Simple Configuration Nginx and Varnish - nginx

Question

I have 3 computers on same network(LAN). And I want to configure one computer as Nginx Web-Server, and another as Varnish Cache server and one client . I succesfully installed one(let's say A) Nginx ( 192.168.0.15 ) and B Varnish( 192.168.0.20 ). I configured A as a webserver and I can browse the index.html from other computers. But I couldn't connect it with B.
I messed up with "nginx.conf" and "/sites-available/server.com" and Varnish's "default.vcl"
Could you give me the basic configurations which suit my environment ?
If you want to take a look
My nginx.conf :
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
keepalive_timeout 65;
#gzip on;
include /etc/nginx/conf.d/*.conf;
upstream dynamic_node {
server 1.1.1.1:80; # 1.1.1.1 is the IP of the Dynamic Node
}
server {
listen 81;
server_name myserver.myhome.com;
location / {
#root /var/www/server.com/public_html;
#index index.html index.htm;
# pass the request on to Varnish
proxy_pass http://192.168.0.20;
# Pass a bunch of headers to the downstream server.
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_redirect off;
}
}
}
/sites-available/server.com :
server {
listen 80;
server_name myserver.myhome.com;
access_log /var/www/server.com/access.log;
error_log /var/www/server.com/error.log;
}
And default.vcl like this :
backend web1 {
.host = "192.168.0.15";
.port = "8080";
}
sub vcl_recv {
if (req.http.host == "192.168.0.15") {
#set req.http.host = "myserver.myhome.com";
set req.backend = web1;
}
}
Lastly /etc/default/varnish :
DAEMON_OPTS="-a :6081 \
-T localhost:6082 \
-f /etc/varnish/default.vcl \
-S /etc/varnish/secret \
-s malloc,256m"
Thanks in advance :)

Answer 1

right now, your varnish instance is listening on port 6081. This needs to be specified in the proxy_pass for nginx e.g.
proxy_pass http://192.168.0.20:6081
I am assuming that the ip addresses you mentioned are correct and network connection between the computers is not restricted.
Update
Please bear in mind that you can use nginx in front of varnish or the other way around. Both nginx and varnish can serve as proxies to back end services.
Your current implementation is using nginx as the proxy. This means that you can rely on proxy_pass or use upstream module in nginx (in case you wish to load balance behind with multiple varnish instances with just one nginx in front). Essentially, whichever is the proxy, the ip address and port number for the backend specified in the proxy (nginx in your case) must match the ip address and port number for the backend service (varnish in your case). The backend in varnish would need to match the ip address and port number for whichever application server/service you are using (tomcat/netty/django/ror etc.).