informations about boot sequence (Re: F15 - mysql start problem)

[Michał Piotrowski]

2011/5/9 Lennart Poettering <mzerqung at 0pointer.de>:
> On Mon, 09.05.11 18:58, Michał Piotrowski (mkkp4x4 at gmail.com) wrote:
>
>> >> Yes, mysql and postgresql are both certainly broken by this.  Please
>> >> send the info, I'll take care of those two.
>> >
>> > I'll create bug reports and send proposed patches later.
>> >
>>
>> Patch for MySQL
>> https://bugzilla.redhat.com/show_bug.cgi?id=703214
>>
>> for PostgreSQL
>> https://bugzilla.redhat.com/show_bug.cgi?id=703215
>>
>
> Urks. I would strongly suggest not to make changes like this by
> default. These services should bind on 0.0.0.0 by default, which is
> available without network.

Ok, when it comes to me - I can fix that on my setup :)

But what about other large systems?

When it comes to systemd in F15 a few things should be documented in
F15 release notes. /run vulnerability too.

> Only if you manually configure them to bind
> on a specific IP address you need the network up and configured. But not
> even that is strictly necessary. A nice server uses netlink to subscribe
> to network changes and binds as appropriate. A simpler server could even
> invoke the IP_FREEBIND setsockopt (1-line patch), which allows them to
> listen on the addresses before the interfaces are up (which you probably
> want to do anyway, since it adds robustness and makes your server
> independent from network changes).
>
> So, instead of making mysql/postgres start up slower for everybody, i'd
> rather see this solution:
>
> a) people who manually change the IP address fo mysql to bind on
> specific ip addresses, manually also enable
> NetworkManager-wait-online.service.
>
> or:
>
> b) the servers are fixed to listen to netlink.
>
> or:
>
> c) They get fixed to use IP_FREEBIND.
>
> All three of the solutions are nicer than adding unnecessary
> dependencies for them.
>
> Lennart
>
> --
> Lennart Poettering - Red Hat, Inc.
> --
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-- 
Best regards,
Michal

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