Day: May 12, 2009

  • Bkf is not found is not true

    When I tried to restore from bkf file created by Windows in-built System Tool Backup and Restore, I was not aware another colleague was accessing (read access) this file. At the last page of Restore wizard, it threw an error with a nonsense error message – “(the file name).bkf Disk 1 is not found”. The error message scared me because this bkf file is my only backup file I have. I do not have any other file like Disk 1, Disk 2. If this file is corrupted, nothing else I can fallback.

    I was released when I retried after my colleague finishing reading the file. Everything successfully restored when I had exclusive access to the bkf file.

    我早该想到 Windows 的错误提示往往不是它字面的意思。

    早就想用 Linux 的备份工具,但是很惭愧,还没熟练掌握,所以重要的备份还是在 Windows 下完成。

  • My understanding to Nginx so far

    Location directive 没有fallback 机制。因为一个 request 只能匹配一个 location,不是常规 location 的话,就是正则表达式 location。假如有两个 location blocks,
    location / {
    index index.php;
    }

    location /abc {
    client_max_body_size 32m;
    }

    请别指望 index index.php  会在location /abc 生效。因为这是两个 location,只能有一个生效,另一个被忽略。

    正则表达式 location 优先于常规 location 匹配(除非常规 location 使用 ^~ 或 =);常规 location 之间最长匹配优先;正则表达式 location 之间位置在前优先。

    Nginx wiki 文档里关于 location 用到的 “searching stops” 这个词很不恰当,挺误导初学者的思维,让人误以为会有两个或两个以上 location同时生效。

    正则表达式 location 以 ~ 或 ~* 开头,其他的都是常规 location (以 ^~ 开头的貌似正则表达式 location,却是常规 location)。

    Root directive 和 alias directive 用处类似,只是 alias 不改变 document root。但是,它们对文件的定位方式明显不同。例:
    如配置文件使用 root –
    server {
    server_name _;
    root /default/path;

    location /abc {
    root /another/path;
    }
    }
    Request to /abc/filename.jpg 将对应 /anther/path/abc/filename.jpg。
    如配置文件使用 alias –
    server {
    server_name _;
    root /default/path;

    location /abc {
    alias /another/path;
    }
    }
    Request to /abc/filename.jpg 将对应 /anther/path/filename.jpg。

    以上是我用我的语言的去理解 Nginx 的语法。