image IDnewInstanceNameCreate
an instance using flavor 1 or 2, for example:$nova boot --flavor 1 --key_name mykey --image 9e5c2bee-0373-414c-b4af-b91b0246ad3b cirrOS+--------------------------------------+--------------------------------------+
| Property | Value |
+--------------------------------------+--------------------------------------+
| OS-EXT-STS:task_state | scheduling |
| image | CirrOS 0.3.1 |
| OS-EXT-STS:vm_state | building |
| OS-EXT-SRV-ATTR:instance_name | instance-00000001 |
| OS-SRV-USG:launched_at | None |
| flavor | m1.tiny |
| id | 3bdf98a0-c767-4247-bf41-2d147e4aa043 |
| security_groups | [{u'name': u'default'}] |
| user_id | 530166901fa24d1face95cda82cfae56 |
| OS-DCF:diskConfig | MANUAL |
| accessIPv4 | |
| accessIPv6 | |
| progress | 0 |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-AZ:availability_zone | nova |
| config_drive | |
| status | BUILD |
| updated | 2013-10-10T06:47:26Z |
| hostId | |
| OS-EXT-SRV-ATTR:host | None |
| OS-SRV-USG:terminated_at | None |
| key_name | mykey |
| OS-EXT-SRV-ATTR:hypervisor_hostname | None |
| name | cirrOS |
| adminPass | DWCdW6FnsKNq |
| tenant_id | e66d97ac1b704897853412fc8450f7b9 |
| created | 2013-10-10T06:47:23Z |
| os-extended-volumes:volumes_attached | [] |
| metadata | {} |
+--------------------------------------+--------------------------------------+If there is not enough RAM available for the instance, Compute will create the instance, but
will not start it (status 'Error').After the instance has been created, it will show up in the output of nova
list (as the instance is booted up, the status will change from 'BUILD' to
'ACTIVE').$nova list+--------------------------------------+--------+--------+----------------------+
| ID | Name | Status | Networks |
+--------------------------------------+--------+--------+----------------------+
| 3bdf98a0-c767-4247-bf41-2d147e4aa043 | cirrOS | BUILD | demonet=192.168.0.11 |
+--------------------------------------+--------+--------+----------------------+$nova list+--------------------------------------+--------+--------+----------------------+
| ID | Name | Status | Networks |
+--------------------------------------+--------+--------+----------------------+
| 3bdf98a0-c767-4247-bf41-2d147e4aa043 | cirrOS | ACTIVE | demonet=192.168.0.11 |
+--------------------------------------+--------+--------+----------------------+You can also retrieve additional details about the specific instance using the
nova show command.$nova show 3bdf98a0-c767-4247-bf41-2d147e4aa043Once enough time has passed so that the instance is fully booted and initialized,
you can ssh into the instance. You can obtain the IP address of the instance from the
output of nova list.$ ssh -i mykey root@192.168.0.11