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<div class="section" id="overview">
<h1>Overview<a class="headerlink" href="#overview" title="Permalink to this headline">¶</a></h1>
<div class="section" id="what-is-charliecloud">
<h2>What is Charliecloud?<a class="headerlink" href="#what-is-charliecloud" title="Permalink to this headline">¶</a></h2>
<p>Charliecloud provides user-defined software stacks (UDSS) for high-performance
computing (HPC) centers. This “bring your own software stack” functionality
addresses needs such as:</p>
<ul class="simple">
<li>software dependencies that are numerous, complex, unusual, diferently
configured, or simply newer/older than what the center provides;</li>
<li>build-time requirements unavailable within the center, such as relatively
unfettered internet access;</li>
<li>validated software stacks and configuration to meet the standards of a
particular field of inquiry;</li>
<li>portability of environments between resources, including workstations and
other test and development system not managed by the center;</li>
<li>consistent environments, even archivally so, that can be easily, reliabily,
and verifiably reproduced in the future; and/or</li>
<li>usability and comprehensibility.</li>
</ul>
<p><strong>WARNING: Cray CLE in recent versions</strong> has a bug that crashes nodes when
cleaning up after some jobs, including if Charliecloud has been used. See the
installation instructions for a workaround.</p>
</div>
<div class="section" id="how-does-it-work">
<h2>How does it work?<a class="headerlink" href="#how-does-it-work" title="Permalink to this headline">¶</a></h2>
<p>Charliecloud uses Linux user namespaces to run containers with no privileged
operations or daemons and minimal configuration changes on center resources.
This simple approach avoids most security risks while maintaining access to
the performance and functionality already on offer.</p>
<p>Container images can be built using Docker or anything else that can generate
a standard Linux filesystem tree.</p>
<p>Because user namespaces are available only in newer kernel versions, an
experimental setuid mode is also provided to let sites evaluate Charliecloud
even if they do not have user namespace-capable kernels readily available.</p>
</div>
<div class="section" id="how-do-i-learn-more">
<h2>How do I learn more?<a class="headerlink" href="#how-do-i-learn-more" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Documentation: <a class="reference external" href="https://hpc.github.io/charliecloud">https://hpc.github.io/charliecloud</a></li>
<li>GitHub repository: <a class="reference external" href="https://github.com/hpc/charliecloud">https://github.com/hpc/charliecloud</a></li>
<li>We wrote an article for USENIX’s magazine <em>;login:</em> that explains in more
detail the motivation for Charliecloud and the technology upon which it is
based: <a class="reference external" href="https://www.usenix.org/publications/login/fall2017/priedhorsky">https://www.usenix.org/publications/login/fall2017/priedhorsky</a></li>
<li>A more technical resource is our Supercomputing 2017 paper:
<a class="reference external" href="http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-16-22370">http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-16-22370</a></li>
</ul>
</div>
<div class="section" id="who-is-responsible">
<h2>Who is responsible?<a class="headerlink" href="#who-is-responsible" title="Permalink to this headline">¶</a></h2>
<p>The core Charliecloud team at Los Alamos is:</p>
<ul class="simple">
<li>Reid Priedhorsky <<a class="reference external" href="mailto:reidpr%40lanl.gov">reidpr<span>@</span>lanl<span>.</span>gov</a>>, co-founder and BDFL</li>
<li>Tim Randles <<a class="reference external" href="mailto:trandles%40lanl.gov">trandles<span>@</span>lanl<span>.</span>gov</a>>, co-founder</li>
<li>Michael Jennings <<a class="reference external" href="mailto:mej%40lanl.gov">mej<span>@</span>lanl<span>.</span>gov</a>></li>
</ul>
<p>Patches (code, documentation, etc.) contributed by:</p>
<ul class="simple">
<li>Reid Priedhorsky <<a class="reference external" href="mailto:reidpr%40lanl.gov">reidpr<span>@</span>lanl<span>.</span>gov</a>></li>
<li>Oliver Freyermuth <<a class="reference external" href="mailto:o.freyermuth%40googlemail.com">o<span>.</span>freyermuth<span>@</span>googlemail<span>.</span>com</a>></li>
<li>Matthew Vernon <<a class="reference external" href="mailto:mv3%40sanger.ac.uk">mv3<span>@</span>sanger<span>.</span>ac<span>.</span>uk</a>></li>
<li>Lowell Wofford <<a class="reference external" href="mailto:lowell%40lanl.gov">lowell<span>@</span>lanl<span>.</span>gov</a>></li>
</ul>
</div>
<div class="section" id="how-can-i-participate">
<h2>How can I participate?<a class="headerlink" href="#how-can-i-participate" title="Permalink to this headline">¶</a></h2>
<p>Questions, comments, feature requests, bug reports, etc. can be directed to:</p>
<ul class="simple">
<li>our mailing list: <em>charliecloud@groups.io</em> or <a class="reference external" href="https://groups.io/g/charliecloud">https://groups.io/g/charliecloud</a></li>
<li>issues on GitHub</li>
</ul>
<p>Patches are much appreciated on the software itself as well as documentation.
Optionally, please include in your first patch a credit for yourself in the
list above.</p>
<p>We are friendly and welcoming of diversity on all dimensions.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This documentation is for Charliecloud version 0.2.3~pre (Git commit
) and was built 2018-01-07 15:56 GMT+00:00.</p>
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