Thanks Joshua,
I just played with it and it is more flexible that Solaris. Linux allows
<alias> to be four characters, but Solaris only allows low numbers. I like
this:
ifconfig eth0:dbms 192.1.1.100 up
Tino's right about the ARP tables. Gotta watch that one, especially with
lower grade switches.
Rick
"Joshua D. Drake"
<jd@commandprompt To: Tino Wildenhain <tino@wildenhain.de>
.com> cc: Richard_D_Levine@raytheon.com, Chris Browne
<cbbrowne@acm.org>,
pgsql-general@postgresql.org, pgsql-general-owner@postgresql.org
11/16/2004 11:08 Subject: Re: [GENERAL] 24x7x365 high-volume ops ideas
AM
Tino Wildenhain wrote:
>Hi,
>
>On Tue, 2004-11-16 at 14:17, Richard_D_Levine@raytheon.com wrote:
>
>
>>Hi Chris and Karim,
>>
>>I haven't been following this thread, so excuse me if I suggest something
>>that has already been tossed out.
>>
>>Solaris allows multiple IP addresses to be assigned to a single NIC. I
>>just looked at the man page for Linux ifconfig but didn't see quickly how
>>to do this. If Linux doesn't allow this, the same thing can be
>>accomplished using multiple NICs per server.
>>
>>
ifconfig device:<alias> ipaddress up
For linux.
Sincerely,
Joshua D. Drake
>>We reserve a special IP for the DB server. This IP can be assigned to
the
>>NIC of the machine currently hosting the database. If you want apps to
>>connect to a different server, remove the IP from one machine and
reassign
>>it to the other. This special DB IP is assigned on top of the regular IP
>>for the machine.
>>
>>Newly connecting apps are never the wiser, but existing connections must
be
>>terminated.
>>
>>
>
>Yes, linux can do it as well. But either case beware the arp cache :-)
>There is sqlrelay which could do the switching as well without
>forcing the apps to reconnect.
>
>Regards
>Tino
>
>
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