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