taikun.cloud

Taikun Logo

Taikun OCP Guide

Table of Contents

Share networks

Share networks are essential to allow end users a path to hard
multi-tenancy. When backed by isolated networks, the Shared File Systems
service can guarantee hard network path isolation for the users’ shares.
Users can be allowed to designate their project networks as share
networks. When a share network is provided during share creation, the
share driver sets up a virtual share server (NAS server) on the share
network and exports shares using this NAS server. The share server
itself is abstracted away from the user. You must ensure that the
storage system can connect the share servers it provisions to the
networks users can use as their share networks.

Note

Not all shared file systems storage backends support share networks.
Share networks can only be used when using a share type that has the
specification driver_handles_share_servers=True. To see
what storage back ends support this specification, refer to the share_back_ends_feature_support_mapping.

How to create share network

To list networks in a project, run:

$ openstack network list
+--------------+---------+--------------------+
| ID           | Name    | Subnets            |
+--------------+---------+--------------------+
| bee7411d-... | public  | 884a6564-0f11-...  |
|              |         | e6da81fa-5d5f-...  |
| 5ed5a854-... | private | 74dcfb5a-b4d7-...  |
|              |         | cc297be2-5213-...  |
+--------------+---------+--------------------+

A share network stores network information that share servers can use
where shares are hosted. You can associate a share with a single share
network. You must always specify a share network when creating a share
with a share type that requests hard multi-tenancy, i.e., has extra-spec
‘driver_handles_share_servers=True’.

For more information about supported plug-ins for share networks, see
shared_file_systems_network_plugins.

A share network has these attributes:

  • The IP block in Classless Inter-Domain Routing (CIDR) notation from
    which to allocate the network.
  • The IP version of the network.
  • The network type, which is vlan,
    vxlan, gre, or flat.

If the network uses segmentation, a segmentation identifier. For
example, VLAN, VXLAN, and GRE networks use segmentation.

To create a share network with private network and subnetwork,
run:

$ manila share-network-create --neutron-net-id 5ed5a854-21dc-4ed3-870a-117b7064eb21 \
--neutron-subnet-id 74dcfb5a-b4d7-4855-86f5-a669729428dc --name my_share_net \
--description "My first share network" --availability-zone manila-zone-0
+-------------------+--------------------------------------+
| Property          | Value                                |
+-------------------+--------------------------------------+
| name              | my_share_net                         |
| segmentation_id   | None                                 |
| created_at        | 2015-09-24T12:06:32.602174           |
| neutron_subnet_id | 74dcfb5a-b4d7-4855-86f5-a669729428dc |
| updated_at        | None                                 |
| network_type      | None                                 |
| neutron_net_id    | 5ed5a854-21dc-4ed3-870a-117b7064eb21 |
| ip_version        | None                                 |
| cidr              | None                                 |
| project_id        | 20787a7ba11946adad976463b57d8a2f     |
| id                | 5c3cbabb-f4da-465f-bc7f-fadbe047b85a |
| description       | My first share network               |
+-------------------+--------------------------------------+

The segmentation_id, cidr,
ip_version, and network_type share network
attributes are automatically set to the values determined by the network
provider.

Note

You are able to specify the parameter availability_zone
only with API versions >= 2.51. From the version 2.51, a share
network is able to span multiple subnets in different availability
zones. The network parameters neutron_net_id,
neutron_subnet_id, segmentation_id,
cidr, ip_version, network_type,
gateway and mtu were moved to the share
network subnet and no longer pertain to the share network. If you do not
specify an availability zone during the share network creation, the
created subnet will be considered default by the Shared File Systems
Service. A default subnet is expected to be reachable from all
availability zones in the cloud.

Note

Since API version 2.63, the share network will have two additional
fields: status and
security_service_update_support. The former indicates the
current status of a share network, and the latter informs if all the
share network’s resources can hold updating or adding security services
after they are already deployed.

To check the network list, run:

$ manila share-network-list
+--------------------------------------+--------------+
| id                                   | name         |
+--------------------------------------+--------------+
| 5c3cbabb-f4da-465f-bc7f-fadbe047b85a | my_share_net |
+--------------------------------------+--------------+

If you configured the generic driver with
driver_handles_share_servers = True (with the share
servers) and already had previous operations in the Shared File Systems
service, you can see manila_service_network in the neutron
list of networks. This network was created by the generic driver for
internal use.

$ openstack network list
+--------------+------------------------+--------------------+
| ID           | Name                   | Subnets            |
+--------------+------------------------+--------------------+
| 3b5a629a-e...| manila_service_network | 4f366100-50...     |
| bee7411d-... | public                 | 884a6564-0f11-...  |
|              |                        | e6da81fa-5d5f-...  |
| 5ed5a854-... | private                | 74dcfb5a-b4d7-...  |
|              |                        | cc297be2-5213-...  |
+--------------+------------------------+--------------------+

You also can see detailed information about the share network
including network_type, and segmentation_id
fields:

$ openstack network show manila_service_network
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        | nova                                 |
| created_at                | 2016-12-13T09:31:30Z                 |
| description               |                                      |
| id                        | 3b5a629a-e7a1-46a3-afb2-ab666fb884bc |
| ipv4_address_scope        | None                                 |
| ipv6_address_scope        | None                                 |
| mtu                       | 1450                                 |
| name                      | manila_service_network               |
| port_security_enabled     | True                                 |
| project_id                | f6ac448a469b45e888050cf837b6e628     |
| provider:network_type     | vxlan                                |
| provider:physical_network | None                                 |
| provider:segmentation_id  | 73                                   |
| revision_number           | 7                                    |
| router:external           | Internal                             |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   | 682e3329-60b0-440f-8749-83ef53dd8544 |
| tags                      | []                                   |
| updated_at                | 2016-12-13T09:31:36Z                 |
+---------------------------+--------------------------------------+

You also can add and remove the security services from the share
network. For more detail, see shared_file_systems_security_services.

