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<ol class="chapter"><li class="chapter-item expanded "><a href="project-context-primer.html"><strong aria-hidden="true">1.</strong> Project Context Primer</a></li><li class="chapter-item expanded "><a href="what-you-will-learn.html"><strong aria-hidden="true">2.</strong> What You Will Learn</a></li><li class="chapter-item expanded "><a href="quickstart.html"><strong aria-hidden="true">3.</strong> Quickstart</a></li><li class="chapter-item expanded "><a href="part-i.html"><strong aria-hidden="true">4.</strong> Part I — Foundations</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="introduction.html"><strong aria-hidden="true">4.1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="architecture-overview.html"><strong aria-hidden="true">4.2.</strong> Architecture Overview</a></li><li class="chapter-item expanded "><a href="testing-philosophy.html"><strong aria-hidden="true">4.3.</strong> Testing Philosophy</a></li><li class="chapter-item 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class="active"><strong aria-hidden="true">5.12.</strong> Runners</a></li><li class="chapter-item expanded "><a href="node-control.html"><strong aria-hidden="true">5.13.</strong> RunContext: BlockFeed & Node Control</a></li><li class="chapter-item expanded "><a href="chaos.html"><strong aria-hidden="true">5.14.</strong> Chaos Workloads</a></li><li class="chapter-item expanded "><a href="topology-chaos.html"><strong aria-hidden="true">5.15.</strong> Topology & Chaos Patterns</a></li></ol></li><li class="chapter-item expanded "><a href="part-iii.html"><strong aria-hidden="true">6.</strong> Part III — Developer Reference</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="scenario-model.html"><strong aria-hidden="true">6.1.</strong> Scenario Model (Developer Level)</a></li><li class="chapter-item expanded "><a href="api-levels.html"><strong aria-hidden="true">6.2.</strong> API Levels: Builder DSL vs. Direct</a></li><li class="chapter-item expanded "><a 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href="glossary.html"><strong aria-hidden="true">8.4.</strong> Glossary</a></li></ol></li></ol>
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<main>
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<h1 id="runners"><a class="header" href="#runners">Runners</a></h1>
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<p>Runners turn a scenario plan into a live environment while keeping the plan
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unchanged. Choose based on feedback speed, reproducibility, and fidelity. For
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environment and operational considerations, see <a href="operations-overview.html">Operations Overview</a>.</p>
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<p><strong>Important:</strong> All runners require <code>POL_PROOF_DEV_MODE=true</code> to avoid expensive Groth16 proof generation that causes timeouts.</p>
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<h2 id="host-runner-local-processes"><a class="header" href="#host-runner-local-processes">Host runner (local processes)</a></h2>
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<ul>
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<li>Launches node processes directly on the host (via <code>LocalDeployer</code>).</li>
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<li>Binary: <code>local_runner.rs</code>, script mode: <code>host</code></li>
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<li>Fastest feedback loop and minimal orchestration overhead.</li>
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<li>Best for development-time iteration and debugging.</li>
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<li><strong>Can run in CI</strong> for fast smoke tests.</li>
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<li><strong>Node control:</strong> Not supported (chaos workloads not available)</li>
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</ul>
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<p><strong>Run with:</strong> <code>scripts/run/run-examples.sh -t 60 -v 1 -e 1 host</code></p>
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<h2 id="docker-compose-runner"><a class="header" href="#docker-compose-runner">Docker Compose runner</a></h2>
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<ul>
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<li>Starts nodes in containers to provide a reproducible multi-node stack on a
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single machine (via <code>ComposeDeployer</code>).</li>
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<li>Binary: <code>compose_runner.rs</code>, script mode: <code>compose</code></li>
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<li>Discovers service ports and wires observability for convenient inspection.</li>
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<li>Good balance between fidelity and ease of setup.</li>
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<li><strong>Recommended for CI pipelines</strong> (isolated environment, reproducible).</li>
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<li><strong>Node control:</strong> Supported (can restart nodes for chaos testing)</li>
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</ul>
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<p><strong>Run with:</strong> <code>scripts/run/run-examples.sh -t 60 -v 1 -e 1 compose</code></p>
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<h2 id="kubernetes-runner"><a class="header" href="#kubernetes-runner">Kubernetes runner</a></h2>
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<ul>
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<li>Deploys nodes onto a cluster for higher-fidelity, longer-running scenarios (via <code>K8sDeployer</code>).</li>
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<li>Binary: <code>k8s_runner.rs</code>, script mode: <code>k8s</code></li>
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<li>Suits CI with cluster access or shared test environments where cluster behavior
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and scheduling matter.</li>
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<li><strong>Node control:</strong> Not supported yet (chaos workloads not available)</li>
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</ul>
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<p><strong>Run with:</strong> <code>scripts/run/run-examples.sh -t 60 -v 1 -e 1 k8s</code></p>
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<h3 id="common-expectations"><a class="header" href="#common-expectations">Common expectations</a></h3>
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<ul>
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<li>All runners require at least one validator and, for transaction scenarios,
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access to seeded wallets.</li>
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<li>Readiness probes gate workload start so traffic begins only after nodes are
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reachable.</li>
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<li>Environment flags can relax timeouts or increase tracing when diagnostics are
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needed.</li>
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</ul>
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<h2 id="runner-comparison"><a class="header" href="#runner-comparison">Runner Comparison</a></h2>
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<pre><code class="language-mermaid">flowchart TB
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subgraph Host["Host Runner (Local)"]
