97 lines
4.6 KiB
ReStructuredText
97 lines
4.6 KiB
ReStructuredText
.. _shared_file_systems_network_plugins:
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================
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Network plug-ins
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================
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The Shared File Systems service architecture defines an abstraction layer for
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network resource provisioning and allowing administrators to choose from a
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different options for how network resources are assigned to their projects'
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networked storage. There are a set of network plug-ins that provide a variety
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of integration approaches with the network services that are available with
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OpenStack.
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What is a network plugin in Manila?
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-----------------------------------
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A network plugin is a python class that uses a specific facility (e.g.
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Neutron network) to provide network resources to the
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:term:`manila-share` service.
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When to use a network plugin?
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-----------------------------
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A Manila `share driver` may be configured in one of two modes, where it is
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managing the lifecycle of `share servers` on its own or where it is merely
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providing storage resources on a pre-configured share server. This mode
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is defined using the boolean option `driver_handles_share_servers` in the
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Manila configuration file. A network plugin is only useful when a driver is
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handling its own share servers.
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.. note::
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Not all share drivers support both modes. Each driver must report which
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mode(s) it supports to the manila-share service.
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When `driver_handles_share_servers` is set to `True`, a share driver will be
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called to create share servers for shares using information provided within a
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`share network`. This information will be provided to one of the enabled
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network plugins that will handle reservation, creation and deletion of
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network resources including `IP addresses` and `network interfaces`.
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The Shared File Systems service may need a network resource provisioning if
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share service with specified driver works in mode, when a share driver manages
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lifecycle of share servers on its own. This behavior is defined by a flag
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``driver_handles_share_servers`` in share service configuration. When
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``driver_handles_share_servers`` is set to ``True``, a share driver will be
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called to create share servers for shares using information provided within a
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share network. This information will be provided to one of the enabled network
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plug-ins that will handle reservation, creation and deletion of network
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resources including IP addresses and network interfaces.
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What network plug-ins are available?
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------------------------------------
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There are two network plug-ins and three python classes in the
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Shared File Systems service:
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#. Network plug-in for using the OpenStack Networking service. It allows to use
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any network segmentation that the Networking service supports. It is up to
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each share driver to support at least one network segmentation type.
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a) ``manila.network.neutron.neutron_network_plugin.NeutronNetworkPlugin``.
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This is a default network plug-in. It requires the ``neutron_net_id`` and
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the ``neutron_subnet_id`` to be provided when defining the share network
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that will be used for the creation of share servers. The user may define
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any number of share networks corresponding to the various physical
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network segments in a project environment.
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b) ``manila.network.neutron.neutron_network_plugin.NeutronSingleNetworkPlugin``.
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This is a simplification of the previous case. It accepts values for
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``neutron_net_id`` and ``neutron_subnet_id`` from the ``manila.conf``
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configuration file and uses one network for all shares.
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When only a single network is needed, the NeutronSingleNetworkPlugin (1.b)
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is a simple solution. Otherwise NeutronNetworkPlugin (1.a) should be chosen.
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#. Network plug-in for specifying networks independently from OpenStack
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networking services.
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a) ``manila.network.standalone_network_plugin.StandaloneNetworkPlugin``.
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This plug-in uses a pre-existing network that is available to the
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manila-share host. This network may be handled either by OpenStack or be
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created independently by any other means. The plug-in supports any type
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of network - flat and segmented. As above, it is completely up to the
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share driver to support the network type for which the network plug-in is
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configured.
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.. note::
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The ip version of the share network is defined by the flags of
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``network_plugin_ipv4_enabled`` and ``network_plugin_ipv6_enabled`` in the
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``manila.conf`` configuration since Pike. The ``network_plugin_ipv4_enabled``
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default value is set to True. The ``network_plugin_ipv6_enabled`` default value is
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set to False. If ``network_plugin_ipv6_enabled`` option is True, the value of
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``network_plugin_ipv4_enabled`` will be ignored, it means to support both IPv4 and
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IPv6 share network.
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