I am having some trouble configuring Varnish and the online documentation is not very clear (for me at least). I currently have Varnish cache setup on a Ubuntu server. I tested varnish with a local Nginx on the same server and it worked fine. What i want to do is use Varnish as a cache and reverse proxy for a remote web server configured with Nginx. I need to keep the host name requested by the client and pass that to the remote Nginx web server. This can be done in Nginx using the proxy_set_header Host, and Apache by using ProxyPreserveHost On. The problem is that i have many different virtual hosts on my remote Nginx and the DNS of the server is not configured with any of them. They are all different so i need to make sure that the host requested from the client is passed through. I apologise if this is not clear but i am brand new to Varnish and it is nothing like i am used to with Apache or Nginx. Any help would be greatly appreciated.
Here is my default.vcl:
vcl 4.0;
# Default backend definition. Set this to point to your content
server.
backend default {
.host = "dns.of.remote.nginx.server";
.port = "80";
.probe = {
.url = "/";
.timeout = 30s;
.threshold = 8;
}
}
sub vcl_recv {
# Happens before we check if we have this in cache already.
#
# Typically you clean up the request here, removing cookies you
don't need,
# rewriting the request, etc.
unset req.http.Cookie;
set req.http.x-host = req.http.host;
set req.http.x-url = req.url;
set req.url = req.url;
}
sub vcl_backend_response {
# Happens after we have read the response headers from the
backend.
#
# Here you clean the response headers, removing silly Set-Cookie
headers
# and other mistakes your backend does.
}
sub vcl_deliver {
# Happens when we have all the pieces we need, and are about to
send the
# response to the client.
#
# You can do accounting or modifying the final object here.
}