CentOS 7
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OpenStack Queens : Neutron Network (FLAT)
2018/03/07
 
Configure virtual networking by OpenStack Network Service (Neutron).
For example, configure FLAT type of provider networking on here.
Before it, Configure basic settings on Control Node, Network Node, Compute Node.
Furthermore, this example is based on the environment that Network Node and Compute Node have 2 network interfaces.
     ------------+---------------------------+---------------------------+------------
                 |                           |                           |
             eth0|10.0.0.30              eth0|10.0.0.50              eth0|10.0.0.51
     +-----------+-----------+   +-----------+-----------+   +-----------+-----------+
     |    [ Control Node ]   |   |    [ Network Node ]   |   |    [ Compute Node ]   |
     |                       |   |                       |   |                       |
     |  MariaDB    RabbitMQ  |   |      Open vSwitch     |   |        Libvirt        |
     |  Memcached  httpd     |   |        L2 Agent       |   |     Nova Compute      |
     |  Keystone   Glance    |   |        L3 Agent       |   |      Open vSwitch     |
     |  Nova API             |   |     Metadata Agent    |   |        L2 Agent       |
     |  Neutron Server       |   |                       |   |                       |
     |  Metadata Agent       |   |                       |   |                       |
     +-----------------------+   +-----------+-----------+   +-----------+-----------+
                                             |eth1                       |eth1

[1] Change settings like follows on both Network Node and Compute Node.
# add bridge

[root@network ~]#
ovs-vsctl add-br br-eth1

# add eth1 to the port of the bridge above

[root@network ~]#
ovs-vsctl add-port br-eth1 eth1

[root@network ~]#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# line 181: add

[ml2_type_flat]
flat_networks = physnet1
[root@network ~]#
vi /etc/neutron/plugins/ml2/openvswitch_agent.ini
# line 194: add

[ovs]
bridge_mappings = physnet1:br-eth1
[root@network ~]#
systemctl restart neutron-openvswitch-agent

[2] Create network. It's OK to work on any node. (This example is on Control Node)
[root@dlp ~(keystone)]#
projectID=$(openstack project list | grep service | awk '{print $2}')
# create network named [sharednet1]

[root@dlp ~(keystone)]#
openstack network create --project $projectID \
--share --provider-network-type flat --provider-physical-network physnet1 sharednet1

Created a new network:
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2018-03-08T04:37:03Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | 5ffea5aa-33d8-4a43-8517-481aedc8c728 |
| ipv4_address_scope        | None                                 |
| ipv6_address_scope        | None                                 |
| is_default                | False                                |
| is_vlan_transparent       | None                                 |
| mtu                       | 1500                                 |
| name                      | sharednet1                           |
| port_security_enabled     | True                                 |
| project_id                | b1da1070c8af427886d0202f8bbe414f     |
| provider:network_type     | flat                                 |
| provider:physical_network | physnet1                             |
| provider:segmentation_id  | None                                 |
| qos_policy_id             | None                                 |
| revision_number           | 2                                    |
| router:external           | Internal                             |
| segments                  | None                                 |
| shared                    | True                                 |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| updated_at                | 2018-03-08T04:37:03Z                 |
+---------------------------+--------------------------------------+

# create subnet [10.0.0.0/24] in [sharednet1]

[root@dlp ~(keystone)]#
openstack subnet create subnet1 --network sharednet1 \
--project $projectID --subnet-range 10.0.0.0/24 \
--allocation-pool start=10.0.0.200,end=10.0.0.254 \
--gateway 10.0.0.1 --dns-nameserver 10.0.0.10

