# Deployment Automation Guide

**Date**: 2025-01-27
**Purpose**: Guide for automating deployments across projects
**Status**: Complete

---

## Overview

This guide provides strategies and tools for automating deployments across the integrated workspace.

---

## Deployment Strategies

### 1. Blue-Green Deployment

**Strategy**: Deploy new version alongside old, switch traffic

**Benefits**:
- Zero downtime
- Easy rollback
- Safe testing

**Implementation**:
```bash
# Deploy green environment
kubectl apply -f deployment-green.yaml

# Test green environment
curl https://green.example.com/health

# Switch traffic
kubectl patch service app -p '{"spec":{"selector":{"version":"green"}}}'

# Keep blue for rollback
```

### 2. Canary Deployment

**Strategy**: Gradual rollout to subset of users

**Benefits**:
- Risk mitigation
- Gradual validation
- Easy rollback

**Implementation**:
```yaml
# Deploy canary (10% traffic)
apiVersion: v1
kind: Service
metadata:
  name: app
spec:
  selector:
    app: app
    version: canary
  ports:
    - port: 80
```

### 3. Rolling Deployment

**Strategy**: Incremental replacement of instances

**Benefits**:
- No downtime
- Resource efficient
- Standard Kubernetes

**Implementation**:
```yaml
spec:
  replicas: 3
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
```

---

## GitOps Workflows

### ArgoCD

**Setup**:
```bash
# Install ArgoCD
kubectl create namespace argocd
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
```

**Application**:
```yaml
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: dbis-core
spec:
  project: default
  source:
    repoURL: https://github.com/org/repo
    path: dbis_core/k8s
    targetRevision: main
  destination:
    server: https://kubernetes.default.svc
    namespace: dbis-core
  syncPolicy:
    automated:
      prune: true
      selfHeal: true
```

### Flux

**Setup**:
```bash
# Install Flux
flux install

# Create GitRepository
flux create source git dbis-core \
  --url=https://github.com/org/repo \
  --branch=main

# Create Kustomization
flux create kustomization dbis-core \
  --source=dbis-core \
  --path="./dbis_core/k8s" \
  --prune=true
```

---

## CI/CD Integration

### GitHub Actions

```yaml
name: Deploy

on:
  push:
    branches: [main]

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Build
        run: pnpm build

      - name: Deploy to Kubernetes
        run: |
          kubectl set image deployment/app \
            app=registry.example.com/app:${{ github.sha }}
```

### GitLab CI/CD

```yaml
deploy:
  stage: deploy
  script:
    - kubectl set image deployment/app \
        app=registry.gitlab.com/group/project:$CI_COMMIT_SHA
  only:
    - main
```

---

## Infrastructure as Code

### Terraform Deployment

```bash
# Plan
terraform plan -out=tfplan

# Apply
terraform apply tfplan

# Destroy (if needed)
terraform destroy
```

### Ansible Deployment

```yaml
- name: Deploy application
  hosts: app_servers
  tasks:
    - name: Pull latest image
      docker_container:
        name: app
        image: registry.example.com/app:latest
        state: started
```

---

## Monitoring Deployments

### Health Checks

```yaml
livenessProbe:
  httpGet:
    path: /health
    port: 8080
  initialDelaySeconds: 30
  periodSeconds: 10

readinessProbe:
  httpGet:
    path: /ready
    port: 8080
  initialDelaySeconds: 5
  periodSeconds: 5
```

### Deployment Status

```bash
# Check deployment status
kubectl rollout status deployment/app

# View deployment history
kubectl rollout history deployment/app

# Rollback if needed
kubectl rollout undo deployment/app
```

---

## Best Practices

### Pre-Deployment
- Run all tests
- Security scanning
- Dependency audit
- Documentation update

### During Deployment
- Monitor metrics
- Check logs
- Verify health
- Test functionality

### Post-Deployment
- Monitor for issues
- Verify metrics
- Check alerts
- Update status page

---

**Last Updated**: 2025-01-27