nginx.conf

# Config for Nginx to act as a front-end for Riak
# The main goal is to proxy all GETs directly to Riak, and disallow anything else (POST, PUT, etc)
# Also, disallow use of the map/reduce query links (i.e. /riak/bucket/key/_,_,_)

# Config is in /etc/nginx/sites-available/default or somewhere like that

# Set up load-balancing to send requests to all nodes in the Riak cluster
# Replace these IPs/ports with the locations of your Riak nodes
upstream riak_hosts {
  server  127.0.0.1:8098;
  #server  10.0.1.18:8098;
  #server  10.0.1.19:8098;
}

server {
  listen   80;
  server_name  _;
  access_log  /var/log/nginx/riak.access.log;

  # your standard Nginx config for your site here...
  location / {
    root /var/www/nginx-default;
  }

  # Expose the /riak endpoint and allow queries for keys only
  location /riak/ {
      proxy_set_header Host $host;
      proxy_redirect off;

      client_max_body_size       10m;
      client_body_buffer_size    128k;

      proxy_connect_timeout      90;
      proxy_send_timeout         90;
      proxy_read_timeout         90;

      proxy_buffer_size          64k;  # If the buffers are set to small, nginx will complain about "too large headers"
      proxy_buffers              4 64k;
      proxy_busy_buffers_size    64k;
      proxy_temp_file_write_size 64k;

    if ($request_method != GET) {
      return 405;
    }

    # Disallow any link with the map/reduce query format "bucket,tag,_"
    if ($uri ~ "/riak/[^/]*/[^/]*/[^,]+,[^,]+," ) {
      return 405;
    }

    if ($request_method = GET) {
      proxy_pass http://riak_hosts;
    }
  }
}

Thanks for this, it looks really good. There are two things I added: First, I set my server to reply with a 1x1 transparent gif to all requests for favicon.ico, since I don't have them in my apps:

#Serve an empty 1x1 gif for favicon.ico
  location = /favicon.ico {
    empty_gif;
  }

Second, I set max_fails and fail_timeout on each host in the upstream:
server host:port max_fails=3 fail_timeout=30s;

yeah, thanks for this.

I did set this up but getting a lot 502/400 errors seems to buffer problem but increasing buffers gives no help