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Typical Charliecloud workflows are based around Docker containers, but it is not
strictly necessary to install Docker itself on the HPC resource. A common
pattern is to build the Docker container on a laptop or VM and upload the result
to the cluster for use with Charliecloud. More information can be found at
\href{https://hpc.github.io/charliecloud/}
    {\color{blue}{https://hpc.github.io/charliecloud/}}
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