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OpenStack Queens : Neutron ネットワーク構成(VXLAN)
2018/03/13
 
OpenStack Network Service(Neutron)による仮想ネットワークの構成です。
例として、VXLAN タイプの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  |   |        L2 Agent       |   |        Libvirt        |
     |  Memcached  httpd     |   |        L3 Agent       |   |     Nova Compute      |
     |  Keystone   Glance    |   |     Metadata Agent    |   |        L2 Agent       |
     |  Nova API             |   |                       |   |                       |
     |  Neutron Server       |   |                       |   |                       |
     |  Metadata Agent       |   |                       |   |                       |
     +-----------------------+   +-----------+-----------+   +-----------------------+
                                             |eth1

[1] Control ノードで以下のように設定変更します。
root@dlp ~(keystone)#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# 130行目: tenant_network_types に値を追記

tenant_network_types =
vxlan
# 181行目:追記

[ml2_type_flat]
flat_networks = physnet1
# 235行目:追記

[ml2_type_vxlan]
vni_ranges = 1:1000
root@dlp ~(keystone)#
systemctl restart neutron-server

[2] Network ノードで以下のように設定変更します。
root@network:~#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# 130行目: tenant_network_types に値を追記

tenant_network_types =
vxlan
# 181行目:追記

[ml2_type_flat]
flat_networks = physnet1
# 235行目:追記

[ml2_type_vxlan]
vni_ranges = 1:1000
root@network:~#
vi /etc/neutron/plugins/ml2/linuxbridge_agent.ini
# 118行目:追記

[agent]
prevent_arp_spoofing = True
# 147行目:追記

[linux_bridge]
physical_interface_mappings = physnet1:eth1
# 201行目:追記

[vxlan]
enable_vxlan = True
l2_population = True
root@network:~#
vi /etc/neutron/dhcp_agent.ini
# 63行目:追記

dnsmasq_config_file = /etc/neutron/dnsmasq-neutron.conf
root@network:~#
vi /etc/neutron/dnsmasq-neutron.conf
# 新規作成

dhcp-option-force=26,1450
root@network:~#
for service in l3-agent dhcp-agent metadata-agent linuxbridge-agent; do
systemctl restart neutron-$service
done

[3] Compute ノードで以下のように設定変更します。
root@node01:~#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# 130行目: tenant_network_types に値を追記

tenant_network_types =
vxlan
# 181行目:追記

[ml2_type_flat]
flat_networks = physnet1
# 235行目:追記

[ml2_type_vxlan]
vni_ranges = 1:1000
root@node01:~#
vi /etc/neutron/plugins/ml2/linuxbridge_agent.ini
# 118行目:追記

[agent]
prevent_arp_spoofing = True
# 201行目:追記

[vxlan]
enable_vxlan = True
l2_population = True
root@node01:~#
systemctl restart neutron-linuxbridge-agent

[4] 仮想ルータを作成します。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。
# 仮想ルーター作成

root@dlp ~(keystone)#
openstack router create router01

+-------------------------+--------------------------------------+
| Field                   | Value                                |
+-------------------------+--------------------------------------+
| admin_state_up          | UP                                   |
| availability_zone_hints |                                      |
| availability_zones      |                                      |
| created_at              | 2018-03-15T07:39:44Z                 |
| description             |                                      |
| distributed             | False                                |
| external_gateway_info   | None                                 |
| flavor_id               | None                                 |
| ha                      | False                                |
| id                      | dc18c5f9-9260-45d3-ba02-39aa5becb2a1 |
| name                    | router01                             |
| project_id              | 1ab4e37f25d14d4d8e8f5745c53bc885     |
| revision_number         | 0                                    |
| routes                  |                                      |
| status                  | ACTIVE                               |
| tags                    |                                      |
| updated_at              | 2018-03-15T07:39:44Z                 |
+-------------------------+--------------------------------------+
[5] 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 int_net --provider-network-type vxlan

