I have a website www.mysite.com running behind a load balancer. There are two servers in the load balancer cluster. Each runs Varnish 3.0 and Apache/PHP (I know varnish could load balance for me - but we have a preference for a different LB tech).
Every now and again I need to purge an URL or two...
In my VCL I have 127.0.0.1 as a trusted URL for PURGEs. And a standard purge config:
vcl_recv:
....
if (req.request == "PURGE") {
# Allow requests from trusted IPs to purge the cache
if (!client.ip ~ trusted) {
error 405 "Not allowed.";
}
return(lookup); # @see vcl_hit;
}
...
sub vcl_hit {
if (req.request == "PURGE") {
purge;
error 200 "Purged (via vcl_hit)";
}
if (!(obj.ttl > 0s)) {
return (pass);
}
return (deliver);
}
sub vcl_miss {
if (req.request == "PURGE"){
purge;
error 404 "Not in Cache";
}
return (fetch);
}
Now from a shellscript I want to invalidate an URL.
curl -X PURGE http://127.0.0.1/product-47267.html
Doesnt work, but
curl -X PURGE http://www.mysite.com/product-47267.html
Does work. Problem here is - I need to invalidate on each local machine in cluster - not have the request go out and back in via the load balancer (because I dont know which machine will take the PURGE).
Hope this makes sense
LW