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OpenStack Mitaka (三鷹) : Neutron ネットワーク構成 (FLAT)
2016/04/28
 
OpenStack Network Service(Neutron)による仮想ネットワークの構成です。
例として、FLAT タイプのプロバイダーネットワークを構成します。
Control ノードNetwork ノードCompute ノードはそれぞれ事前に基本設定をしておいてください。
また、Network ノードと Compute ノードはネットワークインターフェースを二つ持っていることを前提とします。

                                        |
  +-------------+                  +----+----+
  | Name Server |                  | Gateway |
  +------+------+                  +----+----+
         |10.0.0.10                     |10.0.0.1
         |                              |
         +------------+-----------------+------------------+
         |            |                 |                  |     10.0.0.200-10.0.0.250
     eth0|10.0.0.30   |             eth0|10.0.0.50         |         +-----------------+
+--------+---------+  |     +-----------+----------+       |     +---| Virtual Machine |
| [ Control Node ] |  |     |   [ Network Node ]   |       |     |   +-----------------+
|     Keystone     |  |     |       DHCP Agent     |       |     |   +-----------------+
|      Glance      |  |     |       L3 Agent       |eth1   |     |---| Virtual Machine |
|     Nova API     |  |     |       L2 Agent       |       |     |   +-----------------+
|  Neutron Server  |  |     |    Metadata Agent    |       |     |   +-----------------+
+------------------+  |     +----------------------+       +-----+---| Virtual Machine |
                      |                                          |   +-----------------+
                      |     +----------------------+             |   +-----------------+
                      | eth0|   [ Compute Node ]   |             |---| Virtual Machine |
                      +-----|     Nova Compute     |eth1         |   +-----------------+
                   10.0.0.51|       L2 Agent       |             |   +-----------------+
                            +----------------------+             +---| Virtual Machine |
                                                                     +-----------------+

[1] Network ノード、および Compute ノードの両方で以下のように設定します。
# ブリッジ追加

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

# 追加したブリッジのポートにeth1を追加

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

[root@network ~]#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# 152行目:追記

[ml2_type_flat]
flat_networks = physnet1
[root@network ~]#
vi /etc/neutron/plugins/ml2/openvswitch_agent.ini
# 176行目:追記

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

[2] ネットワークを作成します。作業場所はどこでもよいですが、ここでは Control ノード上で作業します。
[root@dlp ~(keystone)]#
tenantID=`openstack project list | grep service | awk '{print $2}'`
# 「sharednet1」という名前のネットワークを作成

[root@dlp ~(keystone)]#
neutron net-create --tenant-id $tenantID sharednet1 \
--shared --provider:network_type flat --provider:physical_network physnet1

Created a new network:
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | True                                 |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2016-04-29T09:20:28                  |
| description               |                                      |
| id                        | 2ac59cb1-3d1c-45a4-a9af-2957274432bc |
| ipv4_address_scope        |                                      |
| ipv6_address_scope        |                                      |
| mtu                       | 1500                                 |
| name                      | sharednet1                           |
| port_security_enabled     | True                                 |
| provider:network_type     | flat                                 |
| provider:physical_network | physnet1                             |
| provider:segmentation_id  |                                      |
| router:external           | False                                |
| shared                    | True                                 |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| tenant_id                 | 4a80b177558b49d7a58038770a344aeb     |
| updated_at                | 2016-04-29T09:20:28                  |
+---------------------------+--------------------------------------+

# 作成した「sharednet1」に「10.0.0.0/24」のサブネットを作成

[root@dlp ~(keystone)]#
neutron subnet-create \
--tenant-id $tenantID --gateway 10.0.0.1 --dns-nameserver 10.0.0.1 \
--allocation-pool start=10.0.0.200,end=10.0.0.250 sharednet1 10.0.0.0/24

Created a new subnet:
+-------------------+----------------------------------------------+
| Field             | Value                                        |
+-------------------+----------------------------------------------+
| allocation_pools  | {"start": "10.0.0.200", "end": "10.0.0.250"} |
| cidr              | 10.0.0.0/24                                  |
| created_at        | 2016-04-29T09:21:03                          |
| description       |                                              |
| dns_nameservers   | 10.0.0.1                                     |
| enable_dhcp       | True                                         |
| gateway_ip        | 10.0.0.1                                     |
| host_routes       |                                              |
| id                | 8db73b65-6792-4f46-8872-1a9cec5e7957         |
| ip_version        | 4                                            |
| ipv6_address_mode |                                              |
| ipv6_ra_mode      |                                              |
| name              |                                              |
| network_id        | 2ac59cb1-3d1c-45a4-a9af-2957274432bc         |
| subnetpool_id     |                                              |
| tenant_id         | 4a80b177558b49d7a58038770a344aeb             |
| updated_at        | 2016-04-29T09:21:03                          |
+-------------------+----------------------------------------------+

