Ganglia's node monitoring daemon — UDP for the metric channel, TCP to dump cluster state as XML.
gmond, the Ganglia monitoring daemon, defaults to 8649 on both transports: a udp_recv_channel (usually multicast) collects metrics from other nodes, and a tcp_accept_channel serves the accumulated cluster state as XML to anything that connects. Both defaults are 8649 in the shipped configuration documentation. The port has no IANA assignment; it is a convention of the Ganglia project, common on HPC clusters and older Linux fleets. Connecting to it with netcat returns the full XML inventory with no authentication.
Do not expose
An open TCP 8649 hands out hostnames, OS versions, load, and the shape of your whole cluster to anyone who connects. Ganglia's only control is an optional ACL — keep it on the management network.
$ nc TARGET 8649 | head -40Seen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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