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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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<h1 id="running-scenarios"><a class="header" href="#running-scenarios">Running Scenarios</a></h1>
<p>This page focuses on how scenarios are executed (deploy → run → evaluate → cleanup), what artifacts you get back, and how that differs across runners.</p>
<p>For “just run something that works” commands, see <a href="running-examples.html">Running Examples</a>.</p>
<hr />
<h2 id="execution-flow-high-level"><a class="header" href="#execution-flow-high-level">Execution Flow (High Level)</a></h2>
<p>When you run a built scenario via a deployer, the run follows the same shape:</p>
<pre><code class="language-mermaid">flowchart TD
Build[Scenario built] --&gt; Deploy[Deploy]
Deploy --&gt; Capture[Capture]
Capture --&gt; Execute[Execute]
Execute --&gt; Evaluate[Evaluate]
Evaluate --&gt; Cleanup[Cleanup]
</code></pre>
<ul>
<li><strong>Deploy</strong>: provision infrastructure and start nodes (processes/containers/pods)</li>
<li><strong>Capture</strong>: establish clients/observability and capture initial state</li>
<li><strong>Execute</strong>: run workloads for the configured wall-clock duration</li>
<li><strong>Evaluate</strong>: run expectations (after the execution window ends)</li>
<li><strong>Cleanup</strong>: stop resources and finalize artifacts</li>
</ul>
<hr />
<h2 id="the-core-api"><a class="header" href="#the-core-api">The Core API</a></h2>
<pre><code class="language-rust ignore">use std::time::Duration;
use testing_framework_core::scenario::{Deployer as _, ScenarioBuilder};
use testing_framework_runner_local::LocalDeployer;
use testing_framework_workflows::ScenarioBuilderExt;
async fn run_once() -&gt; anyhow::Result&lt;()&gt; {
let mut scenario = ScenarioBuilder::topology_with(|t| t.network_star().validators(3).executors(1))
.wallets(20)
.transactions_with(|tx| tx.rate(1).users(5))
.expect_consensus_liveness()
.with_run_duration(Duration::from_secs(60))
.build()?;
let runner = LocalDeployer::default().deploy(&amp;scenario).await?;
runner.run(&amp;mut scenario).await?;
Ok(())
}</code></pre>
<p>Notes:</p>
<ul>
<li><code>with_run_duration(...)</code> is wall-clock time, not “number of blocks”.</li>
<li><code>.transactions_with(...)</code> rates are per-block.</li>
<li>Most users should run scenarios via <code>scripts/run/run-examples.sh</code> unless they are embedding the framework in their own test crate.</li>
</ul>
<hr />
<h2 id="runner-differences"><a class="header" href="#runner-differences">Runner Differences</a></h2>
<h3 id="local-host-runner"><a class="header" href="#local-host-runner">Local (Host) Runner</a></h3>
<ul>
<li><strong>Best for</strong>: fast iteration and debugging</li>
<li><strong>Logs/state</strong>: stored under a temporary run directory unless you set <code>NOMOS_TESTS_KEEP_LOGS=1</code> and/or <code>NOMOS_LOG_DIR=...</code></li>
<li><strong>Limitations</strong>: no node-control capability (chaos workflows that require node control wont work here)</li>
</ul>
<p>Run the built-in local examples:</p>
<pre><code class="language-bash">POL_PROOF_DEV_MODE=true \
scripts/run/run-examples.sh -t 60 -v 3 -e 1 host
</code></pre>
<h3 id="compose-runner"><a class="header" href="#compose-runner">Compose Runner</a></h3>
<ul>
<li><strong>Best for</strong>: reproducible multi-node environments and node control</li>
<li><strong>Logs</strong>: primarily via <code>docker compose logs</code> (and any node-level log configuration you apply)</li>
<li><strong>Debugging</strong>: set <code>COMPOSE_RUNNER_PRESERVE=1</code> to keep the environment up after a run</li>
</ul>
<p>Run the built-in compose examples:</p>
<pre><code class="language-bash">POL_PROOF_DEV_MODE=true \
scripts/run/run-examples.sh -t 60 -v 3 -e 1 compose
</code></pre>
<h3 id="k8s-runner"><a class="header" href="#k8s-runner">K8s Runner</a></h3>
<ul>
<li><strong>Best for</strong>: production-like behavior, cluster scheduling/networking</li>
<li><strong>Logs</strong>: <code>kubectl logs ...</code></li>
<li><strong>Debugging</strong>: set <code>K8S_RUNNER_PRESERVE=1</code> and <code>K8S_RUNNER_NAMESPACE=...</code> to keep resources around</li>
</ul>
<p>Run the built-in k8s examples:</p>
<pre><code class="language-bash">POL_PROOF_DEV_MODE=true \
scripts/run/run-examples.sh -t 60 -v 3 -e 1 k8s
</code></pre>
<hr />
<h2 id="artifacts--where-to-look"><a class="header" href="#artifacts--where-to-look">Artifacts &amp; Where to Look</a></h2>
<ul>
<li><strong>Node logs</strong>: configure via <code>NOMOS_LOG_DIR</code>, <code>NOMOS_LOG_LEVEL</code>, <code>NOMOS_LOG_FILTER</code> (see <a href="logging-observability.html">Logging &amp; Observability</a>)</li>
<li><strong>Runner logs</strong>: controlled by <code>RUST_LOG</code> (runner process only)</li>
<li><strong>Keep run directories</strong>: set <code>NOMOS_TESTS_KEEP_LOGS=1</code></li>
<li><strong>Compose environment preservation</strong>: set <code>COMPOSE_RUNNER_PRESERVE=1</code></li>
<li><strong>K8s environment preservation</strong>: set <code>K8S_RUNNER_PRESERVE=1</code></li>
</ul>
<hr />
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<ul>
<li><a href="scenario-lifecycle.html">Scenario Lifecycle</a></li>
<li><a href="running-examples.html">Running Examples</a></li>
<li><a href="troubleshooting.html">Troubleshooting Scenarios</a></li>
</ul>
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