Re: Nginx upstream return name instead of server ip
Got it! Thanks. Posted at Nginx Forum: https://forum.nginx.org/read.php?2,292491,292502#msg-292502 ___ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
Re: Nginx upstream return name instead of server ip
Hello! On Wed, Sep 29, 2021 at 10:41:20AM -0400, rjvbzeoibvpzie wrote: > You are right, those lines are logged (i've forced upstreams to fail by > stopping them). > > But i can't see such problem using "proxy_pass http://127.0.0.1:81; instead > of "proxy_pass http://http_backend; (no more 502 errors). > > Strange... That's because max_fails/fail_timeout are not used when only one server is available in an upstream group, and "no live upstreams" errors cannot happen. -- Maxim Dounin http://mdounin.ru/ ___ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
Re: Nginx upstream return name instead of server ip
You are right, those lines are logged (i've forced upstreams to fail by stopping them). But i can't see such problem using "proxy_pass http://127.0.0.1:81; instead of "proxy_pass http://http_backend; (no more 502 errors). Strange... Posted at Nginx Forum: https://forum.nginx.org/read.php?2,292491,292498#msg-292498 ___ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
Re: Nginx upstream return name instead of server ip
Hello! On Wed, Sep 29, 2021 at 09:43:54AM -0400, rjvbzeoibvpzie wrote: > Well, I was just assuming that no live upstreams were availbale, but this is > not the case. At least, this is not logged (access or error). The "no live upstreams" error is expected to be logged to the error log at the "error" level. If you don't see it in the error log, check your logging configuration. -- Maxim Dounin http://mdounin.ru/ ___ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
Re: Nginx upstream return name instead of server ip
Well, I was just assuming that no live upstreams were availbale, but this is not the case. At least, this is not logged (access or error). Here are the lines from access_log i'm talking about (see the difference on $upstream_addr): log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for" ' '$request_length $request_time ' '"$upstream_addr" "$upstream_response_length" "time=$upstream_response_time" "$host" "$limit_req_status"'; 208.115.199.18 - - [29/Sep/2021:12:42:43 +0200] "GET /login HTTP/1.1" 200 150 "https://example.com; "Mozilla/5.0+(compatible; UptimeRobot/2.0; http://www.uptimerobot.com/)" "-" 408 0.105 "127.0.0.1:81" "0" "time=0.000" "example.com" "PASSED" 208.115.199.18 - - [29/Sep/2021:12:43:35 +0200] "GET /login HTTP/1.1" 502 150 "https://example.com; "Mozilla/5.0+(compatible; UptimeRobot/2.0; http://www.uptimerobot.com/)" "-" 408 0.000 "http_backend" "0" "time=0.000" "example.com" "PASSED" Posted at Nginx Forum: https://forum.nginx.org/read.php?2,292491,292494#msg-292494 ___ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
Re: Nginx upstream return name instead of server ip
Hello!
On Wed, Sep 29, 2021 at 09:20:20AM -0400, rjvbzeoibvpzie wrote:
> Here is my config:
>
> -
> upstream http_backend {
> server 127.0.0.1:81;
> server 10.1.1.2 backup;
> }
>
> server {
> ...
>
> location /http/ {
> proxy_pass http://http_backend;
> ...
> }
> }
> -
>
> As long as everything is working, $upstream_addr returns the IP
> (127.0.0.1:81). But when any backend returns HTTP/502, $upstream_addr
> returns the upstream name (http_backend) as the $upstream_addr.
>
> Shouldn't this return the lastest server IP tried before failure?
The upstream name can be seen in $upstream_addr as long as nginx
is not able to select an upstream server because all servers are
not available per max_fails/fail_timeout. The "no live upstreams"
error is logged at the same time.
--
Maxim Dounin
http://mdounin.ru/
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