How
to reset the state of a share network (Since API version 2.63)

To reset the state of a given share network, run:

$ manila share-network-reset-state manila_service_network --state active

Share network
subnets (Since API version 2.51)

Share network subnet is an entity that stores network data from the
OpenStack Networking service. A share network can span multiple share
network subnets in different availability zones.

How to create share network
subnet

When you create a share network, a primary share network subnet is
automatically created. The share network subnet stores network
information that share servers can use where shares are hosted. If a
share network subnet is not assigned to a specific availability zone, it
is considered to be available across all availability zones. Such a
subnet is referred to as default subnet. A share network
can have only one default subnet. However, having a default subnet is
not necessary. A share can be associated with only one share network. To
list share networks in a project, run:

$ manila share-network-list
+--------------------------------------+-----------------------+
| id                                   | name                  |
+--------------------------------------+-----------------------+
| 483a9787-5116-48b2-bd89-473022fad060 | sharenetwork1         |
| bcb9c650-a501-410d-a418-97f28b8ab61a | sharenetwork2         |
+--------------------------------------+-----------------------+

You can attach any number of share network subnets into a share
network. However, only one share network subnet is allowed per
availability zone in a given share network. If you try to create another
subnet in a share network that already contains a subnet in a specific
availability zone, the operation will be denied.

To create a share network subnet in a specific share network,
run:

$ manila share-network-subnet-create sharenetwork1 \
     --availability-zone manila-zone-0 \
     --neutron-net-id 5ed5a854-21dc-4ed3-870a-117b7064eb21 \
     --neutron-subnet-id 74dcfb5a-b4d7-4855-86f5-a669729428dc
+--------------------+--------------------------------------+
| Property           | Value                                |
+--------------------+--------------------------------------+
| id                 | 20f3cd2c-0faa-4b4b-a00a-4f188eb1cf38 |
| availability_zone  | manila-zone-0                        |
| share_network_id   | 483a9787-5116-48b2-bd89-473022fad060 |
| share_network_name | sharenetwork1                        |
| created_at         | 2019-12-03T00:37:30.000000           |
| segmentation_id    | None                                 |
| neutron_subnet_id  | 74dcfb5a-b4d7-4855-86f5-a669729428dc |
| updated_at         | None                                 |
| neutron_net_id     | 5ed5a854-21dc-4ed3-870a-117b7064eb21 |
| ip_version         | None                                 |
| cidr               | None                                 |
| network_type       | None                                 |
| mtu                | None                                 |
| gateway            | None                                 |
+--------------------+--------------------------------------+

To list all the share network subnets of a given share network, you
need to show the share network, and then all subnets will be displayed,
as shown below:

$ manila share-network-show sharenetwork1
+-----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Property              | Value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
+-----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| id                    | 483a9787-5116-48b2-bd89-473022fad060                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| name                  | sharenetwork1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| project_id            | 58ff89e14f9245d7843b8cf290525b5b                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| created_at            | 2019-12-03T00:16:39.000000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| updated_at            | 2019-12-03T00:31:58.000000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| description           | None                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| share_network_subnets | [{'id': '20f3cd2c-0faa-4b4b-a00a-4f188eb1cf38', 'availability_zone': 'manila-zone-0', 'created_at': '2019-12-03T00:37:30.000000', 'updated_at': None, 'segmentation_id': None, 'neutron_net_id': '5ed5a854-21dc-4ed3-870a-117b7064eb21', 'neutron_subnet_id': '74dcfb5a-b4d7-4855-86f5-a669729428dc', 'ip_version': None, 'cidr': None, 'network_type': None, 'mtu': None, 'gateway': None}, {'id': '8b532c15-3ac7-4ea1-b1bc-732614a82313', 'availability_zone': None, 'created_at': '2019-12-03T00:16:39.000000', 'updated_at': None, 'segmentation_id': None, 'neutron_net_id': None, 'neutron_subnet_id': None, 'ip_version': None, 'cidr': None, 'network_type': None, 'mtu': None, 'gateway': None}] |
+-----------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

To show a specific share network subnet, run:

$ manila share-network-subnet-show sharenetwork1 20f3cd2c-0faa-4b4b-a00a-4f188eb1cf38
+--------------------+--------------------------------------+
| Property           | Value                                |
+--------------------+--------------------------------------+
| id                 | 20f3cd2c-0faa-4b4b-a00a-4f188eb1cf38 |
| availability_zone  | manila-zone-0                        |
| share_network_id   | 483a9787-5116-48b2-bd89-473022fad060 |
| share_network_name | sharenetwork1                        |
| created_at         | 2019-12-03T00:37:30.000000           |
| segmentation_id    | None                                 |
| neutron_subnet_id  | 74dcfb5a-b4d7-4855-86f5-a669729428dc |
| updated_at         | None                                 |
| neutron_net_id     | 5ed5a854-21dc-4ed3-870a-117b7064eb21 |
| ip_version         | None                                 |
| cidr               | None                                 |
| network_type       | None                                 |
| mtu                | None                                 |
| gateway            | None                                 |
+--------------------+--------------------------------------+

To delete a share network subnet, run:

$ manila share-network-subnet-delete sharenetwork1 20f3cd2c-0faa-4b4b-a00a-4f188eb1cf38

If you want to remove a share network subnet, make sure that no other
resource is using the subnet, otherwise the Shared File Systems Service
will deny the operation.

taikun-logo-icon

Explore Taikun CloudWorks in 2 Minutes!