Blast radius
Blast radius is the scope of systems, components, data, users, or functionality that may be affected by a failure, change, or other disruptive event.
Infrastructure as Code, Patterns and Practices: With examples in Python and Terraform
The blast radius is the extent of system impact caused by a failed change, measured by the number or criticality of affected components.
- How it is used
- Uses blast radius to assess and limit infrastructure-change failures through IaC, modularization, testing, and staged rollout.
- How deep it goes
- Defines impact and develops practical containment patterns, but defers detailed testing and reverting procedures to other treatments.
- Examples
- Uses a miscopied switch command, small infrastructure modules, incremental fixes, rolling upgrades, and blue-green network deployment.
- What you can do after
- Diagnose and reduce change impact by isolating resources, testing dependencies, staging rollouts, and reconciling drift before retrying.
Google Anthos in Action
Blast radius is the scope of components, users, or functionality affected by a failure or operational change.
- How it is used
- Uses service decomposition to limit outage impact and isolate operational changes to independently deployed microservices.
- How deep it goes
- Defines outage scope and connects it to separate compilation and deployment, stopping short of a formal measurement method.
- Examples
- Uses payment and taxation services to show domain separation and single-microservice outage containment.
- What you can do after
- Apply it via microservice boundaries and independent deployment to reduce outage scope and scale services separately.
Troubleshooting Java, Second Edition
Blast radius is the scope of components, records, or systems affected by a failure or data problem.
- How it is used
- Scopes data problems during incident response to determine urgency and recovery extent.
- How deep it goes
- Explains isolated-versus-systemic impact and applies hash spot-checking, without detailing broader recovery procedures.
- Examples
- Uses corrupted database records, conflicting invoices, downstream systems, support databases, and hash comparisons.
- What you can do after
- Diagnose/debug with hash comparisons to distinguish isolated records from widespread data problems.
Read how Troubleshooting Java, Second Edition explains blast radius →
Platform Engineering on Kubernetes
Blast radius is the extent of systems, resources, or users that can be affected by a failure or security compromise.
- How it is used
- Uses service-to-service authorization to limit the impact of security breaches in distributed applications.
- How deep it goes
- Defines the metric and explains identity, allowed calls, protocols, ports, and external rule enforcement, without implementation details.
- Examples
- Uses Service A and Service B, unrestricted invocation, compromised services, and system-level interaction rules.
- What you can do after
- Apply service identities and interaction rules to restrict calls and reduce the services affected by a compromise.
Read how Platform Engineering on Kubernetes explains blast radius →
Related concepts
- canary deploymentaddressed by · A canary deployment is a release strategy that exposes a change to a limited portion of users, traffic, or infrastructure before expanding it more broadly.
- rolling updateaddressed by · A rolling update is a deployment or upgrade technique that updates or replaces instances or resources incrementally rather than all at once, allowing the rest of the system to continue operating during the change.
- isolationaddressed by · Isolation is the separation of components, processes, resources, or contexts to limit interaction, interference, or the propagation of effects between them.
- couplingused by · Coupling is the degree of dependency between software components, including how their behavior, availability, or changes affect one another.
- sandboxingaddressed by · Sandboxing is the isolation of software execution in a restricted environment that limits its access to resources and its effects on surrounding systems.
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