Nginx 502 Bad Gateway solution
1.FastCGI take long time, you need add this configs to nginx.conf fastcgi_connect_timeout 300; fastcgi_send_timeout 300; fastcgi_read_timeout 300; 2 FastCGI Buffer not enough, add to nginx.conf fastcgi_buffer_size 32k; fastcgi_buffers 8 32k; 3. Proxy Buffer not enough, add to nginx.conf proxy_buffer_size 16k; proxy_buffers 4 16k; 4. php-fpm log size more then 2G