High availability virtual ip

[Itay Donenhirsch]

Hi Michael,

I wonder - what test scenario did you run on Linux-HA? I tried to used
it for floating IPs and cluster resources, it gives the illusion that
it works ok but when you start testing it a bit more you see
catastrophes. I even submitted a few bugs to their team and one
response that I got is "oh well, never tested this". That for instance
is for switch power down.

>From my experience, the CRM (if I remember correcly) algorithm is very
buggy - it's "fun" to see the linux-ha segfaults all of the sudden
with no apparent reason...

Furthermore, what version did you work with?

About LVS - it's primarly for load-balancing, using a director server
and "real servers", I used linux-ha for backup servers (n+1
configuration).

Itay


On Wed, Jun 24, 2009 at 7:10 AM, Michael Tewner<tewner at gmail.com> wrote:
> Hi all -
>
> If all you want to do is float an IP, Linux-HA will work, but a simpler
> solution could be, say, keepalived and vrrpd.
>
> I you would like to also manage cluster resources, Linux-HA is your best
> solution. I would agree that it has a steep learning curve, and it's a pain,
> but it does exactly what you want, and more. It will handle all of your
> cluster resources - We've used it for MySQL, DRBD, OCFS2, Asterisk, and
> others.
>
> Other options include virtualMonkey and/or Linux Virtual Server
>
> ...But I would NOT agree with Itay's "I would recommend not using Linux-HA
> for any means." Linux-HA is the PROPER open solution to clustering, and just
> 'cause it's hard to figure out doesn't mean that you should choose a less
> appropriate product.
>
> Check:
> http://www.ntua.gr/lvsp/Joseph.Mack/HOWTO/LVS-HOWTO.failover.html
>
> -Mike
>
>
> On Tue, Jun 23, 2009 at 5:04 PM, Maxim Veksler <hq4ever at gmail.com> wrote:
>>
>> On Tue, Jun 23, 2009 at 9:01 AM, Itay Donenhirsch <itay at bazoo.org> wrote:
>> >
>> > Hi Folks,
>> >
>> > I would recommend not using Linux-HA for any means. I had very bitter
>> > experience with it. It is implemented in a very complicated and hard
>> > to debug and configure. It's also very poorly tested. I first didn't
>> > believe it myself and thought I was doing something wrong, but after
>> > some email exchanges with its developer it became apparent that it
>> > fails some very basic scenarios (like switch power-down for instance).
>> > Moreover, the linux-ha people themselves will confuse you with which
>> > version to use (2.99/2.1.4, heartbeat or pacemaker, etc).
>> >
>> > If you'd like more detailed explanation, or had different experience,
>> > you are more than welcome to email me.
>> >
>>
>> Heartbeat has 2 faces, It can work great or it can fail bitterly.
>> It has a very steep learning curse before something useful begins to
>> happen.
>>
>> cibadmin -Q, crm_attribute are your friends.
>>
>> I agree with Itay, from our experience it is indeed buggy but working.
>>
>>
>> Maxim.
>>
>> > Itay
>> >
>> > On Tue, Jun 16, 2009 at 9:55 PM, Oleg Goldshmidt<pub at goldshmidt.org>
>> > wrote:
>> > > Marc Volovic <marcvolovic at me.com> writes:
>> > >
>> > >> Hi
>> > >>
>> > >> First, the problem is not an IP, but the mac-ip mapping and ARP
>> > >> caching strategies.
>> > >>
>> > >> Second, don't use ping.
>> > >>
>> > >> Third, do use project 'heartbeat' and 'fake'. They provide what you
>> > >> need.
>> > >
>> > > Heartbeat is a component of Linux-HA, which is why I pointed to the
>> > > latter ;-)
>> > >
>> > > http://www.linux-ha.org/Heartbeat
>> > >
>> > > --
>> > > Oleg Goldshmidt | pub at goldshmidt.org
>> > >
>> > > _______________________________________________
>> > > Linux-il mailing list
>> > > Linux-il at cs.huji.ac.il
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>> > >
>> >
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>>
>>
>> --
>> Cheers,
>> Maxim Veksler
>>
>> "Free as in Freedom" - Do u GNU ?
>>
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>