# CI/CD Pipeline Specification

## Overview

Continuous Integration and Continuous Deployment pipeline.

## Build Pipeline

### Stages

1. **Source**: Code checkout
2. **Build**: Compile/build application
3. **Test**: Run tests
4. **Package**: Create container images
5. **Deploy**: Deploy to environment

### Tools

**CI/CD Platform**: GitHub Actions, GitLab CI, or Jenkins

**Build**: Docker build
**Registry**: Container registry (Docker Hub, ECR, GCR)

## Test Strategy

### Test Types

**Unit Tests**: Component-level tests
**Integration Tests**: Service integration tests
**E2E Tests**: End-to-end user flow tests

### Test Execution

- Run on every commit
- Block deployment on test failures
- Parallel test execution

## Deployment Strategies

### Blue-Green Deployment

**Method**: Deploy new version alongside old, switch traffic
**Benefits**: Zero downtime, instant rollback
**Use Case**: Production deployments

### Canary Deployment

**Method**: Gradually roll out new version to subset of users
**Benefits**: Risk mitigation, gradual rollout
**Use Case**: Major updates

## Rollback Procedures

### Automatic Rollback

**Triggers**:
- Health check failures
- Error rate spike
- Performance degradation

### Manual Rollback

**Process**:
1. Identify issue
2. Rollback to previous version
3. Verify rollback success
4. Investigate issue

## References

- Infrastructure: See `infrastructure.md`
- Deployment: See `disaster-recovery.md`