2. EDG LCFGng: concepts German.Cancio@cern.ch

3. Fabric Management Tutorial - n° 2 LCFG (Local ConFiGuration system)  LCFG is originally developed by the Computer Science Department of Edinburgh University  Handles automated installation, configuration and management of machines  Basic features: n automatic installation of O.S. n installation/upgrade/removal of all (rpm-based) software packages n centralized configuration and management of machines n extendible to configure and manage EDG middleware and custom application software

4. Fabric Management Tutorial - n° 3 A collection of components read configuration parameters and generate traditional service config files, and notify/restart affected services Abstract configuration parameters for all nodes stored in a central repository ldxprof Load Profile Generic Component Profile Object rdxprof Read Profile LCFG Objects Local cache Client nodes Web Server HTTP XML Profile LCFG Config Files Make XML Profile Server LCFG system architecture +inet.services telnet login ftp +inet.allow telnet login ftp sshd +inet.allow_telnet ALLOWED_NETWORKS +inet.allow_login ALLOWED_NETWORKS +inet.allow_ftp ALLOWED_NETWORKS +inet.allow_sshd ALL +inet.daemon_sshd yes..... +auth.users mickey +auth.userhome_mickey /home/mickey +auth.usershell_mickey /bin/tcsh +inet.services telnet login ftp +inet.allow telnet login ftp sshd +inet.allow_telnet ALLOWED_NETWORKS +inet.allow_login ALLOWED_NETWORKS +inet.allow_ftp ALLOWED_NETWORKS +inet.allow_sshd ALL +inet.daemon_sshd yes..... +auth.users mickey +auth.userhome_mickey /home/mickey +auth.usershell_mickey /bin/tcsh Config files

5. Fabric Management Tutorial - n° 4 A collection of agents read configuration parameters and either generate traditional config files or directly manipulate various services Abstract configuration parameters for all nodes stored in a central repository ldxprof Load Profile Generic Component Profile Object rdxprof Read Profile LCFG Objects Local cache Client nodes Web Server HTTP XML Profile LCFG Config Files Make XML Profile Server LCFG system architecture 192.168., 192.135.30...... /home/MickeyMouseHome /bin/tcsh 192.168., 192.135.30...... /home/MickeyMouseHome /bin/tcsh XML profiles

6. Fabric Management Tutorial - n° 5 A collection of agents read configuration parameters and either generate traditional config files or directly manipulate various services Abstract configuration parameters for all nodes stored in a central repository ldxprof Load Profile Generic Component Profile Object rdxprof Read Profile LCFG Components Local cache Client nodes Web Server HTTP XML Profile LCFG Config Files Make XML Profile Server LCFG system architecture LCFG client inet auth

7. Fabric Management Tutorial - n° 6 A collection of agents read configuration parameters and either generate traditional config files or directly manipulate various services Abstract configuration parameters for all nodes stored in a central repository ldxprof Load Profile Generic Component Profile Object rdxprof Read Profile LCFG Objects Local cache Client nodes Web Server HTTP XML Profile LCFG Config Files Make XML Profile Server LCFG system architecture Profile Object inet auth /etc/shadow /etc/group /etc/passwd.... mickey:x:999:20::/home/Mickey:/bin/tcsh.... /etc/passwd.... mickey:x:999:20::/home/Mickey:/bin/tcsh....

8. Fabric Management Tutorial - n° 7 LCFG: configuration changes  Server-side: after modifying the config files, a tool ( mkxprof ) is run which recreates the new xml profile for all the nodes affected by the changes n mkxprof notifies via UDP the nodes affected by the changes  Client-side: another tool ( rdxprof ) downloads the new profile from the server n usually activated by an LCFG component at boot

9. Fabric Management Tutorial - n° 8 LCFG: what’s a component?  Component == object  It's a Perl script (also shell scripts accepted for historic reasons)  Each component provides a Configure() method invoked on startup or when configuration changes  A simple and typical component behaviour: n Started when notified of a configuration change (new XML profile) n Configures the appropriate services, by translating config parameters into a traditional config file and ….. notifies a service if necessary (e.g. restarting a init.d service).

10. Fabric Management Tutorial - n° 9 LCFG: Software Package Management  LCFG also manages the RPM packages to be installed on the client nodes.  The software to install is defined in a file on the server containing a list of RPM packages  The required RPM packages are installed/upgraded/removed by the LCFG package manager (updaterpms) n started automatically at boot and via cron. n Can be started by hand.

11. Fabric Management Tutorial - n° 10 Updaterpms and local packages  By default, updaterpms will remove all RPM’s which are not declared in the configuration file of the node. n Be careful when using updaterpms if you have added packages by hand n The EDG version of updaterpms can be configured to allow locally installed packages (disabled by default)

12. Fabric Management Tutorial - n° 11 LCFGng Server Installation  The LCFGng server holds the following services: n Network installations (Diskette, PXE) n Software repository (RPM’s) n Configuration Database  This requires to run: n DHCP server: for network boot information n NFS server: for accessing RPM’s and installroot image n HTTP server: delivers XML node configurations  The LCFGng server has to run Linux RedHat 6.2. Currently, RH62 and RH73 clients can be installed and managed from it.  The LCFGng installation guide tells you in detail how to install the server.  The LCFGng server is the only node not managed by LCFG itself.