Dashboard plugin visualizes the statistics of the cluster using a web server
hosted by ceph-mgr.
The dashboard module is enabled with:
ceph mgr module enable dashboard
Like most web applications, dashboard binds to a host name and port.
By default, the ceph-mgr daemon hosting the dashboard (i.e., the
currently active manager) will bind to port 7000 and any available
IPv4 or IPv6 address on the host.
Since each ceph-mgr hosts its own instance of dashboard, it may
also be necessary to configure them separately. The hostname and port
can be changed via the configuration key facility:
ceph config-key set mgr/dashboard/$name/server_addr $IP ceph config-key set mgr/dashboard/$name/server_port $PORT
where $name is the ID of the ceph-mgr who is hosting this
dashboard web app.
These settings can also be configured cluster-wide and not manager specific. For example,:
ceph config-key set mgr/dashboard/server_addr $IP ceph config-key set mgr/dashboard/server_port $PORT
If the port is not configured, the web app will bind to port 7000.
If the address it not configured, the web app will bind to ::,
which corresponds to all available IPv4 and IPv6 addresses.
Please note that the dashboard will only start on the manager which
is active at that moment. Query the Ceph cluster status to see which
manager is active (e.g., ceph mgr dump). In order to make the
dashboard available via a consistent URL regardless of which manager
daemon is currently active, you may want to set up a load balancer
front-end to direct traffic to whichever manager endpoint is
available.