What happens when perlbal reverse proxy backend server dies?

Can Sar csar at stanford.edu
Thu Aug 30 20:33:14 UTC 2007

Thanks! That fixed it. In general though, is there any documentation  
on the management interface?

Can Sar

On Aug 30, 2007, at 1:22 PM, Todd Lipcon wrote:

> Hi Can,
> Try adding the following to your reverse_proxy:
>   SET verify_backend =  on
> Hope that helps
> -Todd
> On Thu, 30 Aug 2007, Can Sar wrote:
>> Hi,
>> I have perlbal set up as a reverse proxy to load balance between  
>> two instances of Apache. When one of the machines is taken offline/ 
>> dies/etc. it seems that Perlbal becomes far slower at answering  
>> even a single request (no other load on the slower), and that load  
>> time goes from 1 second to 6 seconds or so. It seems to me that it  
>> tries to connect to the machine, eventually times out and then  
>> goes to the other machine but never marks the machine as down or  
>> anything else. Is this the expected behavior?
>> I would ideally like it to detect that the machine is down, not  
>> give requests to it and then eventually probe if the machine is  
>> back up after a few minutes or so. I guess having to manually re- 
>> add the machine after failure would also be ok.
>> I've tried to find documentation on the managment interface but  
>> haven't had any luck and the help command only lists commands  
>> without explaining their syntax...
>> Here's my config file:
>> CREATE POOL apache
>> SET nodefile = /etc/perlbal/nodelist.dat
>> My CREATE SERVICE dynamic
>> SET listen =
>> SET role = reverse_proxy
>> SET pool = apache
>> SET persist_backend = on
>> SET persist_client = on
>> ENABLE dynamic
>> Thanks!
>> Can Sar

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