After months of working - a harvester node was cordoned in the UI. Rebooting didn't resolve anything. ;) The node has masked services:
proc-sys-fs-binfmt_misc.automount masked disabled
rke2-agent.service masked disabled
rke2-server.service masked disabled
Disk space seems to be enough
/dev/nvme0n1p5 98G 20G 74G 21% /usr/local
/dev/nvme0n1p6 795G 565G 190G 75% /var/lib/harvester/defaultdisk
How do I resolve the masking or better how do find out what is creating the masking resulting rke2 not to start ?