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