DigitalOcean DigitalOcean CloudInit and Droplet Metadata ?

eva2000 · Nov 1, 2014

Anyone here tried DigitalOcean's new Droplet Metadata and CloudInit features ? Seems only Ubuntu 14 and CentOS 7 have DigitalOcean Cloudinit enabled in their default provided OS images.

Easily Automate The Provisioning Of Your DigitalOcean Droplets! | DigitalOcean

An Introduction to Droplet Metadata | DigitalOcean

An Introduction to Cloud-Config Scripting | DigitalOcean

Full documentation of the Metadata service and its endpoints are available at the DigitalOcean Developer's Portal.

Our metadata service is live! This enables Droplets to query information about themselves, and allows the use of CloudInit to bootstrap new servers. This is significant for users who want to improve the automation of their server provisioning process. As there are several products and services tied into this release, we want to provide a quick overview to get users up and running.

What kind of information is available via metadata?
Examples of available Droplet metadata include Droplet ID, data center region, IP addresses, and user-data.

What is user-data?
User-data is a special piece of metadata that can be provided by the user during the Droplet creation process. This data can be consumed by CloudInit to configure a server.

Which regions support metadata?
At launch, the SGP1, SFO1, LON1, AMS2, AMS3, & NYC3 regions have metadata available. It is enabled on new droplets in these regions.

What is CloudInit?
CloudInit is a process enabled on recent DigitalOcean images that is able to pull down and process information from metadata. When the Droplet boots for the first time, the CloudInit program executes the script it finds in the “user-data” field, providing users the opportunity to automate the initial configuration of their servers.

Which images can process metadata information with CloudInit?
Currently, Ubuntu 14.04 and CentOS 7 base images have CloudInit enabled. Any one-click apps based on these releases will also have this functionality available. CoreOS servers also process the “user-data” field using a different mechanism.

Where can I learn more about using metadata and CloudInit?
We have prepared community articles that cover using the metadata service and writing scripts for CloudConfig. Also, our developer portal contains full documentation of the Metadata API.
Click to expand...

About User Data
User data is arbitrary data that a user can supply to a droplet during its creation time. User data can be consumed by CloudInit, typically during the first boot of a cloud server, to perform tasks or run scripts as the root user--this can be extremely useful when provisioning a server. CloudInit is currently available on DigitalOcean's latest CoreOS, Ubuntu 14.04, and CentOS 7 images. User data may be defined for images that do not support CloudInit, but it will not be consumed automatically on the first boot.

CloudInit accepts cloud-config files or any script that can be interpreted by the new droplet, such as bash scripts. For help with writing cloud-config files, check out our tutorial: An Introduction to Cloud-Config Scripting.
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