Adding a keypair

Starting an instance

• To start an instance, we need to specify a flavor, also known as an instance type, which indicates the size of an instance. Use the nova flavor-list command to view the list of available flavors:

# nova flavor-list
+----+-----------+-----------+------+-----------+------+-------+-------------+
| ID |    Name   | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor |
+----+-----------+-----------+------+-----------+------+-------+-------------+
| 1  | m1.tiny   | 512       | 0    | 0         |      | 1     | 1.0         |
| 2  | m1.small  | 2048      | 10   | 20        |      | 1     | 1.0         |
| 3  | m1.medium | 4096      | 10   | 40        |      | 2     | 1.0         |
| 4  | m1.large  | 8192      | 10   | 80        |      | 4     | 1.0         |
| 5  | m1.xlarge | 16384     | 10   | 160       |      | 8     | 1.0         |
+----+-----------+-----------+------+-----------+------+-------+-------------+

• We also need to specify the image. Use the nova image-list to retrieve the ID of the CirrOS image.

# nova image-list
+--------------------------------------+---------------------+--------+--------+
|                  ID                  |         Name        | Status | Server |
+--------------------------------------+---------------------+--------+--------+
| 3db3e2dc-9d2f-40ff-8519-af7d04f8146a | tty-linux-ramdisk   | ACTIVE |        |
| 8393828d-b226-434c-b0ea-179674fa4329 | tty-linux-kernel    | ACTIVE |        |
| ba70321b-7bb9-4fc5-a2d4-406fdd8d589d | cirros-0.3.0-x86_64 | ACTIVE |        |
| df3422c6-58f5-4d3d-8de2-b1b522ab4152 | tty-linux           | ACTIVE |        |
+--------------------------------------+---------------------+--------+--------+

• Use the nova boot command to launch a new virtual machine instance. We'll use an m1.small instance in this example, using the CirrOS image. We also need to give this virtual machine instance a name, we'll call it cirros. We will explicitly specify the default security group in this example, although this isn't strictly necessary since the default group will be used if no security group is specified.