How to use keepalive with Nginx revers proxy?

Server NGINX
1

Hi,

Can some one provide me an example to set keep alive connection between
Nginx(reverse proxy) and backend server?

I can not use upstream module as my backend IP is dynamic based on
variable. So I can not use keepalive directive of upstream.

I have used below directive in location block.
proxy_pass http://$IP ;

Thanks,
Makaikol

2

Hello!

On Wed, Apr 02, 2014 at 06:55:42PM +0530, Makailol C. wrote:

Hi,

Can some one provide me an example to set keep alive connection between
Nginx(reverse proxy) and backend server?

I can not use upstream module as my backend IP is dynamic based on
variable. So I can not use keepalive directive of upstream.

I have used below directive in location block.
proxy_pass http://$IP ;

Use of keepalive connections require upstream{} block to be
defined, see here for examples:

http://nginx.org/r/keepalive

As long as list of backend ip addresses is limited, you may define
appropriate upstream{} blocks for each backend, and use upstream’s
name in a variable, e.g.:

upstream backend1 {
    server 192.168.0.1;
    keepalive 2;
}

...

map $IP $backend {
    192.168.0.1  backend1;
    ...
}

location / {
    proxy_pass http://$backend;
    proxy_http_version 1.1;
    proxy_set_header Connection "";
}

–
Maxim D.
http://nginx.org/

3

Hi Maxim,

Thanks for reply.

Number of IPs are not fixed so it is not possible to define upstream and
map block I think. I am trying to implement completely dynamic
configuration using lua module.

Is it possible to use variable in upstream block like this?
upstream backend {
server $IP;
keepalive 2;
}

location / {
proxy_pass http://backend;
proxy_http_version 1.1;
proxy_set_header Connection “”;
}

Thanks,
Makailol

4

I have the same question, any update on it. I am using Lua and Redis for
the
reverse proxy lookup and don’t define upstream. How can we use
keepalive?

Posted at Nginx Forum:

5

Hello!

On Thu, Apr 03, 2014 at 09:31:08AM +0530, Makailol C. wrote:

upstream backend {
server $IP;
keepalive 2;
}

No, this won’t work.

Nginx(reverse proxy) and backend server?
Module ngx_http_upstream_module
…
}

–
Maxim D.
http://nginx.org/

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nginx Info Page

–
Maxim D.
http://nginx.org/

6

Hello!

On Sun, Dec 13, 2015 at 09:28:27PM -0500, winghokwan wrote:

I have the same issue. I use Lua and Redis for the reverse proxy lookup and
don’t use upstream. How to use keepalive then?

The only way now is to define upstream{} blocks in advance, and
then provide appropriate upstream{} block name from your dynamic
lookup code.

–
Maxim D.
http://nginx.org/

7

I have the same issue. I use Lua and Redis for the reverse proxy lookup
and
don’t use upstream. How to use keepalive then?

Posted at Nginx Forum: