Nginx 出現 500 Error 修復 (too many open file, connection)
Nginx 出現 500 Error 修復 (too many open file, connection) Nginx 出現 500 Error, 錯誤訊息只能從 Log 查到, 有遇到下述兩種狀況:
socket() failed (24: Too many open files) while connecting to upstream $ sudo su - www-data $ ulimit -n # 看目前系統設定的限制 (ulimit -a # 可查看全部參數) 1024 # vim /etc/security/limits.conf # 由此檔案設定 nofile (nofile - max number of open files) 的大小 # 增加/修改 下述兩行 * soft nofile 655360 * hard nofile 655360 ulimit -n # 登出後, 在登入, 執行就會出現此值 655360 # 若 ulimit -n 沒出現 655360 的話, 可使用 ulimit -n 655360 # 強制設定 # 再用 ulimit -n 或 ulimit -Sn (驗證軟式設定)、ulimit -Hn (驗證硬式設定) 檢查看看(或 ulimit -a). # 從系統面另外計算 + 設定 lsof | wc -l # 計算開啟檔案數量 sudo vim /etc/sysctl.conf fs.file-max = 3268890 sudo sysctl -p 512 worker_connections are not enough while connecting to upstream # /etc/nginx/nginx.conf worker_connections 10240; # 參考 Nginx CoreModule # worker_processes 2; # worker_rlimit_nofile 10240; # events { # # worker_connections 10240; # } # Nginx 的 connection 增加後, 整體速度會變慢很多, 主要原因是 php-cgi 不夠用, 所以要作以下調整. # php-cgi was started with phpfcgid_children="10" and phpfcgid_requests="500" # ab was run on another server, connect via a switch using GBit ethernet # http://till.klampaeckel.de/blog/archives/30-PHP-performance-III-Running-nginx.html # vim /etc/nginx/nginx.conf worker_connections 10240; worker_rlimit_nofile # vim /etc/init.d/php-fcgi PHP_FCGI_CHILDREN=15 PHP_FCGI_MAX_REQUESTS=1000 改成 PHP_FCGI_CHILDREN=512 # 或 150 慢慢加, 注意 MySQL connection 是否夠用 PHP_FCGI_MAX_REQUESTS=10240 # 上述文章的 phpfcgid_stop(), 寫得還不錯, 有需要可以用看看. # phpfcgid_stop() { # echo "Stopping $name." # pids=`pgrep php-cgi` # pkill php-cgi # wait_for_pids $pids # }
