Certified OpenStack Administrator Study Guide by Unknown

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Chapter 6 OpenStaCk netwOrking

Figure 6-6. Network Topology tab in Horizon

At this point, you have only one missing part. Your instances within the tenant network can connect to each other, but none of the instances can reach out to an external network. You need to add a floating IP from ext-net to the virtual machine.

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Chapter 6 OpenStaCk netwOrking

First, let’s create the floating IP. The default quota for the number of floating IPs is 10, which can be adjusted by anyone with admin capacity.

$ openstack floating ip create ext-net

+---------------------+--------------------------------------+

| Field | Value |

+---------------------+--------------------------------------+

| created_at | 2022-07-17T18:35:34Z |

| description | |

| dns_domain | |

| dns_name | |

| fixed_ip_address | None |

| floating_ip_address | 192.168.122.215 |

| floating_network_id | 5f18929b-70f6-4729-ac05-7bea494b9c5a |

| id | e41419bf-7642-4cc5-9569-cd7d546e0f62 |

| name | 192.168.122.215 |

| port_details | None |

| port_id | None |

| project_id | 9e0c535c2240405b989afa450681df18 |

| qos_policy_id | None |

| revision_number | 0 |

| router_id | None |

| status | DOWN |

| subnet_id | None |

| tags | [] |

| updated_at | 2022-07-17T18:35:34Z |

+---------------------+--------------------------------------+

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Chapter 6 OpenStaCk netwOrking

Take a moment to locate the IP of the new floating IP from the output. You will need this IP soon. Next, determine which current IP is associated with the virtual machine.

$ openstack server list

+--------------------------------------+-------------+--------+

-----------------------+--------------------------+---------+

| ID | Name | Status |

Networks | Image | Flavor |

+--------------------------------------+-------------+--------+

-----------------------+--------------------------+---------+

| f6fda94b-a6d2-43cc-8e93-18a538759a22 | apressinst1 | ACTIVE |

demo-net=172.16.0.224 | N/A (booted from volume) | m1.tiny |

+--------------------------------------+-------------+--------+

-----------------------+--------------------------+---------+

Now you can associate the floating IP with the server.

$ openstack server add floating ip apressinst1 192.168.122.215

Let’s confirm that the VM got the new IP. The following shows the second external IP

and the virtual machine properties.

$ openstack server list

+--------------------------------------+-------------+--------+

----------------------------------------+--------------------------+----------+

| ID | Name | Status |

Networks | Image | Flavor |

+--------------------------------------+-------------+--------+

----------------------------------------+--------------------------+----------+

| f6fda94b-a6d2-43cc-8e93-18a538759a22 | apressinst1 | ACTIVE |

demo-net=172.16.0.224, 192.168.122.215 | N/A (booted from volume) | m1.tiny |

+--------------------------------------+-------------+--------+

----------------------------------------+--------------------------+----------+

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