nginx lua脚本操作文件目录或者文件的默认路径的坑

时间：2020-05-23 13:16:21 阅读：302 评论：0 收藏：0 [点我收藏+]

标签：要求 scripts pack 写入 tostring cal ram tps path

最近线上出现了BUG，就是在服务器迁移之后，发现 nginx 的lua 脚本不能采集nginx的log数据

经过排查发现是因为 lua 不能找到对应文件，所以不能将nginx 数据写入文件中。即 lua 不能创建创建文件目录，因此找不到文件。

明明服务器未迁移之前好好的，怎么迁移重启之后就报错了？这块是离职同事写的，那时候比较忙交接的时候也没有怎么认真看。坑啊！

重现步骤

启动nginx /usr/servers/nginx/sbin/nginx nginx 配置

user  nginx;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    lua_package_path "/usr/local/servers/lualib/?.lua;;";  
    lua_package_cpath "/usr/local/servers/lualib/?.so;;"; 


    #log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘
    #                  ‘$status $body_bytes_sent "$http_referer" ‘
    #                  ‘"$http_user_agent" "$http_x_forwarded_for"‘;

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    lua_shared_dict task 10m;
    lua_code_cache on;
    init_worker_by_lua_file conf/lua/task.lua;    

    server {
        listen       8001;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache‘s document root
        # concurs with nginx‘s one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }

  server {  
    listen       8181;  
    server_name  _;
    lua_code_cache on; 
  
    location /lua {  
      default_type ‘text/html‘; 
      content_by_lua_file conf/lua/test.lua; 
    }
   location /task {
      default_type ‘text/html‘;
      content_by_lua_file conf/lua/task.lua;
    } 
    location /flow/analysis { 
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto http;
 
      default_type ‘text/html‘; 
      content_by_lua_file conf/lua/analysis.lua; 
    }
  }  


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

test.lua 内容

local osTime = os.time()
local osTimeNum = (tonumber(osTime)+86400)
local utcPath = tostring(os.date("%Y-%m",osTimeNum))
ngx.say("hello world4mkdir-----------:"..utcPath);
os.execute("mkdir test")

测试 localhost:8181/lua 我需要的要求是在 nginx 的根目录下: /usr/servers/nginx 创建目录 test 结果发现并没有，而是在 /usr/servers/nginx/sbin 下面创建了目录 test 并不是我想要的。

解决办法

创建文件夹使用绝对路径

os.execute("mkdir /usr/servers/nginx/test") 通过测试没有问题了

为什么会这样？ lua 的默认目录又是怎么回事？

为什么会这样？没有迁移之前怎么没有问题？我怀疑是离职同事的启动命名和我的不一样导致的。可是又找不出来在通过查询资源之后，测试之后终于发现了是哪里的问题了技术图片 **即通过 -p 命名指定nginx根目录，那么 lua 就默认以这个为根目录 /usr/servers/nginx/sbin/nginx -p pwd/ -c conf/nginx.conf **