Four Levels of High Availability in Cloud Foundry

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" summary

Cloud Foundry exposes four concrete HA layers: availability zones evenly spread DEA instances so app instances survive an AZ failure; an elastic runtime health manager compares DEA heartbeats (actual state) to Cloud Controller’s desired state and triggers replacement app instances while the router auto-updates; BOSH monitors runtime processes and restarts them locally; BOSH agent heartbeats feed a health monitor that pages and invokes a resurrector via BOSH Director/CPI to recreate VMs when nodes die.

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