Excerpts from James Pearson's message :
> Why can't you install Varnish on your load balancer?
These load balancers run other unrelated critical services, and Varnish cache 
is still new for us, so we find it risky to install and maintain it on those 
machines for now. 

> Have you considered replacing Apache with a dedicated load balancer, like 
> HAProxy?
We will definitely replace it with a dedicated load balancer with more 
functionality. But that takes some more testing. 
It would be nice to have a fix now and I was hoping that I missed a simple 
command to drop a connection.

> libvmod-shield may do what you want, but this seems like an XY problem - the 
> proper solution is to change your architecture.
Absolutely true! As I told in the original mail, that is our plan but that will 
take some time...

Thanks for the critical feedback :-)

And thanks to Lasse Karstensen for pointing me to this vmod, it may be the 
solution after some code change (at the moment it only works in vcl_recv, for 
us it should be activated in vcl_fetch after getting a timeout from the 
backend.)

Peter


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