perl: warning: Falling back to the standard locale ("C").

/**********************************************************************************
 *          perl: warning: Falling back to the standard locale ("C").
 * 说明：
 *     使用debootstrap的时候，遇到这个问题，记录解决方法。
 *
 *                                          2017-2-18 深圳 南山平山村 曾剑锋
 *********************************************************************************/

一、参考文档：
    . How to fix a locale setting warning from Perl?
        http://stackoverflow.com/questions/2499794/how-to-fix-a-locale-setting-warning-from-perl

二、原因：
If you are creating a rootfs using debootstrap you will need to generate the locales. You can do this by running:
    sudo locale-gen en_US.UTF-
This tip comes from, https://help.ubuntu.com/community/Xen
On Debian you may need to do $ echo en_US UTF- >> /etc/locale.gen first.

三、处理方法：
    root@zengjf:# echo en_US UTF- >> /etc/locale.gen
    root@zengjf:# locale-gen en_US.UTF-
    Generating locales (this might take a while)...
      en_US.UTF-... done
      Generation complete.
    root@zengjf:#