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OpenStack Dalmatian : Neutron ネットワークを構成する (FLAT)2024/10/10

 

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。
事前に以下のように Control ノードNetwork ノードCompute ノードの 各 Neutron サービスノードを構築済みであることが前提です。

また、当例では Network ノードと Compute ノードが 2 つのネットワークインターフェースを持っているものとします。

------------+--------------------------+--------------------------+------------
            |                          |                          |
        eth0|10.0.0.30             eth0|10.0.0.50             eth0|10.0.0.51
+-----------+-----------+  +-----------+-----------+  +-----------+-----------+
|   [ dlp.srv.world ]   |  | [ network.srv.world ] |  |  [ node01.srv.world ] |
|     (Control Node)    |  |     (Network Node)    |  |     (Compute Node)    |
|                       |  |                       |  |                       |
|  MariaDB    RabbitMQ  |  |  Neutron L2/L3 Agent  |  |        Libvirt        |
|  Memcached  Nginx     |  |   Neutron Metadata    |  |      Nova Compute     |
|  Keystone   httpd     |  |     Open vSwitch      |  |    Neutron L2 Agent   |
|  Glance     Nova API  |  |                       |  |      Open vSwitch     |
|  Neutron Server       |  |                       |  |                       |
|  Neutron Metadata     |  |                       |  |                       |
+-----------------------+  +-----------+-----------+  +-----------+-----------+
                                   eth1|(UP with no IP)       eth1|(UP with no IP)

[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
# [eth1] は環境によって異なるため自身の名称に置き換え

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

[root@network ~]#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# 最終行に追記

[ml2_type_flat]
flat_networks = physnet1
[root@network ~]#
vi /etc/neutron/plugins/ml2/openvswitch_agent.ini
# 最終行に追記

[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、当例では Control ノード上で作業します。
[root@dlp ~(keystone)]#
projectID=$(openstack project list | grep service | awk '{print $2}')
# [sharednet1] という名称のネットワークを作成

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

+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2024-10-10T01:26:10Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | e454c039-d426-4a0a-bafc-3870153df57b |
| 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                | aff8e7e402dc4d9e849bbe0e34fa4538     |
| provider:network_type     | flat                                 |
| provider:physical_network | physnet1                             |
| provider:segmentation_id  | None                                 |
| qos_policy_id             | None                                 |
| revision_number           | 1                                    |
| router:external           | Internal                             |
| segments                  | None                                 |
| shared                    | True                                 |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| updated_at                | 2024-10-10T01:26:10Z                 |
+---------------------------+--------------------------------------+

# [sharednet1] に [10.0.0.0/24] のサブネットを作成

[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

+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| allocation_pools     | 10.0.0.200-10.0.0.254                |
| cidr                 | 10.0.0.0/24                          |
| created_at           | 2024-10-10T01:26:36Z                 |
| description          |                                      |
| dns_nameservers      | 10.0.0.10                            |
| dns_publish_fixed_ip | None                                 |
| enable_dhcp          | True                                 |
| gateway_ip           | 10.0.0.1                             |
| host_routes          |                                      |
| id                   | ca20a1b6-fb65-4a18-8a60-eea6fd5545f4 |
| ip_version           | 4                                    |
| ipv6_address_mode    | None                                 |
| ipv6_ra_mode         | None                                 |
| name                 | subnet1                              |
| network_id           | e454c039-d426-4a0a-bafc-3870153df57b |
| project_id           | aff8e7e402dc4d9e849bbe0e34fa4538     |
| revision_number      | 0                                    |
| router:external      | False                                |
| segment_id           | None                                 |
| service_types        |                                      |
| subnetpool_id        | None                                 |
| tags                 |                                      |
| updated_at           | 2024-10-10T01:26:36Z                 |
+----------------------+--------------------------------------+

