In our lab, all the LDAP users are assigned to a group vboxusers whose home directory is present in the server. We are using NFS to mount the home directory of an user to the client machines. I was installing a new client machine and added it to the network. I configured the LDAP in this new machine and strangely there was a group cimsrvr which was assigned the same ID as vboxusers in the remaining client machines.
In the newly installed machine, I find the below entry in /etc/group file.
In all of the remaining client machines, I find the entry in /etc/group file as,
I was assigning permission to all the users belonging to vboxusers to access Virtualbox. When I assigned the permissions to cimsrvr in the new machine, the vboxusers were able to access Virtualbox without any problem. So, I figured out the group name is just for our understanding and the machine just uses the group ID. That's why all the users belonging to group 501 were able to access VirtualBox.
My question is, how did the cimsrvr group got assigned to 501 in the first place when I did not create any group by that name?