netdev - Seamless Service Restart / Port Takeover

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Message-ID: <CAGVGHmuVnsw4mdsxO=93yaYRgGaj20gR0+nNB_iaS=nTM_BThw@mail.gmail.com>
Date:	Wed, 12 Oct 2011 18:53:51 +0200
From:	Olaf van der Spek <ml@...pek.org>
To:	netdev@...r.kernel.org
Subject: Seamless Service Restart / Port Takeover

Hi,

When restarting a service, a webserver for example, you'd like this to
be seamless for clients. Often, first a signal is send to the old
process to close listening sockets, then the new process is started.
This has both a race condition (sometimes 'avoided' with a sleep in
between) and service interruption.
Wouldn't it be possible to introduce mv / move like behaviour, where
the socket can be rebound without races and without interruption?

Olaf
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