问题描述：
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服务器重启之后，服务器也正常运行，发现网站访问不了，后来查看nginx 错误日志（/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"
后来google,发现类似不少的问题，就整理了一下,基本上有以下三个原因造成这个问题的原因：
>>>php-fpm没有安装
>>>php-fpm没有运行
可以用ps aux | grep 'php-fpm'，来查看.
[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
......
如果没有运行，使用启动：
/etc/init.d/php-fpm start
>>>php-fpm队列满了
php-fpm.conf (/etc/php-fpm.conf)配置文件pm.max_children修改大一点,重启php-fpm并观察日志情况
cd
也看到一个，端口被占用的情况：
nginx的error日志里经常报错
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级别的日志是，
[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)
偶尔出现
[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)
很明显9000端口被占用。
3个解决办法
1 在nginx.conf中换个php的端口试试
2 实在不行还有sock方式。
3 杀死那个占用9000端口的程序。
2>
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