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doc(etcd): Update etcd docs

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Brian Waldon 2014-03-19 14:23:25 -07:00
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Documentation/cloud-config.md
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@ -8,20 +8,38 @@ Only a subset of [cloud-config functionality][cloud-config] is implemented. A se
## CoreOS Parameters ## CoreOS Parameters
### coreos.etcd.discovery_url ### coreos.etcd
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. **Note:** this is currently Amazon-only. The `coreos.etcd.*` options are translated to a partial systemd unit acting as an etcd configuration file.
`coreos-cloudinit` will also replace the strings `$private_ipv4` and `$public_ipv4` with the values generated by CoreOS based on a given provider.
For example, the following cloud-config document...
``` ```
#cloud-config #cloud-config
coreos: coreos:
etcd: etcd:
discovery_url: https://discovery.etcd.io/827c73219eeb2fa5530027c37bf18877 name: node001
discovery: https://discovery.etcd.io/3445fa65423d8b04df07f59fb40218f8
addr: $public_ipv4:4001
peer-addr: $private_ipv4:7001
``` ```
[disco-proto]: https://github.com/coreos/etcd/blob/master/Documentation/discovery-protocol.md ...will generate a systemd unit drop-in like this:
[disco-service]: http://discovery.etcd.io
```
[Service]
Environment="ETCD_NAME=node001""
Environment="ETCD_DISCOVERY=https://discovery.etcd.io/3445fa65423d8b04df07f59fb40218f8"
Environment="ETCD_ADDR=203.0.113.29:4001"
Environment="ETCD_PEER_ADDR=192.0.2.13:7001"
```
For more information about the available configuration options, see the [etcd documentation][etcd-config].
Note that hyphens in the coreos.etcd.* keys are mapped to underscores.
[etcd-config]: https://github.com/coreos/etcd/blob/master/Documentation/configuration.md
### coreos.units ### coreos.units