# 設定確認

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

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| e454c039-d426-4a0a-bafc-3870153df57b | sharednet1 | ca20a1b6-fb65-4a18-8a60-eea6fd5545f4 |
+--------------------------------------+------------+--------------------------------------+
[3] Openstack システムを利用可能な任意のユーザーでログインし、作成したネットワークでインスタンスを作成/起動します。
# 利用可能な [flavor] 確認

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

+----+-----------+-------+------+-----------+-------+-----------+
| ID | Name      |   RAM | Disk | Ephemeral | VCPUs | Is Public |
+----+-----------+-------+------+-----------+-------+-----------+
| 1  | m1.tiny   |  2048 |   10 |         0 |     1 | True      |
| 2  | m1.small  |  4096 |   10 |         0 |     2 | True      |
| 3  | m1.medium |  8192 |   10 |         0 |     4 | True      |
| 4  | m1.large  | 16384 |   10 |         0 |     8 | True      |
| 5  | m2.large  | 16384 |   10 |        10 |     8 | True      |
+----+-----------+-------+------+-----------+-------+-----------+

# 利用可能なイメージ確認

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

+--------------------------------------+----------------+--------+
| ID                                   | Name           | Status |
+--------------------------------------+----------------+--------+
| 75e0d976-4075-4488-8f26-87d4a50aebe9 | CentOS-Stream9 | active |
+--------------------------------------+----------------+--------+

# 利用可能なネットワーク確認

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

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| e454c039-d426-4a0a-bafc-3870153df57b | sharednet1 | ca20a1b6-fb65-4a18-8a60-eea6fd5545f4 |
+--------------------------------------+------------+--------------------------------------+

# インスタンス用のセキュリティグループを作成

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

+-----------------+----------------------------------------------------------------------------+
| Field           | Value                                                                      |
+-----------------+----------------------------------------------------------------------------+
| created_at      | 2024-10-10T01:28:00Z                                                       |
| description     | secgroup01                                                                 |
| id              | 4da18ab8-3ffc-4ff9-9aa1-2f41a17fe1b4                                       |
| name            | secgroup01                                                                 |
| project_id      | 756e2b4937c44d3991028e294f92d89a                                           |
| revision_number | 1                                                                          |
| rules           | created_at='2024-10-10T01:28:00Z', direction='egress', ethertype='IPv6.... |
|                 | created_at='2024-10-10T01:28:00Z', direction='egress', ethertype='IPv4.... |
| shared          | False                                                                      |
| stateful        | True                                                                       |
| tags            | []                                                                         |
| updated_at      | 2024-10-10T01:28:00Z                                                       |
+-----------------+----------------------------------------------------------------------------+

# インスタンス接続用の SSH キーペア作成

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

Enter file in which to save the key (/home/cent/.ssh/id_rsa):
# 公開鍵登録

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

+-------------+-------------------------------------------------+
| Field       | Value                                           |
+-------------+-------------------------------------------------+
| created_at  | None                                            |
| fingerprint | c4:23:3d:6a:b6:6a:1e:2c:19:e7:c9:ac:07:21:1e:11 |
| id          | mykey                                           |
| is_deleted  | None                                            |
| name        | mykey                                           |
| type        | ssh                                             |
| user_id     | 19c7530debb54eb0bfe6dc47aae3df32                |
+-------------+-------------------------------------------------+

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

[cent@dlp ~(keystone)]$
openstack server create --flavor m1.small --image CentOS-Stream9 --security-group secgroup01 --nic net-id=$netID --key-name mykey CentOS-St9
[cent@dlp ~(keystone)]$
openstack server list

+--------------------------------------+------------+--------+-----------------------+----------------+----------+
| ID                                   | Name       | Status | Networks              | Image          | Flavor   |
+--------------------------------------+------------+--------+-----------------------+----------------+----------+
| 8bb31994-e8a0-429d-a2c4-48292203c1a1 | CentOS-St9 | ACTIVE | sharednet1=10.0.0.223 | CentOS-Stream9 | m1.small |
+--------------------------------------+------------+--------+-----------------------+----------------+----------+
[4] 起動した仮想マシンインスタンスに SSH 接続できるように、先に作成したセキュリティグループにポート許可の設定を追加します。
# ICMP 許可

