mirror of https://github.com/ceph/ceph
103 lines
3.8 KiB
ReStructuredText
103 lines
3.8 KiB
ReStructuredText
=================
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RGW Multi-tenancy
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=================
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.. versionadded:: Jewel
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The multi-tenancy feature allows to use buckets and users of the same
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name simultaneously by segregating them under so-called ``tenants``.
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This may be useful, for instance, to permit users of Swift API to
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create buckets with easily conflicting names such as "test" or "trove".
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From the Jewel release onward, each user and bucket lies under a tenant.
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For compatibility, a "legacy" tenant with an empty name is provided.
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Whenever a bucket is referred without an explicit tenant, an implicit
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tenant is used, taken from the user performing the operation. Since
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the pre-existing users are under the legacy tenant, they continue
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to create and access buckets as before. The layout of objects in RADOS
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is extended in a compatible way, ensuring a smooth upgrade to Jewel.
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Administering Users With Explicit Tenants
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=========================================
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Tenants as such do not have any operations on them. They appear and
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and disappear as needed, when users are administered. In order to create,
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modify, and remove users with explicit tenants, either an additional
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option --tenant is supplied, or a syntax "<tenant>$<user>" is used
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in the parameters of the radosgw-admin command.
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Examples
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--------
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Create a user testx$tester to be accessed with S3::
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# radosgw-admin --tenant testx --uid tester --display-name "Test User" --access_key TESTER --secret test123 user create
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Create a user testx$tester to be accessed with Swift::
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# radosgw-admin --tenant testx --uid tester --display-name "Test User" --subuser tester:test --key-type swift --access full user create
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# radosgw-admin --subuser 'testx$tester:test' --key-type swift --secret test123
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Note that the subuser with explicit tenant had to be quoted in the shell.
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Accessing Buckets with Explicit Tenants
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=======================================
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When a client application accesses buckets, it always operates with
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credentials of a particular user. As mentioned above, every user belongs
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to a tenant. Therefore, every operation has an implicit tenant in its
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context, to be used if no tenant is specified explicitly. Thus a complete
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compatibility is maintained with previous releases, as long as the
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referred buckets and referring user belong to the same tenant.
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In other words, anything unusual occurs when accessing another tenant's
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buckets *only*.
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Extensions employed to specify an explicit tenant differ according
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to the protocol and authentication system used.
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S3
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--
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In case of S3, a colon character is used to separate tenant and bucket.
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Thus a sample URL would be::
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https://ep.host.dom/tenant:bucket
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Here's a simple Python sample::
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from boto.s3.connection import S3Connection, OrdinaryCallingFormat
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c = S3Connection(
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aws_access_key_id="TESTER",
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aws_secret_access_key="test123",
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host="ep.host.dom",
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calling_format = OrdinaryCallingFormat())
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bucket = c.get_bucket("test5b:testbucket")
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Note that it's not possible to supply an explicit tenant using
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a hostname. Hostnames cannot contain colons, or any other separators
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that are not already valid in bucket names. Using a period creates an
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ambiguous syntax. Therefore, the bucket-in-URL-path format has to be
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used.
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Swift with built-in authenticator
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---------------------------------
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TBD -- not in test_multen.py yet
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Swift with Keystone
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-------------------
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TBD -- don't forget to explain the function of
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rgw keystone make new tenants = true
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in commit e9259486decab52a362443d3fd3dec33b0ec654f
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Notes and known issues
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----------------------
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Just to be clear, it is not possible to create buckets in other
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tenants at present. The owner of newly created bucket is extracted
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from authentication information.
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This document needs examples of administration of Keystone users.
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The keystone.rst may need to be updated.
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