Config

Lessons

1. Configuring an Application with application.yml Learn how to structure application.yml with YAML mappings, lists, environments, secrets, validation, configuration loading, and troubleshooting.
2. Configuring Applications with application.properties Learn how to configure a Spring Boot application with application.properties, including syntax, profiles, property binding, overrides, secrets, and troubleshooting.
3. Configuring Rails Applications with database.yml Learn how Rails uses config/database.yml to configure adapters, environments, credentials, DATABASE_URL, connection pools, migrations, production security, and troubleshooting.
4. Jenkins Configuration: Understanding jenkins.conf and Service Settings Learn how to locate and safely manage Jenkins service settings, jenkins.conf, systemd overrides, JENKINS_HOME, JVM options, ports, reverse proxies, and Configuration as Code.
5. Master Key: Key Hierarchies, Secure Storage, and Lifecycle Management Learn what a cryptographic master key is, how key hierarchies and envelope encryption work, and how to store, rotate, recover, and protect master keys.
6. Rails Encrypted Credentials: config/credentials.yml.enc Learn how Rails encrypted credentials work, how to edit and access them, how master keys are deployed, and how to protect, rotate, and troubleshoot application secrets.