deployment-workflows

Deployment Workflows Skill

Overview

This skill provides comprehensive deployment strategies including CI/CD pipelines, zero-downtime deployments, and infrastructure as code patterns for production-ready applications.

When to Use This Skill

• Setting up deployment pipelines
• Configuring production infrastructure
• Implementing zero-downtime deployments
• Disaster recovery procedures
• Monitoring and alerting setup

Pre-Deployment Checklist (Level 1 - Always Loaded)

🚀 Production Readiness Checklist

Before deploying to production:

• All tests passing (unit, integration, E2E)
• Test coverage ≥ 80%
• Security scan passed (no critical vulnerabilities)
• No hardcoded secrets
• Environment variables documented
• Database migrations tested
• Monitoring configured
• Logging implemented
• Error tracking setup (Sentry/equivalent)
• Rate limiting enabled
• HTTPS enforced
• Backup strategy defined
• Rollback plan documented
• Performance tested under load
• Documentation updated

Zero-Downtime Deployment Strategy

Blue-Green Deployment

# Deploy new version (green) alongside old version (blue)
# Switch traffic once green is verified healthy

steps:
  1. Deploy new version (green) to separate infrastructure
  2. Run smoke tests on green environment
  3. Switch 10% of traffic to green (canary)
  4. Monitor metrics for 10 minutes
  5. If metrics healthy, switch 100% traffic to green
  6. Keep blue running for 1 hour (quick rollback if needed)
  7. Decommission blue environment

Rolling Deployment

# Update instances one at a time

steps:
  1. Remove instance from load balancer
  2. Deploy new version to instance
  3. Run health checks
  4. Add instance back to load balancer
  5. Repeat for next instance
  6. Monitor error rates between updates

Database Migration Strategy

// Safe migration pattern (zero-downtime)

// Step 1: Add new column (deploy v1.1)
// Migration: Add column with nullable constraint
ALTER TABLE users ADD COLUMN email_verified BOOLEAN;

// Application code: Write to both old and new schema
async function updateUser(userId: string, data: any) {
  // Write to new column if provided
  if (data.emailVerified !== undefined) {
    await db.query(
      'UPDATE users SET email_verified = $1 WHERE id = $2',
      [data.emailVerified, userId]
    );
  }
}

// Step 2: Backfill data (background job)
async function backfillEmailVerified() {
  // Migrate existing data in batches
  await db.query(`
    UPDATE users
    SET email_verified = false
    WHERE email_verified IS NULL
  `);
}

// Step 3: Make column non-nullable (deploy v1.2)
ALTER TABLE users ALTER COLUMN email_verified SET NOT NULL;

// Step 4: Remove old code paths (deploy v1.3)