Hi, I've been running Linux as a workstation OS for years, and have been dealing with Windows networks and standalone Linux servers for a while now. However, the time has come for me to complete redo the server installation and am looking to move to a complete CentOS install base, with only Windows workstations. My question is the following. I've been searching online for a good reference to describe good practices when building a linux network, but haven't really been able to find much when it comes to best practices for user administration, ACLs, "optimal" (or recommended) file locations, etc. For example, I know I need an LDAP server, but not sure how that ties into system login, or how to use a Linux LDAP server as the basis for a primary domain controller (is it still called that given Windows AD world?), etc. Or even how to properly create group structures and ACLs that accurately reflect group ownership/etc. The octal permissions at the file level are only good enough for a single group; I need to give multiple groups different permissions on the same files, etc. I realize that there are a lot of questions that I need to research, but I was hoping someone could point me in the direction of some advanced admin docs with best practices, etc. Most of the stuff I find relates on how to set up a basic standalone PC, without any reference to how to network together a bunch of servers running off central authentication, etc... Thanks for the advice! Eric