In many cases, we want our applications to scale horizontally. Building more nodes allows us to serve more customers. This will be a complete rewrite of the previous application, also incorporating puppetlabs/app_modeling from the Forge.
Adding a load balancer and providing horizontal scaling
by Jason Southgate, Ryan Russell-Yates
Mastering Puppet 5
- Title Page
- Copyright and Credits
- Dedication
- Packt Upsell
- Contributors
- Preface
- Authoring Modules
- Using a decent IDE and plugins
- Using good module and class structure
- Using the new Puppet Development Kit commands
- Validating your module
- Unit testing your module
- Staying on the lookout for code smells
- Working with dead code
- Using Puppet Forge
- Working with the community
- Writing great documentation
- Adding module dependencies
- Adding compatibility data for your modules
- Using the new Hiera 5 module level data
- Summary
- Roles and Profiles
- Summary of the pattern
- Profiles
- Profiles best practices summary
- Designing for use of the include keyword
- Using subdirectories for sensible, readable profile class groups
- Hiding complexity with parameters, defaults, and abstraction
- Deciding how to set the parameters for component classes
- Deciding to use either automatic class parameter lookup or the lookup function
- Profiles best practices summary
- Roles
- Summary
- Extending Puppet
- Custom facts
- Custom functions
- Types and providers
- Types
- Creating and distributing the type
- Adding the namevar special attribute
- Adding additional type properties
- Adding the optional ensure property
- Adding type parameters
- Setting property and parameter defaults
- Checking the input value with a validate block
- Checking the input value against a newvalues array
- Checking datatype compatibility with munge
- Using autorequire for implicit relationships
- Using arrays to assign a list of values to an attribute
- Using the desc method to add inline documentation
- Providers
- Types
- Summary
- Hiera 5
- Separation of concerns between code and data
- Introducing a frame for the environment
- A more complete hierarchy
- Hiera 5 summary
- Global, environment, and module layers
- Encrypted YAML backend
- Lookup function
- Debugging Hiera
- Beyond Hiera using Jerakia
- Jerakia advanced use cases
- Installing Jerakia
- Configuring Jerakia
- Creating your default Jerakia policy
- Using Vault as an encryption backend
- Installing and configuring Vault
- Unsealing Vault
- Enabling the transit backend
- Creating an encryption key
- Creating a policy for encrypting and decrypting
- Checking the encryption is working correctly
- Allowing Jerakia to authenticate with our Vault
- Configuring Jerakia for encryption
- Encryption-enabling our Jerakia lookups
- Jerakia advanced use cases
- Summary
- Managing Code
- Workflow
- Continuous Integration
- Extending Puppet with Tasks and Discovery
- Exported Resources
- Application Orchestration
- Scaling Puppet
- Troubleshooting and Profiling
- Other Books You May Enjoy
Adding a load balancer and providing horizontal scaling
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