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257 lines
7.5 KiB
ReStructuredText
257 lines
7.5 KiB
ReStructuredText
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===============================
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radosgw -- rados REST gateway
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===============================
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.. program:: radosgw
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Synopsis
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========
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| **radosgw**
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Description
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===========
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:program:`radosgw` is an HTTP REST gateway for the RADOS object store, a part
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of the Ceph distributed storage system. It is implemented as a FastCGI
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module using libfcgi, and can be used in conjunction with any FastCGI
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capable web server.
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Options
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=======
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.. option:: -c ceph.conf, --conf=ceph.conf
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Use ``ceph.conf`` configuration file instead of the default
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``/etc/ceph/ceph.conf`` to determine monitor addresses during startup.
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.. option:: -m monaddress[:port]
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Connect to specified monitor (instead of looking through ``ceph.conf``).
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.. option:: -i ID, --id ID
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Set the ID portion of name for radosgw
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.. option:: -n TYPE.ID, --name TYPE.ID
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Set the rados user name for the gateway (eg. client.radosgw.gateway)
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.. option:: --cluster NAME
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Set the cluster name (default: ceph)
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.. option:: -d
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Run in foreground, log to stderr
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.. option:: -f
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Run in foreground, log to usual location
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.. option:: --rgw-socket-path=path
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Specify a unix domain socket path.
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.. option:: --rgw-region=region
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The region where radosgw runs
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.. option:: --rgw-zone=zone
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The zone where radosgw runs
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Configuration
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=============
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Earlier RADOS Gateway had to be configured with ``Apache`` and ``mod_fastcgi``.
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Now, ``mod_proxy_fcgi`` module is used instead of ``mod_fastcgi``.
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``mod_proxy_fcgi`` works differently than a traditional FastCGI module. This
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module requires the service of ``mod_proxy`` which provides support for the
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FastCGI protocol. So, to be able to handle FastCGI protocol, both ``mod_proxy``
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and ``mod_proxy_fcgi`` have to be present in the server. Unlike ``mod_fastcgi``,
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``mod_proxy_fcgi`` cannot start the application process. Some platforms have
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``fcgistarter`` for that purpose. However, external launching of application
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or process management may be available in the FastCGI application framework
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in use.
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``Apache`` can be configured in a way that enables ``mod_proxy_fcgi`` to be used
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with localhost tcp or through unix domain socket. ``mod_proxy_fcgi`` that doesn't
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support unix domain socket such as the ones in Apache 2.2 and earlier versions of
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Apache 2.4, needs to be configured for use with localhost tcp. Later versions of
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Apache like Apache 2.4.9 or later support unix domain socket and as such they
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allow for the configuration with unix domain socket instead of localhost tcp.
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The following steps show the configuration in Ceph's configuration file i.e,
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``/etc/ceph/ceph.conf`` and the gateway configuration file i.e,
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``/etc/httpd/conf.d/rgw.conf`` (RPM-based distros) or
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``/etc/apache2/conf-available/rgw.conf`` (Debian-based distros) with localhost
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tcp and through unix domain socket:
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#. For distros with Apache 2.2 and early versions of Apache 2.4 that use
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localhost TCP and do not support Unix Domain Socket, append the following
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contents to ``/etc/ceph/ceph.conf``::
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[client.radosgw.gateway]
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host = {hostname}
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keyring = /etc/ceph/ceph.client.radosgw.keyring
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rgw socket path = ""
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log file = /var/log/ceph/client.radosgw.gateway.log
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rgw frontends = fastcgi socket_port=9000 socket_host=0.0.0.0
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rgw print continue = false
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#. Add the following content in the gateway configuration file:
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For Debian/Ubuntu add in ``/etc/apache2/conf-available/rgw.conf``::
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<VirtualHost *:80>
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ServerName localhost
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DocumentRoot /var/www/html
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ErrorLog /var/log/apache2/rgw_error.log
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CustomLog /var/log/apache2/rgw_access.log combined
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# LogLevel debug
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RewriteEngine On
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RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
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SetEnv proxy-nokeepalive 1
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ProxyPass / fcgi://localhost:9000/
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</VirtualHost>
