How can I access the public IP address of the client behind a DO load balancer?
Does the load balancer send any header with this IMPORTANT info? Can’t find it in my $_SERVER info array :(
thanks!
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If you use var_dump( $_SERVER ); are you not seeing X-Forwarded-For?
You’ll want to look for HTTP_X_ headers when it comes to fetching information coming from the LB, such as the proto (HTTP/HTTPS), port, and client IP.
HTTP_X_FORWARDED_PORT
HTTP_X_FORWARDED_PROTO
HTTP_X_FORWARDED_FOR
It was an NGINX config issue.
Fix here: http://stackoverflow.com/questions/25929599/nginx-replace-remote-addr-with-x-forwarded-for
You shouldn’t need to modify that specifically, unless you don’t want to check for the standard headers and want to force REMOTE_ADDR to be the value of HTTP_X_FORWARDED_FOR.
I tested this on a source compile of NGINX using the following fastcgi configuration:
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 512k;
fastcgi_buffers 512 16k;
fastcgi_busy_buffers_size 1m;
fastcgi_temp_file_write_size 4m;
fastcgi_max_temp_file_size 4m;
fastcgi_intercept_errors off;
fastcgi_param SCRIPT_FILENAME $request_filename;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param REQUEST_SCHEME $scheme;
fastcgi_param HTTPS $https if_not_empty;
fastcgi_param HTTP_PROXY "";
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
fastcgi_param REDIRECT_STATUS 200;
The above is what would normally be in the fastcgi_params file.