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Cobbler, Func and Puppet: Tools for Large Scale Environments


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Cobbler, Func and Puppet: …

Cobbler, Func and Puppet:
Tools for Large Scale Environments

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  • 1. Cobbler, Func and Puppet:Tools for Large Scale Environments Francesco Crippa fcrippa @ fedoraproject,org This presentation is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike (BY-NC-SA) 3.0 license.
  • 2. what is a“Large Scale Environment”?
  • 3. From this...Google first WebFarm
  • 4. this!CC by Johnnie Walker:
  • 5. Large scale environments● Huge number of machines● Huge number of environments – Production – Pre-production – Test – Develop● Huge number of people● Need to scale!!!
  • 6. All is complex● An example: make a web server on line● In theory it should be easy: – Buy hardware – Install operating system (next, next, next...) – Install a http server (yum install httpd) – Configure http (vi /etc/httpd/conf/httpd.conf) – Thats all● ...but...●
  • 7. All is complex● In a LSE you need: – 2 web server to maintain service in high availability – 2 geographical sites to support disaster recovery – A testing environment to test configurations – A development environment to setup machines – Backup – Monitoring – Clustering ● Shared storage (SAN) required for each cluster
  • 8. A lot of web servers1... ...7 servers!
  • 9. Where is the complexity?● Web server configuration is simple● But you need to configure: – 7 different web server (with exactly the same configuration!!!) – Keep all configurations in sync – 3 clusters (with different configurations) – Shared storages (maybe with shared filesystems)● The complexity is not on the “business”, but on the “infrastructure”
  • 10. Typical work flow Installing Unconventional Configurations O.S. Tasks● Installing OS to a new hardware● Configure machines as you need● Make (sometimes) unconventional tasks
  • 11. Typical work flowInstalling Unconventional Configurations O.S. Tasks COBBLER PUPPET FUNC
  • 12. All under your control!Copyright by WarnerBras (Matrix)
  • 13. Installing OS... COBBLER
  • 14. OS Installation● Usually KickStart driven● Two main targets for a new installation: – Real hardware – Virtual Machine● Usually expensive because require some manual human tasks – Put booting cd-rom into reader, configure network and location of kickstart...
  • 15. Cobbler● Cobbler is a Linux provisioning server that allows for rapid setup of network installation environments.● It keeps in sync: – DHCP – TFTP – RPM Repositories – KickStarts
  • 16. Importing repositories● Check configuration files● Import repositories [root@a~]# cobbler check [root@a~]# cobbler import  ­­mirror=rsync://servergoeshere/path/to/distro ­­name=fedora9
  • 17. Add profiles and systems● Distros● Profiles● Systems [root@a~]# cobbler distro add [root@a~]# cobbler profile add [root@a~]# cobbler system add
  • 18. Keep in sync● Generate output in: – /tftpboot – /var/www/cobbler – /etc/dhcp.conf [root@a~]# cobbler sync
  • 19. KickStart templates● Kickstart is a template● You can pass values for all your variables through “cobbler system add”...keyboard $KEY...[root@a~]# cobbler system add ­­ksmeta=”KEY=us”
  • 20. Koan● Client side● Provisioning for virtual machines●● koan --profile=RHEL5-i386●● koan -– --profile=RHEL5-i386 --virt
  • 21. Configure all your systems PUPPET
  • 22. Configuration Management– Centralize all configurations into a single place– Defining “templates” to generalize similar configurations (make one, apply hundreds)– Manage exceptions– Make possible for a lot of people to work all together
  • 23. Working all together
  • 24. Working all together
  • 25. Working all together
  • 26. Working all together
  • 27. Configuration Items – Files – Subscribe – Packages – Require – Services – Notify – Users – ... – Groups – Arrays – Mount points – Conditions – ... – ... – You can define your own items :-)
  • 28. A formal definition for HTTPDClass http inherits security-hardening { file { “/etc/httpd/httpd.conf”: owner => apache, mode => 644, require => Package[“httpd”] } package { “httpd”: ensure => “latest” } service { “httpd”: ensure => “running”, enabled => “true”, subscribe => [ File[“/etc/httpd/httpd.conf”], Package[“httpd”] ] }}
  • 29. A formal definition for HTTPDnode inherits default { import httpd}node default { import bacula import nagios import bacula-backup}
  • 30. Puppet architecture – Client (the puppet) polls the server (the puppet- master) to know if there are new configuration files to download (every 30 minutes by default) – Client is recognized through its hostname – Server try to find a right configuration for that hostname, else it uses a “default” config. – ...caching, md5, checksum and ssl are part of infrastructure●
  • 31. Python API for your network FUNC
  • 32. Goals● Manage your hosts as python objects – Groups, ACLs, SSL certificates, ... >>> from func.overlord import client >>> client1 = client.Client(“*.lan”) >>> client1.service.restart(“httpd”) >>>“df ­h”) [root@a~]# func “*.com” call service restart “httpd” [root@a~]# func “*.lan” call command run “df ­h”
  • 33. Modules and new features● Func based on modules architecture● A module support new stuff● 20 modules (libVirt, jboss, info, process, command, iptables, nagios, etc)● Writing a new module is simple.● When you write a module, it works on both CLI and PyScripting, no modification on func are needed.
  • 34. THANK YOU.Credits: Byte-Code, Tango Icons, Crystals Icons