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Et si ca tourne mal ? Recettes pour des applications résilientes

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And if it goes wrong? Recipes for reliable apps, learned while scuba diving Christopher MANEU Startups Cloud Advocate @ Microsoft @cmaneu

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@cmaneu

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@cmaneu Technical deep diver (trimix, rebreather, >60m / 200 feet) Technical instructor Solo diving instructor

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@cmaneu Scuba diving is a safe sport

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@cmaneu What is reliability? Recipes for reliable apps Reliable application are designed to recover gracefully from failures and run in a healthy state with no significant downtime.

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@cmaneu Agenda Recipes for reliable apps #1 Before your dive #2 Go diving #3 Back to the shore

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@cmaneu Agenda Recipes for reliable apps #2 Go diving #3 Back to the shore #1 Before your dive

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@cmaneu Planning for bad things Before your dive | Recipes for reliable apps We are even dumber deep dive under than at the surface. “ “

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@cmaneu What-if technique Before your dive | Recipes for reliable apps Do these steps as a team: 1. Identify dangers 2. Evaluate risks 3. Prepare a contingency plan 4. Repeat What if… Then Lost mask Backup mask in pocket Leak on air tank during transport Recompute my limits, reduce dive Leak on main gaz source underwater Switch to redundant gaz supply, close faulty gaz tank.

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From What-If to Failure Mode Analysis Before your dive | Recipes for reliable apps https://aka.ms/cloudnord-scuba

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@cmaneu Check-lists Before your dive | Recipes for reliable apps

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Resiliency checklist Before your dive | Recipes for reliable apps https://aka.ms/cloudnord-scuba

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@cmaneu Pinnacle dive Before your dive | Recipes for reliable apps A dive that’s a peak dive for its participants… perhaps the deepest, most complex, longest, and toughest in their logbook.

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@cmaneu Always diving in your level Before your dive | Recipes for reliable apps • Experience • Depth • Duration • Decompression limits • … • Change maximum one parameter / dive

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Before your dive | Recipes for reliable apps Usage patterns Availability metrics Recovery metrics Availability targets MTTR MTBF RTO RPO SLA SLI SLO https://aka.ms/cloudnord-scuba

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Before your dive | Recipes for reliable apps Cost + complexity Availability Video delivery, broadcast systems ATM transactions, telecommunications systems Batch processing, data extraction, transfer, and load jobs Internal tools like knowledge management, project tracking Online commerce, point of sale 99% 99.9% 99.95% 99.99% 99.999%

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@cmaneu Agenda Recipes for reliable apps #1 Before your dive #2 Go diving #3 Back to the shore

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@cmaneu Streamline your configuration Go diving | Recipes for reliable apps

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@cmaneu Streamline your configuration Go diving | Recipes for reliable apps

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@cmaneu Streamline your configuration Go diving | Recipes for reliable apps

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Is your architecture streamlined? Go diving | Recipes for reliable apps I Run Kubernetes, I have no issues! https://k8s.af/

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@cmaneu When things go wrong, a priority framework Go diving | Recipes for reliable apps #1 Breathe #2 Buoyancy #3 Ascent

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A priority framework Go diving | Recipes for reliable apps T D O D A R ime (it’s also team) iagnostics ptions ecide ct / assign eview

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Brownout strategies Go diving | Recipes for reliable apps Which part/features of your application you can disable during an emergency?

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Brownout strategies: a real-world example Go diving | Recipes for reliable apps

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@cmaneu Agenda Recipes for reliable apps #1 Before your dive #2 Go diving #3 Back to the shore

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@cmaneu We need to talk… Back to the shore | Recipes for reliable apps You know it was a bad dive when no ones talk on the boat “ “

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Postmortem Back to the shore | Recipes for reliable apps Never charge team members What needs to be said must be said Can use different angles to help postmortem - Technical - Technological - Psychological

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Improve: Fail-over checklist Back to the shore | Recipes for reliable apps https://aka.ms/cloudnord-scuba

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@cmaneu Agenda Recipes for reliable apps #1 Prepare your dive #2 Go diving #3 Back to the shore

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@cmaneu Agenda Recipes for reliable apps #1 Prepare your dive #2 Go diving #3 Back to the shore What-If Checklists Limits Streamlined configuration Priority framework Brownout strategy Debrief Improve

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Architecture Review Cost, DevOps, Scalability, Resiliency, and Security. https://aka.ms/cloudnord-scuba

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@cmaneu 4 characteristics of a good tech diver Recipes for reliable apps Humility Doesn’t know everything, know that there is more than one good solution. Openness Doesn’t fear change, don’t reject new or different ideas on the spot Analytical Doesn’t accept things because they’re just new. Evaluate with neutrality and realistic POV. Competency Never stop learning

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@cmaneu

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https://unsplash.com/photos/raalZ zjZUXQ Photo by Jeremy Bishop on Unsplash Photo by Denes Kozma on Unsplash

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Thanks Christopher MANEU Startups Cloud Advocate @ Microsoft @cmaneu Recipes for reliable apps, learned while scuba diving https://aka.ms/chris/slides