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# cloud-init
Cloud-init is the *industry standard* multi-distribution method for
cross-platform cloud instance initialization. It is supported across all
major public cloud providers, provisioning systems for private cloud
infrastructure, and bare-metal installations.
Cloud instances are initialized from a disk image and instance data:
- Cloud metadata
- User data (optional)
- Vendor data (optional)
Cloud-init will identify the cloud it is running on during boot, read any
provided metadata from the cloud and initialize the system accordingly. This
may involve setting up network and storage devices to configuring SSH
access key and many other aspects of a system. Later on cloud-init will
also parse and process any optional user or vendor data that was passed to the
instance.
## Getting help
If you need support, start with the [user documentation](https://cloudinit.readthedocs.io/en/latest/).
If you need additional help consider reaching out with one of the following options:
- Ask a question in the [``#cloud-init`` IRC channel on Libera](https://kiwiirc.com/nextclient/irc.libera.chat/cloud-init)
- Search the cloud-init [mailing list archive](https://lists.launchpad.net/cloud-init/)
* Follow announcements or ask a question on [the cloud-init Discourse forum](https://discourse.ubuntu.com/c/server/cloud-init/)
- Join the [cloud-init mailing list](https://launchpad.net/~cloud-init) and participate
- Find a bug? [Report bugs on GitHub Issues](https://github.com/canonical/cloud-init/issues)
## Distribution and cloud support
The majority of [clouds](https://cloudinit.readthedocs.io/en/latest/reference/datasources.html#datasources_supported)
and [Linux / Unix OSes](https://cloudinit.readthedocs.io/en/latest/reference/distros.html)
are supported by and ship with cloud-init. If your distribution or cloud is not
supported, please get in contact with that distribution and send them our way!
## To start developing cloud-init
Checkout the [contributing](https://cloudinit.readthedocs.io/en/latest/development/contributing.html)
document that outlines the steps necessary to develop, test, and submit code.
## Daily builds
Daily builds are useful if you want to try the latest upstream code for the latest
features or to verify bug fixes.
For Ubuntu, see the [Daily PPAs](https://code.launchpad.net/~cloud-init-dev/+archive/ubuntu/daily)
For CentOS, see the [COPR build repos](https://copr.fedorainfracloud.org/coprs/g/cloud-init/cloud-init-dev/)
## Build / packaging
To see reference build/packaging implementations, refer to [packages](packages).
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