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From Yann Ylavic <ylavic....@gmail.com>
Subject Re: [PATCH] Add "FreeListen" to support IP_FREEBIND
Date Tue, 08 Mar 2016 09:36:35 GMT
On Mon, Mar 7, 2016 at 12:41 PM, Jan Kalu┼ża <jkaluza@redhat.com> wrote:
>
> This is needed for httpd startup with systemd when one wants to use
> particular IP address to bind. There is no way how to start httpd after the
> IP address has been configured in systemd and according to systemd
> developers, the applications should become more robust to handle network
> changes like that. The full reasoning is explained here [1].

Another use case is keepalived (VRRP) where the IPs are set by the
daemon when needed (eg. fail-over), and hence not always available at
startup.
It may be worth mentioning in the docs that this new feature would
help in such case, and could replace settings like sysctl's
net.ipv[46].ip_nonlocal_bind which are system (or at least network
namespace) wide.

Regards,
Yann.

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