RocksUserAdmininistration

You can add and delete users on Rocks using the useradd and userdel scripts, same as always. Under the covers, Rocks uses the 411 service to distribute authentication files. 411 is a multicast server that publishes a set of files to all compute nodes:

  /etc/passwd
  /etc/shadow
  /etc/groups
  /etc/auto.home

If these files get out of sync on the nodes, users won't be able to log in. We've had it happen a couple of times, and Carlos recently found a trick to get the files to sync.

to force a node to get the authentication files do on the node:

  411get --all

to force all nodes to get the files do on the frontend:

  service 411 restart

Also see EspressoNFS as we have moved most user files to the nas-0-0 server.