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OpenStack Dalmatian : Neutron ネットワークを構成する (Geneve)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、Geneve カプセル化による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  |  |      Open vSwitch     |  |        Libvirt        |
|  Memcached  Nginx     |  |     Neutron Server    |  |      Nova Compute     |
|  Keystone   httpd     |  |      OVN-Northd       |  |      Open vSwitch     |
|  Glance     Nova API  |  |         Nginx         |  |   OVN Metadata Agent  |
|                       |  |                       |  |     OVN-Controller    |
+-----------------------+  +-----------+-----------+  +-----------+-----------+
                                   eth1|(UP with no IP)       eth1|(UP with no IP)

[1] Network ノードと Compute ノードの両方でブリッジマッピングを設定しておきます。
# ブリッジ作成 (名称は任意)

[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環境に置き換え

[root@network ~]#
ovs-vsctl add-port br-eth1 eth1
# ブリッジと [physnet1] をマッピング ([physnet1] の名称は任意)

[root@network ~]#
ovs-vsctl set open . external-ids:ovn-bridge-mappings=physnet1:br-eth1

[2] 仮想ルーターを作成します。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)]#
openstack router create router01

+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2024-10-10T03:38:50Z                 |
| description               |                                      |
| enable_default_route_bfd  | False                                |
| enable_default_route_ecmp | False                                |
| enable_ndp_proxy          | None                                 |
| external_gateway_info     | null                                 |
| external_gateways         | []                                   |
| flavor_id                 | None                                 |
| ha                        | True                                 |
| id                        | a566d09f-e159-436d-8942-4c13dee793ed |
| name                      | router01                             |
| project_id                | b19d04cd37254937a4eaebcd0f0f0a43     |
| revision_number           | 1                                    |
| routes                    |                                      |
| status                    | ACTIVE                               |
| tags                      |                                      |
| tenant_id                 | b19d04cd37254937a4eaebcd0f0f0a43     |
| updated_at                | 2024-10-10T03:38:50Z                 |
+---------------------------+--------------------------------------+
[3] 内部用のネットワークを作成し、仮想ルーターに関連付けます。
# 内部用ネットワーク作成

[root@dlp ~(keystone)]#
openstack network create private --provider-network-type geneve

+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2024-10-10T03:39:14Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | aa200aa9-ddb2-4d89-aa37-ce3e3a939421 |
| ipv4_address_scope        | None                                 |
| ipv6_address_scope        | None                                 |
| is_default                | False                                |
| is_vlan_transparent       | None                                 |
| mtu                       | 1442                                 |
| name                      | private                              |
| port_security_enabled     | True                                 |
| project_id                | b19d04cd37254937a4eaebcd0f0f0a43     |
| provider:network_type     | geneve                               |
| provider:physical_network | None                                 |
| provider:segmentation_id  | 42184                                |
| qos_policy_id             | None                                 |
| revision_number           | 1                                    |
| router:external           | Internal                             |
| segments                  | None                                 |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| updated_at                | 2024-10-10T03:39:14Z                 |
+---------------------------+--------------------------------------+

# 内部用ネットワークにサブネット作成

[root@dlp ~(keystone)]#
openstack subnet create private-subnet --network private \
--subnet-range 192.168.100.0/24 --gateway 192.168.100.1 \
--dns-nameserver 10.0.0.10

+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| allocation_pools     | 192.168.100.2-192.168.100.254        |
| cidr                 | 192.168.100.0/24                     |
| created_at           | 2024-10-10T03:39:37Z                 |
| description          |                                      |
| dns_nameservers      | 10.0.0.10                            |
| dns_publish_fixed_ip | None                                 |
| enable_dhcp          | True                                 |
| gateway_ip           | 192.168.100.1                        |
| host_routes          |                                      |
| id                   | dfb0949d-d775-4c17-9b07-b01ac7d71aac |
| ip_version           | 4                                    |
| ipv6_address_mode    | None                                 |
| ipv6_ra_mode         | None                                 |
| name                 | private-subnet                       |
| network_id           | aa200aa9-ddb2-4d89-aa37-ce3e3a939421 |
| project_id           | b19d04cd37254937a4eaebcd0f0f0a43     |
| revision_number      | 0                                    |
| router:external      | False                                |
| segment_id           | None                                 |
| service_types        |                                      |
| subnetpool_id        | None                                 |
| tags                 |                                      |
| updated_at           | 2024-10-10T03:39:37Z                 |
+----------------------+--------------------------------------+

# 仮想ルーターに内部ネットワークを設定

[root@dlp ~(keystone)]#
openstack router add subnet router01 private-subnet
[4] 外部接続用のネットワークを作成し、仮想ルーターに関連付けます。
# 外部用ネットワーク作成

