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Clear Caches
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Cache Directory
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Scan Cache Backend
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Local File System
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Memory
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Databases
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Others
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Supply Chain
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<li class="md-nav__item">
<a href="../../supply-chain/sbom/" class="md-nav__link">
<span class="md-ellipsis">
SBOM
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4_6_2" >
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Attestation
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SBOM
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<a href="../../supply-chain/attestation/vuln/" class="md-nav__link">
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Cosign Vulnerability Scan Record
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<li class="md-nav__item">
<a href="../../supply-chain/attestation/rekor/" class="md-nav__link">
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SBOM Attestation in Rekor
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VEX
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</label>
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VEX
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Overview
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</li>
<li class="md-nav__item">
<a href="../../supply-chain/vex/repo/" class="md-nav__link">
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VEX Repository
</span>
</a>
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<a href="../../supply-chain/vex/file/" class="md-nav__link">
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Local VEX Files
</span>
</a>
</li>
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<a href="../../supply-chain/vex/sbom-ref/" class="md-nav__link">
<span class="md-ellipsis">
VEX SBOM Reference
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</a>
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<li class="md-nav__item">
<a href="../../supply-chain/vex/oci/" class="md-nav__link">
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VEX Attestation
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Built-in Compliance
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<a href="../../compliance/contrib-compliance/" class="md-nav__link">
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Custom Compliance
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Plugins
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Plugins
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Overview
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User guide
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Developer guide
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Advanced
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Advanced
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Modules
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Connectivity and Network considerations
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<a href="../../advanced/self-hosting/" class="md-nav__link">
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Self-Hosting Trivy's Databases
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_4_9_4" >
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Container Image
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Container Image
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Embed in Dockerfile
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<a href="../../advanced/container/unpacked-filesystem/" class="md-nav__link">
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Unpacked container image filesystem
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Private Docker Registries
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<nav class="md-nav" data-md-level="4" aria-labelledby="__nav_4_9_4_3_label" aria-expanded="false">
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Private Docker Registries
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Overview
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</li>
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<a href="../../advanced/private-registries/docker-hub/" class="md-nav__link">
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Docker Hub
</span>
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</li>
<li class="md-nav__item">
<a href="../../advanced/private-registries/ecr/" class="md-nav__link">
<span class="md-ellipsis">
AWS ECR (Elastic Container Registry)
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</a>
</li>
<li class="md-nav__item">
<a href="../../advanced/private-registries/gcr/" class="md-nav__link">
<span class="md-ellipsis">
GCR (Google Container Registry)
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../../advanced/private-registries/acr/" class="md-nav__link">
<span class="md-ellipsis">
ACR (Azure Container Registry)
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../../advanced/private-registries/self/" class="md-nav__link">
<span class="md-ellipsis">
Self-Hosted
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<li class="md-nav__item">
<a href="../../advanced/telemetry/" class="md-nav__link">
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Usage Telemetry
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Clean
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Config
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Convert
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Filesystem
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Image
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Kubernetes
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Module
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Module Install
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Plugin
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Plugin Info
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Plugin Install
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Plugin List
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Plugin Run
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Plugin Uninstall
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Plugin Update
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Plugin Upgrade
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Registry
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Registry Login
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<a href="../../references/configuration/cli/trivy_registry_logout/" class="md-nav__link">
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Registry Logout
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Repository
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Rootfs
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<a href="../../references/configuration/cli/trivy_sbom/" class="md-nav__link">
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SBOM
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<a href="../../references/configuration/cli/trivy_server/" class="md-nav__link">
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Server
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<a href="../../references/configuration/cli/trivy_version/" class="md-nav__link">
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<span class="md-ellipsis">
VEX
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<span class="md-nav__icon md-icon"></span>
</label>
<nav class="md-nav" data-md-level="5" aria-labelledby="__nav_4_10_1_1_16_label" aria-expanded="false">
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VEX
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<ul class="md-nav__list" data-md-scrollfix>
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<a href="https://github.com/aquasecurity/trivy/blob/main/docs/docs/configuration/cache.md" title="Edit this page" class="md-content__button md-icon">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg>
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<h1 id="cache">Cache<a class="headerlink" href="#cache" title="Permanent link">&para;</a></h1>
<p>The cache directory includes </p>
<ul>
<li>Cache of previous scans (Scan cache).</li>
<li><a href="../db/">Vulnerability Database</a><sup id="fnref:1"><a class="footnote-ref" href="#fn:1">1</a></sup></li>
<li><a href="../db/">Java Index Database</a><sup id="fnref:2"><a class="footnote-ref" href="#fn:2">2</a></sup></li>
<li><a href="../../scanner/misconfiguration/check/builtin/">Misconfiguration Checks</a><sup id="fnref:3"><a class="footnote-ref" href="#fn:3">3</a></sup></li>
<li><a href="../../supply-chain/vex/repo/">VEX Repositories</a></li>
</ul>
<p>The cache option is common to all scanners.</p>
<h2 id="clear-caches">Clear Caches<a class="headerlink" href="#clear-caches" title="Permanent link">&para;</a></h2>
<p><code>trivy clean</code> subcommand removes caches.</p>
<div class="highlight"><pre><span></span><code>$<span class="w"> </span>trivy<span class="w"> </span>clean<span class="w"> </span>--scan-cache
</code></pre></div>
<details>
<summary>Result</summary>
<div class="highlight"><pre><span></span><code>2024-06-21T21:58:21+04:00 INFO Removing scan cache...
