在阿里云新装了一个 PHP 程序， nginx 日志一直报 error，是被黑了么？

[microget]

PHP 门外汉，程序是 github 官方下的，装了个国人的 zh 语言包， centos,yum 安装的环境。

日志中 www.0123456.com 指代我的域名， abcdef.aa2.cn 前面的 abcdef 是指代，真实的字符串会 cname 到我的域名。
请求一分钟 10 次左右,client 的 IP 大概有好几个在变换。
-------------------------其中一段 nginx 日志----------------------------------------------

PHP message: PHP Warning: Unknown: Failed to write session data (files ). Please verify that the current setting of session.save_path is correct (/var/lib/php/session ) in Unknown on line 0" while reading upstream, client: 27.221.20.24, server: www.123456.com, request: "GET /jiecao/2013/0625/1322.html HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn", referrer: "http://abcdef.aa2.cn/jiecao/2013/0625/1322.html"

2015/08/19 00:26:37 [error] 24539#0: *1178 FastCGI sent in stderr: "PHP message: PHP Warning: session_start (): open (/var/lib/php/session/sess_8bc7claol3gq9b0p4scob8tp11, O_RDWR ) failed: Permission denied (13 ) in /www/.../app/users.php on line 146" while reading response header from upstream, client: 220.181.108.152, server: www.123456.com, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.123456.com"

2015/08/19 00:26:37 [error] 24539#0: *1178 FastCGI sent in stderr: "PHP message: PHP Warning: Unknown: open (/var/lib/php/session/sess_8bc7claol3gq9b0p4scob8tp11, O_RDWR ) failed: Permission denied (13 ) in Unknown on line 0


-----------------------------------------------------------------------
查到域名所属信息是这个。
http://whois.chinaz.com/reverse?host=+aa2.cn&ddlSearchMode=0

这可能是什么情况呢？

[wdd2007]

不是啊。是你 session 目录没有权限啊。。。

[microget]

@wdd2007 是爬虫的性质？他这么做的目的是什么？
程序安装好后，配置里面的默认域名好像是 abcdef.aa2.cn ，没在意就直接改成自己的。

[Starduster]

= =是你这网站某个功能需要 PHP 的 session ，而你的 PHP 进程没有那个目录（/var/lib/php/session ）的权限，他就在不停的报错，那么每个访问你网站的用到这个功能的人都会触发一次这个 error
检查你的目录权限和 PHP CGI 进程管理器的属主到底是谁

[microget]

@Starduster
变换 client IP,请求一个不存在的 url （日志中的 /jiecao/2013/0625/1322.html ） ，这是爬虫性质的行为？
可是 host 和 referrer 都不对，很容易被发现并处理啊。

另，有了解这个 aa2.cn 域名背后的主人这么做，是属于什么模式的买卖么？

[microget]

虽然我已经把 php-fpm 停了，但请求一直在持续。对这种行为的动机不是很理解- -!
-------------------
2015/08/19 11:53:53 [error] 24539#0: *4069 connect () failed (111: Connection refused ) while connecting to upstream, client: 120.52.18.45, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:53:53 [error] 24539#0: *4071 connect () failed (111: Connection refused ) while connecting to upstream, client: 120.52.18.45, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:54:50 [error] 24539#0: *4073 connect () failed (111: Connection refused ) while connecting to upstream, client: 120.52.18.45, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:54:50 [error] 24539#0: *4075 connect () failed (111: Connection refused ) while connecting to upstream, client: 120.52.18.45, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:56:30 [error] 24539#0: *4077 connect () failed (111: Connection refused ) while connecting to upstream, client: 222.73.144.32, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:56:30 [error] 24539#0: *4079 connect () failed (111: Connection refused ) while connecting to upstream, client: 222.73.144.32, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:56:46 [error] 24539#0: *4081 connect () failed (111: Connection refused ) while connecting to upstream, client: 125.88.189.21, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:56:46 [error] 24539#0: *4083 connect () failed (111: Connection refused ) while connecting to upstream, client: 125.88.189.21, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:57:16 [error] 24539#0: *4085 connect () failed (111: Connection refused ) while connecting to upstream, client: 125.88.189.21, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"

2015/08/19 11:57:16 [error] 24539#0: *4087 connect () failed (111: Connection refused ) while connecting to upstream, client: 125.88.189.21, server: www.123456.com, request: "HEAD / HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "abcdef.aa2.cn"