This section creates the necessary virtual networks to support launching instances. Networking option 1 includes one provider (external) network with one instance that uses it. Networking option 2 includes one provider network with one instance that uses it and one self-service (private) network with one instance that uses it. The instructions in this section use command-line interface (CLI) tools on the controller node. For more information on the CLI tools, see the OpenStack End User Guide. To use the dashboard, see the OpenStack End User Guide.
Create virtual networks for the networking option that you chose in Networking service. If you chose option 1, create only the provider network. If you chose option 2, create the provider and self-service networks.
After creating the appropriate networks for your environment, you can continue preparing the environment to launch an instance.
The smallest default flavor consumes 512 MB memory per instance. For environments with compute nodes containing less than 4 GB memory, we recommend creating the m1.nano flavor that only requires 64 MB per instance. Only use this flavor with the CirrOS image for testing purposes.
$ openstack flavor create --id 0 --vcpus 1 --ram 64 --disk 1 m1.nano
+----------------------------+---------+
| Field | Value |
+----------------------------+---------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| disk | 1 |
| id | 0 |
| name | m1.nano |
| os-flavor-access:is_public | True |
| ram | 64 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 1 |
+----------------------------+---------+
Most cloud images support public key authentication rather than conventional password authentication. Before launching an instance, you must add a public key to the Compute service.
Source the demo tenant credentials:
$ . demo-openrc
Generate and add a key pair:
$ ssh-keygen -q -N ""
$ openstack keypair create --public-key ~/.ssh/id_rsa.pub mykey
+-------------+-------------------------------------------------+
| Field | Value |
+-------------+-------------------------------------------------+
| fingerprint | ee:3d:2e:97:d4:e2:6a:54:6d:0d:ce:43:39:2c:ba:4d |
| name | mykey |
| user_id | 58126687cbcc4888bfa9ab73a2256f27 |
+-------------+-------------------------------------------------+
Note
Alternatively, you can skip the ssh-keygen command and use an existing public key.
Verify addition of the key pair:
$ openstack keypair list
+-------+-------------------------------------------------+
| Name | Fingerprint |
+-------+-------------------------------------------------+
| mykey | ee:3d:2e:97:d4:e2:6a:54:6d:0d:ce:43:39:2c:ba:4d |
+-------+-------------------------------------------------+
By default, the default security group applies to all instances and includes firewall rules that deny remote access to instances. For Linux images such as CirrOS, we recommend allowing at least ICMP (ping) and secure shell (SSH).
Add rules to the default security group:
Permit ICMP (ping):
$ openstack security group rule create --proto icmp default
+-----------------------+--------------------------------------+
| Field | Value |
+-----------------------+--------------------------------------+
| id | a1876c06-7f30-4a67-a324-b6b5d1309546 |
| ip_protocol | icmp |
| ip_range | 0.0.0.0/0 |
| parent_group_id | b0d53786-5ebb-4729-9e4a-4b675016a958 |
| port_range | |
| remote_security_group | |
+-----------------------+--------------------------------------+
Permit secure shell (SSH) access:
$ openstack security group rule create --proto tcp --dst-port 22 default
+-----------------------+--------------------------------------+
| Field | Value |
+-----------------------+--------------------------------------+
| id | 3d95e59c-e98d-45f1-af04-c750af914f14 |
| ip_protocol | tcp |
| ip_range | 0.0.0.0/0 |
| parent_group_id | b0d53786-5ebb-4729-9e4a-4b675016a958 |
| port_range | 22:22 |
| remote_security_group | |
+-----------------------+--------------------------------------+
If you chose networking option 1, you can only launch an instance on the provider network. If you chose networking option 2, you can launch an instance on the provider network and the self-service network.
If your environment includes the Block Storage service, you can create a volume and attach it to an instance.
If your environment includes the Orchestration service, you can create a stack that launches an instance.
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