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[nginx] multiple fallback locations (try each one)



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ramon fincken
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Joined: 03 Aug 2007
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Location: A'dam/Diemen, The Netherlands
PostPosted: Wed Nov 04, 2015 9:14 am    Post subject: [nginx] multiple fallback locations (try each one) Reply with quote
Update 1: see reply below for a much better version

This proxy setup will fetch all content from @static_svr1, and if not found (proxy_intercept_errors) it will get it from the original server @static_svr2

Feel free to chain this to have some more.

Code:
server {
        listen 80; #Port that my custom app was assigned
        server_name domain.ext www.domain.ext;
        location / {
                try_files $uri @static_svr1;
        }
        location @static_svr1{
                proxy_pass http://fallbackurl.ext;
                proxy_intercept_errors on;
                error_page 404 = @static_svr2;
        }

        location @static_svr2{
                proxy_pass http://originalurl.ext;
        }
}


A word of caution:
fallbackurl.ext != domain.ext
originalurl.ext != domain.ext

so use domain pointers on your target servers for that.


Main source:
http://linuxplayer.org/2013/06/nginx-tr...-or-server

Last edited by ramon fincken on Sat Nov 21, 2015 5:21 pm; edited 1 time in total
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PostPosted: Wed Nov 04, 2015 9:14 am    Post subject: [nginx] multiple fallback locations (try each one)
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PostPosted: Wed Nov 04, 2015 9:14 am    Post subject: [nginx] multiple fallback locations (try each one)
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ramon fincken
Site's programmer

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Joined: 03 Aug 2007
Posts: 400
Location: A'dam/Diemen, The Netherlands
PostPosted: Wed Nov 18, 2015 2:07 pm    Post subject: Re: [nginx] multiple fallback locations (try each one) Reply with quote
Here we go for multiple remote servers having multiple hostnames (so 1 sites under different hostnames on each backend server)

Code:

server {
        listen                  8001 default_server;
        server_name             user_local;
        location / {
               root /home/user/www;
        }
}

server {
        listen                  8002 default_server;
        server_name             web1.example.com;
        location / {
                proxy_pass                      http://web1.local:80;
                proxy_set_header        Host    web1.local:80;
        }
}

server {
        listen                  8003 default_server;
        server_name             web2.example.com;
        location / {
                proxy_pass                      http://web2.local:80;
                proxy_set_header        Host    web2.local:80;
        }
}

server {
        listen                  8004 default_server;
        server_name             web3.example.com;
        location / {
                proxy_pass                      http://web3.local:80;
                proxy_set_header        Host    web3.local:80;
        }
}

upstream main {
        server 127.0.0.1:8001;
        server 127.0.0.1:8002;
        server 127.0.0.1:8003;
        server 127.0.0.1:8004;
}

server {
        listen                  80;
        server_name             example.com;
        location / {
                proxy_pass      http://main;
                proxy_next_upstream     error timeout invalid_header http_500 http_502 http_503 http_404;
        }
}



Sources:
http://serverfault.com/questions/598202...seproxying
http://stackoverflow.com/questions/1324...e-backends
http://stackoverflow.com/questions/1286...oesnt-work
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