+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2018-03-15T07:40:16Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | 40e03738-cd4b-49b4-9e64-fabcaac64dd5 |
| ipv4_address_scope        | None                                 |
| ipv6_address_scope        | None                                 |
| is_default                | False                                |
| is_vlan_transparent       | None                                 |
| mtu                       | 1450                                 |
| name                      | int_net                              |
| port_security_enabled     | True                                 |
| project_id                | 1ab4e37f25d14d4d8e8f5745c53bc885     |
| provider:network_type     | vxlan                                |
| provider:physical_network | None                                 |
| provider:segmentation_id  | 60                                   |
| qos_policy_id             | None                                 |
| revision_number           | 2                                    |
| router:external           | Internal                             |
| segments                  | None                                 |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| updated_at                | 2018-03-15T07:40:16Z                 |
+---------------------------+--------------------------------------+

# 内部用ネットワークにサブネット作成

root@dlp ~(keystone)#
openstack subnet create subnet1 --network int_net \
--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        | 2018-03-15T07:40:38Z                 |
| description       |                                      |
| dns_nameservers   | 10.0.0.10                            |
| enable_dhcp       | True                                 |
| gateway_ip        | 192.168.100.1                        |
| host_routes       |                                      |
| id                | 9fdf51fe-31a9-4f89-8e33-6e3c00a37002 |
| ip_version        | 4                                    |
| ipv6_address_mode | None                                 |
| ipv6_ra_mode      | None                                 |
| name              | subnet1                              |
| network_id        | 40e03738-cd4b-49b4-9e64-fabcaac64dd5 |
| project_id        | 1ab4e37f25d14d4d8e8f5745c53bc885     |
| revision_number   | 0                                    |
| segment_id        | None                                 |
| service_types     |                                      |
| subnetpool_id     | None                                 |
| tags              |                                      |
| updated_at        | 2018-03-15T07:40:38Z                 |
+-------------------+--------------------------------------+

# 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 subnet1
[6] 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 ext_net

+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2018-03-15T07:41:32Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | 13a8c6d1-bb29-4aa1-b698-31630852cb87 |
| ipv4_address_scope        | None                                 |
| ipv6_address_scope        | None                                 |
| is_default                | False                                |
| is_vlan_transparent       | None                                 |
| mtu                       | 1500                                 |
| name                      | ext_net                              |
| port_security_enabled     | True                                 |
| project_id                | 1ab4e37f25d14d4d8e8f5745c53bc885     |
| provider:network_type     | flat                                 |
| provider:physical_network | physnet1                             |
| provider:segmentation_id  | None                                 |
| qos_policy_id             | None                                 |
| revision_number           | 5                                    |
| router:external           | External                             |
| segments                  | None                                 |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| updated_at                | 2018-03-15T07:41:32Z                 |
+---------------------------+--------------------------------------+

# 外部用ネットワークにサブネット作成

root@dlp ~(keystone)#
openstack subnet create subnet2 \
--network ext_net --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        | 2018-03-15T07:41:51Z                 |
| description       |                                      |
| dns_nameservers   | 10.0.0.10                            |
| enable_dhcp       | False                                |
| gateway_ip        | 10.0.0.1                             |
| host_routes       |                                      |
| id                | 655fa742-2e84-4539-8d15-c008f1e4331e |
| ip_version        | 4                                    |
| ipv6_address_mode | None                                 |
| ipv6_ra_mode      | None                                 |
| name              | subnet2                              |
| network_id        | 13a8c6d1-bb29-4aa1-b698-31630852cb87 |
| project_id        | 1ab4e37f25d14d4d8e8f5745c53bc885     |
| revision_number   | 0                                    |
| segment_id        | None                                 |
| service_types     |                                      |
| subnetpool_id     | None                                 |
| tags              |                                      |
| updated_at        | 2018-03-15T07:41:51Z                 |
+-------------------+--------------------------------------+

# 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 ext_net

[7] 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                            |
+--------------------------------------+-------------+--------------------------------------+
| e06d3040-80f1-447a-981a-fbfa4cda6dd5 | network     | 13a8c6d1-bb29-4aa1-b698-31630852cb87 |
+--------------------------------------+-------------+--------------------------------------+

