Infrastructure Automation with Puppet

What Will You Learn?

• 1. Automate System Configuration
• Use Puppet to automate tasks like installing packages, managing users, configuring files, and starting services.
• Manage infrastructure declaratively — define what you want, not how to do it.
• 2. Understand Puppet's Architecture
• Learn the master-agent model and agentless execution (via Puppet Bolt).
• Understand how nodes communicate securely with the Puppet master using SSL.
• 3. Write Puppet Manifests and Modules
• Write manifests using Puppet's DSL (Domain Specific Language).
• Use resources (file, package, service, user, etc.) to describe system state.
• Create reusable modules and organize them properly for large-scale environments.
• 4. Use Classes, Variables, and Templates
• Structure your code using classes and parameterized classes.
• Define and use variables effectively (top-scope, class-scope, facts).
• Use ERB templates to generate dynamic configuration files.
• 5. Manage Data with Hiera
• Separate data from logic using Hiera, Puppet’s key-value lookup tool.
• Use YAML to define environment- or node-specific configuration.
• Override values cleanly for different environments or roles.
• 6. Secure and Classify Systems
• Use node definitions and external node classifiers (ENCs) to apply the right configs to the right machines.
• Classify machines based on roles, hostnames, or environments.
• 7. Maintain Idempotency and Reusability
• Ensure that applying the same Puppet manifest repeatedly will produce the same result (idempotence).
• Write modular and reusable Puppet code using roles and profiles.
• 8. Deploy and Manage Applications at Scale
• Deploy multi-node environments (e.g., LAMP stack) using Puppet roles and modules.
• Manage server groups (web, DB, app) from a central Puppet master.
• 9. Test and Troubleshoot Puppet Code
• Use tools like puppet-lint, puppet parser validate, and dry runs (--noop) to catch errors.
• Debug and interpret Puppet logs and reports.
• Test modules with rspec-puppet (optional advanced).
• 10. Integrate Puppet with Version Control and GitOps
• Use r10k or Code Manager to manage environments and deploy code from Git repositories.
• Create development, test, and production environments using branches.
• 11. Use Puppet Bolt for Agentless Automation
• Learn how to run tasks and scripts without installing a Puppet agent.
• Write Bolt plans to coordinate multi-step operations across systems.
• 12. Monitor and Report Infrastructure State
• Get visibility into what changes were made, when, and by whom.
• Use PuppetDB to query node information and resource states.
• Generate compliance and audit reports (especially with Puppet Enterprise).
• By the End of the Course, You Will Be Able To:
• Automate the deployment and configuration of servers at scale.
• Manage complex infrastructure using reusable, tested, and modular code.
• Apply best practices for secure, reliable, and maintainable infrastructure as code (IaC).
• Use Puppet confidently in production environments or DevOps pipelines.