Created a new subnet:
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| allocation_pools  | 10.0.0.200-10.0.0.254                |
| cidr              | 10.0.0.0/24                          |
| created_at        | 2018-03-08T04:37:28Z                 |
| description       |                                      |
| dns_nameservers   | 10.0.0.10                            |
| enable_dhcp       | True                                 |
| gateway_ip        | 10.0.0.1                             |
| host_routes       |                                      |
| id                | ef33af75-9db0-4342-9e8d-e8c487cf3e4a |
| ip_version        | 4                                    |
| ipv6_address_mode | None                                 |
| ipv6_ra_mode      | None                                 |
| name              | subnet1                              |
| network_id        | 5ffea5aa-33d8-4a43-8517-481aedc8c728 |
| project_id        | b1da1070c8af427886d0202f8bbe414f     |
| revision_number   | 0                                    |
| segment_id        | None                                 |
| service_types     |                                      |
| subnetpool_id     | None                                 |
| tags              |                                      |
| updated_at        | 2018-03-08T04:37:28Z                 |
+-------------------+--------------------------------------+

# confirm settings

[root@dlp ~(keystone)]#
openstack network list

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| 5ffea5aa-33d8-4a43-8517-481aedc8c728 | sharednet1 | ef33af75-9db0-4342-9e8d-e8c487cf3e4a |
+--------------------------------------+------------+--------------------------------------+
[3] Login with a user and Create and start a Virtual machine Instance with the network just created above.
# show flavor list

[cent@dlp ~(keystone)]$
openstack flavor list

+----+----------+------+------+-----------+-------+-----------+
| ID | Name     |  RAM | Disk | Ephemeral | VCPUs | Is Public |
+----+----------+------+------+-----------+-------+-----------+
| 0  | m1.small | 2048 |   10 |         0 |     1 | True      |
+----+----------+------+------+-----------+-------+-----------+

# show image list

[cent@dlp ~(keystone)]$
openstack image list

+--------------------------------------+---------+--------+
| ID                                   | Name    | Status |
+--------------------------------------+---------+--------+
| 88551fbc-ce7e-4719-a67a-dd7cad478019 | CentOS7 | active |
+--------------------------------------+---------+--------+

# show network list

[cent@dlp ~(keystone)]$
openstack network list

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| 5ffea5aa-33d8-4a43-8517-481aedc8c728 | sharednet1 | ef33af75-9db0-4342-9e8d-e8c487cf3e4a |
+--------------------------------------+------------+--------------------------------------+

# create a security group for instances

[cent@dlp ~(keystone)]$
openstack security group create secgroup01

+-----------------+-------------------------------------------------------------------------------+
| Field           | Value                                                                         |
+-----------------+-------------------------------------------------------------------------------+
| created_at      | 2018-03-08T04:42:07Z                                                          |
| description     | secgroup01                                                                    |
| id              | d32a7faf-8de1-4a30-8d95-c8efa6b72548                                          |
| name            | secgroup01                                                                    |
| project_id      | e2236920f07b4fedb55d4ea454173b79                                              |
| revision_number | 2                                                                             |
| rules           | created_at='2018-03-08T04:42:07Z', direction='egress', ethertype='IPv6', ...' |
|                 | created_at='2018-03-08T04:42:07Z', direction='egress', ethertype='IPv4', ...' |
| updated_at      | 2018-03-08T04:42:07Z                                                          |
+-----------------+-------------------------------------------------------------------------------+

# create a SSH keypair for connecting to instances

[cent@dlp ~(keystone)]$
ssh-keygen -q -N ""

Enter file in which to save the key (/home/cent/.ssh/id_rsa):
# add public-key

[cent@dlp ~(keystone)]$
openstack keypair create --public-key ~/.ssh/id_rsa.pub mykey

+-------------+-------------------------------------------------+
| Field       | Value                                           |
+-------------+-------------------------------------------------+
| fingerprint | 36:fe:4c:e4:7f:a3:27:1a:f7:a3:4f:fa:b9:a6:16:92 |
| name        | mykey                                           |
| user_id     | a1ecf467167542bdb615ba4311f4bf0a                |
+-------------+-------------------------------------------------+

[cent@dlp ~(keystone)]$
netID=$(openstack network list | grep sharednet1 | awk '{ print $2 }')

[cent@dlp ~(keystone)]$
openstack server create --flavor m1.small --image CentOS7 --security-group secgroup01 --nic net-id=$netID --key-name mykey CentOS_7
[cent@dlp ~(keystone)]$
openstack server list