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

+-------------------------+--------------------------------------+
| Field                   | Value                                |
+-------------------------+--------------------------------------+
| belongs_to_default_sg   | False                                |
| created_at              | 2024-10-10T01:30:39Z                 |
| description             |                                      |
| direction               | ingress                              |
| ether_type              | IPv4                                 |
| id                      | 04e77e8d-017c-4e9a-928f-e0683dc7bf18 |
| name                    | None                                 |
| normalized_cidr         | 0.0.0.0/0                            |
| port_range_max          | None                                 |
| port_range_min          | None                                 |
| project_id              | 756e2b4937c44d3991028e294f92d89a     |
| protocol                | icmp                                 |
| remote_address_group_id | None                                 |
| remote_group_id         | None                                 |
| remote_ip_prefix        | 0.0.0.0/0                            |
| revision_number         | 0                                    |
| security_group_id       | 4da18ab8-3ffc-4ff9-9aa1-2f41a17fe1b4 |
| tags                    | []                                   |
| updated_at              | 2024-10-10T01:30:39Z                 |
+-------------------------+--------------------------------------+

# SSH 許可

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

+-------------------------+--------------------------------------+
| Field                   | Value                                |
+-------------------------+--------------------------------------+
| belongs_to_default_sg   | False                                |
| created_at              | 2024-10-10T01:30:56Z                 |
| description             |                                      |
| direction               | ingress                              |
| ether_type              | IPv4                                 |
| id                      | 5ca88e6c-45af-4ef3-a5bf-6f8ceb0c4d91 |
| name                    | None                                 |
| normalized_cidr         | 0.0.0.0/0                            |
| port_range_max          | 22                                   |
| port_range_min          | 22                                   |
| project_id              | 756e2b4937c44d3991028e294f92d89a     |
| protocol                | tcp                                  |
| remote_address_group_id | None                                 |
| remote_group_id         | None                                 |
| remote_ip_prefix        | 0.0.0.0/0                            |
| revision_number         | 0                                    |
| security_group_id       | 4da18ab8-3ffc-4ff9-9aa1-2f41a17fe1b4 |
| tags                    | []                                   |
| updated_at              | 2024-10-10T01:30:56Z                 |
+-------------------------+--------------------------------------+

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

+--------------------------------------+-------------+-----------+-----------+------------+-----------+-----------------------+----------------------+
| ID                                   | IP Protocol | Ethertype | IP Range  | Port Range | Direction | Remote Security Group | Remote Address Group |
+--------------------------------------+-------------+-----------+-----------+------------+-----------+-----------------------+----------------------+
| 04e77e8d-017c-4e9a-928f-e0683dc7bf18 | icmp        | IPv4      | 0.0.0.0/0 |            | ingress   | None                  | None                 |
| 2b16aba4-7f3d-419a-a8f8-380d6b4a3e10 | None        | IPv6      | ::/0      |            | egress    | None                  | None                 |
| 5ca88e6c-45af-4ef3-a5bf-6f8ceb0c4d91 | tcp         | IPv4      | 0.0.0.0/0 | 22:22      | ingress   | None                  | None                 |
| f50e96bf-3bb4-4a08-815a-57ec3bed582c | None        | IPv4      | 0.0.0.0/0 |            | egress    | None                  | None                 |
+--------------------------------------+-------------+-----------+-----------+------------+-----------+-----------------------+----------------------+
[5] インスタンスにログインします。
[cent@dlp ~(keystone)]$
ssh centos@10.0.0.223

The authenticity of host '10.0.0.223 (10.0.0.223)' can't be established.
ED25519 key fingerprint is SHA256:30looeLzO/7wy8XygCGwPraCDDdbhsPjfqQDiud6+eQ.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '10.0.0.223' (ED25519) to the list of known hosts.
[centos@centos-st9 ~]$     # ログインできた
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