Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.. _object-gateway:
+
+=====================
+ Ceph Object Gateway
+=====================
+
+:term:`Ceph Object Gateway` is an object storage interface built on top of
+``librados``. It provides a RESTful gateway between applications and Ceph
+Storage Clusters. :term:`Ceph Object Storage` supports two interfaces:
+
+#. **S3-compatible:** Provides object storage functionality with an interface
+   that is compatible with a large subset of the Amazon S3 RESTful API.
+
+#. **Swift-compatible:** Provides object storage functionality with an interface
+   that is compatible with a large subset of the OpenStack Swift API.
+
+Ceph Object Storage uses the Ceph Object Gateway daemon (``radosgw``), an HTTP
+server designed for interacting with a Ceph Storage Cluster. The Ceph Object
+Gateway provides interfaces that are compatible with both Amazon S3 and
+OpenStack Swift, and it has its own user management. Ceph Object Gateway can
+store data in the same Ceph Storage Cluster in which data from Ceph File System
+clients and Ceph Block Device clients is stored. The S3 API and the Swift API
+share a common namespace, which makes it possible to write data to a Ceph
+Storage Cluster with one API and then retrieve that data with the other API.
+
+.. ditaa::
+
+            +------------------------+ +------------------------+
+            |   S3 compatible API    | |  Swift compatible API  |
+            +------------------------+-+------------------------+
+            |                      radosgw                      |
+            +---------------------------------------------------+
+            |                      librados                     |
+            +------------------------+-+------------------------+
+            |          OSDs          | |        Monitors        |
+            +------------------------+ +------------------------+
+
+.. note:: Ceph Object Storage does **NOT** use the Ceph Metadata Server.
+
+
+.. toctree::
+   :maxdepth: 1
+
+   HTTP Frontends <frontends>
+   Multisite Configuration <multisite>
+   Pool Placement and Storage Classes <placement>
+   Multisite Sync Policy Configuration <multisite-sync-policy>
+   Configuring Pools <pools>
+   Config Reference <config-ref>
+   Admin Guide <admin>
+   S3 API <s3>
+   Data caching and CDN <rgw-cache.rst>
+   Swift API <swift>
+   Admin Ops API <adminops>
+   Python binding <api>
+   Export over NFS <nfs>
+   OpenStack Keystone Integration <keystone>
+   OpenStack Barbican Integration <barbican>
+   HashiCorp Vault Integration <vault>
+   KMIP Integration <kmip>
+   Open Policy Agent Integration <opa>
+   Multi-tenancy <multitenancy>
+   Compression <compression>
+   LDAP Authentication <ldap-auth>
+   Server-Side Encryption <encryption>
+   Bucket Policy <bucketpolicy>
+   Dynamic bucket index resharding <dynamicresharding>
+   Multi factor authentication <mfa>
+   Sync Modules <sync-modules>
+   Bucket Notifications <notifications>
+   Data Layout in RADOS <layout>
+   STS <STS>
+   STS Lite <STSLite>
+   Keycloak <keycloak>
+   Session Tags <session-tags>
+   Role <role>
+   Orphan List and Associated Tooling <orphans>
+   OpenID Connect Provider <oidc>
+   troubleshooting
+   Manpage radosgw <../../man/8/radosgw>
+   Manpage radosgw-admin <../../man/8/radosgw-admin>
+   QAT Acceleration for Encryption and Compression <qat-accel>
+   S3-select <s3select>
+   Lua Scripting <lua-scripting>
+   D3N Data Cache <d3n_datacache>
+   Cloud Transition <cloud-transition>
+