1、問題現(xiàn)象

VI編輯后 Acess、Modify、Change和Birth Time都會變

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其原因是 vi后，文件的inode會發(fā)生變化

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這種情況如果發(fā)生在日志文件上，就會出現(xiàn)新日志不會記錄到日志文件，而且日志空間還會繼續(xù)上漲

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2、inode為什么會變？

缺省情況下，backupcopy=auto，一般是no，也就是會寫一個新文件

'backupcopy' 'bkc'      string  (Vi default for Unix: "yes", otherwise: "auto")
                        global or local to buffer |global-local|
                        {not in Vi}
        When writing a file and a backup is made, this option tells how it's
        done.  This is a comma separated list of words.

        The main values are:
        "yes"   make a copy of the file and overwrite the original one
        "no"    rename the file and write a new one
        "auto"  one of the previous, what works best

        Extra values that can be combined with the ones above are:
        "breaksymlink"  always break symlinks when writing
        "breakhardlink" always break hardlinks when writing

3、如何讓inode不變

• 在vi中設(shè)置 :set backupcopy=yes
• 在vimrc (全局或者文件中設(shè)置)
• 給文件創(chuàng)建硬鏈接

4、已經(jīng)vi編輯過的日志如何找回

• 通過cp /proc/xxxx/fd/xxxx xxx 找回丟失的日志
• 找回后重啟應(yīng)用，日志會定位到新的文件