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OpenStack Liberty : Neutron ネットワーク構成(GRE)
2015/11/15
 
OpenStack Network Service(Neutron)による仮想ネットワークの構成です。
例として、GRE トンネルタイプのネットワークを構成します。
Control ノードNetwork ノードCompute ノードはそれぞれ事前に基本設定をしておいてください。
想定する構成は 以下のように VLAN タイプのネットワーク構成例と同様の構成で設定します。
ここでは 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ことを前提とします。

                                        |
  +-------------+                  +----+----+
  | Name Server |                  | Gateway |
  +------+------+                  +----+----+
         |10.0.0.10                     |10.0.0.1
         |                              |
         +------------+-----------------+------------------------+
         |            |                 |                        |
         |            |                 |              10.0.0.200-10.0.0.254
     eth0|10.0.0.30   |        10.0.0.50| eth0          +--------+-------+
+--------+---------+  |     +-----------+----------+    | Virtual Router |
| [ Control Node ] |  |     |   [ Network Node ]   |    +--------+-------+
|     Keystone     |  |     |       DHCP Agent     |       192.168.100.1
|      Glance      |  |     |       L3 Agent       |eth1         |            192.168.100.0/24
|     Nova API     |  |     |       L2 Agent       |             |           +-----------------+
|  Neutron Server  |  |     |    Metadata Agent    |             |       +---| Virtual Machine |
+------------------+  |     +----------------------+             |       |   +-----------------+
                      |                                          |       |   +-----------------+
                      |     +----------------------+             +-------+---| Virtual Machine |
                      | eth0|   [ Compute Node ]   |                     |   +-----------------+
                      +-----|     Nova Compute     |                     |   +-----------------+
                   10.0.0.51|       L2 Agent       |                     |---| Virtual Machine |
                            +----------------------+                     |   +-----------------+
                                                                         |   +-----------------+
                                                                         +---| Virtual Machine |
                                                                             +-----------------+
[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
# 8行目あたり: tenant_network_types に値を追記

tenant_network_types =
gre
# 83行目あたりに追記

[ml2_type_gre]
tunnel_id_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。
# ブリッジ追加

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

# 追加したブリッジのポートにeth1を追加

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

[root@network ~]#
vi /etc/neutron/l3_agent.ini
# 69行目:追記

external_network_bridge =
br-ext
[root@network ~]#
vi /etc/neutron/plugins/ml2/ml2_conf.ini
# 8行目あたり: tenant_network_types に値を追記

tenant_network_types =
gre
# 83行目あたりに追記

[ml2_type_gre]
tunnel_id_ranges = 1:1000
[root@network ~]#
vi /etc/neutron/plugins/ml2/openvswitch_agent.ini
# 2行目:追記 ( local_ip はこのノードのローカルIPを指定)

[ovs]
local_ip = 10.0.0.50
enable_tunneling = True
bridge_mappings = external:br-ext
# 89行目あたりに追記

[agent]
tunnel_types = gre
[root@network ~]#
systemctl restart neutron-l3-agent neutron-openvswitch-agent

[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
# 8行目あたり: tenant_network_types に値を追記

tenant_network_types =
gre
# 83行目あたりに追記

[ml2_type_gre]
tunnel_id_ranges = 1:1000
[root@node01 ~]#
vi /etc/neutron/plugins/ml2/openvswitch_agent.ini
# 2行目:追記 ( local_ip はこのノードのローカルIPを指定)

[ovs]
local_ip = 10.0.0.51
enable_tunneling = True
# 88行目あたりに追記

[agent]
tunnel_types = gre
[root@node01 ~]#
systemctl restart neutron-openvswitch-agent

[4] 仮想ルータを作成しておきます。作業場所はどこでもよいですが、ここでは Control ノード上で作業します。
# 仮想ルーター作成

[root@dlp ~(keystone)]#
neutron router-create router01

Created a new router:
+-----------------------+--------------------------------------+
| Field                 | Value                                |
+-----------------------+--------------------------------------+
| admin_state_up        | True                                 |
| distributed           | False                                |
| external_gateway_info |                                      |
| ha                    | False                                |
| id                    | 8c37760a-4b8e-4c9e-8d53-3158e44e1c19 |
| name                  | router01                             |
| routes                |                                      |
| status                | ACTIVE                               |
| tenant_id             | d625e02b3d394afbad250def2f88fefa     |
+-----------------------+--------------------------------------+

[root@dlp ~(keystone)]#
Router_ID=`neutron router-list | grep router01 | awk '{ print $2 }'`

[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)]#
neutron net-create int_net

Created a new network:
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | True                                 |
| id                        | 0940cbc6-aa15-483a-ac36-4df923c750a0 |
| mtu                       | 0                                    |
| name                      | int_net                              |
| provider:network_type     | gre                                  |
| provider:physical_network |                                      |
| provider:segmentation_id  | 15                                   |
| router:external           | False                                |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tenant_id                 | d625e02b3d394afbad250def2f88fefa     |
+---------------------------+--------------------------------------+

