Google Cloud Well-Architected Framework skill for the Reliability pillar

Overview

The Reliability pillar of the Google Cloud Well-Architected Framework provides principles and recommendations to help you design, deploy, and manage reliable, resilient, and highly available workloads in Google Cloud. A reliable system consistently performs its intended functions under defined conditions, is resilient to failures, and recovers gracefully from disruptions, thereby minimizing downtime, enhancing user experience, and ensuring data integrity.

Core principles

The recommendations in the reliability pillar of the Well-Architected Framework are aligned with the following core principles:

Define reliability based on user-experience goals: Measurement of reliability should reflect the actual experience of the system's users rather than merely relying on infrastructure metrics. Focus on outcomes that matter most to users. Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/define-reliability-based-on-user-experience-goals
Set realistic targets for reliability: Determine appropriate Service Level Objectives (SLOs) that balance the cost and complexity of maximizing availability against business requirements. Utilize error budgets to manage feature velocity. Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/set-targets
Build highly available systems through resource redundancy: Eliminate single points of failure by duplicating critical components across zones and regions to maintain operations during localized outages. Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/build-highly-available-systems
Take advantage of horizontal scalability: Design system architectures to scale horizontally (adding more instances) to seamlessly accommodate load fluctuations and improve overall fault tolerance. Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/horizontal-scalability
Detect potential failures by using observability: Implement thorough monitoring, logging, and alerting systems to proactively detect, diagnose, and address anomalies before they cause user-facing issues. Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/observability
Design for graceful degradation: Architect systems to maintain critical functionality, even if at reduced performance or with limited features, when dependencies fail or the system experiences extreme stress. Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/graceful-degradation
Perform testing for recovery from failures: Build confidence in system resilience by continuously simulating failures and verifying the effectiveness of automated and manual recovery procedures. Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/perform-testing-for-recovery-from-failures
Perform testing for recovery from data loss: Regularly test backup and restore protocols to ensure rapid recovery from data corruption or loss, remaining within the defined Recovery Time Objective (RTO) and Recovery Point Objective (RPO). Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/perform-testing-for-recovery-from-data-loss
Conduct thorough postmortems: Foster a blameless culture by investigating outages comprehensively to understand root causes, followed by implementing measures that prevent recurrence. Grounding document: https://docs.cloud.google.com/architecture/framework/reliability/conduct-postmortems

Relevant Google Cloud products

The following are examples of Google Cloud products and features that are relevant to reliability:

Compute: Compute Engine Managed Instance Groups (MIGs), Google Kubernetes Engine (GKE), Cloud Run
Networking: Cloud Load Balancing, Cloud CDN, Cloud DNS
Storage and databases: Cloud Storage (multi-region), Cloud SQL High Availability, Spanner, Filestore, Firestore
Operations: Cloud Monitoring, Cloud Logging, Google Cloud Managed Service for Prometheus
Disaster recovery: Backup and DR Service, Filestore backups

Workload assessment questions

Ask appropriate questions to understand the reliability-related requirements and constraints of the workload and the user's organization. Choose questions from the following list:

How does your organization define and measure the reliability of your systems in relation to user experience?
How does your organization approach setting reliability targets for your services?
What is your organization's strategy for ensuring high availability through resource redundancy?
How does your organization leverage horizontal scalability to maintain performance and reliability?
How does your organization utilize observability (metrics, logs, traces) to gain insights and detect potential failures?
How does your organization manage alerting based on observability data to ensure timely responses to significant issues without causing alert fatigue?
What measures does your organization take to ensure systems can gracefully degrade during high load or partial failures?
How frequently and comprehensively does your organization test for recovery from system failures (e.g., regional failovers, release rollbacks)?
What is your organization's approach to testing for recovery from data loss?
How does your organization conduct and utilize postmortems after incidents?

Validation checklist

Use the following checklist to evaluate the architecture's alignment with reliability recommendations: