https://www.systutorials.com/docs/linux/man/docs/linux/man/1-onnode/
onnode: run commands on CTDB cluster nodes - Linux Manuals (1)
onnode is a utility to run commands on a specific node of a CTDB cluster, or on all nodes. NODES specifies which node(s) to run a command on. See section NODES...
run commandscluster nodeslinux manualsctdb