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@@ -25,7 +25,7 @@ Singularity provides the functionality of a virtual machine, without the heavywe
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### The Singularity Solution
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Singularity has two primary roles:
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1.**Container Image Management:** Singularity supports building different container image formats from scratch using your choice of Linux distribution bases or leveraging other container formats (e.g. Docker Hub). Container formats supported are the default compressed immutable (read only) image files, writable raw file system based images, and sandboxes (*chroot* style directories).
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1.**Container Image Generator:** Singularity supports building different container image formats from scratch using your choice of Linux distribution bases or leveraging other container formats (e.g. Docker Hub). Container formats supported are the default compressed immutable (read only) image files, writable raw file system based images, and sandboxes (*chroot* style directories).
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2.**Container Runtime:** The Singularity runtime is designed to leverage the above mentioned container formats and support the concept of *untrusted users running untrusted containers*. This counters the typical container runtime practice of *trusted users running trusted containers* and as a result of that, Singularity utilizes a very different security paradigm. This is a required feature for implementation within any multi-user environment.
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The Singularity containers themselves are purpose built and can include a simple application and library stack or a complicated work flow that can interface with the hosts resources directly or run isolated from the host and other containers. You can even launch a contained work flow by executing the image file directly! For example, assuming that `~/bin` is in the user's path as it is normally by default:
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