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Feature request: specify IP range(s) to use for binding #1620

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DanielDent opened this issue Jan 16, 2016 · 5 comments
Closed

Feature request: specify IP range(s) to use for binding #1620

DanielDent opened this issue Jan 16, 2016 · 5 comments

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@DanielDent
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@DanielDent DanielDent commented Jan 16, 2016

-bind - .... "By default, this is "0.0.0.0", meaning Consul will use the first available private IP address."

It would be nice to have an option such as -bind-ranges where users can specify the CIDRs for interfaces which are acceptable to bind to.

With some SDN implementations, it's common to have multiple private IP ranges available on a node. But only some of those interfaces will be on a network which is reachable by all the other nodes in the cluster. Having this configuration option would avoid the need to create a pre-startup script which does introspection of the node to identify an appropriate bind address.

@ryanuber
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@ryanuber ryanuber commented Jan 16, 2016

There is a related discussion in Nomad here: hashicorp/nomad#223. The TL;DR is that it may be more consistent to allow binding to a named interface, though we are still thinking about the best solution.

@DanielDent
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@DanielDent DanielDent commented Jan 16, 2016

Sorry I missed that issue in my search. I'll jump in on that thread. Thanks.

@DanielDent
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@DanielDent DanielDent commented Jan 16, 2016

Oh, that issue was on nomad, that's why I missed it. I guess this issue is equally applicable to both projects.

@llevar
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@llevar llevar commented Feb 15, 2016

+1 for this.

This was referenced Nov 30, 2016
@sean-
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@sean- sean- commented Dec 2, 2016

@DanielDent / @llevar : Please give the latest code in master a twirl. The syntax for supporting IP addresses or getting the first "usable" IP address on an interface is included below and can be passed to any address parameter within Consul (e.g. -bind or bind_addr, or any other *_addr-like parameter):

-bind='{{ GetInterfaceIP "eth0" }}'
-bind='{{ GetAllInterfaces | include "network" "10.0.0.0/8" }}'

There is now a configurable template language for examples and docs) behind this that you can use to create a customizable heuristic that should allow you to get whatever it is that you need from your environment when using an immutable image (see hashicorp/go-sockaddr/template and cmd/sockaddr.

@sean- sean- closed this Dec 2, 2016
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