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OpenStack Victoria : Neutron ネットワークを構成する (FLAT)2020/11/17

 
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
+-----------+-----------+   +-----------+-----------+   +-----------+-----------+
|    [ 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|(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

Created a new network:
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2020-11-17T05:40:56Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | a055cd15-90ac-4a92-8fee-62125d09f9dc |
| 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                | 4e42859fe8704e8aaddb5369551b6c52     |
| 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                | 2020-11-17T05:40:57Z                 |
+---------------------------+--------------------------------------+

# [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

Created a new subnet:
+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| allocation_pools     | 10.0.0.200-10.0.0.254                |
| cidr                 | 10.0.0.0/24                          |
| created_at           | 2020-11-17T05:41:15Z                 |
| description          |                                      |
| dns_nameservers      | 10.0.0.10                            |
| dns_publish_fixed_ip | None                                 |
| enable_dhcp          | True                                 |
| gateway_ip           | 10.0.0.1                             |
| host_routes          |                                      |
| id                   | ca63331e-13e7-4639-bef0-92a1da48cc89 |
| ip_version           | 4                                    |
| ipv6_address_mode    | None                                 |
| ipv6_ra_mode         | None                                 |
| name                 | subnet1                              |
| network_id           | a055cd15-90ac-4a92-8fee-62125d09f9dc |
| prefix_length        | None                                 |
| project_id           | 4e42859fe8704e8aaddb5369551b6c52     |
| revision_number      | 0                                    |
| segment_id           | None                                 |
| service_types        |                                      |
| subnetpool_id        | None                                 |
| tags                 |                                      |
| updated_at           | 2020-11-17T05:41:15Z                 |
+----------------------+--------------------------------------+

# 設定確認

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

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| a055cd15-90ac-4a92-8fee-62125d09f9dc | sharednet1 | ca63331e-13e7-4639-bef0-92a1da48cc89 |
+--------------------------------------+------------+--------------------------------------+
[3] 任意のユーザーでログインし、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。
# 利用可能な [flavor] 確認

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

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

# 利用可能なイメージ確認

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

+--------------------------------------+---------+--------+
| ID                                   | Name    | Status |
+--------------------------------------+---------+--------+
| 8507b98f-3e9d-4ac9-92f9-9ee8d7f69339 | CentOS8 | active |
+--------------------------------------+---------+--------+

# 利用可能なネットワーク確認

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

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| a055cd15-90ac-4a92-8fee-62125d09f9dc | sharednet1 | ca63331e-13e7-4639-bef0-92a1da48cc89 |
+--------------------------------------+------------+--------------------------------------+

# 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      | 2020-11-17T05:44:20Z                                                         |
| description     | secgroup01                                                                   |
| id              | 684a3bb5-c41c-4ec7-b62a-3e6bc6e10866                                         |
| name            | secgroup01                                                                   |
| project_id      | 8cc9f93ed89f40e28a610d025462c020                                             |
| revision_number | 1                                                                            |
| rules           | created_at='2020-11-17T05:44:20Z', direction='egress', ethertype='IPv4', ... |
|                 | created_at='2020-11-17T05:44:20Z', direction='egress', ethertype='IPv6', ... |
| stateful        | True                                                                         |
| tags            | []                                                                           |
| updated_at      | 2020-11-17T05:44:20Z                                                         |
+-----------------+------------------------------------------------------------------------------+

# 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                                           |
+-------------+-------------------------------------------------+
| fingerprint | 7e:a9:19:01:1b:b8:14:97:87:2a:14:fd:31:72:1c:2e |
| name        | mykey                                           |
| user_id     | bb4ae84eefc04357987ec43b8e93118c                |
+-------------+-------------------------------------------------+

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

[cent@dlp ~(keystone)]$
openstack server create --flavor m1.small --image CentOS8 --security-group secgroup01 --nic net-id=$netID --key-name mykey CentOS-8
[cent@dlp ~(keystone)]$
openstack server list

+--------------------------------------+----------+--------+-----------------------+---------+----------+
| ID                                   | Name     | Status | Networks              | Image   | Flavor   |
+--------------------------------------+----------+--------+-----------------------+---------+----------+
| 496c3ca3-f10e-4d8d-b29f-49db274b2826 | CentOS-8 | ACTIVE | sharednet1=10.0.0.239 | CentOS8 | 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                                |
+-------------------+--------------------------------------+
| created_at        | 2020-11-17T05:47:25Z                 |
| description       |                                      |
| direction         | ingress                              |
| ether_type        | IPv4                                 |
| id                | bae2c23b-1e30-42e5-a452-9cad7584d95f |
| name              | None                                 |
| port_range_max    | None                                 |
| port_range_min    | None                                 |
| project_id        | 8cc9f93ed89f40e28a610d025462c020     |
| protocol          | icmp                                 |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 0                                    |
| security_group_id | 684a3bb5-c41c-4ec7-b62a-3e6bc6e10866 |
| tags              | []                                   |
| updated_at        | 2020-11-17T05:47:25Z                 |
+-------------------+--------------------------------------+

# SSH 許可

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

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| created_at        | 2020-11-17T05:47:57Z                 |
| description       |                                      |
| direction         | ingress                              |
| ether_type        | IPv4                                 |
| id                | e31087a5-340a-41b4-a9ff-dc505e4c4824 |
| name              | None                                 |
| port_range_max    | 22                                   |
| port_range_min    | 22                                   |
| project_id        | 8cc9f93ed89f40e28a610d025462c020     |
| protocol          | tcp                                  |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 0                                    |
| security_group_id | 684a3bb5-c41c-4ec7-b62a-3e6bc6e10866 |
| tags              | []                                   |
| updated_at        | 2020-11-17T05:47:57Z                 |
+-------------------+--------------------------------------+

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

+--------------------------------------+-------------+-----------+-----------+------------+-----------+
| ID                                   | IP Protocol | Ethertype | IP Range  | Port Range | Remote Se |
+--------------------------------------+-------------+-----------+-----------+------------+-----------+
| 0e9a18c5-1fe2-4a1e-b2c2-2ead9959ecde | None        | IPv6      | ::/0      |            | None      |
| 12daa3ff-442b-4634-a592-1211e00d9e01 | None        | IPv4      | 0.0.0.0/0 |            | None      |
| 18baceb3-6585-4f41-8cda-573cfc480116 | None        | IPv4      | 0.0.0.0/0 |            | None      |
| 554cfb39-2e9c-4143-968c-e130654036f6 | None        | IPv6      | ::/0      |            | None      |
| 9848c262-be1f-4fe4-9342-3c39ab862eb8 | None        | IPv6      | ::/0      |            | 23b606... |
| bae2c23b-1e30-42e5-a452-9cad7584d95f | icmp        | IPv4      | 0.0.0.0/0 |            | None      |
| e008a02c-7e1a-4a13-a5c6-f2ffdacfc70d | None        | IPv4      | 0.0.0.0/0 |            | 23b606... |
| e31087a5-340a-41b4-a9ff-dc505e4c4824 | tcp         | IPv4      | 0.0.0.0/0 | 22:22      | None      |
+--------------------------------------+-------------+-----------+-----------+------------+-----------+
[5] インスタンスにログインします。
[cent@dlp ~(keystone)]$
ssh centos@10.0.0.239

The authenticity of host '10.0.0.239 (10.0.0.239)' can't be established.
ECDSA key fingerprint is SHA256:MrZv8Ecki7TpOJPHL/tWEXyQOvv6Z6LHBBknu8pVzgo.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '10.0.0.239' (ECDSA) to the list of known hosts.
[centos@centos-8 ~]$     # ログインできた
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