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HA/DR for Developers: Building Resilient Systems Without Losing Sleep
- High Availability (HA) and Disaster Recovery (DR) are crucial for building resilient systems that can tolerate failure without causing undue stress or interruptions in personal life.
- HA focuses on designing systems to minimize disruptions, while DR ensures quick recovery after a disruption occurs.
- Core principles of HA include architecting for continuity, using bulkheads to isolate failures, assuming failure in every part of the system, degrading instead of failing completely, and buying time to fix issues without causing panic.
- Disaster Recovery principles involve defining realistic Recovery Time Objective (RTO) and Recovery Point Objective (RPO) targets, automating recovery processes, regularly testing DR plans, keeping dependencies in mind, and documenting communication protocols.
- In Azure, HA/DR strategies range from Hot/Hot (both regions actively serving traffic) to Hot/Cold (one region active, the other defined but not deployed), each with varying recovery times and costs.
- The Active/Active topology involves two or more regions serving live traffic simultaneously, offering high resilience and efficiency, while Active/Passive has one region handling all traffic with another on standby.
- The recommended combination for optimal resilience and peace of mind is Active/Active with Hot/Hot, ensuring continuous validation and fast recovery with minimal guesswork.
- Objections to this setup being complex or expensive are countered by the benefits of distributed costs, manageable complexity, and adaptability of applications to modern architectures.
- Building a culture of shared responsibility for HA/DR, involving infrastructure, security, and business stakeholders, ensures a well-rounded approach to system resilience.
- Architecting for peace of mind involves designing systems that fail gracefully, recover fast, and allow developers to trust in the system's stability without sacrificing personal life.
- Testing recovery processes regularly, utilizing Azure-native features, and prioritizing personal peace of mind are key takeaways in ensuring resilient systems without losing sleep.
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