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Efficient OS Provisioning with Ansible and Cobbler for DevOps

Learn about Ansible, Cobbler, and their role in modern warfare, rendering farms, and Wall Street. Understand key commands for Cobbler configuration and system management, as well as Ansible properties and architecture for efficient deployment and orchestration. Case studies include top supercomputers and DNS root.

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Efficient OS Provisioning with Ansible and Cobbler for DevOps

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  1. Ansible & Cobbler • Triangle Devops, Feb 2013

  2. About Me • NCSU 2001 • IBM / Adaptec, Integrian • Red Hat • Puppet Labs, WebAssign, rPath, Cisco

  3. Ansible & Cobbler, In Context OS Provisioning Red Hat Satellite cobbler Task Exec virt-factory func ansible OS Config puppet chef cfengine capistrano/fabric Deployment

  4. Cobbler • Before configuration, there must be OS • PXE tree management • DHCP, DNS • Yum Repos • Power • Lightweight CMDB

  5. Some Cobbler Users • Top 500 Supercomputers • DNS root serves for .com and .net • Modern Warfare • Render farms • Wall Street

  6. Some Commands • cobbler import --name=Fedora18 --path=/mnt/dvd • cobbler system add --name=foo --mac= AA:BB:CC:DD:EE:FF --ip=2.2.2.2 --profile= Fedora18-x86_64 • cobbler system edit --name=foo --netboot-enabled=1 • cobbler system reboot --name=foo

  7. Ansible • A year old today. • 1100+ followers on github • Top 10 New OSS Projects of 2012

  8. Several Tools In One • Configuration (cfengine, Chef, Puppet) • Deployment (Capistrano, Fabric) • Ad-Hoc Tasks (Func) • Multi-Tier Orchestration (Juju, sort of)

  9. Properties • Minimal learning curve, auditability • No bootstrapping • No DAG ordering, Fails Fast • No agents (other than sshd) - 0 resource consumption when not in use • No server • No additional PKI • Modules in any language • YAML, not code • SSH by default • Strong multi-tier solution

  10. Architecture

  11. Focus: Orchestration • Rolling Updates • Multi-tier: Web Tier, DB Tier, Content Tier • Monitoring, Outage Windows • Load Balancing, Pools • Email, REST, Logging, Interaction, etc

  12. Inventory File [webservers] asdf.example.com [dbservers] jkl.example.com mnop.example.com

  13. External Inventory • Cobbler • OpenStack • EC2 or Eucalyptus Cloud • Etc

  14. Basic Task Example • ansible durham -m ping • ansible webservers -m service -a “name=httpd state=restarted” --limit durham

  15. - hosts: all user: mpdehaan sudo: True tasks: - name: ntp should be installed yum: name=ntp state=present - name: template ntp.conf template: src=ntp.conf.j2 dest=/etc/ntp.conf notify: - restart ntpd - name: ntp should be running/enabled service: name=ntp state=running enabled=yes handlers: - name: restart ntpd service: name=ntpd state=restarted

  16. __________________________________ < TASK: [write app configuration] > --------------------------------- \ ^__^ \ (oo)\_______ (__)\ )\/\ ||----w | || || ok: [127.0.0.1]

  17. Fireball Mode

  18. Pull Mode

  19. API import ansible.runner import sys # construct the ansible runner and execute on all hosts results = ansible.runner.Runner(     pattern='*', forks=10,     module_name='command', module_args='/usr/bin/uptime', ).run()

  20. Questions?@laserllamamichael.dehaan@gmail.comcobbler.github.comansible.ccQuestions?@laserllamamichael.dehaan@gmail.comcobbler.github.comansible.cc

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