# 内部用ネットワークにサブネット作成

[root@dlp ~(keystone)]#
neutron subnet-create \
--gateway 192.168.100.1 --dns-nameserver 10.0.0.1 int_net 192.168.100.0/24

Created a new subnet:
+-------------------+------------------------------------------------------+
| Field             | Value                                                |
+-------------------+------------------------------------------------------+
| allocation_pools  | {"start": "192.168.100.2", "end": "192.168.100.254"} |
| cidr              | 192.168.100.0/24                                     |
| dns_nameservers   | 10.0.0.1                                             |
| enable_dhcp       | True                                                 |
| gateway_ip        | 192.168.100.1                                        |
| host_routes       |                                                      |
| id                | 772fcfea-1660-45ef-8241-2905bd107d40                 |
| ip_version        | 4                                                    |
| ipv6_address_mode |                                                      |
| ipv6_ra_mode      |                                                      |
| name              |                                                      |
| network_id        | 0940cbc6-aa15-483a-ac36-4df923c750a0                 |
| subnetpool_id     |                                                      |
| tenant_id         | d625e02b3d394afbad250def2f88fefa                     |
+-------------------+------------------------------------------------------+

[root@dlp ~(keystone)]#
Int_Subnet_ID=`neutron net-list | grep int_net | awk '{ print $6 }'`
# 仮想ルーターに内部ネットワークを設定

[root@dlp ~(keystone)]#
neutron router-interface-add $Router_ID $Int_Subnet_ID

Added interface c28ca272-18a1-4af5-9cf2-de321df8b724 to router 8c37760a-4b8e-4c9e-8d53-3158e44e1c19.
[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)]#
neutron net-create ext_net --router:external

Created a new network:
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | True                                 |
| id                        | 5ce8e2d6-06a5-48e2-8465-2f642ad85e0f |
| mtu                       | 0                                    |
| name                      | ext_net                              |
| provider:network_type     | gre                                  |
| provider:physical_network |                                      |
| provider:segmentation_id  | 71                                   |
| router:external           | True                                 |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tenant_id                 | d625e02b3d394afbad250def2f88fefa     |
+---------------------------+--------------------------------------+

# 外部用ネットワークにサブネット作成

[root@dlp ~(keystone)]#
neutron subnet-create ext_net \
--allocation-pool start=10.0.0.200,end=10.0.0.254 \
--gateway 10.0.0.1 --dns-nameserver 10.0.0.1 10.0.0.0/24 --disable-dhcp

Created a new subnet:
+-------------------+----------------------------------------------+
| Field             | Value                                        |
+-------------------+----------------------------------------------+
| allocation_pools  | {"start": "10.0.0.200", "end": "10.0.0.254"} |
| cidr              | 10.0.0.0/24                                  |
| dns_nameservers   | 10.0.0.1                                     |
| enable_dhcp       | False                                        |
| gateway_ip        | 10.0.0.1                                     |
| host_routes       |                                              |
| id                | 9c42866c-1157-45dd-afc0-73454388533c         |
| ip_version        | 4                                            |
| ipv6_address_mode |                                              |
| ipv6_ra_mode      |                                              |
| name              |                                              |
| network_id        | 5ce8e2d6-06a5-48e2-8465-2f642ad85e0f         |
| subnetpool_id     |                                              |
| tenant_id         | d625e02b3d394afbad250def2f88fefa             |
+-------------------+----------------------------------------------+

[root@dlp ~(keystone)]#
Ext_Net_ID=`neutron net-list | grep ext_net | awk '{ print $2 }'`

# 仮想ルーターにゲートウェイを設定

[root@dlp ~(keystone)]#
neutron router-gateway-set $Router_ID $Ext_Net_ID

Set gateway for router 8c37760a-4b8e-4c9e-8d53-3158e44e1c19
[7] 内部ネットワークを関連付けた仮想マシンインスタンスを作成して起動します。
[root@dlp ~(keystone)]#
Int_Net_ID=`neutron net-list | grep int_net | awk '{ print $2 }'`

[root@dlp ~(keystone)]#
nova image-list

+--------------------------------------+---------+--------+--------+
| ID                                   | Name    | Status | Server |
+--------------------------------------+---------+--------+--------+
| 34beed31-2971-43f0-9c5a-d39d3df1d501 | CentOS7 | ACTIVE |        |
+--------------------------------------+---------+--------+--------+

[root@dlp ~(keystone)]#
nova boot --flavor 2 --image CentOS7 --security_group default --nic net-id=$Int_Net_ID CentOS_7

[root@dlp ~(keystone)]#
nova list

+-----------+----------+--------+------------+-------------+-----------------------+
| ID        | Name     | Status | Task State | Power State | Networks              |
+-----------+----------+--------+------------+-------------+-----------------------+
| 028bf570- | CentOS_7 | ACTIVE | -          | Running     | int_net=192.168.100.3 |
+-----------+----------+--------+------------+-------------+-----------------------+
[8] 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。
[root@dlp ~(keystone)]#
neutron floatingip-create ext_net

