問題描述：
服務器重啓之後，服務器也正常運行，發現網站訪問不了，後來查看nginx 錯誤日誌（/var/log/nginx/error.log ）
2016/05/13 10:47:32 [error] 7688#0: *8 connect() failed (111: Connection refused) while connecting to upstream, client: ****.****.****.33, server: , request: "GET url HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "****.leyue.com.cn:22080"
後來google,發現類似不少的問題，就整理了一下,基本上有以下三個原因造成這個問題的原因：
>>>php-fpm沒有安裝 >>>php-fpm沒有運行 可以用ps aux | grep 'php-fpm'，來查看. [root@dev ~]# ps aux | grep 'php-fpm' root 4570 0.0 0.1 612024 7820 ? Ss May12 0:04 php-fpm: master process (/etc/php-fpm.conf) fpmport 4571 0.0 0.0 611620 5864 ? S May12 0:00 php-fpm: pool port fpmport 4572 0.0 0.0 611620 5892 ? S May12 0:00 php-fpm: pool port ...... 如果沒有運行，使用啓動： /etc/init.d/php-fpm start >>>php-fpm隊列滿了 php-fpm.conf (/etc/php-fpm.conf)配置文件pm.max_children修改大一點,重啓php-fpm並觀察日誌情況 cd
也看到一個，端口被佔用的情況：
nginx的error日誌裏經常報錯 2011/09/27 13:03:47 [error] 17493#0: *7438996 connect() failed (111: Connection refused) while connecting to upstream, client: 180.168.109.106, server: mysite.com, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "mysite.com" 2011/09/27 13:03:48 [error] 17493#0: *7438996 connect() failed (111: Connection refused) while connecting to upstream, client: 180.168.109.106, server: mysite.com, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "mysite.com" 2011/09/27 13:03:49 [error] 17493#0: *7438996 connect() failed (111: Connection refused) while connecting to upstream, client: 180.168.109.106, server: mysite.com, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "mysite.com" php-fpm的 ERROR級別的日誌是， [27-Sep-2011 12:08:02] ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98) [27-Sep-2011 12:30:04] ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98) [27-Sep-2011 12:40:04] ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98) [27-Sep-2011 12:50:04] ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98) [27-Sep-2011 12:57:04] ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98) [27-Sep-2011 13:03:04] ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98) [27-Sep-2011 13:03:04] ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98) 偶爾出現 [26-Sep-2011 17:48:24] ERROR: ptrace(PEEKDATA) failed: Input/output error (5) [26-Sep-2011 17:49:04] ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98) [26-Sep-2011 17:49:32] ERROR: ptrace(PEEKDATA) failed: Input/output error (5) [26-Sep-2011 17:49:33] ERROR: ptrace(PEEKDATA) failed: Input/output error (5) [26-Sep-2011 17:49:42] ERROR: ptrace(PEEKDATA) failed: Input/output error (5)
原因：
ERROR: bind() for address '127.0.0.1:9000' failed: Address already in use (98)
很明顯9000端口被佔用。
3個解決辦法
1 在nginx.conf中換個php的端口試試
2 實在不行還有sock方式。
3 殺死那個佔用9000端口的程序。
2>