# RBAC の詳細 (access_as_external のみ全プロジェクトがアクセス可能)

root@dlp ~(keystone)#
openstack network rbac show e06d3040-80f1-447a-981a-fbfa4cda6dd5

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| action            | access_as_external                   |
| id                | e06d3040-80f1-447a-981a-fbfa4cda6dd5 |
| name              | None                                 |
| object_id         | 13a8c6d1-bb29-4aa1-b698-31630852cb87 |
| object_type       | network                              |
| project_id        | 1ab4e37f25d14d4d8e8f5745c53bc885     |
| target_project_id | *                                    |
+-------------------+--------------------------------------+

# 作成済みネットワーク一覧

root@dlp ~(keystone)#
openstack network list

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| 13a8c6d1-bb29-4aa1-b698-31630852cb87 | ext_net | 655fa742-2e84-4539-8d15-c008f1e4331e |
| 40e03738-cd4b-49b4-9e64-fabcaac64dd5 | int_net | 9fdf51fe-31a9-4f89-8e33-6e3c00a37002 |
+--------------------------------------+---------+--------------------------------------+

# 作成済みプロジェクト一覧

root@dlp ~(keystone)#
openstack project list

+----------------------------------+-----------+
| ID                               | Name      |
+----------------------------------+-----------+
| 142ba5a5d91c4148a4caa9227e05b504 | hiroshima |
| 1ab4e37f25d14d4d8e8f5745c53bc885 | admin     |
| ffc35f92a94a4df8b512f342421ed01e | service   |
+----------------------------------+-----------+

# [int_net] 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 int_net | 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                | 8a6bde7c-3b1d-49c5-9cf5-5a05d94eb856 |
| name              | None                                 |
| object_id         | 40e03738-cd4b-49b4-9e64-fabcaac64dd5 |
| object_type       | network                              |
| project_id        | 1ab4e37f25d14d4d8e8f5745c53bc885     |
| target_project_id | 142ba5a5d91c4148a4caa9227e05b504     |
+-------------------+--------------------------------------+
[8] 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

ubuntu@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

ubuntu@dlp ~(keystone)$
openstack image list

+--------------------------------------+------------+--------+
| ID                                   | Name       | Status |
+--------------------------------------+------------+--------+
| 217a694d-e526-4921-a018-6b1e6874ef44 | Ubuntu1604 | active |
+--------------------------------------+------------+--------+

# 利用可能なネットワーク確認

ubuntu@dlp ~(keystone)$
openstack network list

+--------------------------------------+---------+--------------------------------------+
| ID                                   | Name    | Subnets                              |
+--------------------------------------+---------+--------------------------------------+
| 13a8c6d1-bb29-4aa1-b698-31630852cb87 | ext_net | 655fa742-2e84-4539-8d15-c008f1e4331e |
| 40e03738-cd4b-49b4-9e64-fabcaac64dd5 | int_net | 9fdf51fe-31a9-4f89-8e33-6e3c00a37002 |
+--------------------------------------+---------+--------------------------------------+

# インスタンス用のセキュリティグループを作成

ubuntu@dlp ~(keystone)$
openstack security group create secgroup01

+-----------------+-----------------------------------------------------------------------------------+
| Field           | Value                                                                             |
+-----------------+-----------------------------------------------------------------------------------+
| created_at      | 2018-03-15T06:55:02Z                                                              |
| description     | secgroup01                                                                        |
| id              | 395dced0-e033-46d0-9ddd-ef78d196c2b1                                              |
| name            | secgroup01                                                                        |
| project_id      | 142ba5a5d91c4148a4caa9227e05b504                                                  |
| revision_number | 2                                                                                 |
| rules           | created_at='2018-03-15T06:55:03Z', direction='egress', ethertype='IPv4', id='...' |
|                 | created_at='2018-03-15T06:55:03Z', direction='egress', ethertype='IPv6', id='...' |
| updated_at      | 2018-03-15T06:55:03Z                                                              |
+-----------------+-----------------------------------------------------------------------------------+

