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OpenStack Rocky : Neutron ネットワークを構成する (FLAT)
2018/08/31
 
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 ノードが二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

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

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

[ml2_type_flat]
flat_networks = physnet1
[root@network ~]#
vi /etc/neutron/plugins/ml2/openvswitch_agent.ini
# 194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、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                | 2018-08-31T06:00:22Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | 31b6274c-cdf7-4381-b0f2-f3cd238efac2 |
| 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                | ece4ac6c7e764a979e36ba0b2faf848e     |
| provider:network_type     | flat                                 |
| provider:physical_network | physnet1                             |
| provider:segmentation_id  | None                                 |
| qos_policy_id             | None                                 |
| revision_number           | 0                                    |
| router:external           | Internal                             |
| segments                  | None                                 |
| shared                    | True                                 |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| updated_at                | 2018-08-31T06:00:23Z                 |
+---------------------------+--------------------------------------+

# [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        | 2018-08-31T06:00:50Z                 |
| description       |                                      |
| dns_nameservers   | 10.0.0.10                            |
| enable_dhcp       | True                                 |
| gateway_ip        | 10.0.0.1                             |
| host_routes       |                                      |
| id                | f0745084-3229-484c-ba89-51865a17db42 |
| ip_version        | 4                                    |
| ipv6_address_mode | None                                 |
| ipv6_ra_mode      | None                                 |
| name              | subnet1                              |
| network_id        | 31b6274c-cdf7-4381-b0f2-f3cd238efac2 |
| project_id        | ece4ac6c7e764a979e36ba0b2faf848e     |
| revision_number   | 0                                    |
| segment_id        | None                                 |
| service_types     |                                      |
| subnetpool_id     | None                                 |
| tags              |                                      |
| updated_at        | 2018-08-31T06:00:50Z                 |
+-------------------+--------------------------------------+

# 設定確認

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

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| 31b6274c-cdf7-4381-b0f2-f3cd238efac2 | sharednet1 | f0745084-3229-484c-ba89-51865a17db42 |
+--------------------------------------+------------+--------------------------------------+
[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 |
+--------------------------------------+---------+--------+
| 05269b20-9625-46b6-8377-3893c70906bd | CentOS7 | active |
+--------------------------------------+---------+--------+

# 利用可能なネットワーク確認

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

+--------------------------------------+------------+--------------------------------------+
| ID                                   | Name       | Subnets                              |
+--------------------------------------+------------+--------------------------------------+
| 31b6274c-cdf7-4381-b0f2-f3cd238efac2 | sharednet1 | f0745084-3229-484c-ba89-51865a17db42 |
+--------------------------------------+------------+--------------------------------------+

# 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      | 2018-08-31T06:03:46Z                                                                                                                                  |
| description     | secgroup01                                                                                                                                            |
| id              | a45a7ec0-fa37-4477-921e-54cdccfe0aee                                                                                                                  |
| name            | secgroup01                                                                                                                                            |
| project_id      | cabdf1684bf8495289ba64f16281d8cd                                                                                                                      |
| revision_number | 1                                                                                                                                                     |
| rules           | created_at='2018-08-31T06:03:46Z', direction='egress', ethertype='IPv4', id='39139c6c-5453-4f98-9b64-9f51b7a6f043', updated_at='2018-08-31T06:03:46Z' |
|                 | created_at='2018-08-31T06:03:47Z', direction='egress', ethertype='IPv6', id='7906ac2b-5261-43f8-a3b1-b9726ef555bc', updated_at='2018-08-31T06:03:47Z' |
| tags            | []                                                                                                                                                    |
| updated_at      | 2018-08-31T06:03:46Z                                                                                                                                  |
+-----------------+-------------------------------------------------------------------------------------------------------------------------------------------------------+

# 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 | 0b:3d:7f:df:8a:06:95:8f:7c:91:18:99:44:6b:59:4c |
| name        | mykey                                           |
| user_id     | 5da9a7ce84334c71bddaf7ebc2e34ead                |
+-------------+-------------------------------------------------+

