nginx conditional proxy pass with different context

Question

My problem is that i have several primary servers like:

192.168.0.100/service
192.168.0.101/service

and one backup server like:

192.168.0.102/serviceInternal

Nginx is listening on:

192.168.0.200:8000

Config file looks like:

upstream sth {
         server 192.168.0.100:8001; #primary server
         server 192.168.0.101:8001; #primary server
         server 192.168.0.102:8001 backup; #backup server
}

server {
         listen   192.168.0.200:8000;

         location /service {
                 if ( primary_servers = up ) {
                        proxy_pass sth/service;
                 }
                 if ( primary_servers = down ) {
                        proxy_pass sth/serviceInternal;
                 }
         }
}

I hope i presented my problem in quite clear way :)

Could you formulate a question? What is not working and what do you like to achieve? — Jasper
– Jasper, Commented May 19, 2015 at 8:06
the main problem is in conditions about primary servers. If primary servers are online i would like to forward traffic to /service endpoint if they are not online i would like to forward traffic to /serviceInternal endpoint on backup server. — widget
– widget, Commented May 19, 2015 at 8:12
Did you have a look at other questions on SA? This might help maybe? — Jasper
– Jasper, Commented May 19, 2015 at 8:14
Yes, I have searched SA and I think it is not a solution for my problem because request_body will be always the same. What I need is check primary servers if the are online or not. — widget
– widget, Commented May 19, 2015 at 8:33
If they all would be /service (not /serviceInternal) then simple proxy_pass http://sth/service; would do what you want. — Alexey Ten
– Alexey Ten, Commented May 19, 2015 at 8:36

Alexey Ten · Accepted Answer · 2015-05-19 09:11:08Z

3

I would use "fake" server for backup

upstream sth {
         server 192.168.0.100:8001; #primary server
         server 192.168.0.101:8001; #primary server
         server 127.0.0.1:8001 backup; #backup server
}

upstream sth_backup {
         server 192.168.0.102:8001;
}

# fake server for URI replace
server {
         listen 127.0.0.1:8001;
         location /service {
                 proxy_pass http://sth_backup/serviceInternal;
         }

server {
         listen   192.168.0.200:8000;

         location /service {
                 proxy_pass http://sth/service;
         }
}

answered May 19, 2015 at 9:11

Alexey Ten

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1 Comment

widget Over a year ago

wow, I'm impressed :) Really nice workaround :) Thanks a lot @AlexeyTen

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