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https://github.com/ceph/ceph
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90 lines
3.1 KiB
ReStructuredText
90 lines
3.1 KiB
ReStructuredText
restful plugin
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==============
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RESTful plugin offers the REST API access to the status of the cluster
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over an SSL-secured connection.
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Enabling
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--------
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The *restful* module is enabled with::
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ceph mgr module enable restful
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You will also need to configure an SSL certificate below before the
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API endpoint is available. By default the module will accept HTTPS
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requests on port ``8003`` on all IPv4 and IPv6 addresses on the host.
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Securing
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--------
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All connections to *restful* are secured with SSL. You can generate a
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self-signed certificate with the command::
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ceph restful create-self-signed-cert
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Note that with a self-signed certificate most clients will need a flag
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to allow a connection and/or suppress warning messages. For example,
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if the ``ceph-mgr`` daemon is on the same host,::
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curl -k https://localhost:8003/
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To properly secure a deployment, a certificate that is signed by the
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organization's certificate authority should be used. For example, a key pair
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can be generated with a command similar to::
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openssl req -new -nodes -x509 \
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-subj "/O=IT/CN=ceph-mgr-restful" \
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-days 3650 -keyout restful.key -out restful.crt -extensions v3_ca
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The ``restful.crt`` should then be signed by your organization's CA
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(certificate authority). Once that is done, you can set it with::
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ceph config-key set mgr/restful/$name/crt -i restful.crt
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ceph config-key set mgr/restful/$name/key -i restful.key
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where ``$name`` is the name of the ``ceph-mgr`` instance (usually the
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hostname). If all manager instances are to share the same certificate,
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you can leave off the ``$name`` portion::
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ceph config-key set mgr/restful/crt -i restful.crt
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ceph config-key set mgr/restful/key -i restful.key
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Configuring IP and port
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-----------------------
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Like any other RESTful API endpoint, *restful* binds to an IP and
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port. By default, the currently active ``ceph-mgr`` daemon will bind
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to port 8003 and any available IPv4 or IPv6 address on the host.
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Since each ``ceph-mgr`` hosts its own instance of *restful*, it may
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also be necessary to configure them separately. The IP and port
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can be changed via the configuration key facility::
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ceph config-key set mgr/restful/$name/server_addr $IP
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ceph config-key set mgr/restful/$name/server_port $PORT
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where ``$name`` is the ID of the ceph-mgr daemon (usually the hostname).
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These settings can also be configured cluster-wide and not manager
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specific. For example,::
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ceph config-key set mgr/restful/server_addr $IP
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ceph config-key set mgr/restful/server_port $PORT
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If the port is not configured, *restful* will bind to port ``8003``.
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If the address it not configured, the *restful* will bind to ``::``,
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which corresponds to all available IPv4 and IPv6 addresses.
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Load balancer
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-------------
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Please note that *restful* will *only* start on the manager which
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is active at that moment. Query the Ceph cluster status to see which
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manager is active (e.g., ``ceph mgr dump``). In order to make the
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API available via a consistent URL regardless of which manager
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daemon is currently active, you may want to set up a load balancer
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front-end to direct traffic to whichever manager endpoint is
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available.
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