Add linux spec description
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
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# Linux
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The Linux container specification uses various kernel features like namespaces,
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cgroups, capabilities, LSM, and file system jails to fulfill the spec.
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Additional information is needed for Linux over the default spec configuration
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in order to configure these various kernel features.
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## Linux namespaces
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A namespace wraps a global system resource in an abstraction that makes it
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## Linux control groups
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Also known as cgroups, they are used to restrict resource usage for a container and handle
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device access. cgroups provide controls to restruct cpu, memory, IO, and network for
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device access. cgroups provide controls to restrict cpu, memory, IO, and network for
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the container.
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## Linux capabilities
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