CentOS 7
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OpenStack Liberty : Configure Networking
2015/11/15
 
Configure Networking for Virtual Machine Instances.
[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=10.1.0.0/24

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

id   IPv4         IPv6  start address   DNS1      DNS2  VlanID  project  uuid     
1    10.1.0.0/24  None  10.1.0.2        10.0.0.1  None  None    None     00e71469-
[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 Liberty : 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)]#
systemctl restart openstack-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    eno16777736
None    10.0.0.250      None    nova    eno16777736
None    10.0.0.251      None    nova    eno16777736
None    10.0.0.252      None    nova    eno16777736
None    10.0.0.253      None    nova    eno16777736
None    10.0.0.254      None    nova    eno16777736
[5] Create a new instance and boot 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 boot Instance

[root@dlp ~(keystone)]#
nova boot --flavor 2 --image CentOS7 --security_group default CentOS7_Pub

[root@dlp ~(keystone)]#
nova list

+-----------+-------------+---------+------------+-------------+--------------------------------+
| ID        | Name        | Status  | Task State | Power State | Networks                       |
+-----------+-------------+---------+------------+-------------+--------------------------------+
| f753ef80- | CentOS7_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           |
+-----------+-----------+---------+------------+-------------+--------------------+
| 29d99611- | CentOS_7  | SHUTOFF | -          | Shutdown    | network01=10.1.0.2 |
+-----------+-----------+---------+------------+-------------+--------------------+

# assign "10.0.0.250" to "CentOS_7"

[root@dlp ~(keystone)]#
nova floating-ip-associate CentOS_7 10.0.0.250

[root@dlp ~(keystone)]#
nova list

+-----------+-----------+---------+------------+-------------+--------------------------------+
| ID        | Name      | Status  | Task State | Power State | Networks                       |
+-----------+-----------+---------+------------+-------------+--------------------------------+
| 29d99611- | CentOS_7  | SHUTOFF | -          | Shutdown    | network01=10.1.0.2, 10.0.0.250 |
+-----------+-----------+---------+------------+-------------+--------------------------------+
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