Operations

Synopsis This chapter provides a practical checklist for multi-CDN programs. It maps objectives to design, security, origin, caching, telemetry, traffic steering, testing, rollout, and ongoing operations. Items are written to be auditable and printable. The aim is stable behavior, predictable costs, and clear ownership. Objectives and scope Document service objectives, success measures, and constraints. Define availability and latency targets per region. Record compliance and residency rules. Note content types, expected volumes, and seasonal peaks. Establish a decision owner for routing and for incidents. Record change control and rollback expectations. ...

Synopsis This chapter provides standard playbooks for incidents in multi-CDN environments. It covers detection, triage, scoping by geography and network, isolation and reroute choices, change control during active events, communication, restoration, and post-incident analysis. The objective is to protect users first, keep changes reversible, and leave an audit trail that improves future responses. Principles Incident handling favors user outcomes over internal metrics. Actions modify the smallest scope that achieves protection. All changes must be reversible. Each action records who acted, what changed, and why. Telemetry drives decisions and distinguishes symptoms from causes. Providers are treated as interchangeable routes unless a risk register documents exceptions. ...

Synopsis An origin that serves multiple CDNs must tolerate their combined fetch patterns and different failure behavior. Topology, shielding, authentication, cache keys, deployment order, and failover controls determine whether content remains correct when traffic moves. Role of the origin in multi-CDN The origin is the source of truth for content and APIs. In a multi-CDN setup more than one provider will fetch from it. The design must handle higher fan in, different retry behaviors, and different cache semantics without breaking correctness. It should also keep the number of variables low so that problems are diagnosable during incidents. ...

Synopsis Transport security across CDNs depends on a coordinated certificate lifecycle, subject names, revocation signals, transparency monitoring, and origin authentication. Automation must account for different session behavior and provider controls without creating a service gap during rotation. Scope and goals The transport layer must present a uniform and reliable interface regardless of which CDN serves a connection. Users should see correct certificates, modern protocol support, stable cipher policy, and predictable session behavior. Operations should see an automated lifecycle that avoids expirations, supports rapid revocation, and provides clear observability. The origin path should authenticate CDNs in a way that cannot be replayed from the public internet. ...