# インスタンス接続用の SSH キーペア作成

ubuntu@dlp ~(keystone)$
ssh-keygen -q -N ""

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

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

+-------------+-------------------------------------------------+
| Field       | Value                                           |
+-------------+-------------------------------------------------+
| fingerprint | ec:94:28:27:00:1e:90:09:24:b5:e5:23:79:26:ed:82 |
| name        | mykey                                           |
| user_id     | b7b1b4b96b714e458690dd893fbbe5f5                |
+-------------+-------------------------------------------------+

ubuntu@dlp ~(keystone)$
netID=$(openstack network list | grep int_net | awk '{ print $2 }')

ubuntu@dlp ~(keystone)$
openstack server create --flavor m1.small --image Ubuntu1604 --security-group secgroup01 --nic net-id=$netID --key-name mykey Ubuntu_1604
ubuntu@dlp ~(keystone)$
openstack server list

+--------------------------------------+-------------+--------+-----------------------+------------+----------+
| ID                                   | Name        | Status | Networks              | Image      | Flavor   |
+--------------------------------------+-------------+--------+-----------------------+------------+----------+
| 392e0512-ee22-40f0-87d9-18482434f604 | Ubuntu_1604 | ACTIVE | int_net=192.168.100.7 | Ubuntu1604 | m1.small |
+--------------------------------------+-------------+--------+-----------------------+------------+----------+
[9] 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。
ubuntu@dlp ~(keystone)$
openstack floating ip create ext_net

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| created_at          | 2018-03-15T07:47:21Z                 |
| description         |                                      |
| fixed_ip_address    | None                                 |
| floating_ip_address | 10.0.0.208                           |
| floating_network_id | 13a8c6d1-bb29-4aa1-b698-31630852cb87 |
| id                  | 35b9d89d-efe2-432f-865b-4d2c71d806b4 |
| name                | 10.0.0.208                           |
| port_id             | None                                 |
| project_id          | 142ba5a5d91c4148a4caa9227e05b504     |
| qos_policy_id       | None                                 |
| revision_number     | 0                                    |
| router_id           | None                                 |
| status              | DOWN                                 |
| subnet_id           | None                                 |
| updated_at          | 2018-03-15T07:47:21Z                 |
+---------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack server add floating ip Ubuntu_1604 10.0.0.208

# 設定確認

ubuntu@dlp ~(keystone)$
openstack floating ip show 10.0.0.208

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| created_at          | 2018-03-15T07:47:21Z                 |
| description         |                                      |
| fixed_ip_address    | 192.168.100.7                        |
| floating_ip_address | 10.0.0.208                           |
| floating_network_id | 13a8c6d1-bb29-4aa1-b698-31630852cb87 |
| id                  | 35b9d89d-efe2-432f-865b-4d2c71d806b4 |
| name                | 10.0.0.208                           |
| port_id             | 6b4543b0-08d3-46f0-9bb9-88f3d83e8426 |
| project_id          | 142ba5a5d91c4148a4caa9227e05b504     |
| qos_policy_id       | None                                 |
| revision_number     | 2                                    |
| router_id           | dc18c5f9-9260-45d3-ba02-39aa5becb2a1 |
| status              | ACTIVE                               |
| subnet_id           | None                                 |
| updated_at          | 2018-03-15T07:47:59Z                 |
+---------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack server list

+-----------+-------------+--------+-----------------------------------+------------+----------+
| ID        | Name        | Status | Networks                          | Image      | Flavor   |
+-----------+-------------+--------+-----------------------------------+------------+----------+
| 392e0512- | Ubuntu_1604 | ACTIVE | int_net=192.168.100.7, 10.0.0.208 | Ubuntu1604 | m1.small |
+-----------+-------------+--------+-----------------------------------+------------+----------+
[10] 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

ubuntu@dlp ~(keystone)$
openstack security group rule create --protocol icmp --ingress default

