The mcmd agent that provisions and controls a MySQL NDB Cluster — an admin plane, not a database.
MySQL Cluster Manager runs an agent process, mcmd, on each cluster host; its bind_port defaults to 1862, and the mcm client (and a plain mysql client pointed at --port=1862) connects there to issue cluster commands. Oracle registered the port with IANA in 2009 as "mysql-cm-agent". Commands sent over it create and delete clusters, start and stop ndbd and mysqld processes, and change configuration — so the port belongs to the management plane of an NDB Cluster, distinct from the 3306 data path.
Do not expose
Anything that authenticates to the agent can start, stop, and reconfigure every node in the cluster; keep 1862 on the cluster's private management network and reach it over a VPN or bastion.
$ mysql -h TARGET -P 1862 --protocol=TCP -u mcmd -p -e 'show status --cluster mycluster;'Seen 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.
Get Beige Box →also available as JSON · Markdown
Corrections or a missing port? Reply @rimrocksystems.