Created a new floatingip:
+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| fixed_ip_address    |                                      |
| floating_ip_address | 10.0.0.201                           |
| floating_network_id | 5ce8e2d6-06a5-48e2-8465-2f642ad85e0f |
| id                  | de3f08e1-05a9-4571-9154-20a37f192f2e |
| port_id             |                                      |
| router_id           |                                      |
| status              | DOWN                                 |
| tenant_id           | d625e02b3d394afbad250def2f88fefa     |
+---------------------+--------------------------------------+

[root@dlp ~(keystone)]#
Device_ID=`nova list | grep CentOS_7 | awk '{ print $2 }'`

[root@dlp ~(keystone)]#
Port_ID=`neutron port-list -- --device_id $Device_ID | grep 192.168.100.3 | awk '{ print $2 }'`

[root@dlp ~(keystone)]#
Floating_ID=`neutron floatingip-list | grep 10.0.0.201 | awk '{ print $2 }'`

[root@dlp ~(keystone)]#
neutron floatingip-associate $Floating_ID $Port_ID

Associated floating IP de3f08e1-05a9-4571-9154-20a37f192f2e
# 設定確認

[root@dlp ~(keystone)]#
neutron floatingip-show $Floating_ID

+---------------------+--------------------------------------+
| Field               | Value                                |
+---------------------+--------------------------------------+
| fixed_ip_address    | 192.168.100.3                        |
| floating_ip_address | 10.0.0.201                           |
| floating_network_id | 5ce8e2d6-06a5-48e2-8465-2f642ad85e0f |
| id                  | de3f08e1-05a9-4571-9154-20a37f192f2e |
| port_id             | 01d9c16e-983f-4148-9990-3bec994519cd |
| router_id           | 8c37760a-4b8e-4c9e-8d53-3158e44e1c19 |
| status              | ACTIVE                               |
| tenant_id           | d625e02b3d394afbad250def2f88fefa     |
+---------------------+--------------------------------------+
[9] 起動した仮想マシンインスタンスにSSHで接続できるように、デフォルトセキュリティグループにポート許可の設定をしておきます。
# ICMP 許可

[root@dlp ~(keystone)]#
neutron security-group-rule-create --direction ingress --protocol icmp default

Created a new security_group_rule:
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| direction         | ingress                              |
| ethertype         | IPv4                                 |
| id                | 03d76de0-7d74-45b1-b19a-174a4c6a04a2 |
| port_range_max    |                                      |
| port_range_min    |                                      |
| protocol          | icmp                                 |
| remote_group_id   |                                      |
| remote_ip_prefix  |                                      |
| security_group_id | 26defc29-1ab4-48ce-a842-f79dd30f2bd5 |
| tenant_id         | d625e02b3d394afbad250def2f88fefa     |
+-------------------+--------------------------------------+

# SSH 許可

[root@dlp ~(keystone)]#
neutron security-group-rule-create --direction ingress --protocol tcp --port_range_min 22 --port_range_max 22 default

Created a new security_group_rule:
+-------------------+--------------------------------------+
| Field             | Value                                |
+-------------------+--------------------------------------+
| direction         | ingress                              |
| ethertype         | IPv4                                 |
| id                | ab2df1cf-c052-4ddc-9a06-2a0119ad74ec |
| port_range_max    | 22                                   |
| port_range_min    | 22                                   |
| protocol          | tcp                                  |
| remote_group_id   |                                      |
| remote_ip_prefix  |                                      |
| security_group_id | 26defc29-1ab4-48ce-a842-f79dd30f2bd5 |
| tenant_id         | d625e02b3d394afbad250def2f88fefa     |
+-------------------+--------------------------------------+

[root@dlp ~(keystone)]#
neutron security-group-rule-list

+----------------+----------------+-----------+-----------+---------------+-----------------+
| id             | security_group | direction | ethertype | protocol/port | remote          |
+----------------+----------------+-----------+-----------+---------------+-----------------+
| 03d76de0-7d74- | default        | ingress   | IPv4      | icmp          | any             |
| 66bf77aa-1594- | default        | egress    | IPv6      | any           | any             |
| 8d508297-6157- | default        | ingress   | IPv6      | any           | default (group) |
| ab2df1cf-c052- | default        | ingress   | IPv4      | 22/tcp        | any             |
| c5c0c9ef-0949- | default        | ingress   | IPv4      | any           | default (group) |
| d4145098-f6d2- | default        | egress    | IPv4      | any           | any             |
+----------------+----------------+-----------+-----------+---------------+-----------------+
[10] 仮想マシンインスタンスに割りあてたフローティングIPあてに SSH 接続することで、インスタンスにログインできます。
[root@dlp ~(keystone)]#
ssh 10.0.0.201

The authenticity of host '10.0.0.201 (10.0.0.201)' can't be established.
ECDSA key fingerprint is 03:3d:a6:2c:21:0d:03:cc:de:29:d1:c0:3b:4d:4c:e7.
Are you sure you want to continue connecting (yes/no)?
yes

Warning: Permanently added '10.0.0.201' (ECDSA) to the list of known hosts.
root@10.0.0.201's password:
Last login: Sat Nov 14 21:10:58 2015
[root@host-192-168-100-3 ~]#    
# ログインできた
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