[root@dlp ~(keystone)]#
openstack network create \
--provider-physical-network physnet1 \
--provider-network-type flat --external public

+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2024-10-10T03:40:08Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | 7302c07e-c543-4a85-a955-d6cc8a4e4011 |
| ipv4_address_scope        | None                                 |
| ipv6_address_scope        | None                                 |
| is_default                | False                                |
| is_vlan_transparent       | None                                 |
| mtu                       | 1500                                 |
| name                      | public                               |
| port_security_enabled     | True                                 |
| project_id                | b19d04cd37254937a4eaebcd0f0f0a43     |
| provider:network_type     | flat                                 |
| provider:physical_network | physnet1                             |
| provider:segmentation_id  | None                                 |
| qos_policy_id             | None                                 |
| revision_number           | 1                                    |
| router:external           | External                             |
| segments                  | None                                 |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| updated_at                | 2024-10-10T03:40:08Z                 |
+---------------------------+--------------------------------------+

# 外部用ネットワークにサブネット作成

[root@dlp ~(keystone)]#
openstack subnet create public-subnet \
--network public --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 --no-dhcp

+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| allocation_pools     | 10.0.0.200-10.0.0.254                |
| cidr                 | 10.0.0.0/24                          |
| created_at           | 2024-10-10T03:40:31Z                 |
| description          |                                      |
| dns_nameservers      | 10.0.0.10                            |
| dns_publish_fixed_ip | None                                 |
| enable_dhcp          | False                                |
| gateway_ip           | 10.0.0.1                             |
| host_routes          |                                      |
| id                   | 8fbc394a-e821-47d8-8efc-d5f7c7db0ff8 |
| ip_version           | 4                                    |
| ipv6_address_mode    | None                                 |
| ipv6_ra_mode         | None                                 |
| name                 | public-subnet                        |
| network_id           | 7302c07e-c543-4a85-a955-d6cc8a4e4011 |
| project_id           | b19d04cd37254937a4eaebcd0f0f0a43     |
| revision_number      | 0                                    |
| router:external      | True                                 |
| segment_id           | None                                 |
| service_types        |                                      |
| subnetpool_id        | None                                 |
| tags                 |                                      |
| updated_at           | 2024-10-10T03:40:31Z                 |
+----------------------+--------------------------------------+

# 仮想ルーターにゲートウェイを設定

[root@dlp ~(keystone)]#
openstack router set router01 --external-gateway public

[5] 作成したネットワークは、外部用はデフォルトで全プロジェクトがアクセス可能ですが、内部用はデフォルトでは [admin] プロジェクトのみがアクセス可能なため、内部ネットワークを利用させたいプロジェクトにアクセス権限を付与しておきます。
# ネットワーク RBAC リスト表示

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

+--------------------------------------+-------------+--------------------------------------+
| ID                                   | Object Type | Object ID                            |
+--------------------------------------+-------------+--------------------------------------+
| 5fba4cb5-6753-40c1-81cf-5e806cdaa112 | network     | 7302c07e-c543-4a85-a955-d6cc8a4e4011 |
+--------------------------------------+-------------+--------------------------------------+

# RBAC の詳細
# [access_as_external] のみ全プロジェクトがアクセス可能な状態

[root@dlp ~(keystone)]#
openstack network rbac show 5fba4cb5-6753-40c1-81cf-5e806cdaa112

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| action            | access_as_external                   |
| id                | 5fba4cb5-6753-40c1-81cf-5e806cdaa112 |
| object_id         | 7302c07e-c543-4a85-a955-d6cc8a4e4011 |
| object_type       | network                              |
| project_id        | b19d04cd37254937a4eaebcd0f0f0a43     |
| target_project_id | *                                    |
+-------------------+--------------------------------------+

# 作成済みネットワーク一覧

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

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| 7302c07e-c543-4a85-a955-d6cc8a4e4011 | public  | 8fbc394a-e821-47d8-8efc-d5f7c7db0ff8 |
| aa200aa9-ddb2-4d89-aa37-ce3e3a939421 | private | dfb0949d-d775-4c17-9b07-b01ac7d71aac |
+--------------------------------------+---------+--------------------------------------+

# 作成済みプロジェクト一覧

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

+----------------------------------+-----------+
| ID                               | Name      |
+----------------------------------+-----------+
| 756e2b4937c44d3991028e294f92d89a | hiroshima |
| aff8e7e402dc4d9e849bbe0e34fa4538 | service   |
| b19d04cd37254937a4eaebcd0f0f0a43 | admin     |
+----------------------------------+-----------+