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For CentOS/RHEL add in ``/etc/httpd/conf.d/rgw.conf``::
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<VirtualHost *:80>
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ServerName localhost
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DocumentRoot /var/www/html
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ErrorLog /var/log/httpd/rgw_error.log
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CustomLog /var/log/httpd/rgw_access.log combined
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# LogLevel debug
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RewriteEngine On
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RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
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SetEnv proxy-nokeepalive 1
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ProxyPass / fcgi://localhost:9000/
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</VirtualHost>
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#. For distros with Apache 2.4.9 or later that support Unix Domain Socket,
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append the following configuration to ``/etc/ceph/ceph.conf``::
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[client.radosgw.gateway]
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host = {hostname}
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keyring = /etc/ceph/ceph.client.radosgw.keyring
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rgw socket path = /var/run/ceph/ceph.radosgw.gateway.fastcgi.sock
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log file = /var/log/ceph/client.radosgw.gateway.log
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rgw print continue = false
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#. Add the following content in the gateway configuration file:
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For CentOS/RHEL add in ``/etc/httpd/conf.d/rgw.conf``::
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<VirtualHost *:80>
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ServerName localhost
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DocumentRoot /var/www/html
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ErrorLog /var/log/httpd/rgw_error.log
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CustomLog /var/log/httpd/rgw_access.log combined
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# LogLevel debug
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RewriteEngine On
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RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
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SetEnv proxy-nokeepalive 1
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ProxyPass / unix:///var/run/ceph/ceph.radosgw.gateway.fastcgi.sock|fcgi://localhost:9000/
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</VirtualHost>
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The latest version of Ubuntu i.e, 14.04 ships with ``Apache 2.4.7`` that
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does not have Unix Domain Socket support in it and as such it has to be
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configured with localhost tcp. The Unix Domain Socket support is available in
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``Apache 2.4.9`` and later versions. A bug has been filed to backport the UDS
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support to ``Apache 2.4.7`` for ``Ubuntu 14.04``.
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See: https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1411030
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#. Generate a key for radosgw to use for authentication with the cluster. ::
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ceph-authtool -C -n client.radosgw.gateway --gen-key /etc/ceph/keyring.radosgw.gateway
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ceph-authtool -n client.radosgw.gateway --cap mon 'allow rw' --cap osd 'allow rwx' /etc/ceph/keyring.radosgw.gateway
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#. Add the key to the auth entries. ::
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ceph auth add client.radosgw.gateway --in-file=keyring.radosgw.gateway
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#. Start Apache and radosgw.
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Debian/Ubuntu::
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sudo /etc/init.d/apache2 start
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sudo /etc/init.d/radosgw start
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CentOS/RHEL::
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sudo apachectl start
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sudo /etc/init.d/ceph-radosgw start
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Usage Logging
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=============
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:program:`radosgw` maintains an asynchronous usage log. It accumulates
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statistics about user operations and flushes it periodically. The
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logs can be accessed and managed through :program:`radosgw-admin`.
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The information that is being logged contains total data transfer,
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total operations, and total successful operations. The data is being
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accounted in an hourly resolution under the bucket owner, unless the
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operation was done on the service (e.g., when listing a bucket) in
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which case it is accounted under the operating user.
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Following is an example configuration::
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[client.radosgw.gateway]
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rgw enable usage log = true
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rgw usage log tick interval = 30
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rgw usage log flush threshold = 1024
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rgw usage max shards = 32
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rgw usage max user shards = 1
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The total number of shards determines how many total objects hold the
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usage log information. The per-user number of shards specify how many
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objects hold usage information for a single user. The tick interval
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configures the number of seconds between log flushes, and the flush
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threshold specify how many entries can be kept before resorting to
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synchronous flush.
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Availability
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============
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:program:`radosgw` is part of Ceph, a massively scalable, open-source, distributed
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storage system. Please refer to the Ceph documentation at http://ceph.com/docs for
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more information.
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See also
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========
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:doc:`ceph <ceph>`\(8)
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:doc:`radosgw-admin <radosgw-admin>`\(8)
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