Nginx location+proxy_pass?

Server NGINX
1

Hi All

I’m trying to move a bunch of rails apps from an apache/fastcgi
platform to nginx/mongrel_cluster.

What I want is something like this;

http://my.server/app1 --> mongrel_cluster1

http://my.server/app2 --> mongrel_cluster2

I can do this in nginx with something like this;
…
upstream mongrel_cluster1 {
server 127.0.0.1:3001;
server 127.0.0.1:3002;
}

upstream mongrel_cluster2 {
  server 127.0.0.1:4001;
  server 127.0.0.1:4002;
}

server {
…
location /app1 {
proxy_pass http://mongrel_cluster1;
break;
}

location /app2 {
  proxy_pass http://mongrel_cluster2;
  break;
}

…

But, the problem is that I’m now hitting my rails apps with paths like
this;

/app1/controller/method

/app2/controller/method

…when the apps want the paths to be just /controller/method

So, I want to use something like this to remove the ‘app1’ part;

rewrite ^/app1/(.*)$ /$1 permanent;

But, that seems to override the proxy_pass directive, because if I put
that in my location blocks, I just get 404 errors, and it’s not
allowed in my upstream blocks.

I know I could use virtual hosts, with a different subdomain for each
app, but that would be this;

http://app1.my.server --> mongrel_cluster1

http://app2.my.server --> mongrel_cluster2

…which is not what I want.

Is there any way to achieve what I want, using nginx?

Thanks in advance for any help.

David

2

On Friday 19 October 2007, David S. wrote:

}
  break;

I know I could use virtual hosts, with a different subdomain for each
Thanks in advance for any help.

David

proxy_pass http://mongrel_cluster1/app1

3

On 19/10/2007, Roxis [email protected] wrote:

proxy_pass http://mongrel_cluster1/app1

Thanks, but that’s not quite what I want. I’m trying to remove the
‘app1’ part before the request gets to the mongrel cluster. Also, the
line above results in the error;

"proxy_pass" may not have URI part in location given by regular

expression

Actually, I think I’ve solved the initial problem. Instead of;

rewrite ^/app1/(.*)$ /$1 permanent;

…it should be;

rewrite ^/app1/(.*)$ /$1;

This does what I want - rewrites the URL but continues processing so
that it hits the proxy_pass directive on the next line.

Thanks again

David

4

location /app1/ {
proxy_pass http://mongrel_cluster1/;
}

location /app2/ {
proxy_pass http://mongrel_cluster2/;
}

5

Nope, same error message when nginx tries to parse the config. But, as
I said, removing the ‘permanent’ part does the trick.

Cheers

David

6

On Friday 19 October 2007, David S. wrote:

Nope, same error message when nginx tries to parse the config. But, as
I said, removing the ‘permanent’ part does the trick.

Cheers

David

error message says that you are using regular expression location

my nginx version: 0.6.13
and here is my full working nginx.conf:

user www;
worker_processes 1;

events {
worker_connections 1024;
}

http {

include mime.types;

upstream mongrel_cluster1 {
server 127.0.0.1:3001;
server 127.0.0.1:3002;
}

upstream mongrel_cluster2 {
server 127.0.0.1:4001;
server 127.0.0.1:4002;
}

server {
listen 127.0.0.1:80 default deferred;

location /app1/ {
    proxy_pass http://mongrel_cluster1/;
}

location /app2/ {
    proxy_pass http://mongrel_cluster2/;
}

}

}

7

You’re absolutely right - your config works perfectly for me too.

I must have screwed up with some of the other stuff in my nginx.conf.

Thanks for your help

David

8

Yep, this config file works find in Rails 1.2.x, but not work for Rails
2.1. do you know how to make it works for Rails 2.1?

David S. wrote:

You’re absolutely right - your config works perfectly for me too.

I must have screwed up with some of the other stuff in my nginx.conf.

Thanks for your help

David

9

Hi guys :),

Back then in 1987 I think (when I was born) I think that I heard some
dutch. Really helped me today when I grew older and 'm 27 (in August).

Find me on [email protected] :wink:
I’m here to stay.

Just don’t press + look around coz it’s hard with all the
technology today…

That’s it! TAK TAK!