Mailing List Archive: clustering scenario help needed

clustering scenario help needed

Feb 3, 2004, 10:12 AM

Post #1 of 4 (2690 views)

Hi,

What I have is Apache & Tomcat serving a webapp. What I want to do is to
have 3 Tomcat servers, and use 1 Apache for load balancing. I have to
have sticky sessions. This introduces the Apache instance as a single
point of failure which I'm looking at how to provide redundancy. Will
mod_backhand replicate information between two Apache instances so that
if one goes down, the other can continue load balancing to the correct
server for users?

Also is it production safe ?

Any help is much appreciated.
Pete.

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clustering scenario help needed [ In reply to ]

stokesp at quinn-direct

Feb 5, 2004, 2:48 AM

Post #2 of 4 (2592 views)

Permalink

I really need some help in this so if someone could be of assistance it
would be greatly appreciated.

Pete.

Pete Stokes wrote:

> Hi,
>
> What I have is Apache & Tomcat serving a webapp. What I want to do is to
> have 3 Tomcat servers, and use 1 Apache for load balancing. I have to
> have sticky sessions. This introduces the Apache instance as a single
> point of failure which I'm looking at how to provide redundancy. Will
> mod_backhand replicate information between two Apache instances so that
> if one goes down, the other can continue load balancing to the correct
> server for users?
>
> Also is it production safe ?
>
> Any help is much appreciated.
> Pete.
>
>
> ***********************************************************************************
>
> This email and any files transmitted with it are confidential and
> intended solely for the use of the individual or entity to whom they are
> addressed. If you have received this email in error please notify the
> system manager.
> This footnote also confirms that this email message has been swept by
> MIMEsweeper for the presence of computer viruses.
> ***********************************************************************************
>
> For any information on the Quinn Group of Companies please visit :-
>
> http://www.quinn-group.com
>
>
> _______________________________________________
> backhand-users mailing list
> backhand-users@lists.backhand.org
> http://lists.backhand.org/mailman/listinfo/backhand-users
>

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clustering scenario help needed [ In reply to ]

jesus at omniti

Feb 5, 2004, 6:32 AM

Post #3 of 4 (2606 views)

Permalink

Use the bySessionID candidacy function (or write your own). Then in
your Java app, make the session handler responsible for setting a
session cookie that indicates which machine. bySessionID can read that
session cookie and deliver the user to the same machine again and
again.

I have built this solution for a past client, it works fine.

On Feb 5, 2004, at 4:48 AM, Pete Stokes wrote:

> I really need some help in this so if someone could be of assistance
> it would be greatly appreciated.
>
> Pete.
>
>
>
> Pete Stokes wrote:
>
>> Hi,
>> What I have is Apache & Tomcat serving a webapp. What I want to do is
>> to have 3 Tomcat servers, and use 1 Apache for load balancing. I have
>> to have sticky sessions. This introduces the Apache instance as a
>> single point of failure which I'm looking at how to provide
>> redundancy. Will mod_backhand replicate information between two
>> Apache instances so that if one goes down, the other can continue
>> load balancing to the correct server for users?
>> Also is it production safe ?
>> Any help is much appreciated.
>> Pete.
>> **********************************************************************
>> ************* This email and any files transmitted with it are
>> confidential and intended solely for the use of the individual or
>> entity to whom they are addressed. If you have received this email in
>> error please notify the system manager.
>> This footnote also confirms that this email message has been swept by
>> MIMEsweeper for the presence of computer viruses.
>> **********************************************************************
>> ************* For any information on the Quinn Group of Companies
>> please visit :-
>> http://www.quinn-group.com
>> _______________________________________________
>> backhand-users mailing list
>> backhand-users@lists.backhand.org
>> http://lists.backhand.org/mailman/listinfo/backhand-users
>
>
>
> ***********************************************************************
> ************
> This email and any files transmitted with it are confidential and
> intended solely for the use of the individual or entity to whom they
> are addressed. If you have received this email in error please notify
> the system manager.
> This footnote also confirms that this email message has been swept by
> MIMEsweeper for the presence of computer viruses.
> ***********************************************************************
> ************
> For any information on the Quinn Group of Companies please visit :-
>
> http://www.quinn-group.com
>
>
> _______________________________________________
> backhand-users mailing list
> backhand-users@lists.backhand.org
> http://lists.backhand.org/mailman/listinfo/backhand-users
>
// Theo Schlossnagle
// Principal Engineer -- http://www.omniti.com/~jesus/
// Postal Engine -- http://www.postalengine.com/
// Ecelerity: fastest MTA on earth

clustering scenario help needed [ In reply to ]

stokesp at quinn-direct

Feb 5, 2004, 7:29 AM

Post #4 of 4 (2655 views)

Permalink

Thanks.

Theo Schlossnagle wrote:

> Use the bySessionID candidacy function (or write your own). Then in
> your Java app, make the session handler responsible for setting a
> session cookie that indicates which machine. bySessionID can read that
> session cookie and deliver the user to the same machine again and again.
>
> I have built this solution for a past client, it works fine.
>
> On Feb 5, 2004, at 4:48 AM, Pete Stokes wrote:
>
>> I really need some help in this so if someone could be of assistance
>> it would be greatly appreciated.
>>
>> Pete.
>>
>>
>>
>> Pete Stokes wrote:
>>
>>> Hi,
>>> What I have is Apache & Tomcat serving a webapp. What I want to do
>>> is to have 3 Tomcat servers, and use 1 Apache for load balancing. I
>>> have to have sticky sessions. This introduces the Apache instance as
>>> a single point of failure which I'm looking at how to provide
>>> redundancy. Will mod_backhand replicate information between two
>>> Apache instances so that if one goes down, the other can continue
>>> load balancing to the correct server for users?
>>> Also is it production safe ?
>>> Any help is much appreciated.
>>> Pete.
>>> **********************************************************************
>>> ************* This email and any files transmitted with it are
>>> confidential and intended solely for the use of the individual or
>>> entity to whom they are addressed. If you have received this email
>>> in error please notify the system manager.
>>> This footnote also confirms that this email message has been swept
>>> by MIMEsweeper for the presence of computer viruses.
>>> **********************************************************************
>>> ************* For any information on the Quinn Group of Companies
>>> please visit :-
>>> http://www.quinn-group.com
>>> _______________________________________________
>>> backhand-users mailing list
>>> backhand-users@lists.backhand.org
>>> http://lists.backhand.org/mailman/listinfo/backhand-users
>>
>>
>>
>>
>> ***********************************************************************
>> ************
>> This email and any files transmitted with it are confidential and
>> intended solely for the use of the individual or entity to whom they
>> are addressed. If you have received this email in error please notify
>> the system manager.
>> This footnote also confirms that this email message has been swept by
>> MIMEsweeper for the presence of computer viruses.
>> ***********************************************************************
>> ************
>> For any information on the Quinn Group of Companies please visit :-
>>
>> http://www.quinn-group.com
>>
>>
>> _______________________________________________
>> backhand-users mailing list
>> backhand-users@lists.backhand.org
>> http://lists.backhand.org/mailman/listinfo/backhand-users
>>
> // Theo Schlossnagle
> // Principal Engineer -- http://www.omniti.com/~jesus/
> // Postal Engine -- http://www.postalengine.com/
> // Ecelerity: fastest MTA on earth
>
>
> _______________________________________________
> backhand-users mailing list
> backhand-users@lists.backhand.org
> http://lists.backhand.org/mailman/listinfo/backhand-users
>

***********************************************************************************
This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager.
This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses.
***********************************************************************************
For any information on the Quinn Group of Companies please visit :-

http://www.quinn-group.com