nginx codeigniter 502 bad gateway - codeigniter

Question

The config of nginx is as follows:
server {
listen 80;
server_name www.example.com;
root /home/wwwroot/example.com;
index index.php index.html index.htm;
location / {
index index.php index.html index.htm;
}
location ~ \.php($|/) {
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_split_path_info ^(.+\.php)(.*)$;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
if (!-e $request_filename) {
rewrite ^/(.*)$ /index.php/$1 last;
break;
}
location ~ /\.ht {
deny all;
}
}
please give me some advice, thank you~

Answer 1

I finally make it right myself.
server {
listen 80;
server_name example.com;
root /home/wwwroot/example.com;
index index.php index.html index.htm;
location / {
root /home/wwwroot/example.com;
index index.php index.html index.htm;
if (!-e $request_filename) {
rewrite ^/(.*)$ /index.php/$1 last;
break;
}
}
location ~ \.php($|/) {
fastcgi_pass unix:/tmp/php-cgi.sock;
fastcgi_index index.php;
fastcgi_split_path_info ^(.+\.php)(.*)$;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
location ~ /\.ht {
deny all;
}
}

Answer 2

please add the following line to Nginx configuration file /etc/nginx/nginx.conf
http {
...
fastcgi_buffers 8 16k;
fastcgi_buffer_size 32k;
...
}
reference

Answer 3

I was also getting this error on Codeigniter + nginx but i have solved it by changing my code.
The problem is with the session. In the Session i was saving the stdClass object. When i change the value or retrieve the value from session it gives me 502 bad gateway. So i change the session value to Associative Array and then my problem is solved. I think session storage value get exceed this is why the server give the error 502 bad gateway.

Answer 4

You don't have a root in location / (this might be OK)
You haven't stated whether or not you are trying to remove index.php from the url (if you are trying to visit a URL without index.php and without the rewrite, this may lead to the 502)
You are missing some suggested params
Here is an nginx config I have running and working with CI (CentOS 6). It removes index.php from the URL. It's also SSL but you can just take that junk out if you don't need. It should at least point you in the right direction.
server {
listen 80;
server_name _;
access_log /var/www/https/logs/access.log;
error_log /var/www/https/logs/error.log;
return 301 https://www.example.com$request_uri;
}
server {
listen 443 default_server ssl;
server_name *.example.com;
ssl on;
ssl_certificate /var/www/ssl/wildcard.example.com.chained.crt;
ssl_certificate_key /var/www/ssl/wildcard.example.com.key;
ssl_verify_depth 3;
access_log /var/www/https/logs/ssl/access.log;
error_log /var/www/https/logs/ssl/error.log;
#http://mailman.nginx.org/pipermail/nginx-announce/2013/000125.html
if ($request_uri ~ " ") {
return 444;
}
location / {
root /var/www/https/;
# file doesn't exist, let CI handle it
if (!-f $request_filename) {
rewrite ^(.*) /index.php?$1 last;
}
}
location ~* ^.+.(jpg|jpeg|gif|css|png|js|ico)$ {
root /var/www/https/;
access_log on;
expires 30d;
}
location ~ \.php$ {
include fastcgi.conf;#/etc/nginx/fastcgi.conf
fastcgi_param SCRIPT_FILENAME /var/www/https$fastcgi_script_name;
}
}
/etc/nginx/conf.d/fastcgi.conf:
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_split_path_info ^(.+\.php)(.*)$;
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 PATH_INFO $fastcgi_path_info;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx/$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;
# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param REDIRECT_STATUS 200;
fastcgi_connect_timeout 60;
fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;
fastcgi_intercept_errors on;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;