L16. Cost Management: Cloud Billing, Budgets, and Committed Use Discounts
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Managing Google Cloud costs involves understanding billing structure, discount types, and optimization tools. The Digital Leader exam tests Cloud Billing, budgets, CUDs, sustained use discounts, and the Pricing Calculator.
Google Cloud Billing Structure
Billing account: a resource that tracks charges and payment for Google Cloud projects. One billing account can be linked to multiple projects. Invoicing: Google Cloud uses a monthly invoice or automatic payment cycle. Pricing principles:- No upfront costs
- Pay only for what you use
- Discounts for sustained and committed use
- Free tier: 90+ products with always-free tiers (Cloud Functions 2M invocations/month, Cloud Storage 5GB, BigQuery 1TB queries/month)
Sustained Use Discounts (SUDs)
Sustained use discounts are automatic discounts applied when Compute Engine resources run for more than 25% of a month. How they work:
- 25% of the month: 0% discount
- 50% of the month: up to 10% discount
- 75% of the month: up to 20% discount
- 100% of the month: up to 30% discount
Committed Use Discounts (CUDs)
Committed Use Discounts provide deeper savings in exchange for committing to a specific amount of usage for 1 or 3 years. Types:
- Resource-based CUDs: commit to specific machine types in a specific region; up to 57% savings
- Spend-based CUDs: commit to a minimum spend per hour for Cloud SQL or VMware Engine; up to 70% savings
Google Cloud Pricing Calculator
The Google Cloud Pricing Calculator (cloud.google.com/products/calculator) estimates monthly costs for Google Cloud services. Use when: sizing new projects, estimating migration costs, comparing configuration options.
Cloud Billing Budget and Alerts
Set a budget in the Google Cloud Billing console to receive email or Pub/Sub alerts when spending reaches defined thresholds. Budget alert thresholds: 50%, 90%, and 100% of budget (customizable). Budget actions: connect budgets to Pub/Sub to trigger Cloud Functions that can automatically disable billing or take other actions when thresholds are breached.
Cost Optimization Best Practices
- Right-size VMs: use Cloud Monitoring to identify underutilized instances
- Use preemptible/Spot VMs: for fault-tolerant batch workloads
- Apply CUDs: for sustained production workloads
- Use storage lifecycle rules: auto-transition Cloud Storage objects to cheaper classes
- Delete unused resources: idle disks, unused IP addresses, orphaned snapshots
- Label everything: use labels to attribute costs to teams and projects
| Feature | Savings | Requires Commitment |
|---|---|---|
| Sustained Use Discount | Up to 30% | No (automatic) |
| Committed Use Discount | Up to 57-70% | Yes (1 or 3 years) |
| Preemptible/Spot VMs | Up to 91% | No (interruptible) |
- ✓Sustained Use Discounts are automatic: Compute Engine resources running 100% of the month get up to 30% off
- ✓Committed Use Discounts require a 1 or 3-year commitment for deeper savings (up to 57-70%)
- ✓Preemptible/Spot VMs offer up to 91% discount but can be interrupted by Google at any time
- ✓Cloud Billing Budget and Alerts notify you via email or Pub/Sub when spending reaches thresholds
- ✓Google Cloud Pricing Calculator estimates monthly costs before deploying resources
1. A company runs Compute Engine VMs 24/7 in production. Which discount type automatically applies without any commitment required?
2. A company wants to maximize savings on their production database workloads running on Cloud SQL, which they plan to use continuously for 3 years. Which pricing option provides the deepest discount?
Recommended: Pluralsight
Reinforce these lessons with Pluralsight's Google Cloud paths: structured video courses, GCP console labs, and practice exams for the Digital Leader certification.