Managing the instances

List the running instances

% openstack server list
+------+-------------+--------+----------------------+
|  ID  |     Name    | Status |       Networks       |
+------+-------------+--------+----------------------+
| 2064 | Server 2064 | ACTIVE | vlan5=134.158.246.8  |
| 2065 | Server 2065 | ACTIVE | vlan5=134.158.246.12 |
| 2078 | Server 2067 | ACTIVE | vlan5=134.158.246.13 |
| 2079 | Server 2068 | ACTIVE | vlan5=134.158.246.10 |
+------+-------------+--------+----------------------+

Note

Remember to normalize the names of your instances, it will be easier to find them using a regular expression and the parameter –name

Instantiate the VMs

To boot a basic instance:

% openstack server create --flavor cc.basic --image cc-sl6.x86_64 --key_name mykey myserver
+--------------+--------------------------------------+
|   Property   |                Value                 |
+--------------+--------------------------------------+
| accessIPv4   |                                      |
| accessIPv6   |                                      |
| adminPass    | XXXXXXXXXXXXXXXX                     |
| config_drive |                                      |
| created      | 2012-07-06T09:30:22Z                 |
| flavor       | cc.basic                             |
| hostId       |                                      |
| id           | 2079                                 |
| image        | cc-sl6.x86_64                        |
| key_name     | mykey                                |
| metadata     | {}                                   |
| name         | myserver                             |
| progress     | 0                                    |
| status       | BUILD                                |
| tenant_id    | demotenant                           |
| updated      | 2012-07-06T09:30:23Z                 |
| user_id      | demouser                             |
| uuid         | e455d901-510c-4a37-86a3-e7458cadd3ab |
+--------------+--------------------------------------+
  • cc-sl6.x86_64: name of the image to be instantiated (list the available images with euca- describe-images)
  • mykey: name of the SSH key created previously
  • cc.basic: chosen instance type

Check available instance types for more information on flavor.

Delete an instance

Deleting an instance is like turning off the virtual machine. Changes made to the image will be lost (unless you make a snapshot beforehand).

% openstack server delete myserver

Pause an instance

Pause a VM is like freezing it, like a STOP signal for a Unix process. Memory resources are still used:

% openstack server pause myserver
% openstack server list
+--------------+------------+--------+------------------------------------+
|      ID      |    Name    | Status |              Networks              |
+--------------+------------+--------+------------------------------------+
| ad4c5a21c5e5 | myserver   | PAUSED | ccin2p3=172.17.0.14, 134.158.246.4 |
+--------------+------------+--------+------------------------------------+

Restart a paused instance

% openstack server unpause myserver
% openstack server list
+--------------+------------+--------+------------------------------------+
|      ID      |    Name    | Status |              Networks              |
+--------------+------------+--------+------------------------------------+
| ad4c5a21c5e5 | myserver   | ACTIVE | ccin2p3=172.17.0.14, 134.158.246.4 |
+--------------+------------+--------+------------------------------------+

Suspend an instance

Once a VM is suspended, a snapshot of its memory and disk is taken and the machine is deleted. With the exception of the stored snapshots, the instance is not consuming any resource:

% openstack server suspend myserver
% openstack server list
+--------------+------------+-----------+------------------------------------+
|      ID      |    Name    | Status    |              Networks              |
+--------------+------------+-----------+------------------------------------+
| ad4c5a21c5e5 | myserver   | SUSPENDED | ccin2p3=172.17.0.14, 134.158.246.4 |
+--------------+------------+-----------+------------------------------------+

Restart a suspended instance

% openstack server resume myserver
% openstack server list
+--------------+------------+--------+------------------------------------+
|      ID      |    Name    | Status |              Networks              |
+--------------+------------+--------+------------------------------------+
| ad4c5a21c5e5 | myserver  | ACTIVE | ccin2p3=172.17.0.14, 134.158.246.4 |
+--------------+------------+--------+------------------------------------+