# [private] への [access_as_shared] アクセス権を [hiroshima] プロジェクトに付与

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

[root@dlp ~(keystone)]#
prjID=$(openstack project list | grep hiroshima | awk '{ print $2 }')

[root@dlp ~(keystone)]#
openstack network rbac create --target-project $prjID --type network --action access_as_shared $netID

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| action            | access_as_shared                     |
| id                | 44139cce-fd2b-440d-a95c-d847baacae28 |
| object_id         | aa200aa9-ddb2-4d89-aa37-ce3e3a939421 |
| object_type       | network                              |
| project_id        | b19d04cd37254937a4eaebcd0f0f0a43     |
| target_project_id | 756e2b4937c44d3991028e294f92d89a     |
+-------------------+--------------------------------------+
[6] 内部ネットワークへのアクセス権を付与したプロジェクトに所属する任意のユーザーでログインし、 作成した内部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 |
+----+-----------+-------+------+-----------+-------+-----------+
| 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                              |
+--------------------------------------+---------+--------------------------------------+
| 7302c07e-c543-4a85-a955-d6cc8a4e4011 | public  | 8fbc394a-e821-47d8-8efc-d5f7c7db0ff8 |
| aa200aa9-ddb2-4d89-aa37-ce3e3a939421 | private | dfb0949d-d775-4c17-9b07-b01ac7d71aac |
+--------------------------------------+---------+--------------------------------------+

# 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      | 2024-10-10T03:43:40Z                                                      |
| description     | secgroup01                                                                |
| id              | 84b37bf4-30cc-4fd6-99fc-ffafe4aed86c                                      |
| name            | secgroup01                                                                |
| project_id      | 756e2b4937c44d3991028e294f92d89a                                          |
| revision_number | 1                                                                         |
| rules           | created_at='2024-10-10T03:43:40Z', direction='egress', ethertype='IPv6... |
|                 | created_at='2024-10-10T03:43:40Z', direction='egress', ethertype='IPv4... |
| shared          | False                                                                     |
| stateful        | True                                                                      |
| tags            | []                                                                        |
| updated_at      | 2024-10-10T03:43:40Z                                                      |
+-----------------+---------------------------------------------------------------------------+

# 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 | b1:00:bc:fe:b3:09:e8:7d:14:f8:61:d6:9e:0a:28:1a |
| id          | mykey                                           |
| is_deleted  | None                                            |
| name        | mykey                                           |
| type        | ssh                                             |
| user_id     | 19c7530debb54eb0bfe6dc47aae3df32                |
+-------------+-------------------------------------------------+

[cent@dlp ~(keystone)]$
netID=$(openstack network list | grep private | 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   |
+--------------------------------------+------------+--------+-------------------------+----------------+----------+
| 3d753408-6705-4cbf-acd8-2e09d975b973 | CentOS-St9 | ACTIVE | private=192.168.100.103 | CentOS-Stream9 | m1.small |
+--------------------------------------+------------+--------+-------------------------+----------------+----------+
[7] 作成した仮想マシンインスタンスにフローティング IP を割り当てます。
[cent@dlp ~(keystone)]$
openstack floating ip create public

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| created_at          | 2024-10-10T03:47:29Z                 |
| description         |                                      |
| dns_domain          |                                      |
| dns_name            |                                      |
| fixed_ip_address    | None                                 |
| floating_ip_address | 10.0.0.206                           |
| floating_network_id | 7302c07e-c543-4a85-a955-d6cc8a4e4011 |
| id                  | c4fc265e-6a8a-4d21-996e-f3288fd7b94e |
| name                | 10.0.0.206                           |
| port_details        | None                                 |
| port_id             | None                                 |
| project_id          | 756e2b4937c44d3991028e294f92d89a     |
| qos_policy_id       | None                                 |
| revision_number     | 0                                    |
| router_id           | None                                 |
| status              | DOWN                                 |
| subnet_id           | None                                 |
| tags                | []                                   |
| updated_at          | 2024-10-10T03:47:29Z                 |
+---------------------+--------------------------------------+

[cent@dlp ~(keystone)]$
openstack server add floating ip CentOS-St9 10.0.0.206
# 設定確認