[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   |
+--------------------------------------+----------+--------+-----------------------+---------+----------+
| 0ecc07c2-197d-4863-ad50-d2846dcb7cca | CentOS_7 | ACTIVE | sharednet1=10.0.0.204 | CentOS7 | 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        | 2018-08-31T06:05:44Z                 |
| description       |                                      |
| direction         | ingress                              |
| ether_type        | IPv4                                 |
| id                | bbd5b382-845e-4e06-bbc1-6bbf8a11dd84 |
| name              | None                                 |
| port_range_max    | None                                 |
| port_range_min    | None                                 |
| project_id        | cabdf1684bf8495289ba64f16281d8cd     |
| protocol          | icmp                                 |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 0                                    |
| security_group_id | a45a7ec0-fa37-4477-921e-54cdccfe0aee |
| updated_at        | 2018-08-31T06:05:44Z                 |
+-------------------+--------------------------------------+

# SSH 許可

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

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| created_at        | 2018-08-31T06:06:00Z                 |
| description       |                                      |
| direction         | ingress                              |
| ether_type        | IPv4                                 |
| id                | 24cadf7c-963d-4ab5-b730-ec2b32f88234 |
| name              | None                                 |
| port_range_max    | 22                                   |
| port_range_min    | 22                                   |
| project_id        | cabdf1684bf8495289ba64f16281d8cd     |
| protocol          | tcp                                  |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 0                                    |
| security_group_id | a45a7ec0-fa37-4477-921e-54cdccfe0aee |
| updated_at        | 2018-08-31T06:06:00Z                 |
+-------------------+--------------------------------------+

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

+--------------------------------------+-------------+-----------+------------+--------------------------------------+--------------------------------------+
| ID                                   | IP Protocol | IP Range  | Port Range | Remote Security Group                | Security Group                       |
+--------------------------------------+-------------+-----------+------------+--------------------------------------+--------------------------------------+
| 24cadf7c-963d-4ab5-b730-ec2b32f88234 | tcp         | 0.0.0.0/0 | 22:22      | None                                 | a45a7ec0-fa37-4477-921e-54cdccfe0aee |
| 39139c6c-5453-4f98-9b64-9f51b7a6f043 | None        | None      |            | None                                 | a45a7ec0-fa37-4477-921e-54cdccfe0aee |
| 613a6466-552d-4e7c-9d12-7ae2d0328d9f | None        | None      |            | fed8b67f-a614-441d-a898-12b554d5007d | fed8b67f-a614-441d-a898-12b554d5007d |
| 7906ac2b-5261-43f8-a3b1-b9726ef555bc | None        | None      |            | None                                 | a45a7ec0-fa37-4477-921e-54cdccfe0aee |
| bbd5b382-845e-4e06-bbc1-6bbf8a11dd84 | icmp        | 0.0.0.0/0 |            | None                                 | a45a7ec0-fa37-4477-921e-54cdccfe0aee |
| c127b405-3c40-4cdd-b7b2-96cf22e7d6b3 | None        | None      |            | fed8b67f-a614-441d-a898-12b554d5007d | fed8b67f-a614-441d-a898-12b554d5007d |
| e960b3f5-4008-4fb6-b3c9-da617554826c | None        | None      |            | None                                 | fed8b67f-a614-441d-a898-12b554d5007d |
| f3fbe6ae-4f6f-4761-a1d5-cd473d556f48 | None        | None      |            | None                                 | fed8b67f-a614-441d-a898-12b554d5007d |
+--------------------------------------+-------------+-----------+------------+--------------------------------------+--------------------------------------+
[5] インスタンスにログインします。
[cent@dlp ~(keystone)]$
ssh centos@10.0.0.204

The authenticity of host '10.0.0.204 (10.0.0.204)' can't be established.
ECDSA key fingerprint is SHA256:a6aknOruK4Or1IjIZbgYgp+IswyON5L7gjQtGpG0SVw.
ECDSA key fingerprint is MD5:1f:b0:09:b7:eb:3b:54:ff:3f:e2:9d:b3:46:20:08:e7.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.0.0.204' (ECDSA) to the list of known hosts.
[centos@centos-7 ~]$    
# ログインできた
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