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Qu attor: An a dministration t oolki t for o ptimizing r esources

Quattor is an administration toolkit designed to optimize resources by managing the configuration, installation, and management of target fabric nodes. It provides centralized control of configuration data, autonomous target nodes, reproducibility, scalability, and portability.

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Qu attor: An a dministration t oolki t for o ptimizing r esources

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  1. Quattor: An administration toolkit for optimizing resources Marco Emilio Poleggi - CERN/INFN-CNAF German Cancio - CERN {Marco.Poleggi,German.Cancio}@cern.ch

  2. Outline • Design concepts • Configuration management • Configuration deployment • Target node administration Quattor @ LCG-T2 workshop

  3. Design concepts: goal Taking care of the configuration, installation and management of target fabric nodes • A Configuration Database holds the “desired state” of all fabric elements, arranged in template hierarchies • Cluster information: name and type, operating system, architecture, etc. • Node setup: hardware (HD, RAM, network…), software packages, system services, etc. • On target nodes, autonomous management agents are responsible of • Base installation • Software installation and management • Service (re-)configuration Quattor @ LCG-T2 workshop

  4. Design concepts: features • Centralized control of configuration data: • Unique configuration storage • Automatic notification of changes to the target nodes • Autonomous target nodes: • Pull-based re-configuration (no remote scripts, no network file systems) • Local configuration files • Reproducibility: • Idempotent, atomic operations • Scalability: • Through load balancing, proxy caching, scalable protocols: O(10k) nodes! • Based on well-known standards: • HTTPS, XML, RPM/PKG, SysV init scripts, etc. • Portability: • Linux and Solaris currently supported Quattor @ LCG-T2 workshop

  5. Outline • Design concepts • Configuration management • Configuration Database (CDB) • Configuration deployment • Target node administration Quattor @ LCG-T2 workshop

  6. CDB SQL RDBMS panc XML HTTP(S) HLD to LLD SOAP CCM perl Cache PAN templates script users Configuration Management Infrastructure Monitoring, auditing, presentation, … Configuration agent Configuration agent Configuration Agent for service foo Target node Quattor clients Quattor @ LCG-T2 workshop

  7. Configuration Database (CDB)… • Keeps complete configuration information in a unique repository • Uses namespaces for a hierarchical management – NEW! • Uses Access Control Lists (ACLs) to restrict user’s scope – NEW! • Remote interaction but centralized control • All changes are tested on the server before commit • Data consistency is enforced by a transactional mechanism • Concurrent operations are isolated in user sessions • Allows disconnected operations • All changes are done in transactions along a user session • Conflicts of concurrent modification of the same template are detected • Configuration is validated and kept under version control • Built-in validation, e.g. types • User-defined validation, e.g. range of high-level parameters Quattor @ LCG-T2 workshop

  8. …Configuration Database (CDB) • Going back to previous versions of the configuration is possible • Full history is kept in CVS • Support for different user authentication mechanisms: X.509 – NEW!, Kerberos5 – NEW!, encrypted passwords. Easily extensible! • Optional SQL module for feeding data to Oracle and/or MySQL Subversion-based alternative (SCDB) • Developed at LAL • Decentralized control on user workstations • Local data check-out • Testing and validation • Central Subversion (instead of CVS) repository Quattor @ LCG-T2 workshop

  9. Outline • Design concepts • Configuration management • Configuration deployment • Automated Installation Infrastructure (AII) • Configuration Cache Manager (CCM) • Node Configuration Manager (NCM) • Target node administration Quattor @ LCG-T2 workshop

  10. Software server Packages (RPM, PKG) http cache SW package Manager (SPMA) nfs Base OS RPM, PKG SWRep packages ftp Vendor System installer SL3/4, RHES,… CCM Node Configuration Manager (NCM) Node (re)install Install Manager Managing target nodes (clients) Target nodes Installed software kernel, system, applications… Install server System services AFS, LSF… nfs/http dhcp pxe CDB Quattor @ LCG-T2 workshop

