nginx.conf

user www-data;
worker_processes 1;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    server_tokens off;

    server_names_hash_bucket_size 32;

    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    gzip on;
    gzip_disable "msie6";

    # elasticsearch reverse proxy
    server {
        listen 5200;
        server_name elasticsearch.frontend;
        location / {
            proxy_pass                 <address of elasticsearch, eg: http://127.0.0.1:9200, you have to set elasticsearch not to listen on every address by setting netword.bind_host: 127.0.0.1, see more: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/modules-network.html>;
            proxy_set_header           X-Real-IP   $remote_addr;
            proxy_set_header           X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_set_header           X-Forwarded-Proto  $scheme;
            proxy_set_header           X-Forwarded-Server  $host;
            proxy_set_header           X-Forwarded-Host  $host;
            proxy_set_header           Host  $host;

            # this is one the tricks, we should hide elasticsearch's header,
            # because it returns asterisk which isnt allowed in cors request with authorization
            proxy_hide_header 'Access-Control-Allow-Origin';

            add_header 'Access-Control-Allow-Origin' '<url of grafana>';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE';
            add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type';
            add_header 'Access-Control-Allow-Credentials' 'true';
        
            if ($request_method = 'OPTIONS' ) {
                # if request method is options we immediately return with 200 OK.
                return 200;
            }
            
            # here comes the basic auth, after the options part
            auth_basic            'Restricted';
            auth_basic_user_file  <htpasswd file location>;
            
            # trick number two: elasticsearch rest api follows rest conventions, so it returns on
            # first save 201 Created response, but in cors it's not allowed
            # we are resetting status to 200 if it's 201 using lua
            header_filter_by_lua "
                if ngx.status == 201 then
                    ngx.status = ngx.HTTP_OK
                end
            ";
        }
    }

    # grafana hosting
    server {
        listen 5100;
        auth_basic            'Restricted';
        auth_basic_user_file  <location of htpasswd file>;
        location / {
            root <location of grafana src>;
        }
    }

    # graphite reverse proxy
    server {
        listen 5000;
        server_name graphite.frontend;

        location / {
            proxy_pass                 <address of graphite, eg: http://127.0.0.1:8000>;
            proxy_set_header           X-Real-IP   $remote_addr;
            proxy_set_header           X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_set_header           X-Forwarded-Proto  $scheme;
            proxy_set_header           X-Forwarded-Server  $host;
            proxy_set_header           X-Forwarded-Host  $host;
            proxy_set_header           Host  $host;

            add_header 'Access-Control-Allow-Origin' '<url of grafana>';
            add_header 'Access-Control-Allow-Methods' 'GET, POST';
            add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type';
            add_header 'Access-Control-Allow-Credentials' 'true';
        
            if ($request_method = 'OPTIONS' ) {
                # if request method is options we immediately return with 200 OK.
                return 200;
            }
            
            # here comes the basic auth, after the options part
            auth_basic            'Restricted';
            auth_basic_user_file  <htpasswd file location>;
        }
    }
}

notes.md

These config is using luascripting. So you have to compile nginx with luascripting. Or if you are using install with apt: sudo apt-get install nginx nginx-extras