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EDG LCFGng: concepts

EDG LCFGng: concepts. German.Cancio@cern.ch. 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: automatic installation of O.S.

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EDG LCFGng: concepts

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

  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: • automatic installation of O.S. • installation/upgrade/removal of all (rpm-based) software packages • centralized configuration and management of machines • extendible to configure and manage EDG middleware and custom application software

  3. Config files +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 LCFG Config Files Read Profile Load Profile HTTP rdxprof ldxprof Profile Generic Object Make XML Profile Component Web Server Local cache XML Profile LCFG Objects Client nodes Server LCFG system architecture Abstract configuration parameters for all nodes stored in a central repository A collection of components read configuration parameters and generate traditional service config files, and notify/restart affected services

  4. <inet> <allow cfg:template="allow_$ tag_$ daemon_$"> <allow_RECORD cfg:name="telnet"> <allow>192.168., 192.135.30.</allow> </allow_RECORD> ..... </auth> <user_RECORD cfg:name="mickey"> <userhome>/home/MickeyMouseHome</userhome> <usershell>/bin/tcsh</usershell> </user_RECORD> XML profiles LCFG Config Files Read Profile Load Profile HTTP rdxprof ldxprof Profile Generic Object Make XML Profile Component Web Server Local cache XML Profile LCFG Objects Client nodes Server LCFG system architecture Abstract configuration parameters for all nodes stored in a central repository A collection of agents read configuration parameters and either generate traditional config files or directly manipulate various services

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

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

  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 • mkxprof notifies via UDP the nodes affected by the changes • Client-side: another tool (rdxprof) downloads the new profile from the server • usually activated by an LCFG component at boot

  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: • Started when notified of a configuration change (new XML profile) • 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).

  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) • started automatically at boot and via cron. • Can be started by hand.

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

  11. LCFGng Server Installation • The LCFGng server holds the following services: • Network installations (Diskette, PXE) • Software repository (RPM’s) • Configuration Database • This requires to run: • DHCP server: for network boot information • NFS server: for accessing RPM’s and installroot image • 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.

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