[Nix-dev] Multiple instances - detecting resource collisions - nixos module system question

[Moritz Ulrich]

Luca Bruno <lethalman88 at gmail.com> writes:

> On 15/01/2015 01:23, Nicolas Pierron wrote:
>> On Wed, Jan 14, 2015 at 11:17 PM, Marc Weber <marco-oweber at gmx.de> wrote:
>>> If you use multiple apaches/nginx/mysql/postgresql/whatever instances
>>> its likely to miss adjusting the port or whatsoever. Therefore I'd like
>>> to implement a simple "resource tracking" module which fails if a
>>> resource such as tcp/ip port or socket or such gets used multiple times.
>> This is awesome!
> This is a mess:
> 1) A service can bind to multiple ip and ports.

So we can just use a list of ports instead of a single one.

> 2) There's not only tcp.

So two lists? UDP and TCP ports.

> 3) A service could start listening dynamically on other ports at
> runtime.

This is a valid point. An approach like this needs to trust the services
not to lie about their list of used ports.

>
> This is enough for saying it's going to be too complicated to check for
> conflicts with little gain and many false positives.
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