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- How to Launch an Instance from a Volume
- Importing a VHD image that uses linux volume management for its root directory
- OpenStack Network Concepts
- Creating an Instance with a Specific Fixed IP
- OpenStack Mitaka CLI Notes
- Why Choose OpenStack?
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- How to Create An Instance With Static IP
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Creating an Instance with a Specific Fixed IP
You may have a need to create an instance with a specific, private IP address (aka Fixed IP) from your subnet. To do this you must manually create a neutron port. This article outlines the steps that achieve this goal. You will need to utilize either the API or the command line tools to do these steps.
Pre-requisites
- If you are going to use the command line (CLI) tools, ensure you have both of these tools installed. You can find installation instructions for both tools in our knowledge base: Getting started with the OpenStack API
NeutronClientNovaClient
You also must ensure that DHCP is Enabled on your Neutron subnet. DHCP is enabled by default, so unless you’ve specifically disabled it then you shouldn’t need to do this step.
If it is not enabled already, run this command with the NeutronClient to enable it:
neutron subnet-update --enable-dhcp SUBNET_IDExample:
$ neutron subnet-update --enable-dhcp c5cf95c4-3e36-43c0-9b07-bc73e7a4669b
Updated subnet: c5cf95c4-3e36-43c0-9b07-bc73e7a4669bYou should then be able to run the command neutron subnet-show on your subnet and see that the value of enable_dhcp is set to True, as shown in this example:
$ neutron subnet-show c5cf95c4-3e36-43c0-9b07-bc73e7a4669b
+------------------+--------------------------------------------+
| Field | Value |
+------------------+--------------------------------------------+
| allocation_pools | {"start": "10.0.0.2", "end": "10.0.0.254"} |
| cidr | 10.0.0.0/24 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 10.0.0.1 |
| host_routes | |
| id | c5cf95c4-3e36-43c0-9b07-bc73e7a4669b |
| ip_version | 4 |
| name | Test |
| network_id | c435a78b-0928-4683-a545-3ab15f30809c |
| tenant_id | 65589599430509 |
+------------------+--------------------------------------------+Notes: Here is a full list of the commands used to form these calls:
neutron net-list
neutron subnet-list
neutron port-create
neutron port-list
nova flavor-list
nova keypair-list
nova image-list
nova secgroup-list
nova boot
nova listWalkthrough Steps
Create a port
Using the NeutronClient you would start by creating your port with this command:
neutron port-create --fixed-ip subnet_id=SUBNET_ID,ip_address=IP_FROM_POOL --name PORT_NAME NETWORK_IDExample:
Using a subnet with ID 76b3537c-4fbb-4f06-aa8c-795617a0821e and IP pool range of 192.168.0.0/24 on a network with ID b4988d1f-6546-4bb2-afd9-ab9afb211763 yields a command that looks like this one:
$ neutron port-create --fixed-ip subnet_id=76b3537c-4fbb-4f06-aa8c-795617a0821e,ip_address=192.168.0.50 --name fixedtest b4988d1f-6546-4bb2-afd9-ab9afb211763
Created a new port:
+-----------------------+-------------------------------------------------------------------------------------+
| Field | Value |
+-----------------------+-------------------------------------------------------------------------------------+
| admin_state_up | True |
| device_id | |
| device_owner | |
| fixed_ips | {"subnet_id": "76b3537c-4fbb-4f06-aa8c-795617a0821e", "ip_address": "192.168.0.50"} |
| id | cd497879-11a2-41ce-9f01-9a3c9a377ab1 |
| mac_address | fa:16:3e:39:85:a6 |
| name | fixedtest |
| network_id | b4988d1f-6546-4bb2-afd9-ab9afb211763 |
| port_security_enabled | True |
| security_groups | 94b2a4be-3d6e-4687-9ec3-a5c4abde1377 |
| status | ACTIVE |
| tenant_id | 65589599430509 |
+-----------------------+-------------------------------------------------------------------------------------+Optional: Have a floating IP assigned to your port before creating the instance
OPTIONAL: If you want to have a floating IP assigned to your port before creating the instance, this command will do that for you. Floating IPs are used so that your instance will be accessible externally over the internet.
