doc(fields): Document field substitution
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@@ -11,9 +11,7 @@ Only a subset of [cloud-config functionality][cloud-config] is implemented. A se
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### coreos.etcd
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The `coreos.etcd.*` options are translated to a partial systemd unit acting as an etcd configuration file.
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`coreos-cloudinit` will also replace the strings `$private_ipv4` and `$public_ipv4` with the values generated by CoreOS based on a given provider.
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For example, the following cloud-config document...
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We can use the templating feature of coreos-cloudinit to automate etcd configuration with the `$private_ipv4` and `$public_ipv4` fields. For example, the following cloud-config document...
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```
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#cloud-config
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