Comment 10 for bug 585108

Node registration amounts to only two things: the IP being added to NODES= in eucalyptus.conf (or to nodes.list on the UEC) and keys synchronized between the CC node and the NC node. Neither CLC nor CC are involved in the operation, so they do not need to be running. For keys to be present, though, CLC must have generated them and synchronized them with the CC during cluster registration. Once CC notices a change in eucalyptus.conf, it will attempt to re-parse it, thus picking up a changed NODES= entry. (I suspect the change to nodes.list in UEC is not picked up, so CC probably needs to be re-started.)