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# <a name="glossary" />Glossary
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## <a name="glossaryBundle" />Bundle
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A [directory structure ](bundle.md ) that is written ahead of time, distributed, and used to seed the runtime for creating a [container ](#container ) and launching a process within it.
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## <a name="glossaryConfiguration" />Configuration
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The [`config.json` ](config.md ) file in a [bundle ](#bundle ) which defines the intended [container ](#container ) and container process.
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## <a name="glossaryContainer" />Container
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An environment for executing processes with configurable isolation and resource limitations.
For example, namespaces, resource limits, and mounts are all part of the container environment.
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## <a name="glossaryContainerNamespace" />Container namespace
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On Linux, a leaf in the [namespace][namespaces.7] hierarchy in which the [configured process ](config.md#process ) executes.
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## <a name="glossaryJson" />JSON
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All configuration [JSON][] MUST be encoded in [UTF-8][].
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JSON objects MUST NOT include duplicate names.
The order of entries in JSON objects is not significant.
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## <a name="glossaryRuntime" />Runtime
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An implementation of this specification.
It reads the [configuration files ](#configuration ) from a [bundle ](#bundle ), uses that information to create a [container ](#container ), launches a process inside the container, and performs other [lifecycle actions ](runtime.md ).
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## <a name="glossaryRuntimeNamespace" />Runtime namespace
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On Linux, a leaf in the [namespace][namespaces.7] hierarchy from which the [runtime ](#runtime ) process is executed.
New container namespaces will be created as children of the runtime namespaces.
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[JSON]: https://tools.ietf.org/html/rfc7159
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[UTF-8]: http://www.unicode.org/versions/Unicode8.0.0/ch03.pdf
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[namespaces.7]: http://man7.org/linux/man-pages/man7/namespaces.7.html
