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<h1>Architecture and design</h1>
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<div class="lead">Jenkins Operator fundamentals</div>
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<p>The <strong>Jenkins Operator</strong> design incorporates the following concepts:
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- watches any changes of manifests and maintain the desired state according to deployed custom resource manifest
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- implements the main reconciliation loop which consists of two smaller reconciliation loops - base and user</p>
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<p><img src="/kubernetes-operator/img/reconcile.png" alt="reconcile" /></p>
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<p><strong>Base</strong> reconciliation loop takes care of reconciling base Jenkins configuration, which consists of:
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- Ensure Manifests - monitors any changes in manifests
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- Ensure Jenkins Pod - creates and verifies status of Jenkins master Pod
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- Ensure Jenkins Configuration - configures Jenkins instance including hardening, initial configuration for plugins, etc.
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- Ensure Jenkins API token - generates Jenkins API token and initialized Jenkins client</p>
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<p><strong>User</strong> reconciliation loop takes care of reconciling user provided configuration, which consists of:
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- Ensure Restore Job - creates Restore job and ensures that restore has been successfully performed<br />
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- Ensure Seed Jobs - creates Seed Jobs and ensures that all of them have been successfully executed
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- Ensure User Configuration - executed user provided configuration, like groovy scripts, configuration as code or plugins
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- Ensure Backup Job - creates Backup job and ensures that backup has been successfully performed</p>
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<p><img src="/kubernetes-operator/img/phases.png" alt="reconcile" /></p>
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<h2 id="operator-state">Operator State</h2>
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<p>Operator state is kept in custom resource status section, which is used for storing any configuration events or job statuses managed by the operator.
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It helps to maintain or recover desired state even after operator or Jenkins restarts.</p>
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<div class="text-muted mt-5 pt-3 border-top">Last modified August 5, 2019
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