1. Detect Changes & Fetch [(Git)]
2. Build & Version [(npm, gradle)]
3. Unit Tests [(Junit, Jest, etc)]
4. Code Analysis - (optional)
5. Push to Prod

Jenkins Concepts

• Freestyle vs Pipeline: Freestyle build CD with UI / Pipeline builds with code (Groovy)
• Plugins: Extension tools, such as npm, pip, cargo, etc
• Tools: Plugins that are activated, (recommended: Auto Install)
• Job: Build task
• Triggers: Entry point to initialise build automatically, common ways:
  • Git Webhook // Poll SCM (Source Code Manager) - Interval Polling

Setup Docker CI/CD -> ECR -> ECS

CI - Docker to ECR

• Setup New EC2
• Install Docker & AWS CLI
• Add jenkins to docker group
• Create ECR - public & get URl
• Store AWS Creds (access & secret) in jenkins global creds

CD - ECR to ECS

• Build Cluster & Select Instances (use Fargate Serverless) + Insights
• Task config
  • build (1CPU, 2GB mem) - [ Container for ECS ]
  • add container from ECR URI here
• Create Service (allow HTTP - 80 & TCP - 8080) [LB 80 -> Cont. 8080]