52 lines
1.4 KiB
Markdown
52 lines
1.4 KiB
Markdown
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# coreos-init
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CoreOS allows a user to customize EC2 instances by providing either an executable script or a cloud-config document as instance user-data. See below to learn how to use these features.
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## cloud-config
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Only a subset of [cloud-config functionality][cloud-config] is implemented. A set of custom parameters were added to the cloud-config format that are specific to CoreOS.
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[cloud-config]: http://cloudinit.readthedocs.org/en/latest/topics/format.html#cloud-config-data
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### Supported cloud-config Parameters
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#### ssh_authorized_keys
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Provided public SSH keys will be authorized for the `core` user.
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### Custom cloud-config Parameters
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#### coreos.etcd.discovery_url
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The value of `coreos.etcd.discovery_url` will be used to discover the instance's etcd peers using the [etcd discovery protocol][disco-proto]. Usage of the [public discovery service][disco-service] is encouraged.
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[disco-proto]: https://github.com/coreos/etcd/blob/master/Documentation/discovery-protocol.md
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[disco-service]: http://discovery.etcd.io
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## user-data Script
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Simply set your user-data to a script where the first line is a shebang:
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```
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#!/bin/bash
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echo 'Hello, world!'
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```
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## Examples
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### Inject an SSH key and bootstrap an etcd cluster using cloud-config
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```
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#cloud-config
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coreos:
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etcd:
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discovery_url: https://discovery.etcd.io/827c73219eeb2fa5530027c37bf18877
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ssh_authorized_keys:
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- ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC0g+ZTxC7weoIJLUafOgrm+h...
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```
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