Step 12: A usable VM
Start
Even though we already created a VM in Step 7, that VM was not usable as it wasn’t connected to a network, let alone the internet. Let’s create one that we can actually log in to.
Installation
To create this VM, we’ll add some parameters to the command we used in Step 7:
$ openstack server create BeispielInstanz --flavor m1.small --key-name Beispiel --image "Ubuntu 16.04 Xenial Xerus - Latest" --security-group allow-ssh-from-anywhere --network=BeispielNetzwerk
+-----------------------------+---------------------------------------------------------------------------+
| Field | Value |
+-----------------------------+---------------------------------------------------------------------------+
| OS-DCF:diskConfig | MANUAL |
| OS-EXT-AZ:availability_zone | es1 |
| OS-EXT-STS:power_state | NOSTATE |
| OS-EXT-STS:task_state | scheduling |
| OS-EXT-STS:vm_state | building |
| OS-SRV-USG:launched_at | None |
| OS-SRV-USG:terminated_at | None |
| accessIPv4 | |
| accessIPv6 | |
| addresses | |
| config_drive | |
| created | 2017-12-08T12:52:37Z |
| flavor | m1.small (b7c4fa0b-7960-4311-a86b-507dbf58e8ac) |
| hostId | |
| id | 1de98aa4-7d2b-4427-a8a5-d369ea8bdaf5 |
| image | Ubuntu 16.04 Xenial Xerus - Latest (82242d21-d990-4fc2-92a5-c7bd7820e790) |
| key_name | Beispiel |
| name | BeispielInstanz |
| progress | 0 |
| project_id | b15cde70d85749689e08106f973bb002 |
| properties | |
| security_groups | name='allow-ssh-from-anywhere' |
| status | BUILD |
| updated | 2017-12-08T12:52:37Z |
| user_id | 9bf501f4c3d14b7eb0f1443efe80f656 |
| volumes_attached | |
+-----------------------------+---------------------------------------------------------------------------+
These parameters are included:
--flavor: The flavor of the the VM. You can get all available flavors withopenstack flavor list--key-name: The key to install on the VM.--image: The operating system image to install on the VM. You can get all available images withopenstack image list--security-group: Specifies the security group.--network: Specify the network to attach the VM to.
If we want to reach our VM from the internet, we’ll nee a floating IP address.
Let’s create one:
$ openstack floating ip create provider
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| created_at | 2017-12-08T12:53:37Z |
| description | |
| fixed_ip_address | None |
| floating_ip_address | 185.116.245.65 |
| floating_network_id | 54258498-a513-47da-9369-1a644e4be692 |
| id | 84eca140-9ac1-42c3-baf6-860ba920a23c |
| name | None |
| port_id | None |
| project_id | b15cde70d85749689e08106f973bb002 |
| revision_number | 0 |
| router_id | None |
| status | DOWN |
| updated_at | 2017-12-08T12:53:37Z |
+---------------------+--------------------------------------+
The created IP must be associated with our vm:
$ openstack server add floating ip BeispielInstanz 185.116.245.145
Usage
We now should have a reachable VM.
To see if all worked correctly, let’s try to log in to our VM via SSH.
IMPORTANT: We can only log in if the specified ssh key exists and is accessible. (If this doesn’t work, follow the guide in step 6)
$ ssh ubuntu@185.116.245.145
The authenticity of host '185.116.245.145 (185.116.245.145)' can't be established.
ECDSA key fingerprint is SHA256:kbSkm8eJA0748911RkbWK2/pBVQOjJBASD1oOOXalk.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '185.116.245.145' (ECDSA) to the list of known hosts.
Enter passphrase for key '/Users/ubuntu/.ssh/id_rsa':
Clean-Up
If we want to delete all the parts we just created, we’ll have to delete them in a logical order.
If we don’t delete them in the order, we will not be allowed to delete components that other components depend on.
- Instance
openstack server delete BeispielInstanz
- Floating-IP
openstack floating ip delete 185.116.245.145
- Router Port
openstack port delete BeispielPort
- Router
openstack router delete BeispielRouter
- Subnet
openstack subnet delete BeispielSubnet
- Network
openstack network delete BeispielNetzwerk
Conclusion
We have now created a VM based on our knowledge from steps from 7 to 11, it’s reachable from the internet and we’ve logged in via SSH!
In the next step, we break away from individual instances and create a stack.