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From "DENIS Laurent" <Laurent.DE...@mail.mobistar.be>
Subject RE: [users@httpd] High availabilty through Apache httpd
Date Mon, 06 Feb 2012 12:00:03 GMT
Apache supports load-balancing, you can put several in parallel without
any problem   J

 

And it does a very nice job in load-balancing/failover for the backends
through mod_proxy_balancer (though a health-check option at HTTP level
would be welcome)

 

The problem is more with the applications you put behind it. 

 

If you have several apache that forward to several application servers
(be it PHP, Tomcat, Weblogic, Websphere, etc...) you need to make sure
that:

- one "client" always end on the same front-end apache server + that the
queries are always forwarded to the same app server (using session id) 

- or that the app server are working in a cluster to synchronize their
sessions

 

If you can afford a hardware load-balancer, do so. But even there,
you'll have to setup several such boxes in parallel one day or another,
with vrrp or hsrp or a similar protocol.

 

You can also take a look at the SRV record for DNS
(http://en.wikipedia.org/wiki/SRV_record) and pray for the browser to
support it.

 

 

 

From: Harsimranjit singh Kler [mailto:simran4u2@gmail.com] 
Sent: Monday 6 February 2012 11:46
To: DENIS Laurent
Cc: users@httpd.apache.org
Subject: Re: [users@httpd] High availabilty through Apache httpd

 

Thanks for details.

 

One last question 

 

Why Apache not Support failover support which is basic for any load
balancer setup ?

 

Any plan of HA in future releases of httpd?

On Mon, Feb 6, 2012 at 4:08 PM, DENIS Laurent
<Laurent.DENIS@mail.mobistar.be> wrote:

Basically, you have one IP address that is used by two hosts, active one
only one at a time. If one service fails, the other node take the IP
thanks to keepalived.

 

This works only if you're on the same network segment.

 

Google on "vrrp keepalived apache" and you'll get this first link:
http://www.cyberciti.biz/faq/rhel-centos-fedora-keepalived-lvs-cluster-c
onfiguration/

 

 

 

 

 

 

 

From: Harsimranjit singh Kler [mailto:simran4u2@gmail.com] 
Sent: Monday 6 February 2012 10:53
To: DENIS Laurent
Cc: users@httpd.apache.org 


Subject: Re: [users@httpd] High availabilty through Apache httpd

 

Intially i want failover setup only with two node

 

can you explain little about vrrp + keepalived.  else some reference
link how i can achive it step by step(on linux setup only)

?

On Mon, Feb 6, 2012 at 3:12 PM, DENIS Laurent
<Laurent.DENIS@mail.mobistar.be> wrote:

If you just want failover on the head apache: use two nodes with vrrp +
keepalived (if you're on linux) to monitor your service.

 

If you need load-balancing, then you should use two VRRP addresses with
DNS round-robin. But you'll stumble on client-server persistence problem
if you don't use tomcat clustering.

 

 

From: Jaco Kroon [mailto:jaco@uls.co.za] 
Sent: Monday 6 February 2012 10:24
To: users@httpd.apache.org
Cc: Harsimranjit singh Kler
Subject: Re: [users@httpd] High availabilty through Apache httpd

 

Not that I'm aware of but someone else on the list may very well know
something I don't.

May I inquire as to why not?

Kind Regards,
Jaco

On 06/02/12 11:17, Harsimranjit singh Kler wrote: 


Its is not possible for me  to use "haproxy" in my setup. Is there
alternate to use with Apache only?


 

On Mon, Feb 6, 2012 at 2:43 PM, Jaco Kroon <jaco@uls.co.za> wrote:

Hi,

Perhaps look at "haproxy" instead of apache.  Run it on two or more
machines with multiple IPs and have then distribute the load to your
Tomcat worker nodes.

Kind Regards,
Jaco 



On 06/02/12 11:09, Harsimranjit singh Kler wrote:

Hi
How i can make apache httpd High Available(HA)?.If i want to achive with
out hardware based HA.
I have httpd 2.2.17 on one Phsical Node(IP xxx.xxx.xxx) and Six Tomcat
worker on other 6 Phsical Node.Now if IP xxx.xxx.xxx goes down my
application completly down.?
regards
Harsimran

 

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