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| created_at        | 2018-03-15T07:10:38Z                 |
| description       |                                      |
| direction         | ingress                              |
| ether_type        | IPv4                                 |
| id                | ab347ca5-733c-4b8b-8517-c7b877e88c05 |
| name              | None                                 |
| port_range_max    | None                                 |
| port_range_min    | None                                 |
| project_id        | 142ba5a5d91c4148a4caa9227e05b504     |
| protocol          | icmp                                 |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 0                                    |
| security_group_id | 933b3c77-0b90-4914-8c96-2d33c7e986f5 |
| updated_at        | 2018-03-15T07:10:38Z                 |
+-------------------+--------------------------------------+

# SSH 許可

ubuntu@dlp ~(keystone)$
openstack security group rule create --protocol tcp --dst-port 22:22 default

+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| created_at        | 2018-03-15T07:10:44Z                 |
| description       |                                      |
| direction         | ingress                              |
| ether_type        | IPv4                                 |
| id                | bf75faa3-0d56-46e1-8697-01c738e3cf11 |
| name              | None                                 |
| port_range_max    | 22                                   |
| port_range_min    | 22                                   |
| project_id        | 142ba5a5d91c4148a4caa9227e05b504     |
| protocol          | tcp                                  |
| remote_group_id   | None                                 |
| remote_ip_prefix  | 0.0.0.0/0                            |
| revision_number   | 0                                    |
| security_group_id | 933b3c77-0b90-4914-8c96-2d33c7e986f5 |
| updated_at        | 2018-03-15T07:10:44Z                 |
+-------------------+--------------------------------------+

ubuntu@dlp ~(keystone)$
openstack security group rule list

+--------------+-------------+-----------+------------+-----------------------------+-------------------+
| ID           | IP Protocol | IP Range  | Port Range | Remote Security Group       | Security Group    |
+--------------+-------------+-----------+------------+-----------------------------+-------------------+
| 2374f9c6-... | None        | None      |            | None                        | 395dced0-e033-... |
| 3e90d0fb-... | None        | None      |            | 933b3c77-0b90-4914-8c96-... | 933b3c77-0b90-... |
| 520d7b7d-... | None        | None      |            | None                        | 933b3c77-0b90-... |
| 72c7ef17-... | None        | None      |            | None                        | 933b3c77-0b90-... |
| 9225abd6-... | None        | None      |            | 933b3c77-0b90-4914-8c96-... | 933b3c77-0b90-... |
| ab347ca5-... | icmp        | 0.0.0.0/0 |            | None                        | 933b3c77-0b90-... |
| bf75faa3-... | tcp         | 0.0.0.0/0 | 22:22      | None                        | 933b3c77-0b90-... |
| fc204462-... | None        | None      |            | None                        | 395dced0-e033-... |
+--------------+-------------+-----------+------------+-----------------------------+-------------------+
[11] 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。
ubuntu@dlp ~(keystone)$
openstack server list

+-----------+-------------+--------+-----------------------------------+------------+----------+
| ID        | Name        | Status | Networks                          | Image      | Flavor   |
+-----------+-------------+--------+-----------------------------------+------------+----------+
| 392e0512- | Ubuntu_1604 | ACTIVE | int_net=192.168.100.7, 10.0.0.208 | Ubuntu1604 | m1.small |
+-----------+-------------+--------+-----------------------------------+------------+----------+

ubuntu@dlp ~(keystone)$
ssh ubuntu@10.0.0.208

Warning: Identity file mykey not accessible: No such file or directory.
The authenticity of host '10.0.0.208 (10.0.0.208)' can't be established.
ECDSA key fingerprint is SHA256:z2vAoYo/XEYaVWPijjqxx/DXaHQu44XT9ro/9wDaJZg.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.0.0.208' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 16.04.4 LTS (GNU/Linux 4.4.0-116-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

0 packages can be updated.
0 updates are security updates.

Last login: Thu Mar 15 11:19:07 2018
ubuntu@ubuntu-1604:~$    
# ログインできた
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