The answer to the original post is "It's not HA, it's MA, however..."
Middle-Availability is not high-availability, of course, but it's a good
start.
HA is a very nice buzz word. HA should protect you against what? software
failure? OS failure? hardware failure? network
On 15 April 2010 17:50, guy keren wrote:
>
> and - test test test.
>
> many people fail to test their "highly-available" setup, and as a result,
> think they are 'highly available" when they are not.
Great point!
Earlier at my current position we failed to test that the fail-over
works on on
Marc Volovic wrote:
A number of issues:
First - what. You need to replicate (a) links, (b) storage, (c) service
machines.
Links are internal and external. Multipath internet connexions.
Multipath LAN connexions. Multipath storage links. Redund network
infrastructure (switches, routers, fire
u should be, if you "go big" and start
>> high-availability-ing your stuff - you need to understand what you're doing)
>> - I've learned that most of the time, a downtime of a Linux system is due
>> to... hardware issues;
>>
>
>
> Obviously you h
A number of issues:
First - what. You need to replicate (a) links, (b) storage, (c)
service machines.
Links are internal and external. Multipath internet connexions.
Multipath LAN connexions. Multipath storage links. Redund network
infrastructure (switches, routers, firewalls, IDS/IPS).
and redundant shared storage
et al. so not even the backplane of the SAN box or the network
interface is a SPoF).
Putting the front end in a virtual server adds to its isolation from
the rest of the system since it is more likely to be the target for an
attack, but it won't help high availability
On Apr 15, 2010, at 7:53 AM, shimi wrote:
Using Linux more than a decade, I can say that if you're competent
enough as a system administrator (which you should be, if you "go
big" and start high-availability-ing your stuff - you need to
understand what you're doing)
ighly available or might it be what's some may
> call "partially highly available J"?
>
>
>
Using Linux more than a decade, I can say that if you're competent enough as
a system administrator (which you should be, if you "go big" and start
high-availabil
I guess this is more a theological question.
Would you build a web site infrastructure that needs to be highly available
using a single machine where the front end servers are virtual servers?
Is this even considered highly available or might it be what's some may
call "partially highly avail
2009/6/24 Oleg Goldshmidt :
> 3) Allow me to take the claims of "too steep learning curve" with a
> grain of salt. The last time I recall (a year, maybe less, ago) it
> took a *competent* person a few hours from "never heard of Linux-HA"
> to reading the docs, installing and configuring it, integra
2009/6/24 Michael Tewner :
> 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.
Doesn't vrrpd require cooperation from the switch?
>
> I you would like to also manage cluster resources, Linux-HA is your best
> solut
2009/6/24 Michael Tewner :
> 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 MyS
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
Well, you can not trust an HA system that either works great or fails
bitterly :) Someone told me that it was primarily designed for 1+1
systems, but I don't believe it can do this task as well.
On Tue, Jun 23, 2009 at 4:04 PM, Maxim Veksler wrote:
> On Tue, Jun 23, 2009 at 9:01 AM, Itay Donenhirs
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
On Tue, Jun 23, 2009 at 9:01 AM, Itay Donenhirsch 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 i
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
i used fake and it is working very well, thanks all
On 6/16/09, Oleg Goldshmidt wrote:
> Marc Volovic 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'. The
the problem?
yahav
From: Alex Shnitman [mailto:alext...@yahoo.com]
Sent: Wednesday, June 17, 2009 12:43 PM
To: Biran, Yahav (Yahav); linux-il@cs.huji.ac.il
Subject: Re: High availability virtual ip
Hi,
Linux-HA is one solution, as has been
From: "Biran, Yahav (Yahav)"
To: linux-il@cs.huji.ac.il
Sent: Tuesday, June 16, 2009 6:58:02 PM
Subject: High availability virtual ip
i have two linux machines, that are running on the same LAN.
i would like to find a way to set HA IP.
i was thinking on creating virtual ip that
Marc Volovic 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
latt
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.
M
---MAV
Marc. Volovic
+972-54-467-6764
m...@swiftouch.com
Sent from my iPhone
On Jun 16, 2009, at 6:
2009/6/16 Biran, Yahav (Yahav) :
> i have two linux machines, that are running on the same LAN.
> i would like to find a way to set HA IP.
> i was thinking on creating virtual ip that will ride on the exiting eth.
> lets say 10.0.0.1 and 10.0.0.2 and the VIP will be 172.16.4.1
> both will run an in
i have two linux machines, that are running on the same LAN.
i would like to find a way to set HA IP.
i was thinking on creating virtual ip that will ride on the exiting eth.
lets say 10.0.0.1 and 10.0.0.2 and the VIP will be 172.16.4.1
both will run an infinite loop of:while (ping 172.16.4.1) do .
Next Monday, 25th of June, at 18:30 the Haifa Linux Club, will gather to
hear Guy Keren talk about
High-Availability clusters on Linux and other systems
Abstract:
* what are high-availability clusters
* how they work
* what cluster software is available for linux
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