full-disclosure - Re: Server Redundancy

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Date: Sat, 12 Aug 2006 22:39:16 -0400
From: wac <waldoalvarez00@...il.com>
To: "Tim Hecktor" <th@...ainbox.de>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Server Redundancy

Hi:

Thanks I'll check ipvs.

Regards
Waldo

On 8/10/06, Tim Hecktor <th@...ainbox.de> wrote:
>
>  Hello,
>
> <Isn't there a way to map a name to several IPs?
> <Or use aliases?
>
> Maybe this is what you are looking for:
>
> pandora:~# dig ftp.freenet.de
>
> ; <<>> DiG 9.2.1 <<>> ftp.freenet.de
> ;; global options:  printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59136
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 3, ADDITIONAL: 3
>
> ;; QUESTION SECTION:
> ;ftp.freenet.de.                        IN      A
>
> ;; ANSWER SECTION:
> ftp.freenet.de.         1457    IN      CNAME   ftp-0.freenet.de.
> ftp-0.freenet.de.       600     IN      A       194.97.2.69
> ftp-0.freenet.de.       600     IN      A       194.97.2.70
> ftp-0.freenet.de.       600     IN      A       194.97.2.67
> ftp-0.freenet.de.       600     IN      A       194.97.2.68
>
> This will map a name to more than one ip and will give you load-balancing
> this way, but not real redundancy.
> To map a service to different hosts redundant you can use a box running
> ipvs. This box can be made redundant with a identical box using mon and
> heartbeat to do ip failover.
>
> Best regards,
>
> Tim Hecktor
>

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