+--------------------------------------+----------+--------+-----------------------+---------+----------+
| ID                                   | Name     | Status | Networks              | Image   | Flavor   |
+--------------------------------------+----------+--------+-----------------------+---------+----------+
| 2a890645-1249-42fe-bb54-99d43f1bee82 | CentOS_7 | ACTIVE | sharednet1=10.0.0.208 | CentOS7 | m1.small |
+--------------------------------------+----------+--------+-----------------------+---------+----------+
[4] Configure security settings for the security group you created above to access with SSH and ICMP.
# permit ICMP

[cent@dlp ~(keystone)]$
openstack security group rule create --protocol icmp --ingress secgroup01

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| created_at        | 2018-03-08T04:51:13Z                 |
| description       |                                      |
| direction         | ingress                              |
| ether_type        | IPv4                                 |
| id                | 3fbcdca5-c5db-40b6-87f8-f09ddd952434 |
| name              | None                                 |
| port_range_max    | None                                 |
| port_range_min    | None                                 |
| project_id        | e2236920f07b4fedb55d4ea454173b79     |
| protocol          | icmp                                 |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 0                                    |
| security_group_id | d32a7faf-8de1-4a30-8d95-c8efa6b72548 |
| updated_at        | 2018-03-08T04:51:13Z                 |
+-------------------+--------------------------------------+

# permit SSH

[cent@dlp ~(keystone)]$
openstack security group rule create --protocol tcp --dst-port 22:22 secgroup01

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| created_at        | 2018-03-08T04:51:30Z                 |
| description       |                                      |
| direction         | ingress                              |
| ether_type        | IPv4                                 |
| id                | 88c61ff7-4dfc-42f4-bd70-744a42afa712 |
| name              | None                                 |
| port_range_max    | 22                                   |
| port_range_min    | 22                                   |
| project_id        | e2236920f07b4fedb55d4ea454173b79     |
| protocol          | tcp                                  |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 0                                    |
| security_group_id | d32a7faf-8de1-4a30-8d95-c8efa6b72548 |
| updated_at        | 2018-03-08T04:51:30Z                 |
+-------------------+--------------------------------------+

[cent@dlp ~(keystone)]$
openstack security group rule list

+--------------+-------------+-----------+------------+-----------------------------+---------------------+
| ID           | IP Protocol | IP Range  | Port Range | Remote Security Group       | Security Group      |
+--------------+-------------+-----------+------------+-----------------------------+---------------------+
| 1bf389ef-... | None        | None      |            | 7d6d93eb-05b0-4dd7-87cb-... | 7d6d93eb-05b0-4d... |
| 3fbcdca5-... | icmp        | 0.0.0.0/0 |            | None                        | d32a7faf-8de1-4a... |
| 5e217486-... | None        | None      |            | 7d6d93eb-05b0-4dd7-87cb-... | 7d6d93eb-05b0-4d... |
| 68c424ae-... | None        | None      |            | None                        | 7d6d93eb-05b0-4d... |
| 88c61ff7-... | tcp         | 0.0.0.0/0 | 22:22      | None                        | d32a7faf-8de1-4a... |
| 8f685930-... | None        | None      |            | None                        | 7d6d93eb-05b0-4d... |
| aa9dbb1d-... | None        | None      |            | None                        | d32a7faf-8de1-4a... |
| f730d562-... | None        | None      |            | None                        | d32a7faf-8de1-4a... |
+--------------+-------------+-----------+------------+-----------------------------+---------------------+
[5] Login to Instance.
[cent@dlp ~(keystone)]$
ssh centos@10.0.0.208

The authenticity of host '10.0.0.208 (10.0.0.208)' can't be established.
ECDSA key fingerprint is SHA256:xHIBEd/rhh5IPJGv7rXS/VmbM+4i2FJMA6UWPA0UUT8.
ECDSA key fingerprint is MD5:5b:01:d5:5a:40:c5:1a:d7:05:40:f6:96:0a:db:52:6d.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.0.0.208' (ECDSA) to the list of known hosts.
[centos@centos-7 ~]$    
# just logined
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