You’ll need to run the command neutron net-list to get the ID of your Ext-Net, which is where the floating IP will be allocated:**
$ neutron net-list
+--------------------------------------+---------+--------------------------------------------------+
| id | name | subnets |
+--------------------------------------+---------+--------------------------------------------------+
| 7da74520-9d5e-427b-a508-213c84e69616 | Ext-Net | ef3bde66-8ac4-4356-8ab4-099519ba218a |
| b4988d1f-6546-4bb2-afd9-ab9afb211763 | Network | 76b3537c-4fbb-4f06-aa8c-795617a0821e 10.0.0.0/24 |
+--------------------------------------+---------+--------------------------------------------------+Run a neutron port-list to get the ID of the port you created in step #1:**
$ neutron port-list
+--------------------------------------+-----------+-------------------+-------------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+-----------+-------------------+-------------------------------------------------------------------------------------+
| 623ee416-b180-490c-83f1-274acf870e17 | | fa:16:3e:c6:9a:9a | {"subnet_id": "c5cf95c4-3e36-43c0-9b07-bc73e7a4669b", "ip_address": "10.0.0.1"} |
| 7c433d21-01d6-417c-8ce5-3744c76856ea | test | fa:16:3e:42:e4:ff | {"subnet_id": "c5cf95c4-3e36-43c0-9b07-bc73e7a4669b", "ip_address": "10.0.0.50"} |
| d96561f0-7ca6-45bc-a59d-1893c832c5a4 | | fa:16:3e:42:c3:7d | {"subnet_id": "c5cf95c4-3e36-43c0-9b07-bc73e7a4669b", "ip_address": "10.0.0.2"} |
+--------------------------------------+-----------+-------------------+-------------------------------------------------------------------------------------+Next you’ll use neutron floatingip-create to both allocate and assign floating IP to your port:**
neutron floatingip-create --port-id PORT_ID NETWORK_ID
NOTE: Ensure the NETWORK_ID you use is the ID for your Ext-Net network.
Example:
$ neutron floatingip-create --port-id 7c433d21-01d6-417c-8ce5-3744c76856ea 7da74520-9d5e-427b-a508-213c84e69616
Created a new floatingip:
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| fixed_ip_address | 10.0.0.50 |
| floating_ip_address | 15.126.215.195 |
| floating_network_id | 7da74520-9d5e-427b-a508-213c84e69616 |
| id | 91ad98e7-08e0-4659-a17f-9102ccae6a53 |
| port_id | 7c433d21-01d6-417c-8ce5-3744c76856ea |
| router_id | cb49e750-d8d6-444a-92e6-ff091266697a |
| tenant_id | 65589599430509 |
+---------------------+--------------------------------------+You can then run a neutron floatingip-list to confirm:
$ neutron floatingip-list
+--------------------------------------+------------------+---------------------+--------------------------------------+
| id | fixed_ip_address | floating_ip_address | port_id |
+--------------------------------------+------------------+---------------------+--------------------------------------+
| 91ad98e7-08e0-4659-a17f-9102ccae6a53 | 10.0.0.50 | 15.126.215.195 | 7c433d21-01d6-417c-8ce5-3744c76856ea |
+--------------------------------------+------------------+---------------------+--------------------------------------+Create an instance
Then using the NovaClient you’d use that port to create the instance with this command:**
nova boot --flavor FLAVOR_ID --key-name KEYPAIR_NAME --image IMAGE_ID --security-groups SECGROUP_ID --nic port-id=PORT_ID INSTANCE_NAMEExample:
$ nova boot --flavor 101 --key-name SupportKey --image 85e8bfdf-d560-4a1b-9711-52692d422927 --security-groups 3ea1c931-4825-444c-9f02-f341a8f50cc5 --nic port-id=cd497879-11a2-41ce-9f01-9a3c9a377ab1 porttest
+-----------------------------+---------------------------------------------------------------------------------------------------+
| Property | Value |
+-----------------------------+---------------------------------------------------------------------------------------------------+
| OS-EXT-AZ:availability_zone | nova |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-STS:task_state | scheduling |
| OS-EXT-STS:vm_state | building |
| accessIPv4 | |
| accessIPv6 | |
| adminPass | i77xQq2knk6D |
| config_drive | |
| created | 2014-08-28T14:39:19Z |
| flavor | standard.small (101) |
| hostId | |
| id | 6cf72910-93e4-4d82-90b1-892a012d6c69 |
| image | Ubuntu Server 12.04.5 LTS (amd64 20140806) - Partner Image (85e8bfdf-d560-4a1b-9711-52692d422927) |
| key_name | SupportKey |
| metadata | {} |
| name | porttest |
| progress | 0 |
| security_groups | 3ea1c931-4825-444c-9f02-f341a8f50cc5 |
| status | BUILD |
| tenant_id | 65589599430509 |
| updated | 2014-08-28T14:39:19Z |
| user_id | 52552375567809 |
+-----------------------------+---------------------------------------------------------------------------------------------------+