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Adds documentation for WAN address translation.

This commit is contained in:
James Phillips 2016-02-07 10:56:47 -08:00
parent c60a526fde
commit 590ab94d8d
4 changed files with 50 additions and 13 deletions
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9
website/source/docs/agent/dns.html.markdown
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@ -207,3 +207,12 @@ By default, all DNS results served by Consul set a 0 TTL value. This disables
caching of DNS results. However, there are many situations in which caching is
desirable for performance and scalability. This is discussed more in the guide
for [DNS Caching](/docs/guides/dns-cache.html).
## WAN Address Translation
Be default, Consul DNS queries will return a node's local address, even when
being queried from a remote datacenter. If you need to use a different address
to reach a node from outside its datacenter, you can configure this behavior
using the [`advertise-wan`](/docs/agent/options.html#_advertise-wan) and
[`translate_wan_addrs`](/docs/agent/options.html#translate_wan_addrs) configuration
options.

20
website/source/docs/agent/http/catalog.html.markdown
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@ -48,6 +48,9 @@ body must look something like:
"v1"
],
"Address": "127.0.0.1",
"TaggedAddresses": {
"wan": "127.0.0.1"
},
"Port": 8000
},
"Check": {
@ -64,7 +67,9 @@ body must look something like:
The behavior of the endpoint depends on what keys are provided. The endpoint
requires `Node` and `Address` to be provided while `Datacenter` will be defaulted
to match that of the agent. If only those are provided, the endpoint will register
the node with the catalog.
the node with the catalog. `TaggedAddresses` can be used in conjunction with the
[`translate_wan_addrs`](/docs/agent/options.html#translate_wan_addrs) configuration
option. Currently only the "wan" tag is supported.
If the `Service` key is provided, the service will also be registered. If
`ID` is not provided, it will be defaulted to the value of the `Service.Service` property.
@ -191,10 +196,16 @@ It returns a JSON body like this:
{
"Node": "baz",
"Address": "10.1.10.11"
"TaggedAddresses": {
"wan": "10.1.10.11"
}
},
{
"Node": "foobar",
"Address": "10.1.10.12"
"Address": "10.1.10.12",
"TaggedAddresses": {
"wan": "10.1.10.12"
}
}
]
```
@ -271,7 +282,10 @@ It returns a JSON body like this:
{
"Node": {
"Node": "foobar",
"Address": "10.1.10.12"
"Address": "10.1.10.12",
"TaggedAddresses": {
"wan": "10.1.10.12"
}
},
"Services": {
"consul": {

5
website/source/docs/agent/http/health.html.markdown
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@ -127,7 +127,10 @@ It returns a JSON body like this:
{
"Node": {
"Node": "foobar",
"Address": "10.1.10.12"
"Address": "10.1.10.12",
"TaggedAddresses": {
"wan": "10.1.10.12"
}
},
"Service": {
"ID": "redis",

25
website/source/docs/agent/options.html.markdown
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@ -41,13 +41,17 @@ The options below are all specified on the command-line.
If this address is not routable, the node will be in a constant flapping state
as other nodes will treat the non-routability as a failure.
* <a name="_advertise-wan"></a><a href="#_advertise-wan">`-advertise-wan`</a> - The advertise wan
address is used to change the address that we advertise to server nodes joining
through the WAN. By default, the [`-advertise`](#_advertise) address is advertised.
However, in some cases all members of all datacenters cannot be on the same
physical or virtual network, especially on hybrid setups mixing cloud and private datacenters.
This flag enables server nodes gossiping through the public network for the WAN while using
private VLANs for gossiping to each other and their client agents.
* <a name="_advertise-wan"></a><a href="#_advertise-wan">`-advertise-wan`</a> - The
advertise WAN address is used to change the address that we advertise to server nodes
joining through the WAN. This can also be set on client agents when used in combination
with the <a href="#translate_wan_addrs">`translate_wan_addrs`</a> configuration
option. By default, the [`-advertise`](#_advertise) address is advertised. However, in some
cases all members of all datacenters cannot be on the same physical or virtual network,
especially on hybrid setups mixing cloud and private datacenters. This flag enables server
nodes gossiping through the public network for the WAN while using private VLANs for gossiping
to each other and their client agents, and it allows client agents to be reached at this
address when being accessed from a remote datacenter if the remote datacenter is configured
with <a href="#translate_wan_addrs">`translate_wan_addrs`</a>.
* <a name="_atlas"></a><a href="#_atlas">`-atlas`</a> - This flag
enables [Atlas](https://atlas.hashicorp.com) integration.
@ -623,6 +627,13 @@ definitions support being updated during a reload.
[`enable_syslog`](#enable_syslog) is provided, this controls to which
facility messages are sent. By default, `LOCAL0` will be used.
* <a name="translate_wan_addrs"</a><a href="#translate_wan_addrs">`translate_wan_addrs`</a> If
set to true, Consul will prefer a node's configured <a href="#_advertise-wan">WAN address</a>
when servicing DNS requests for a node in a remote datacenter. This allows the node to be
reached within its own datacenter using its local address, and reached from other datacenters
using its WAN address, which is useful in hybrid setups with mixed networks. This is disabled
by default.
* <a name="ui"></a><a href="#ui">`ui`</a> - Equivalent to the [`-ui`](#_ui)
command-line flag.