</code></pre></div>
</details>
<p>If you want to delete cached vulnerability databases, use <code>--vuln-db</code>.
You can also delete all caches with <code>--all</code>.
See <code>trivy clean --help</code> for details.</p>
<h2 id="cache-directory">Cache Directory<a class="headerlink" href="#cache-directory" title="Permanent link">&para;</a></h2>
<p>Specify where the cache is stored with <code>--cache-dir</code>.</p>
<div class="highlight"><pre><span></span><code>$<span class="w"> </span>trivy<span class="w"> </span>--cache-dir<span class="w"> </span>/tmp/trivy/<span class="w"> </span>image<span class="w"> </span>python:3.4-alpine3.9
</code></pre></div>
<h2 id="scan-cache-backend">Scan Cache Backend<a class="headerlink" href="#scan-cache-backend" title="Permanent link">&para;</a></h2>
<div class="admonition warning">
<p class="admonition-title">EXPERIMENTAL</p>
<p>This feature might change without preserving backwards compatibility.</p>
</div>
<p>Trivy utilizes a scan cache to store analysis results, such as package lists.
It supports three types of backends for this cache: </p>
<ul>
<li>Local File System (<code>fs</code>)<ul>
<li>The cache path can be specified by <code>--cache-dir</code></li>
</ul>
</li>
<li>Memory (<code>memory</code>)</li>
<li>Redis (<code>redis://</code>)<ul>
<li><code>redis://[HOST]:[PORT]</code></li>
<li>TTL can be configured via <code>--cache-ttl</code></li>
</ul>
</li>
</ul>
<h3 id="local-file-system">Local File System<a class="headerlink" href="#local-file-system" title="Permanent link">&para;</a></h3>
<p>The local file system backend is the default choice for container image, VM image and repository scans.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Internally, this backend uses <a href="https://github.com/etcd-io/bbolt">BoltDB</a>, which has an important limitation: only one process can access the cache at a time.
Subsequent processes attempting to access the cache will be locked.
For more details on this limitation, refer to the <a href="https://trivy.dev/v0.67.2/docs/references/troubleshooting/#running-in-parallel-takes-same-time-as-series-run">troubleshooting guide</a>.</p>
</div>
<h3 id="memory">Memory<a class="headerlink" href="#memory" title="Permanent link">&para;</a></h3>
<p>The memory backend stores analysis results in memory, which means the cache is discarded when the process ends.
This makes it useful in scenarios where caching is not required or desired.
It serves as the default for filesystem and SBOM scans and can also be employed for container image scans when caching is unnecessary.</p>
<p>To use the memory backend for a container image scan, you can use the following command:</p>
<div class="highlight"><pre><span></span><code>$<span class="w"> </span>trivy<span class="w"> </span>image<span class="w"> </span>debian:11<span class="w"> </span>--cache-backend<span class="w"> </span>memory
</code></pre></div>
<h3 id="redis">Redis<a class="headerlink" href="#redis" title="Permanent link">&para;</a></h3>
<p>The Redis backend is particularly useful when you need to share the cache across multiple Trivy instances.
You can set up Trivy to use a Redis backend with a command like this:</p>
<div class="highlight"><pre><span></span><code>$<span class="w"> </span>trivy<span class="w"> </span>server<span class="w"> </span>--cache-backend<span class="w"> </span>redis://localhost:6379
</code></pre></div>
<p>This approach allows for centralized caching, which can be beneficial in distributed or high-concurrency environments.</p>
<p>If you want to use TLS with Redis, you can enable it by specifying the <code>--redis-tls</code> flag.</p>
<div class="highlight"><pre><span></span><code>$<span class="w"> </span>trivy<span class="w"> </span>server<span class="w"> </span>--cache-backend<span class="w"> </span>redis://localhost:6379<span class="w"> </span>--redis-tls
</code></pre></div>
<p>Trivy also supports for connecting to Redis with your certificates.
You need to specify <code>--redis-ca</code> , <code>--redis-cert</code> , and <code>--redis-key</code> options.</p>
<div class="highlight"><pre><span></span><code>$ trivy server --cache-backend redis://localhost:6379 \
--redis-ca /path/to/ca-cert.pem \
--redis-cert /path/to/cert.pem \
--redis-key /path/to/key.pem
</code></pre></div>
<div class="footnote">
<hr />
<ol>
<li id="fn:1">
<p>Downloaded when scanning for vulnerabilities&#160;<a class="footnote-backref" href="#fnref:1" title="Jump back to footnote 1 in the text">&#8617;</a></p>
</li>
<li id="fn:2">
<p>Downloaded when scanning <code>jar/war/par/ear</code> files&#160;<a class="footnote-backref" href="#fnref:2" title="Jump back to footnote 2 in the text">&#8617;</a></p>
</li>
<li id="fn:3">
<p>Downloaded when scanning for misconfigurations&#160;<a class="footnote-backref" href="#fnref:3" title="Jump back to footnote 3 in the text">&#8617;</a></p>
</li>
</ol>
</div>
</article>
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