Re: [Xen-devel] [PATCH v7 2/8] cxenstored: add support for systemd active sockets

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Fri, Jul 18, 2014 at 12:28 AM, Luis R. Rodriguez
<mcgrof@xxxxxxxxxxxxxxxx> wrote:
> From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
>
> This adds systemd socket activation support for the C xenstored.
> Active sockets enable xenstored to be loaded only if required by a system
> onto which Xen is installed on. Socket activation is handled by
> systemd, once a port for a service which claims a socket is used
> systemd will start the required services for it, on demand. For more
> details on socket activation refer to Lennart's socket-activation
> post regarding this [0].
>
> Right now this code adds a no-op for this functionality, leaving the
> enablement to be done later once systemd is properly hooked into
> the build system. The socket activation is ordered in aligment with
> the socket activation order passed on to systemd.
>
> [0] http://0pointer.de/blog/projects/socket-activation2.html

So with this patch in place, xenstored will not start on a system that
has systemd, *even if it wasn't started from systemd*.

Lots of systems (e.g., CentOS 7) have legacy systems in place to allow
you to do things like "chkconfig --add xencommons" even on a systemd
system.  I think we still want to work with those, right?

 -George

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