Ansible & CobblerTriangle Devops, Feb 2013

About Me

•NCSU 2001

•IBM / Adaptec, Integrian

•Red Hat

•Puppet Labs, WebAssign, rPath, Cisco

Ansible & Cobbler, In Context

cobblercobblerRed Hat Red Hat SatelliteSatellite

cfenginecfenginepuppepuppe

tt chefchef

ansiblansiblee

funcfuncvirt-factoryvirt-factory

capistrano/capistrano/fabricfabric

OS Provisioning

OS Config

Deployment

Task Exec

Cobbler•Before configuration, there must be

OS

•PXE tree management

•DHCP, DNS

•Yum Repos

•Power

•Lightweight CMDB

Some Cobbler Users

•Top 500 Supercomputers

•DNS root serves for .com and .net

•Modern Warfare

•Render farms

•Wall Street

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

Ansible

•A year old today.

•1100+ followers on github

•Top 10 New OSS Projects of 2012

Several Tools In One

•Configuration (cfengine, Chef, Puppet)

•Deployment (Capistrano, Fabric)

•Ad-Hoc Tasks (Func)

•Multi-Tier Orchestration (Juju, sort of)

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

Architecture

Focus: Orchestration

•Rolling Updates

•Multi-tier: Web Tier, DB Tier, Content Tier

•Monitoring, Outage Windows

•Load Balancing, Pools

•Email, REST, Logging, Interaction, etc

Inventory File

[webservers]asdf.example.com

[dbservers]jkl.example.com

mnop.example.com

External Inventory

•Cobbler

•OpenStack

•EC2 or Eucalyptus Cloud

•Etc

Basic Task Example

•ansible durham -m ping

•ansible webservers -m service -a “name=httpd state=restarted” --limit durham

- 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

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

ok: [127.0.0.1]ok: [127.0.0.1]

Fireball Mode

Pull Mode

API

import ansible.runnerimport sys

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

Questions?

@laserllamamichael.dehaan@gmail.com

cobbler.github.comansible.cc