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From:Claudio Nanni Date:February 5 2009 2:19pm
Subject:Re: Instance scale-out
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John,
I don't want to argue too much on this but I'd also like the opinion of the
big heads in MySQL

I think there's no grey area here.
An interface is an interface and can be of any type and supporting any
protocol(TCP/IP on ethernet card, UDP idem. DSL on WAN card, PPP on POTS
modem)

A port is related ONLY to the TCP/IP protocol(in this case)

Moreover, are all the *nix systems wrong?

---------------------------------------------------------------------------------------------------
[clna@terramia ~]$ man ifconfig
IFCONFIG(8)                Linux Programmer's Manual
IFCONFIG(8)

NAME
       ifconfig - configure a network interface

SYNOPSIS
       ifconfig [interface]
       ifconfig interface [aftype] options | address ...
----------------------------------------------------------------------------------------------------

So, let's see what a 'network interface' is:
----------------------------------------------------------------------------------------------------
[clna@terramia ~]$ /sbin/ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 00:1C:23:3F:CB:C0
          inet addr:10.xxx.xxx.xxx  Bcast:10.xxx.xxx.xxx  Mask:255.255.255.0
          inet6 addr: fe80::21c:23ff:fe3f:cbc0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4057947 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3932495 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:851379513 (811.9 MiB)  TX bytes:1896970616 (1.7 GiB)
          Interrupt:177
----------------------------------------------------------------------------------------------------
Aren't we supposed to see just a port number here?

Cheers
Claudio


2009/2/5 John Daisley <john.daisley@stripped>

> An interface by definition is a point of interconnection.
>
> Maybe its a bit of a grey area where the interpretation can be different
> depending on whether you think in terms of hardware or software.
>
> Its the port which is used to communicate with the MySQL (or indeed any
> other) server software so therefore for the server software (but maybe not
> the physical hardware) its the port which is the point of interconnection
> (the network interface).
>
> For me the book is correct but I can see where confusion could occur.
>
> John
>
> > Hi Claudio,
> >
> >    I don't think its your English, I agree with you that its not just
> > confusing it is wrong.
> >
> > "Each server must have its own network interface"
> >
> > At least for my 10 years experience in IT and UNIX I would understand
> > network interface as physical network interface unless specified as
> > otherwise. Maybe the MySQL community has a differenet opinion :P
> >
> >
> >
> > ;)
> >
> > cheers Andy.
> >
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Thread
Instance scale-outClaudio Nanni5 Feb
  • Re: Instance scale-outJohn Daisley5 Feb
  • Re: Instance scale-outAndy Smith5 Feb
    • Re: Instance scale-outJohn Daisley5 Feb
      • Re: Instance scale-outClaudio Nanni5 Feb
        • Re: Instance scale-outJohn Daisley5 Feb
          • Re: Instance scale-outAndy Smith5 Feb
            • Re: Instance scale-outJohn Daisley5 Feb
          • Re: Instance scale-outClaudio Nanni5 Feb
            • Re: Instance scale-outBaron Schwartz5 Feb
Re: Instance scale-outClaudio Nanni5 Feb