I had to zap and start from scratch my cluster and now I cannot bootstrap  using cephadm

The error is " monmaptool: error writing to /tmp/monmap: (21) Is a directory "

There is no /tmp/monmap directory though 

I also made sure there is nothing in /var/lib/ceph, no "ceph" process , nothing in /etc/systemd/system/ceph* or /etc/ceph AND rebooted the server 

Any help will be appreciated 

Many thanks

Steven