Re: Pen for pure fail over setup?

From: Dominic Marks <>
Date: Sun, 26 Mar 2006 16:45:31 +0100

Dominic Marks wrote:
> Ulric Eriksson wrote:
>> On Sun, 26 Mar 2006, Dominic Marks wrote:
>>> Hello,
>>> A quick question on pen's weighting feature which I couldn't find the
>>> answer to in the documentation. Can pen be configured with two
>>> servers to direct requests so that the first server will always
>>> receive requests if available and the second server used if the
>>> primary server is down.
>>> I'd like to run pen in front of apache so I can restart / shut down
>>> apache any time I like and have pen deliver any incoming requests to
>>> a static html site being served by another lightweight httpd
>>> (probably thttpd) with a 'down for maintainence' message.
>> Specify an "emergency" server using the -e option.
>> -e host:port
>> host:port specifies the emergency server to contact
>> if all regular servers become unavailable.
>> So you run pen something like this:
>> pen 80 www1:80 -e www2:80
>> Pen will send everything to www1 until it goes down, and then it will
>> automatically blacklist www1 and send everything to www2 instead.
>> Ulric
> Perfect Ulric. I should have seen that. I did read the manual page,
> obviously not very well though!
> I see that I can use the -b option to configure how long pen will wait
> before retrying the primary server. This is exactly what I need.
> Thanks for pen :)

Any clues why pen might think that was an invalid IP address
for the emergency option?

ws# pen -Q -n -b 5 -f <external ip>:80 -e
unknown or invalid address [-e]

8890 is apache, 8880 is thttpd.

> Dom

Received on Sun Mar 26 2006 - 17:45:36 CEST

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