NGNIX - Directives (Upsteam, Location, Return)

The upstream directive

The upstream directive defines groups of servers that can be referenced by the proxy_pass, fastcgi_pass, uwsgi_pass, scgi_pass, memcached_pass, and grpc_pass directives:

   upstream testdomainapp  {
   server app1.testdomain.local:8085;
   server app2.testdomain.local:8086 backup;
   server app3.testdomain.local:8087 backup;
}

By default, requests are distributed between the servers using a weighted round-robin balancing method.

The location directive

The location directive sets configuration depending on a request URI:

location / {
        try_files $uri $uri/ =404;
}

location ~ /\.ht {
        deny all;
}

A location can either be defined by a prefix string, or by a regular expression.

The return directive

The return directive stops processing and returns the specified code to a client:

location /downloads {
        rewrite ^(/downloads)/(.*)$ http://downloads.testdomain.local:9084/$2 permanent;
        return 403;
}