# 設定確認

[root@dlp ~(keystone)]#
neutron net-list

+--------------------------------------+------------+--------------------------------------------------+
| id                                   | name       | subnets                                          |
+--------------------------------------+------------+--------------------------------------------------+
| 2ac59cb1-3d1c-45a4-a9af-2957274432bc | sharednet1 | 8db73b65-6792-4f46-8872-1a9cec5e7957 10.0.0.0/24 |
+--------------------------------------+------------+--------------------------------------------------+
[3] 作成したネットワークをインスタンスに紐付けてインスタンスを作成・起動します。
[root@dlp ~(keystone)]#
netID=`neutron net-list | grep sharednet1 | awk '{print $2}'`

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

+--------------------------------------+---------+--------+--------+
| ID                                   | Name    | Status | Server |
+--------------------------------------+---------+--------+--------+
| cd41a1b9-9ba6-4681-9310-e4befaf71fa5 | CentOS7 | ACTIVE |        |
+--------------------------------------+---------+--------+--------+

[root@dlp ~(keystone)]#
nova boot --flavor 2 --image CentOS7 --security-groups default --nic net-id=$netID CentOS_7
[root@dlp ~(keystone)]#
nova list

+-----------+----------+--------+------------+-------------+-----------------------+
| ID        | Name     | Status | Task State | Power State | Networks              |
+-----------+----------+--------+------------+-------------+-----------------------+
| 6f6b330b- | CentOS_7 | ACTIVE | -          | Running     | sharednet1=10.0.0.201 |
+-----------+----------+--------+------------+-------------+-----------------------+
[4] 起動した仮想マシンインスタンスにSSHで接続できるように、デフォルトセキュリティグループにポート許可の設定をしておきます。
# ICMP 許可

[root@dlp ~(keystone)]#
neutron security-group-rule-create --direction ingress --protocol icmp default

Created a new security_group_rule:
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| description       |                                      |
| direction         | ingress                              |
| ethertype         | IPv4                                 |
| id                | 2ee46326-17cf-4b0a-89ff-84d91e5522db |
| port_range_max    |                                      |
| port_range_min    |                                      |
| protocol          | icmp                                 |
| remote_group_id   |                                      |
| remote_ip_prefix  |                                      |
| security_group_id | daeb3c1f-67e1-4129-990c-49ca0504f841 |
| tenant_id         | 7a160aeddebd4e398fd22e6491f10baa     |
+-------------------+--------------------------------------+

# SSH 許可

[root@dlp ~(keystone)]#
neutron security-group-rule-create --direction ingress --protocol tcp --port_range_min 22 --port_range_max 22 default

Created a new security_group_rule:
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| description       |                                      |
| direction         | ingress                              |
| ethertype         | IPv4                                 |
| id                | e99bc736-a85c-4471-ba43-105b4cb8bd99 |
| port_range_max    | 22                                   |
| port_range_min    | 22                                   |
| protocol          | tcp                                  |
| remote_group_id   |                                      |
| remote_ip_prefix  |                                      |
| security_group_id | daeb3c1f-67e1-4129-990c-49ca0504f841 |
| tenant_id         | 7a160aeddebd4e398fd22e6491f10baa     |
+-------------------+--------------------------------------+

[root@dlp ~(keystone)]#
neutron security-group-rule-list

+--------------------------------------+----------------+-----------+-----------+---------------+-----------------+
| id                                   | security_group | direction | ethertype | port/protocol | remote          |
+--------------------------------------+----------------+-----------+-----------+---------------+-----------------+
| 2ee46326-17cf-4b0a-89ff-84d91e5522db | default        | ingress   | IPv4      | icmp          | any             |
| 312684a0-534d-4053-98ed-ce8ddfd529f4 | default        | ingress   | IPv6      | any           | default (group) |
| 4ea4aa8d-792c-438f-966e-d01386786e97 | default        | egress    | IPv6      | any           | any             |
| 5761e89a-f57f-48c6-866a-11a7f1a0e719 | default        | ingress   | IPv4      | any           | default (group) |
| 988eba63-3fb0-456d-a94a-c21aab5fedf3 | default        | egress    | IPv4      | any           | any             |
| e99bc736-a85c-4471-ba43-105b4cb8bd99 | default        | ingress   | IPv4      | 22/tcp        | any             |
+--------------------------------------+----------------+-----------+-----------+---------------+-----------------+
[5] インスタンスにログインします。
[root@dlp ~(keystone)]#
ssh 10.0.0.201

The authenticity of host '10.0.0.201 (10.0.0.201)' can't be established.
ECDSA key fingerprint is 00:e7:be:4a:ff:1f:08:da:a5:86:23:51:5c:30:86:73.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.0.0.201' (ECDSA) to the list of known hosts.
root@10.0.0.201's password:
Last login: Fri Apr 29 02:31:00 2016
[root@host-10-0-0-201 ~]#    
# ログインできた
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