Ubuntu 16.04
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OpenStack Newton : Configure Networking
2016/11/15
 
Configure Networking for Virtual Machine Instances.
The follows is for the case you set legacy nova-network in the section [3]. But If you use Neutron Networking, it's unnecessarry to refer to this section.
[1] Create network which instances use in OpenStack internal system.
# nova-manage network create --label (any name) --dns1 (DNS server) --fixed_range_v4=(internal range)

root@dlp ~(keystone)#
nova-manage network create --label network01 --dns1 10.0.0.1 --fixed_range_v4=10.1.0.0/26

root@dlp ~(keystone)#
nova-manage network list

id   IPv4          IPv6   start address   DNS1       DNS2    VlanID   project    uuid
1    10.1.0.0/26   None   10.1.0.2        10.0.0.1   None    None     None       617f979f-
[2] Change default security rules to access to instances with SSH.
# permit SSH

root@dlp ~(keystone)#
nova secgroup-add-rule default tcp 22 22 0.0.0.0/0

+-------------+-----------+---------+-----------+--------------+
| IP Protocol | From Port | To Port | IP Range  | Source Group |
+-------------+-----------+---------+-----------+--------------+
| tcp         | 22        | 22      | 0.0.0.0/0 |              |
+-------------+-----------+---------+-----------+--------------+

# permit ICMP

root@dlp ~(keystone)#
nova secgroup-add-rule default icmp -1 -1 0.0.0.0/0

+-------------+-----------+---------+-----------+--------------+
| IP Protocol | From Port | To Port | IP Range  | Source Group |
+-------------+-----------+---------+-----------+--------------+
| icmp        | -1        | -1      | 0.0.0.0/0 |              |
+-------------+-----------+---------+-----------+--------------+

root@dlp ~(keystone)#
nova secgroup-list-rules default

+-------------+-----------+---------+-----------+--------------+
| IP Protocol | From Port | To Port | IP Range  | Source Group |
+-------------+-----------+---------+-----------+--------------+
| tcp         | 22        | 22      | 0.0.0.0/0 |              |
| icmp        | -1        | -1      | 0.0.0.0/0 |              |
+-------------+-----------+---------+-----------+--------------+
OpenStack Newton : Set Floating IP
 
It's possible to access to Virtual machine Instance from external network to set Floating IP address.
[3] Change Nova's setting first to assign Floating IP address automatically.
root@dlp ~(keystone)#
vi /etc/nova/nova.conf
# add follows in the [DEFAULT] section

auto_assign_floating_ip = True
root@dlp ~(keystone)#
initctl restart nova-network

[4] Set Floating IP address. For exmaple, assign 10.0.0.248/29 for Floating IP addresses in internal network 10.0.0.0/24.
root@dlp ~(keystone)#
nova-manage floating create --ip_range=10.0.0.248/29

root@dlp ~(keystone)#
nova-manage floating list

None    10.0.0.249      None    nova    eth0
None    10.0.0.250      None    nova    eth0
None    10.0.0.251      None    nova    eth0
None    10.0.0.252      None    nova    eth0
None    10.0.0.253      None    nova    eth0
None    10.0.0.254      None    nova    eth0
[5] Create a new instance and start it, then Floating IP is assgined automatically like follows. In the example below, The "10.0.0.249" is just the Floating IP.
# create and start Instance

root@dlp ~(keystone)#
nova boot --flavor 2 --image Ubuntu1604 --security_group default Ubuntu_1604_Pub

root@dlp ~(keystone)#
nova list

+-----------+-----------------+---------+------------+-------------+--------------------------------+
| ID        | Name            | Status  | Task State | Power State | Networks                       |
+-----------+-----------------+---------+------------+-------------+--------------------------------+
| e9f8d504- | Ubuntu_1604_Pub | ACTIVE  | -          | Running     | network01=10.1.0.3, 10.0.0.249 |
+-----------+-----------------+---------+------------+-------------+--------------------------------+
[6] If you assign Floating IP manually to an instance, configure like follows.
root@dlp ~(keystone)#
nova list

+-----------+-----------------+---------+------------+-------------+--------------------------------+
| ID        | Name            | Status  | Task State | Power State | Networks                       |
+-----------+-----------------+---------+------------+-------------+--------------------------------+
| 422fb31d- | Ubuntu_1604     | SHUTOFF | -          | Shutdown    | network01=10.1.0.2             |
+-----------+-----------------+---------+------------+-------------+--------------------------------+

# assign "10.0.0.250" to Ubuntu_1604

root@dlp ~(keystone)#
nova floating-ip-associate Ubuntu_1604 10.0.0.250

root@dlp ~(keystone)#
nova list

+-----------+-----------------+---------+------------+-------------+--------------------------------+
| ID        | Name            | Status  | Task State | Power State | Networks                       |
+-----------+-----------------+---------+------------+-------------+--------------------------------+
| 422fb31d- | Ubuntu_1604     | SHUTOFF | -          | Shutdown    | network01=10.1.0.2, 10.0.0.250 |
+-----------+-----------------+---------+------------+-------------+--------------------------------+
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