current state?

[David Lang]

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create your own heartbeat circuit, don't count on an existing service.

a couple ways to do this.

1. dedicated link (serial, ethernet, whatever) between the two machines.

2. use the existing network connections and have the HA IP be an alias.

the problem wiht #2 is that network loads may interfere with the
heartbeat, causing each machine to think that the other is down.

once the other machine is detected to be down you will need to configure
the IP address (either reconfigure the primary eithernet port or setup an
alias) and then send out an ARP packet so that all other machines update
their ARP tables. (gratuitus ARP is the correct term IIRC)

My personal reaction would be to have the HA IP be an alias so that bothe
machines are reachable at all times for maintinance, updates, etc.

David Lang


On Fri, 4 Sep 1998, Amit wrote:

> Date: Fri, 4 Sep 1998 05:17:10 -0700 (PDT)
> From: Amit <samesun@yahoo.com>
> To: linux-ha@muc.de
> Subject: Re: current state?
> 
> 
> Hi, 
> 
>   I Just tried to boot Linux in a HW configuration Reqd. for Linux HA.
> Pl. tell me what should be properties of IP takeover program. so that
> Linux-HA can be used reliably & Officially.
> 
>   I guess I can write some code to check weather some server is
> working on some port(http,ftp) and depending on the result can use
> shell script to change Server's IP. Will some one through some light
> on what should be the capabilities of the IP changeover program!
> 
> 
> Thanks.
> Amit Gupta.
> 
> 
> 
> ---Jonas Vis <jonas@frungy.se> wrote:
> >
> > Can anybody tell me something about the current state of the LINUX-HA
> > project ?
> > What have ben done and what has to be
> > 
> > 
> > 
> > 
> > 
> >             Thanks in advance
> > 
> > 
> > 
> > 
> >                 Jonas Vis
> > 
> > 
> > 
>  
> _________________________________________________________
> DO YOU YAHOO!?
> Get your free @yahoo.com address at http://mail.yahoo.com
> 
> 

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