Hello!

On Wed, Feb 06, 2013 at 11:23:24AM +0800, 李文伟 wrote:

> hi：
> now i am looking for a 50x retry method, config like this:
>
>
>
> upstream jboss8080 {
> server 10.1.2.164:8080 weight=1 max_fails=1
> fail_timeout=2s;
> server 10.1.2.174:8080 weight=1 max_fails=1
> fail_timeout=2s;
> server 10.1.2.209:8080 weight=1 max_fails=1
> fail_timeout=2s;
> server 10.1.7.136:8080 weight=1 max_fails=1
> fail_timeout=2s;
> server 10.1.7.137:8080 weight=1 max_fails=1
> fail_timeout=2s;
> server 10.1.7.138:8080 weight=1 max_fails=1
> fail_timeout=2s;
> }
>
> server {
> ........
> location / {
> proxy_next_upstream http_500 http_502 http_503 http_504 timeout error
> invalid_header;
> .......
> if ( !-f $request_filename ) {
> proxy_pass http://jboss8080;
> break;
> }
> }
>
> error_page 500 502 503 504 /50x.html;
> location = /50x.html {
> root html;
> }
> }
>
>
> then how proxy_next_upstream control retry times.

Quote from http://nginx.org/r/upstream:

: If an error occurs when communicating with the server, a request
: will be passed to the next server, and so on until all of the
: functioning servers will be tried. If a successful response could
: not be obtained from any of the servers, the client will be
: returned the result of contacting the last server.

That is, errors are handled as they appear, and there is no
retry-specific controls except proxy_next_upstream itself. In a
worst case all servers will be tried.

> by the way, i used error_page, config like this:
>
>
> upstream backend {
> server localhost:8080 weight=5;
> }
>
> upstream backup1 {
> server localhost:8081 weight=5;
> }
>
> upstream backup2 {
> server localhost:8082 weight=5;
> }
>
> server {
> listen 80;
> server_name localhost;
> proxy_intercept_errors on;
>
> location / {
> error_page 502 @backup1;
> proxy_pass http://backend;
> }
>
> location @backup1 {
> error_page 502 @backup2;
> proxy_pass http://backup1;
> }
>
> location @backup2 {
> proxy_pass http://backup2;
> }
> }
>
> @backup1works, but @backup2 doesn't.
> how can i let backup2 works.

http://nginx.org/r/recursive_error_pages

--
Maxim Dounin
http://nginx.com/support.html

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