Add user data into general concept
This patch add brief introduction of user data, how nova offer it to end user and server consume it. blueprint complete-todo-in-api-concept-doc Change-Id: I3514247698bc4eeae358ae2a1ee9ad4e77d764fc
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@ -86,6 +86,17 @@ several key concepts:
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reason. Such a separation is possible in Nova if an admin carefully sets up
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availability zones for that, but it is not the default.
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- **User data**
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A user data file is a special key in the metadata service that holds a file
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that cloud-aware applications in the server can access.
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Nova has two ways to send user data to the deploying instance, one is by
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metadata service to let server able to connect to its metadata through
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a predefined ip address (169.254.169.254), then other is to use config
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drive which will wrap metadata into a iso9660 or vfat format disk so that
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the new deployed server can consume it by active engines such as cloud-init
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during its boot process.
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Networking Concepts
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-------------------
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