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docs/agent/options: Add go-sockaddr template examples for -bind (#5701) 

Reference: https://github.com/hashicorp/consul/issues/4090

Examples covering a variety of potential use cases. Verified via `sockaddr eval` and `console agent -bind` on a test machine:

```console
# Baseline
$ sockaddr eval 'GetAllInterfaces'
[127.0.0.1/8 {1 65536 lo  up|loopback} ::1 {1 65536 lo  up|loopback} 10.0.0.10/8 {2 1500 eth0 b8:27:eb:7b:36:95 up|broadcast|multicast} fe80::12dc:5e4d:8ff8:2d96/64 {2 1500 eth0 b8:27:eb:7b:36:95 up|broadcast|multicast} 192.168.1.10/24 {3 1500 wlan0 b8:27:eb:2e:63:c0 up|broadcast|multicast} fe80::b6dc:5758:c306:b15b/64 {3 1500 wlan0 b8:27:eb:2e:63:c0 up|broadcast|multicast}]

# Using address within a specific CIDR
$ sockaddr eval 'GetPrivateInterfaces | include "network" "10.0.0.0/8" | attr "address"'
10.0.0.10

# Using a static network interface name
$ sockaddr eval 'GetInterfaceIP "eth0"'
10.0.0.10

# Using regular expression matching for network interface name that is forwardable and up
$ sockaddr eval 'GetAllInterfaces | include "name" "^eth" | include "flags" "forwardable|up" | attr "address"'
10.0.0.10
```
This commit is contained in:
Brian Flad 2019-05-13 09:08:05 -04:00 committed by Paul Banks
parent 521fd89497
commit 1fbe44d2c5
1 changed files with 16 additions and 1 deletions
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17
website/source/docs/agent/options.html.md
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@ -96,7 +96,22 @@ at startup. If you specify "[::]", Consul will
IPv6 address. If there are **multiple public IPv6 addresses** available, Consul
will exit with an error at startup.
Consul uses both TCP and UDP and the same port for both. If you
have any firewalls, be sure to allow both protocols. **In Consul 1.0 and later this can be set to a [go-sockaddr](https://godoc.org/github.com/hashicorp/go-sockaddr/template) template that needs to resolve to a single address.**
have any firewalls, be sure to allow both protocols. **In Consul 1.0 and later this can be set to a [go-sockaddr](https://godoc.org/github.com/hashicorp/go-sockaddr/template) template that needs to resolve to a single address.** Some example templates:
```sh
# Using address within a specific CIDR
$ consul agent -bind '{{ GetPrivateInterfaces | include "network" "10.0.0.0/8" | attr "address" }}'
```
```sh
# Using a static network interface name
$ consul agent -bind '{{ GetInterfaceIP "eth0" }}'
```
```sh
# Using regular expression matching for network interface name that is forwardable and up
$ consul agent -bind '{{ GetAllInterfaces | include "name" "^eth" | include "flags" "forwardable|up" | attr "address" }}'
```
* <a name="_serf_wan_bind"></a><a href="#_serf_wan_bind">`-serf-wan-bind`</a> -
The address that should be bound to for Serf WAN gossip communications. By