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Release Info

Application load-distribution across commodity Instances has invariably increased the number of systems to manage. It's never been cheaper nor faster to spawn Instances and be quickly productive. To help reduce administrative overhead, tools that can operate in parallel and use templates offer us simplified management with increased visibility. Ansible is among the cohort of such tools that should be considered when tasked with managing numerous Instances.

Release Syllabus

Configuration Management with Ansible

Configuration Management - Ansible

  • Setup Environment
    • Discuss key features
    • Configure package repository
    • Install Ansible
    • Define Inventory
    • Ensure proper SSH environment
    • Confirm reachability
  •  
  • Infrastructure Groups
    • Identify common classes
    • Define common groups
    • Associate managed nodes with groups
    • Target nodes via groups with commands
    • Explore output
  •  
  • Ad-Hoc Commands
    • Discuss usability
    • Contrast with: 'ssh' && 'parallel-ssh'
    • Run non-privileged | privileged commands
    • Check and reload service
    • Reboot targets
    • Confirm functionality
  •  
  • Modules
    • Discuss applicability
    • Use 'service' module for common tasks
    • Use 'copy' module to propagate files - test
    • Use 'file' module to ensure file compliance
    • Use package management modules to control packages
    • Propagate privileged SSH access for elevation
    • Update target systems applications
    • Ensure the presence of specific packages
    • Fetch interesting content from managed nodes
    • Manage cron entries
    • Alter system variables with 'sysctl'
    • Ensure consistent user accounts on targets
    • Create common group
    • Ensure user membership in common group
    • Perform mass 'wget' operations across nodes
    • Ensure log file presence and attributes via 'file' module
    • Execute ad-hoc commands via 'shell' module
    • Contrast 'shell' and 'command' modules
  •  
  • Playbooks
    • Discuss features and applicability
    • Provision version controlled repo for playbooks
    • Define basic checks playboook for all nodes
    • Ensure the presence of targeted system files
    • Control SELinux status on applicable targets
    • Ensure system clocks are synched across nodes
    • Except NTP servers via play
    • Update and upgrade package repositories
    • Ensure web server package is deployed to targeted nodes
    • Ensure the presence of targeted user account on nodes
    • Discuss VARs as applied to playbooks
    • Create Inventory VARs
    • Update inventory to include geographic regions
    • Create Host-specific VARs
    • Test VAR interpolation per group | host | common
  •  
  • Facts
    • Discuss ascertainment and applicability
    • Use 'setup' module to ascertain various target Facts
    • Restructure Plays and Tasks using: 'when' condition
    • Test interpolation of new condition
    • Execute Playbook on specific targets using Facts
    • Create VAR-based dependency for conditional processing
    • Restructure time synch based on conditional testing
    • Handle NTP servers and clients separately
    • Discuss and expose nested VARs
    • Access key nested VARs
  •  
  • Templates
    • Discuss features and applicability
    • Model: /etc/hosts as a template
    • Test initial propagation to safe-space
    • Personalize hosts template per managed node
    • Debug unanticipated calamities
    • Test propagation to prod directory
  •  
  • Handlers
    • Discuss event facility
    • Fetch disparate, model Apache configs from nodes
    • Create 'webfarm' group to include targets
    • Create play update Apache configuration
    • Create Handler to reload Apache post-config update
    • Confirm functionality
  •  
  • Configuration Hierarchy
    • Discuss ideal structure
    • Restructure config files using Ansible model
    • Distinguish between 'staging' and 'production'
    • Include common and webtier specific attributes
    • Test targeted calls
    • Contrast with unstructured layout
    • Merge webtier handlers and files into new structure
  •  

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