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H1["Speed: Fast"]
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H2["Isolation: Shared host"]
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H3["Setup: Minimal"]
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H4["Chaos: Not supported"]
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H5["CI: Quick smoke tests"]
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end
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subgraph Compose["Compose Runner (Docker)"]
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C1["Speed: Medium"]
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C2["Isolation: Containerized"]
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C3["Setup: Image build required"]
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C4["Chaos: Supported"]
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C5["CI: Recommended"]
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end
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subgraph K8s["K8s Runner (Cluster)"]
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K1["Speed: Slower"]
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K2["Isolation: Pod-level"]
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K3["Setup: Cluster + image"]
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K4["Chaos: Not yet supported"]
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K5["CI: Large-scale tests"]
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end
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Decision{Choose Based On}
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Decision -->|Fast iteration| Host
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Decision -->|Reproducibility| Compose
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Decision -->|Production-like| K8s
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style Host fill:#e1f5ff
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style Compose fill:#e1ffe1
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style K8s fill:#ffe1f5
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</code></pre>
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<h2 id="detailed-feature-matrix"><a class="header" href="#detailed-feature-matrix">Detailed Feature Matrix</a></h2>
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<div class="table-wrapper"><table><thead><tr><th>Feature</th><th>Host</th><th>Compose</th><th>K8s</th></tr></thead><tbody>
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<tr><td><strong>Speed</strong></td><td>Fastest</td><td>Medium</td><td>Slowest</td></tr>
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<tr><td><strong>Setup Time</strong></td><td>< 1 min</td><td>2-5 min</td><td>5-10 min</td></tr>
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<tr><td><strong>Isolation</strong></td><td>Process-level</td><td>Container</td><td>Pod + namespace</td></tr>
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<tr><td><strong>Node Control</strong></td><td>No</td><td>Yes</td><td>Not yet</td></tr>
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<tr><td><strong>Observability</strong></td><td>Basic</td><td>External stack</td><td>Cluster-wide</td></tr>
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<tr><td><strong>CI Integration</strong></td><td>Smoke tests</td><td>Recommended</td><td>Heavy tests</td></tr>
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<tr><td><strong>Resource Usage</strong></td><td>Low</td><td>Medium</td><td>High</td></tr>
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<tr><td><strong>Reproducibility</strong></td><td>Environment-dependent</td><td>High</td><td>Highest</td></tr>
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<tr><td><strong>Network Fidelity</strong></td><td>Localhost only</td><td>Virtual network</td><td>Real cluster</td></tr>
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<tr><td><strong>Parallel Runs</strong></td><td>Port conflicts</td><td>Isolated</td><td>Namespace isolation</td></tr>
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</tbody></table>
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</div>
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<h2 id="decision-guide"><a class="header" href="#decision-guide">Decision Guide</a></h2>
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<pre><code class="language-mermaid">flowchart TD
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Start[Need to run tests?] --> Q1{Local development?}
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Q1 -->|Yes| Q2{Testing chaos?}
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Q1 -->|No| Q5{Have cluster access?}
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Q2 -->|Yes| UseCompose[Use Compose]
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Q2 -->|No| Q3{Need isolation?}
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Q3 -->|Yes| UseCompose
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Q3 -->|No| UseHost[Use Host]
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Q5 -->|Yes| Q6{Large topology?}
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Q5 -->|No| Q7{CI pipeline?}
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Q6 -->|Yes| UseK8s[Use K8s]
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Q6 -->|No| UseCompose
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Q7 -->|Yes| Q8{Docker available?}
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Q7 -->|No| UseHost
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Q8 -->|Yes| UseCompose
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Q8 -->|No| UseHost
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style UseHost fill:#e1f5ff
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style UseCompose fill:#e1ffe1
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style UseK8s fill:#ffe1f5
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</code></pre>
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<h3 id="quick-recommendations"><a class="header" href="#quick-recommendations">Quick Recommendations</a></h3>
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<p><strong>Use Host Runner when:</strong></p>
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<ul>
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<li>Iterating rapidly during development</li>
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<li>Running quick smoke tests</li>
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<li>Testing on a laptop with limited resources</li>
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<li>Don't need chaos testing</li>
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</ul>
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<p><strong>Use Compose Runner when:</strong></p>
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<ul>
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<li>Need reproducible test environments</li>
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<li>Testing chaos scenarios (node restarts)</li>
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<li>Running in CI pipelines</li>
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<li>Want containerized isolation</li>
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</ul>
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<p><strong>Use K8s Runner when:</strong></p>
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<ul>
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<li>Testing large-scale topologies (10+ nodes)</li>
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<li>Need production-like environment</li>
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<li>Have cluster access in CI</li>
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