[cent@dlp ~(keystone)]$
openstack floating ip show 10.0.0.206

+---------------------+------------------------------------------------------------------------+
| Field               | Value                                                                  |
+---------------------+------------------------------------------------------------------------+
| created_at          | 2024-10-10T03:47:29Z                                                   |
| description         |                                                                        |
| dns_domain          |                                                                        |
| dns_name            |                                                                        |
| fixed_ip_address    | 192.168.100.103                                                        |
| floating_ip_address | 10.0.0.206                                                             |
| floating_network_id | 7302c07e-c543-4a85-a955-d6cc8a4e4011                                   |
| id                  | c4fc265e-6a8a-4d21-996e-f3288fd7b94e                                   |
| name                | 10.0.0.206                                                             |
| port_details        | admin_state_up='True', device_id='3d753408-6705-4cbf-acd8-2e09d975b... |
| port_id             | af9b32f4-ff22-49c9-a24b-5c7638261be4                                   |
| project_id          | 756e2b4937c44d3991028e294f92d89a                                       |
| qos_policy_id       | None                                                                   |
| revision_number     | 2                                                                      |
| router_id           | a566d09f-e159-436d-8942-4c13dee793ed                                   |
| status              | ACTIVE                                                                 |
| subnet_id           | None                                                                   |
| tags                | []                                                                     |
| updated_at          | 2024-10-10T03:47:50Z                                                   |
+---------------------+------------------------------------------------------------------------+

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

+--------------------------------------+------------+--------+-------------------------------------+----------------+----------+
| ID                                   | Name       | Status | Networks                            | Image          | Flavor   |
+--------------------------------------+------------+--------+-------------------------------------+----------------+----------+
| 3d753408-6705-4cbf-acd8-2e09d975b973 | CentOS-St9 | ACTIVE | private=10.0.0.206, 192.168.100.103 | CentOS-Stream9 | m1.small |
+--------------------------------------+------------+--------+-------------------------------------+----------------+----------+
[8] 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              | 2024-10-10T03:48:54Z                 |
| description             |                                      |
| direction               | ingress                              |
| ether_type              | IPv4                                 |
| id                      | 7d41506c-3a01-4d6d-a37f-cd1c00a18d05 |
| 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       | 84b37bf4-30cc-4fd6-99fc-ffafe4aed86c |
| tags                    | []                                   |
| updated_at              | 2024-10-10T03:48:54Z                 |
+-------------------------+--------------------------------------+

# 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              | 2024-10-10T03:49:10Z                 |
| description             |                                      |
| direction               | ingress                              |
| ether_type              | IPv4                                 |
| id                      | 615bec6a-1c85-41f0-84a4-4667cc528e51 |
| 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       | 84b37bf4-30cc-4fd6-99fc-ffafe4aed86c |
| tags                    | []                                   |
| updated_at              | 2024-10-10T03:49:10Z                 |
+-------------------------+--------------------------------------+

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

+--------------------------------------+-------------+-----------+-----------+------------+-----------+-----------------------+----------------------+
| ID                                   | IP Protocol | Ethertype | IP Range  | Port Range | Direction | Remote Security Group | Remote Address Group |
+--------------------------------------+-------------+-----------+-----------+------------+-----------+-----------------------+----------------------+
| 1b218025-3902-4d2b-a3d2-fe8b100b9504 | None        | IPv6      | ::/0      |            | egress    | None                  | None                 |
| 615bec6a-1c85-41f0-84a4-4667cc528e51 | tcp         | IPv4      | 0.0.0.0/0 | 22:22      | ingress   | None                  | None                 |
| 62c80b53-71ea-4886-a0aa-93d80e8ddab3 | None        | IPv4      | 0.0.0.0/0 |            | egress    | None                  | None                 |
| 7d41506c-3a01-4d6d-a37f-cd1c00a18d05 | icmp        | IPv4      | 0.0.0.0/0 |            | ingress   | None                  | None                 |
+--------------------------------------+-------------+-----------+-----------+------------+-----------+-----------------------+----------------------+
[9] 仮想マシンインスタンスに割りあてられたフローティング IP 宛てに SSH 接続することで、インスタンスに SSH ログインできます。
[cent@dlp ~(keystone)]$
openstack server list

+--------------------------------------+------------+--------+-------------------------------------+----------------+----------+
| ID                                   | Name       | Status | Networks                            | Image          | Flavor   |
+--------------------------------------+------------+--------+-------------------------------------+----------------+----------+
| 3d753408-6705-4cbf-acd8-2e09d975b973 | CentOS-St9 | ACTIVE | private=10.0.0.206, 192.168.100.103 | CentOS-Stream9 | m1.small |
+--------------------------------------+------------+--------+-------------------------------------+----------------+----------+

[cent@dlp ~(keystone)]$
ssh centos@10.0.0.206

The authenticity of host '10.0.0.206 (10.0.0.206)' can't be established.
ED25519 key fingerprint is SHA256:NRh1HbSMw3XxTnvhQ2tCWbz5wNq1OuK1kDhovl1GKGQ.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '10.0.0.206' (ED25519) to the list of known hosts.
[centos@centos-st9 ~]$     # ログインできた
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