LinuxCBT CM-Ans Edition

English | mp4 | H264 1280x720 | AAC 2 ch | 8 hrs 5 min | 1.44 GB

eLearning

Course Objective

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