  11. Automated Installation Infrastructure (AII) • Sits on top of the standard vendor installer, and configures it • Which OS version to install • Network and partition information • Core packages • Custom post-installation instructions • Two-phase process • Base OS installation • Quattor client SW installation and reconfiguration • Automated generation of control file (KickStart) • It also takes care of managing DHCP (and TFTP/PXE) entries • Configuration information is taken from CDB or via command line • Available for RedHat-based Linuxes, through the Anaconda installer Quattor @ LCG-T2 workshop

  12. CCM CCM fetch CDP listend Configuration Cache Manager (CCM) • Runs on every managed node • Provides a local interface to the node’s configuration information (NVA API) • Information is downloaded from CDB and cached: • Faster access to the configuration • Avoids peaks on CDB servers • Supports disconnected operations • Synchronization with CDB through notification/polling: Configuration Distribution Protocol (CDP) • Client authentication trough X.509 – NEW! Client Node Profiles cache NVA API HTTP(S) CDP CDB Quattor @ LCG-T2 workshop

  13. Client Node NVA API CCM ncm-foo foo’s configuration cdispd NCD Node Configuration Manager (NCM)… • NCM is responsible for ensuring that reality on a node reflects the desired state in CDB • Service-specific plug-ins, called ncm-components, make the necessary changes: • (Re-)generate local configuration files, e.g. /etc/sshd/sshd_config • Restart/reload daemons via SysV-style scripts • Resolve configuration dependencies, e.g. configure network before sendmail • Triggering of ncm-components • invoked on boot • via cron • upon changes in CDB Quattor @ LCG-T2 workshop

  14. … the NCM framework • Is extensible • Several ncm-components already available for system and Grid/LCG services • QWG’s suite • ncm-yaim • minimal Perl skills required for writing new components ;-) • Has Library support for easy development • configuration data access • file manipulation • process management • exception handling • Features commands for querying the node’s configuration Quattor @ LCG-T2 workshop

  15. Outline • Design concepts • Configuration management • Configuration deployment • Target node administration • SoftWare Repository (SWRep) • Software Package Management (SPM) Quattor @ LCG-T2 workshop

  16. SWRep packages http nfs ftp Client Node user Software Repository (SWRep)… • Hierarchical storage structure • Platforms: e.g., i386, x86_64 • Areas: e.g., /edg/quattor • Extensible to accommodate different packagers: RedHat’s RPM, Solaris’ PKG, Debian’s pkg, etc. • Multiple package versions support • User management via ftp-like commands • SOAP-based interface – NEW! - with the same plug-in-based authentication as for CDB (X.509, etc.- NEW!) • ACL-based mechanism to grant/deny modification rights for package “areas” Software server SOAP Quattor @ LCG-T2 workshop

  17. …Software Repository (SWRep) • Client access via standard protocols • HTTP, AFS/NFS, FTP • Based upon off-the-shelf software • Apache Web server as file repository • rsync for mirroring/redundancy • Scalability: • Up to ~800 nodes with single-server set-up • O(10k) nodeswithproxy-caches + load balancing (see CERN-CC reverse proxy network) • Squid support through an NCM component – NEW! Quattor @ LCG-T2 workshop

  18. Client Node SWRep NVA API CCM spma’s configuration ncm-spma rpmt SPMA NCD Package cache http nfs ftp Software Package Management (SPM)… • The SPM subsystem manages all or a subset of packages on the nodes • Full-control mode: wipe out unknown packages, (re-)install missing ones. Typical mode for production nodes • Non-intrusive mode: configurable management to allow user-installed packages with priority control. Typical mode for development/desktop nodes • SPMA (SPM Agent) is a package manager (does a lot more than upgrading!) • Multiple versions of the same package can be installed • Upgrade/downgrade control • Transactional behavior through rpmt – NEW Python implementation Quattor @ LCG-T2 workshop

  19. …Software Package Management (SPM) • Portable, thanks to an extensible plug-in-based framework • Plug-ins currently available for Linux RPM and Solaris PKG • Scalability is assured by • Standard protocols • Time smearing • Package pre-caching • Forward/reverse proxy-cache support • Support for multiple repositories • Configurable remotely via CDB, or locally Quattor @ LCG-T2 workshop

  20. http://quattor.org Quattor @ LCG-T2 workshop

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