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Added cloud-config headers explanation

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kayrus 2015-09-01 13:51:34 +02:00
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Documentation/cloud-config.md
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@ -26,7 +26,7 @@ We've designed our implementation to allow the same cloud-config file to work ac
The cloud-config file uses the [YAML][yaml] file format, which uses whitespace and new-lines to delimit lists, associative arrays, and values.
A cloud-config file must contain `#cloud-config`, followed by an associative array which has zero or more of the following keys:
A cloud-config file must contain a header: either `#cloud-config` for processing as cloud-config (suggested) or `#!` for processing as a shell script (advanced). If cloud-config has #cloud-config header, it should followed by an associative array which has zero or more of the following keys:
- `coreos`
- `ssh_authorized_keys`
@ -37,6 +37,8 @@ A cloud-config file must contain `#cloud-config`, followed by an associative arr
The expected values for these keys are defined in the rest of this document.
If cloud-config header starts on `#!` then coreos-cloudinit will recognize it as shell script which is interpreted by bash and run it as transient systemd service.
[yaml]: https://en.wikipedia.org/wiki/YAML
### Providing Cloud-Config with Config-Drive